J/A+AS/104/557 J/A+AS/104/557 uvby-beta photometry in star-forming regions L Terranegra C Chavarria-K S Diaz D Gonzalez-Patino Astron. Astrophys. Suppl. Ser. 104 557 1994 1994A&AS..104..557T dust, extinction stars: emission-line, Be stars: pre-main sequence Homogeneous uvby{beta} photometry of 150 stars associated with the star forming regions Taurus-Auriga, Orion, Canis Mayoris, Ophiuchus, Serpens and Cygnus, is presented here. We also present uvby{beta} photometry of 10 Herbig Ae/Be stars not belonging to the specific regions studied here. Using the (V,b-y), ({beta},[m1]), ([c1],[m1]) and ([u-b], T_eff_) diagrams we study the photometric properties of the sample. The effects of duplicity, stellar rotation, and interstellar extinction on the location in the magnitude-color and color-color diagrams of our program stars are briefly investigated. We derive reliable photometric spectral types and discuss membership to the regions and to the Orion population, as well as peculiarities of the individual stars. We also find new B stars associated with the CMa R1 star forming region and new intermediate-low mass PMS members associated with the BD+404124/BD+413731 region. The FU-Orionis stars Z CMa, V1515 Cyg and V1057 Cyg have a peculiar position in the reddening free ({beta},[m1]) diagram. With diagrams such as (V-M _v_-5 log r+5) vs. E(b-y), E(c1) vs. E(b-y), E(m1) vs. E(b-y) and E(u-b) vs. E(b-y) we investigate the IS extinction law towards the star-forming regions. We find that the total to selective extinction ratio to these regions is steeper than normal with R_y_=5.4 (R_v_=4.0) and the coefficients E(c1)/E(b-y) and E(m1)/E(b-y) used to define the reddening free indices [c1] and [m1] should be numerically smaller than the generally adopted values.

Group Group number number=1 See note (1) for table3b --- Name Star name --- Sp Photometric spectral type --- Note Note --- Vmag V magnitude mag e_Vmag rms uncertainty on V mag (b-y) (b-y) index mag e_(b-y) rms uncertainty on (b-y) mag c1 c1 index mag e_c1 rms uncertainty on c1 mag m1 m1 index mag e_m1 rms uncertainty on m1 mag beta beta index mag n_beta When *, the stars was not observed in Beta index --- e_beta rms uncertainty on Beta mag Nobs Number of observations --- Group Group number number=1 1 = Taurus-Auriga 2 = Orion 3 = CMa R1 4 = NGC 6611 5 = Ophiuchus 6 = BD+40 4124 and BD+41 3731 groups 7 = NGC 7000/IC 5070 8 = Miscellaneous stars 9 = Miscellaneous Herbig Ae/Be stars --- Name Star name --- RAh Right ascension 1950 h RAm Right ascension 1950 min RAs Right ascension 1950 s DE- Declination sign --- DEd Declination 1950 deg DEm Declination 1950 arcmin DEs Declination 1950 arcsec Sp Photometric spectral type --- Vmag V magnitude mag (b-y) (b-y) index mag c1 c1 index mag m1 m1 index mag beta beta index mag JDhel Heliocentric Julian day d Patricia Bauer, Francois Ochsenbein CDS 1995Jul07 UNKNOWN UNKNOWN * 18-Feb-1994: first prepared * 07-Jul-1995: replaced 2440000-offset dates by complete ones J_A+AS_104_557.xml