2212A II/212A A Finding List of Faint UV-Bright Stars H H Lanning Publ. Astron. Soc. Pac. 85 70 1973 1973PASP...85...70L H H Lanning M Meakes Publ. Astron. Soc. Pac. 106 38 1994 1994PASP..106...38L H H Lanning M Meakes Publ. Astron. Soc. Pac. 107 751 1995 1995PASP..107..751L H H Lanning M Meakes Publ. Astron. Soc. Pac. 110 586 1998 1998PASP..110..586L Galactic plane Photometry, UBV Surveys Ultraviolet 195 UV-bright stars have been found on two-color 48-inch Schmidt plates centered on the galactic plane, and on one high-latitude plate. This catalog contains sources with (U-B) in the range U-B=0 to U-B=-1.5.

The Sandage two-color photographic survey was originally made in support of the UHURU x-ray satellite in order to identify those optical counterparts of the detected x-ray sources found in the galactic plane. During inspection of the plates, however, many UV-bright objects fainter than 10th magnitude were seen in the general field. A larger image in the U filter suggested the possibility of a bluer object as in the case of low-luminosity stars, white dwarfs, novae, CVs, normal early B stars, etc. As these are interesting in themselves, it was decided to publish a catalog for the use of other observers. This multi-color photographic technique has been described, for example, by Haro and Herbig (1955). The survey was concentrated on objects with m(B)~10 or fainter. It employed the Palomar 48-in (Oschin) Schmidt telescope and was centered on the galactic plane with overlapping regions covering the galactic latitudes +- 9 degrees, and extending throughout most of the northern plane (l = 0 deg - 227 deg). Plates were taken by J. Kristian, A.R. Sandage, R.J. Brucato, and Lanning, primarily. The data presented here were found following a careful examination of the plates but it should not be assumed these data represent a complete survey of the fields examined. The categories were roughly calibrated against photoelectric (U-B) measures, but a full scale calibration program, including magnitude effects, etc. was not done. The numerical (U-B) limits of the tables should not therefore be taken precisely. The blue magnitude of the sources in the finding list has been estimated using these photoelectric values as a guide but should be considered accurate to only +- 0.5 mag. due to the difficulty of adjusting to the various plate characteristics. Positions were measured from images retrieved from the Space Telescope Science Institute collection of Guide Star digital plate scans. The accuracy of positions from the Guide Star Catalog images has been estimated to be on the order of 0.2-0.8 arcsec (Russell et al. 1990) Information provided by Bidelman (private communication) resulted in the discovery that 15 positions for objects listed in Paper II were in error. Investigation indicated that an incorrect header was associated with the scan of the Guide Star plate originally archived onto optical disk. The incorrect astrometric solution, based on the use of an incorrect origin point, was subsequently applied in the positional determination when centroiding the object. The average offset for positions in right ascension is 14.17 seconds of time, with no detectable trend in the numbers. The offsets in declination range from +6.56 arcseconds through zero to -6.85 arcseconds as one progresses from west to east across the plate. This is consistent with a rotation being introduced into the bad plate solution. Objects with incorrect positions included Lanning 96, 97, 98, 99, 100, 102, 104, 108, 111, 113, 114, 115, 116, 119, and 122. uv.dat contains the corrected coordinates.

ID Lanning number --- rem "*" indicates a note in notes.dat --- RAh Hours of Right Ascension (J2000) h RAm Minutes of Right Ascension (J2000) min RAs Seconds of Right Ascension (J2000) s DE- Sign of declination --- DEd Degrees of declination (J2000) deg DEm Minutes of declination (J2000) arcmin DEs Seconds of declination (J2000) arcsec Bmag Approximate blue magnitude mag u_Bmag : indicates B is uncertain --- U-B Approximate U-B mag u_U-B : indicates U-B is uncertain --- ID Lanning number The Lanning number is repeated when the text is longer than 75 characters. --- Text Text of Note --- N. G. Roman ADC/SSDOO 1997Feb10The original author would like to thank Dr. R. J. Brucato for his assistance in the examination of some of the photographic plates for this two-color survey. Lanning and Meakes are very grateful to Dr. Peter Pesch for providing information regarding his unpublished observations of the high latitude sources noted in the text. They give special thanks to Dr. Allan Sandage for the opportunity to continue this survey. They also extend a special thanks to Dr. W. P. Bidelman who provided useful comments and information regarding the sources. They also greatly appreciate the ground-based observations taken by Dr. Alan Shafter (SDSU) and IUE data obtained by Dr. Al Schultz (CSC/STScI) in clarifying the classification of Lanning 185. The undersigned thanks Dr. Lanning for his help and particularly for a careful review of the finished files. UNKNOWN UNKNOWN * 10-Feb-1997: Papers I, II and III (Lanning numbers 1-195) * 07-Aug-1998: Paper IV appended (Lanning numbers 196-351) at CDS II_212A.xml