2059B II/59B Catalogue of stellar UV fluxes G I Thompson K Nandy C Jamar A Monfils L Houziaux D J Carnochan R Wilson The Science Research Council, U.K. ??? ??? 1978 1978QB6.C389....... III/39 : UV Bright Star Spectrophotometric Catalog (Jamar et al., 1976) II/86 : Supplement to the UVBS Photometric Catalogue Boksenberg A., Evans R.G., Fowler R.G., Gardner I.S.K., Houziaux L., Humphries C.M., Jamar C., Macau D., Malaise D., Monfils A., Nandy K., Thompson G.I., Wilson R., Wroe H., =1973MNRAS.163..291B Haynes D.S., Latham D.W., =1975ApJ...197..593H Humphries C.M., Jamar C., Malaise D., Wroe H., =1976A&A....49..389H Jamar C., Macau-Hercot D., Monfils A., Thompson G.I., Houziaux L., Wilson R., 1976, "Ultraviolet Bright Star Spectrophotometric Catalogue", ESA Special Report 27 (Cat. <III/39>) Thompson G.I., Nandy K., Jamar C., Monfils A., Houziaux L., Carnochan A., Wilson R., =1979BICDS..17...78T Photometry, ultraviolet (adapted from ADC documentation EAC-T-5294-0028): The Belgian/UK Ultraviolet Sky Survey Telescope (S2/68) in the ESRO TD1 satellite carried out a controlled scan of the whole sky. It measured the absolute ultraviolet flux distribution between 2740A (274nm) and 1350A (135nm) of point sources down to tenth visual magnitude for unreddened early B stars. The S2/68 experiment has been described by Boksenberg et al. (=1973MNRAS.163..291B) and the absolute calibration by Humphries et al. (=1976A&A....49..389H). The catalog contains results from the sky-scan experiment in the TD1 satellite of the European Space Research Organization. The catalog lists the absolute ultraviolet fluxes in four passbands: --------------------------------------------------------- Passband Center: 274.0nm 236.5nm 196.5nm 156.5nm Effective Width: 31.0 33.0 33.0 33.0 --------------------------------------------------------- for 31215 stars. The stars have been selected subject to the constraint that the signal-to-noise ratio should be at least 10.0 in any one of the four passbands. Many of the fainter stars of spectral types later than A5 do not have significant signals in all of the spectrophotometric channels (particularly the 1565A channel). Consequently, after the removal of the background, they can randomly give rise to small negative values of flux. We have decided not to suppress these negative values but to give them together with their error as they can be significant when considered as part of a statistical sample. Although the sky coverage is essentially complete, the catalogue does not contain the fluxes for all stars that fall within the limit of the sensitivity of the instrument. If any star expected to be present is missing, then its signal is probably blended with that of a nearby star in which case the data have been discarded. The fluxes F(lambda), and errors, sigma(lambda), can be transformed to the visual magnitude scale using the absolute calibration of Haynes & Latham (=1975ApJ...197..593H): m(lambda) = -2.5 log10 F(lambda) - 21.175 sigma_m(lambda) = 1.086 sigma(lambda)/F(lambda) Also: F(nu) = 3.336x10^-19^ lambda^2 F(lambda) m(nu) = -2.5 log10 F(lambda) - 5 log10 lambda - 18.724 sigma_m(nu) = 1.086 sigma(lambda)/F(lambda) where F(lambda) is in units of erg.cm^-2^.s^-1^.A^-1^ (mW/m2/(0.1nm)) lambda is in Angstroms and F(nu) is in units of erg.cm^-2^.s^-1^.Hz^-1^ (mW/m2/Hz = 10^23^Jy)

TD 1A

TD1 Catalog running number --- HD Henry Draper Catalog number --- UVBSflag '1' if in UVBS Catalog (Jamar et al. 1976) (=III/39A) --- DM Durchmusterung (BD/CD/CPD) designation, as CCsZZNNNNN (catalog, sign, zone number) --- S2/68 S2/68 Catalog Number --- Vmag Visual magnitude mag SpType Spectral type --- RArad Right ascension, 1950.0, in radians rad DErad Declination, 1950.0, in radians rad F2740 =-10.00 Flux in 2740A band (see Exp) 10mW/m2/nm e_F2740 =-1.00 Standard error for F2740 (see Exp) 10mW/m2/nm F2365 =-10.00 Flux in 2365A band (see Exp) 10mW/m2/nm e_F2365 =-1.00 Standard error for F2365 (see Exp) number=1 a few records with standard errors in F2365 and F1965 larger than 100.00 were assigned a value of '99.99'. This occured in records (TD1 numbers): ----------------------------------- TD1 HD Band Error ----------------------------------- 639 6676 1965 133.70 14977 91979 1965 110.22 17270 123445 1965 114.56 18199 137058 2365 119.69 18199 137058 1965 213.83 ----------------------------------- In reference to these specific figures, G. I. Thompson remarks in a private communication: "...the formal computed error has turned out to be so large that the result is probably worthless anyway." 10mW/m2/nm F1965 =-10.00 Flux in 1965A band (see Exp) 10mW/m2/nm e_F1965 =-1.00 Standard error for F1965 (see Exp) number=1 a few records with standard errors in F2365 and F1965 larger than 100.00 were assigned a value of '99.99'. This occured in records (TD1 numbers): ----------------------------------- TD1 HD Band Error ----------------------------------- 639 6676 1965 133.70 14977 91979 1965 110.22 17270 123445 1965 114.56 18199 137058 2365 119.69 18199 137058 1965 213.83 ----------------------------------- In reference to these specific figures, G. I. Thompson remarks in a private communication: "...the formal computed error has turned out to be so large that the result is probably worthless anyway." 10mW/m2/nm F1565 =-10.00 Flux in 1565A band (see Exp) 10mW/m2/nm e_F1565 =-1.00 Standard error for F1565 (see Exp) 10mW/m2/nm Exp 10-base exponent for all Fluxes, e.g. Flux(2740) = 10^Exp^ x F2740 --- Francois Ochsenbein CDS 1995Oct24 UNKNOWN UNKNOWN * from ADC Documentation (EAC-T-5294-0028) by Robert S. Hill and Theresa A. Nagy (1981), revised April 1991 by Susan E. Gessner and Lee E. Brotzman, NASA/GSFC: The "Catalogue of Stellar Ultraviolet Fluxes", which represents results from the sky-scan experiment in the TD1 satellite of the European Space Research Organization (ESRO), was received from Dr. G. I. Thompson of the Royal Observatory, Edinburgh, Scotland. The present documentation is mostly a rearrangement of material provided by Dr. Thompson. The tape as received was edited at GSFC as follows: five standard-error values represented by asterisk-filled fields were changed to 99.99. The actual values as given in the hard copy version of the catalogue are given in the "Byte-by-Byte description" above. Some of the pertinent statistics for the data on this tape have been determined. The number of entries which have no valid data for the star as a function of wavelength are: -------------------------- Lamda (A) Entries -------------------------- 2740 5 2365 752 1965 747 1565 735 -------------------------- and, the number of entries that have small negative flux values as a function of wavelength are: -------------------------- Lamda (A) Entries -------------------------- 2740 8 2365 97 1965 154 1565 3392 -------------------------- The catalog was again revised in April 1991. Two byte catalog designations were added to the Durchmusterung numbers. During this process, Dr. Nancy Roman discovered that several of the values given in the original catalogue for the right ascension field (bytes 40-48) were in error. These values were corrected by subtracting 0.0043633 from the original value. The records in which this change occured are: 8703 9546 21996 9322 9671 31105 9509 10112 31139 9414 21723 * October 1991: "Selected Astronomical Catalogs" Vol. 1 CD-ROM, directory /photom/td1 * 24-Oct-1995: Documentation file added at CDS (F. Ochsenbein, J. Florsch) II_59B.xml