J/A+AS/121/57 J/A+AS/121/57 Ap stars periodicity F A Catalano P Renson Astron. Astrophys. Suppl. Ser. 121 57 1997 1997A&AS..121...57C III/152 : Catalogue of observed periods of Ap stars (Catalano+ 1984) (An updated version is in preparation) Catalano & Renson, 1984, A&AS 55, 371 (Catalogue) =Catalogue <III/152> Catalano & Renson, 1988, A&AS 72, 1 (First suppl.) =1988A&AS...72....1C Catalano et al., 1991, A&AS 87, 59 (Second suppl.) =1991A&AS...87...59C Catalano et al., 1993, A&AS 98, 269 (Third suppl.) =1993A&AS...98..269C Stars, Ap catalogs stars: chemically peculiar stars: variables: other New data on the periods of Ap stars with references are presented (Table 1). 21 further stars are introduced for which a periodic variability has recently been discovered or for which it was known before but it was not reported in previous issues of this catalogue. For many stars also present in previous issues of the catalogue new determinations of the periods are given. Recently attributed variable star names are also quoted.

n_HD A '+' indicates a note number=1 + indicates stars which appear for the first time ** indicates a new or modified note (see note 1) * indicates stars which have a note in the preceding version with no changes (Catalano et al. 1984, 1988, 1991, 1993) --- HD HD number number= [HD 36485]: ADS 4134C: the brighter component HD 36486 ({delta} Ori A = HR 1852, V = 2.23) 52" away, and a fainter component (ADS 4134B, V = 14) 33" away from A, are not physically related to HD 36485; HD 36485 is also a spectroscopic binary with P = 9.9144+/-0.0002d (Morrell & Levato 1991) [HD 37017]: sp. bin. P = 18.6217+/-0.0004 d (Morrell & Levato 1991) [HD 37479]: first helium-strong star in which a large magnetic field has been detected. Light variations are mainly due to the eclipse by a ring or cloud of circumstellar material (Groote & Hunger 1982) [HD 47152]: interf. bin. P = 25.8 years (Baize 1989) [HD 84041]: rapid oscillating Ap star with periods near 15 min; also visual double: fainter component (V = 13) at 8" [HD 116458]: sp. bin. P = 126 d [HD 143654]: according to the quoted authors, this star is probably not an Ap star [HD 144667]: component A (V = 6.64) of a quadruple system; companion B (V~13) at 16"; companion C (HD 144668 = HR 5999 = V856 Sco, irregular variable, Sp. A7IIIe, V ~ 7.0) at 44"; companion D (V ~ 11.6) at 1.3" from C [HD 165474]: ADS 11056B, component A at 7", {DELTA}m = 0.5; component C at 56" is 5 mag. fainter than A [HD 171247]: ADS 11448A, companion at 38.7", {DELTA}m = 4 [HD 180583]: this star is probably not to be considered as an Ap star, but it is a known cepheid, as it has been noted in the General Catalogue of Ap and Am Stars, its luminosity class being I or II [HD 191495]: star of the open cluster NGC 6871, in the association Cyg OB3 [HDE 335238]: (= Rns 55280): coordinates at the epoch 1950.0: 20^h^ 48.6^m^ +29^o^ 37' [Gr.9-NGC 2169]: (= Rns 11180): star N.9 in NGC 2169 (Grubissich 1959); the identification as star N.12 in Hoag et al. (1961) has also been used. Coordinates at the epoch 1950.0: 06h 05.6m, +13deg57' --- HR HR number number= [HD 36485]: ADS 4134C: the brighter component HD 36486 ({delta} Ori A = HR 1852, V = 2.23) 52" away, and a fainter component (ADS 4134B, V = 14) 33" away from A, are not physically related to HD 36485; HD 36485 is also a spectroscopic binary with P = 9.9144+/-0.0002d (Morrell & Levato 1991) [HD 37017]: sp. bin. P = 18.6217+/-0.0004 d (Morrell & Levato 1991) [HD 37479]: first helium-strong star in which a large magnetic field has been detected. Light variations are mainly due to the eclipse by a ring or cloud of circumstellar material (Groote & Hunger 1982) [HD 47152]: interf. bin. P = 25.8 years (Baize 1989) [HD 84041]: rapid oscillating Ap star with periods near 15 min; also visual double: fainter component (V = 13) at 8" [HD 116458]: sp. bin. P = 126 d [HD 143654]: according to the quoted authors, this star is probably not an Ap star [HD 144667]: component A (V = 6.64) of a quadruple system; companion B (V~13) at 16"; companion C (HD 144668 = HR 5999 = V856 Sco, irregular variable, Sp. A7IIIe, V ~ 7.0) at 44"; companion D (V ~ 11.6) at 1.3" from C [HD 165474]: ADS 11056B, component A at 7", {DELTA}m = 0.5; component C at 56" is 5 mag. fainter than A [HD 171247]: ADS 11448A, companion at 38.7", {DELTA}m = 4 [HD 180583]: this star is probably not to be considered as an Ap star, but it is a known cepheid, as it has been noted in the General Catalogue of Ap and Am Stars, its luminosity class being I or II [HD 191495]: star of the open cluster NGC 6871, in the association Cyg OB3 [HDE 335238]: (= Rns 55280): coordinates at the epoch 1950.0: 20^h^ 48.6^m^ +29^o^ 37' [Gr.9-NGC 2169]: (= Rns 11180): star N.9 in NGC 2169 (Grubissich 1959); the identification as star N.12 in Hoag et al. (1961) has also been used. Coordinates at the epoch 1950.0: 06h 05.6m, +13deg57' --- n_HR Note on HR number=1 + indicates stars which appear for the first time ** indicates a new or modified note (see note 1) * indicates stars which have a note in the preceding version with no changes (Catalano et al. 1984, 1988, 1991, 1993) --- Name Other name number= [HD 36485]: ADS 4134C: the brighter component HD 36486 ({delta} Ori A = HR 1852, V = 2.23) 52" away, and a fainter component (ADS 4134B, V = 14) 33" away from A, are not physically related to HD 36485; HD 36485 is also a spectroscopic binary with P = 9.9144+/-0.0002d (Morrell & Levato 1991) [HD 37017]: sp. bin. P = 18.6217+/-0.0004 d (Morrell & Levato 1991) [HD 37479]: first helium-strong star in which a large magnetic field has been detected. Light variations are mainly due to the eclipse by a ring or cloud of circumstellar material (Groote & Hunger 1982) [HD 47152]: interf. bin. P = 25.8 years (Baize 1989) [HD 84041]: rapid oscillating Ap star with periods near 15 min; also visual double: fainter component (V = 13) at 8" [HD 116458]: sp. bin. P = 126 d [HD 143654]: according to the quoted authors, this star is probably not an Ap star [HD 144667]: component A (V = 6.64) of a quadruple system; companion B (V~13) at 16"; companion C (HD 144668 = HR 5999 = V856 Sco, irregular variable, Sp. A7IIIe, V ~ 7.0) at 44"; companion D (V ~ 11.6) at 1.3" from C [HD 165474]: ADS 11056B, component A at 7", {DELTA}m = 0.5; component C at 56" is 5 mag. fainter than A [HD 171247]: ADS 11448A, companion at 38.7", {DELTA}m = 4 [HD 180583]: this star is probably not to be considered as an Ap star, but it is a known cepheid, as it has been noted in the General Catalogue of Ap and Am Stars, its luminosity class being I or II [HD 191495]: star of the open cluster NGC 6871, in the association Cyg OB3 [HDE 335238]: (= Rns 55280): coordinates at the epoch 1950.0: 20^h^ 48.6^m^ +29^o^ 37' [Gr.9-NGC 2169]: (= Rns 11180): star N.9 in NGC 2169 (Grubissich 1959); the identification as star N.12 in Hoag et al. (1961) has also been used. Coordinates at the epoch 1950.0: 06h 05.6m, +13deg57' --- Name2 Other name number= [HD 36485]: ADS 4134C: the brighter component HD 36486 ({delta} Ori A = HR 1852, V = 2.23) 52" away, and a fainter component (ADS 4134B, V = 14) 33" away from A, are not physically related to HD 36485; HD 36485 is also a spectroscopic binary with P = 9.9144+/-0.0002d (Morrell & Levato 1991) [HD 37017]: sp. bin. P = 18.6217+/-0.0004 d (Morrell & Levato 1991) [HD 37479]: first helium-strong star in which a large magnetic field has been detected. Light variations are mainly due to the eclipse by a ring or cloud of circumstellar material (Groote & Hunger 1982) [HD 47152]: interf. bin. P = 25.8 years (Baize 1989) [HD 84041]: rapid oscillating Ap star with periods near 15 min; also visual double: fainter component (V = 13) at 8" [HD 116458]: sp. bin. P = 126 d [HD 143654]: according to the quoted authors, this star is probably not an Ap star [HD 144667]: component A (V = 6.64) of a quadruple system; companion B (V~13) at 16"; companion C (HD 144668 = HR 5999 = V856 Sco, irregular variable, Sp. A7IIIe, V ~ 7.0) at 44"; companion D (V ~ 11.6) at 1.3" from C [HD 165474]: ADS 11056B, component A at 7", {DELTA}m = 0.5; component C at 56" is 5 mag. fainter than A [HD 171247]: ADS 11448A, companion at 38.7", {DELTA}m = 4 [HD 180583]: this star is probably not to be considered as an Ap star, but it is a known cepheid, as it has been noted in the General Catalogue of Ap and Am Stars, its luminosity class being I or II [HD 191495]: star of the open cluster NGC 6871, in the association Cyg OB3 [HDE 335238]: (= Rns 55280): coordinates at the epoch 1950.0: 20^h^ 48.6^m^ +29^o^ 37' [Gr.9-NGC 2169]: (= Rns 11180): star N.9 in NGC 2169 (Grubissich 1959); the identification as star N.12 in Hoag et al. (1961) has also been used. Coordinates at the epoch 1950.0: 06h 05.6m, +13deg57' --- Sp Spectral type number= [HD 36485]: ADS 4134C: the brighter component HD 36486 ({delta} Ori A = HR 1852, V = 2.23) 52" away, and a fainter component (ADS 4134B, V = 14) 33" away from A, are not physically related to HD 36485; HD 36485 is also a spectroscopic binary with P = 9.9144+/-0.0002d (Morrell & Levato 1991) [HD 37017]: sp. bin. P = 18.6217+/-0.0004 d (Morrell & Levato 1991) [HD 37479]: first helium-strong star in which a large magnetic field has been detected. Light variations are mainly due to the eclipse by a ring or cloud of circumstellar material (Groote & Hunger 1982) [HD 47152]: interf. bin. P = 25.8 years (Baize 1989) [HD 84041]: rapid oscillating Ap star with periods near 15 min; also visual double: fainter component (V = 13) at 8" [HD 116458]: sp. bin. P = 126 d [HD 143654]: according to the quoted authors, this star is probably not an Ap star [HD 144667]: component A (V = 6.64) of a quadruple system; companion B (V~13) at 16"; companion C (HD 144668 = HR 5999 = V856 Sco, irregular variable, Sp. A7IIIe, V ~ 7.0) at 44"; companion D (V ~ 11.6) at 1.3" from C [HD 165474]: ADS 11056B, component A at 7", {DELTA}m = 0.5; component C at 56" is 5 mag. fainter than A [HD 171247]: ADS 11448A, companion at 38.7", {DELTA}m = 4 [HD 180583]: this star is probably not to be considered as an Ap star, but it is a known cepheid, as it has been noted in the General Catalogue of Ap and Am Stars, its luminosity class being I or II [HD 191495]: star of the open cluster NGC 6871, in the association Cyg OB3 [HDE 335238]: (= Rns 55280): coordinates at the epoch 1950.0: 20^h^ 48.6^m^ +29^o^ 37' [Gr.9-NGC 2169]: (= Rns 11180): star N.9 in NGC 2169 (Grubissich 1959); the identification as star N.12 in Hoag et al. (1961) has also been used. Coordinates at the epoch 1950.0: 06h 05.6m, +13deg57' --- Per Period number= [HD 36485]: ADS 4134C: the brighter component HD 36486 ({delta} Ori A = HR 1852, V = 2.23) 52" away, and a fainter component (ADS 4134B, V = 14) 33" away from A, are not physically related to HD 36485; HD 36485 is also a spectroscopic binary with P = 9.9144+/-0.0002d (Morrell & Levato 1991) [HD 37017]: sp. bin. P = 18.6217+/-0.0004 d (Morrell & Levato 1991) [HD 37479]: first helium-strong star in which a large magnetic field has been detected. Light variations are mainly due to the eclipse by a ring or cloud of circumstellar material (Groote & Hunger 1982) [HD 47152]: interf. bin. P = 25.8 years (Baize 1989) [HD 84041]: rapid oscillating Ap star with periods near 15 min; also visual double: fainter component (V = 13) at 8" [HD 116458]: sp. bin. P = 126 d [HD 143654]: according to the quoted authors, this star is probably not an Ap star [HD 144667]: component A (V = 6.64) of a quadruple system; companion B (V~13) at 16"; companion C (HD 144668 = HR 5999 = V856 Sco, irregular variable, Sp. A7IIIe, V ~ 7.0) at 44"; companion D (V ~ 11.6) at 1.3" from C [HD 165474]: ADS 11056B, component A at 7", {DELTA}m = 0.5; component C at 56" is 5 mag. fainter than A [HD 171247]: ADS 11448A, companion at 38.7", {DELTA}m = 4 [HD 180583]: this star is probably not to be considered as an Ap star, but it is a known cepheid, as it has been noted in the General Catalogue of Ap and Am Stars, its luminosity class being I or II [HD 191495]: star of the open cluster NGC 6871, in the association Cyg OB3 [HDE 335238]: (= Rns 55280): coordinates at the epoch 1950.0: 20^h^ 48.6^m^ +29^o^ 37' [Gr.9-NGC 2169]: (= Rns 11180): star N.9 in NGC 2169 (Grubissich 1959); the identification as star N.12 in Hoag et al. (1961) has also been used. Coordinates at the epoch 1950.0: 06h 05.6m, +13deg57' d u_Per Uncertainty flag on Period number= [HD 36485]: ADS 4134C: the brighter component HD 36486 ({delta} Ori A = HR 1852, V = 2.23) 52" away, and a fainter component (ADS 4134B, V = 14) 33" away from A, are not physically related to HD 36485; HD 36485 is also a spectroscopic binary with P = 9.9144+/-0.0002d (Morrell & Levato 1991) [HD 37017]: sp. bin. P = 18.6217+/-0.0004 d (Morrell & Levato 1991) [HD 37479]: first helium-strong star in which a large magnetic field has been detected. Light variations are mainly due to the eclipse by a ring or cloud of circumstellar material (Groote & Hunger 1982) [HD 47152]: interf. bin. P = 25.8 years (Baize 1989) [HD 84041]: rapid oscillating Ap star with periods near 15 min; also visual double: fainter component (V = 13) at 8" [HD 116458]: sp. bin. P = 126 d [HD 143654]: according to the quoted authors, this star is probably not an Ap star [HD 144667]: component A (V = 6.64) of a quadruple system; companion B (V~13) at 16"; companion C (HD 144668 = HR 5999 = V856 Sco, irregular variable, Sp. A7IIIe, V ~ 7.0) at 44"; companion D (V ~ 11.6) at 1.3" from C [HD 165474]: ADS 11056B, component A at 7", {DELTA}m = 0.5; component C at 56" is 5 mag. fainter than A [HD 171247]: ADS 11448A, companion at 38.7", {DELTA}m = 4 [HD 180583]: this star is probably not to be considered as an Ap star, but it is a known cepheid, as it has been noted in the General Catalogue of Ap and Am Stars, its luminosity class being I or II [HD 191495]: star of the open cluster NGC 6871, in the association Cyg OB3 [HDE 335238]: (= Rns 55280): coordinates at the epoch 1950.0: 20^h^ 48.6^m^ +29^o^ 37' [Gr.9-NGC 2169]: (= Rns 11180): star N.9 in NGC 2169 (Grubissich 1959); the identification as star N.12 in Hoag et al. (1961) has also been used. Coordinates at the epoch 1950.0: 06h 05.6m, +13deg57' --- n_Per Remark when no periodicity number=2 ':' period uncertain '?' period doubtful --- nPer Notes on Period number=3 'l' for luminosity and/or colour variations 'm' for magnetic field variations 's' for variations of intensity of certain spectral lines 'v' for variations of wavelength of certain spectral lines --- Per1 Proposed periodicities (in days) and references number= [HD 36485]: ADS 4134C: the brighter component HD 36486 ({delta} Ori A = HR 1852, V = 2.23) 52" away, and a fainter component (ADS 4134B, V = 14) 33" away from A, are not physically related to HD 36485; HD 36485 is also a spectroscopic binary with P = 9.9144+/-0.0002d (Morrell & Levato 1991) [HD 37017]: sp. bin. P = 18.6217+/-0.0004 d (Morrell & Levato 1991) [HD 37479]: first helium-strong star in which a large magnetic field has been detected. Light variations are mainly due to the eclipse by a ring or cloud of circumstellar material (Groote & Hunger 1982) [HD 47152]: interf. bin. P = 25.8 years (Baize 1989) [HD 84041]: rapid oscillating Ap star with periods near 15 min; also visual double: fainter component (V = 13) at 8" [HD 116458]: sp. bin. P = 126 d [HD 143654]: according to the quoted authors, this star is probably not an Ap star [HD 144667]: component A (V = 6.64) of a quadruple system; companion B (V~13) at 16"; companion C (HD 144668 = HR 5999 = V856 Sco, irregular variable, Sp. A7IIIe, V ~ 7.0) at 44"; companion D (V ~ 11.6) at 1.3" from C [HD 165474]: ADS 11056B, component A at 7", {DELTA}m = 0.5; component C at 56" is 5 mag. fainter than A [HD 171247]: ADS 11448A, companion at 38.7", {DELTA}m = 4 [HD 180583]: this star is probably not to be considered as an Ap star, but it is a known cepheid, as it has been noted in the General Catalogue of Ap and Am Stars, its luminosity class being I or II [HD 191495]: star of the open cluster NGC 6871, in the association Cyg OB3 [HDE 335238]: (= Rns 55280): coordinates at the epoch 1950.0: 20^h^ 48.6^m^ +29^o^ 37' [Gr.9-NGC 2169]: (= Rns 11180): star N.9 in NGC 2169 (Grubissich 1959); the identification as star N.12 in Hoag et al. (1961) has also been used. Coordinates at the epoch 1950.0: 06h 05.6m, +13deg57' --- Per2 Proposed periodicities (in days) and references number= [HD 36485]: ADS 4134C: the brighter component HD 36486 ({delta} Ori A = HR 1852, V = 2.23) 52" away, and a fainter component (ADS 4134B, V = 14) 33" away from A, are not physically related to HD 36485; HD 36485 is also a spectroscopic binary with P = 9.9144+/-0.0002d (Morrell & Levato 1991) [HD 37017]: sp. bin. P = 18.6217+/-0.0004 d (Morrell & Levato 1991) [HD 37479]: first helium-strong star in which a large magnetic field has been detected. Light variations are mainly due to the eclipse by a ring or cloud of circumstellar material (Groote & Hunger 1982) [HD 47152]: interf. bin. P = 25.8 years (Baize 1989) [HD 84041]: rapid oscillating Ap star with periods near 15 min; also visual double: fainter component (V = 13) at 8" [HD 116458]: sp. bin. P = 126 d [HD 143654]: according to the quoted authors, this star is probably not an Ap star [HD 144667]: component A (V = 6.64) of a quadruple system; companion B (V~13) at 16"; companion C (HD 144668 = HR 5999 = V856 Sco, irregular variable, Sp. A7IIIe, V ~ 7.0) at 44"; companion D (V ~ 11.6) at 1.3" from C [HD 165474]: ADS 11056B, component A at 7", {DELTA}m = 0.5; component C at 56" is 5 mag. fainter than A [HD 171247]: ADS 11448A, companion at 38.7", {DELTA}m = 4 [HD 180583]: this star is probably not to be considered as an Ap star, but it is a known cepheid, as it has been noted in the General Catalogue of Ap and Am Stars, its luminosity class being I or II [HD 191495]: star of the open cluster NGC 6871, in the association Cyg OB3 [HDE 335238]: (= Rns 55280): coordinates at the epoch 1950.0: 20^h^ 48.6^m^ +29^o^ 37' [Gr.9-NGC 2169]: (= Rns 11180): star N.9 in NGC 2169 (Grubissich 1959); the identification as star N.12 in Hoag et al. (1961) has also been used. Coordinates at the epoch 1950.0: 06h 05.6m, +13deg57' --- Per3 Proposed periodicities (in days) and references number= [HD 36485]: ADS 4134C: the brighter component HD 36486 ({delta} Ori A = HR 1852, V = 2.23) 52" away, and a fainter component (ADS 4134B, V = 14) 33" away from A, are not physically related to HD 36485; HD 36485 is also a spectroscopic binary with P = 9.9144+/-0.0002d (Morrell & Levato 1991) [HD 37017]: sp. bin. P = 18.6217+/-0.0004 d (Morrell & Levato 1991) [HD 37479]: first helium-strong star in which a large magnetic field has been detected. Light variations are mainly due to the eclipse by a ring or cloud of circumstellar material (Groote & Hunger 1982) [HD 47152]: interf. bin. P = 25.8 years (Baize 1989) [HD 84041]: rapid oscillating Ap star with periods near 15 min; also visual double: fainter component (V = 13) at 8" [HD 116458]: sp. bin. P = 126 d [HD 143654]: according to the quoted authors, this star is probably not an Ap star [HD 144667]: component A (V = 6.64) of a quadruple system; companion B (V~13) at 16"; companion C (HD 144668 = HR 5999 = V856 Sco, irregular variable, Sp. A7IIIe, V ~ 7.0) at 44"; companion D (V ~ 11.6) at 1.3" from C [HD 165474]: ADS 11056B, component A at 7", {DELTA}m = 0.5; component C at 56" is 5 mag. fainter than A [HD 171247]: ADS 11448A, companion at 38.7", {DELTA}m = 4 [HD 180583]: this star is probably not to be considered as an Ap star, but it is a known cepheid, as it has been noted in the General Catalogue of Ap and Am Stars, its luminosity class being I or II [HD 191495]: star of the open cluster NGC 6871, in the association Cyg OB3 [HDE 335238]: (= Rns 55280): coordinates at the epoch 1950.0: 20^h^ 48.6^m^ +29^o^ 37' [Gr.9-NGC 2169]: (= Rns 11180): star N.9 in NGC 2169 (Grubissich 1959); the identification as star N.12 in Hoag et al. (1961) has also been used. Coordinates at the epoch 1950.0: 06h 05.6m, +13deg57' --- Per4 Proposed periodicities (in days) and references number= [HD 36485]: ADS 4134C: the brighter component HD 36486 ({delta} Ori A = HR 1852, V = 2.23) 52" away, and a fainter component (ADS 4134B, V = 14) 33" away from A, are not physically related to HD 36485; HD 36485 is also a spectroscopic binary with P = 9.9144+/-0.0002d (Morrell & Levato 1991) [HD 37017]: sp. bin. P = 18.6217+/-0.0004 d (Morrell & Levato 1991) [HD 37479]: first helium-strong star in which a large magnetic field has been detected. Light variations are mainly due to the eclipse by a ring or cloud of circumstellar material (Groote & Hunger 1982) [HD 47152]: interf. bin. P = 25.8 years (Baize 1989) [HD 84041]: rapid oscillating Ap star with periods near 15 min; also visual double: fainter component (V = 13) at 8" [HD 116458]: sp. bin. P = 126 d [HD 143654]: according to the quoted authors, this star is probably not an Ap star [HD 144667]: component A (V = 6.64) of a quadruple system; companion B (V~13) at 16"; companion C (HD 144668 = HR 5999 = V856 Sco, irregular variable, Sp. A7IIIe, V ~ 7.0) at 44"; companion D (V ~ 11.6) at 1.3" from C [HD 165474]: ADS 11056B, component A at 7", {DELTA}m = 0.5; component C at 56" is 5 mag. fainter than A [HD 171247]: ADS 11448A, companion at 38.7", {DELTA}m = 4 [HD 180583]: this star is probably not to be considered as an Ap star, but it is a known cepheid, as it has been noted in the General Catalogue of Ap and Am Stars, its luminosity class being I or II [HD 191495]: star of the open cluster NGC 6871, in the association Cyg OB3 [HDE 335238]: (= Rns 55280): coordinates at the epoch 1950.0: 20^h^ 48.6^m^ +29^o^ 37' [Gr.9-NGC 2169]: (= Rns 11180): star N.9 in NGC 2169 (Grubissich 1959); the identification as star N.12 in Hoag et al. (1961) has also been used. Coordinates at the epoch 1950.0: 06h 05.6m, +13deg57' --- table1.texLaTeX version of table1 Patricia Bauer CDS 1996May28F. Catalano <FCATALANO@alpha4.ct.astro.it> J_A+AS_121_57.xml