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The Palomar-Green catalog of ultraviolet-excess stellar objects
667
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1986
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The Palomar‑Green Catalog of Ultraviolet‑Excess Stellar Objects presents positions, B‑magnitudes, spectral types, and available photometric colors for 1,874 UV‑excess stars. The catalog was compiled from 266 Palomar 18‑inch Schmidt fields, with magnitude calibration via photoelectric measurements and star‑count modeling, and its statistical completeness was assessed through internal and external tests, yielding limiting magnitudes around B = 16.1 mag. Of the 1,874 cataloged objects, 1,715 form a statistically complete sample covering 10,714 deg², with hot hydrogen‑atmosphere subdwarfs (sdB) comprising nearly 40 % and number‑count slopes of 2, 4, and 8 per magnitude for sdB, white dwarfs, and quasars, respectively, indicating a different spectral mix at 18th magnitude and suggesting sdB stars belong to the old disk. Published in ApJS (June 1986), DOI 10.1086/191115.
view Abstract Citations (920) References (63) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS The Palomar-Green Catalog of Ultraviolet-Excess Stellar Objects Green, R. F. ; Schmidt, M. ; Liebert, J. Abstract The Palomar-Green Catalog of Ultraviolet Excess Stellar Objects is presented, with data consisting of positions on the sky accurate to about 8 arcsec in each coordinate, photographic B-magnitudes accurate to 0.29 mag, spectral types, some cross references, and photoelectric broadband, multichannel, and Stromgren colors when available. Extensive discussion is given on magnitude calibration using a combination of photoelectric measurements and star count modeling, and on the statistical completeness of the sample based on internal and external tests. Of the 1874 objects in the catalog, 1715 comprise a statistically complete sample covering 10,714 square degrees from 266 fields taken on the Palomar 18-inch (46-cm) Schmidt telescope. Limiting magnitudes vary from field to field, distributed around B = 16.1 mag, ranging from 15.49 to 16.67. The dominant population is that of the hot, hydrogen atmosphere subdwarfs, the sdB stars, which comprise nearly 40 percent of the sample. At 16th magnitude, the hot subdwarf (sdB, sdO) number counts are increasing by about a factor of 2 per mag, the hot white dwarfs by 4 per mag, and quasars by 8 per mag. The result is a very different mix of spectral types expected at 18th mag than is found at 16th mag. The suggestion is made that the sdB stars are part of the old disk rather than a halo population. Publication: The Astrophysical Journal Supplement Series Pub Date: June 1986 DOI: 10.1086/191115 Bibcode: 1986ApJS...61..305G Keywords: Astronomical Catalogs; Stellar Spectra; Ultraviolet Astronomy; Astronomical Photometry; Astronomical Spectroscopy; Blue Stars; Quasars; Subdwarf Stars; White Dwarf Stars; Astronomy; PHOTOMETRY; QUASARS; STARS: FAINT BLUE; STARS: SPECTRAL CLASSIFICATION; STARS: STELLAR STATISTICS; STARS: SUBDWARFS; STARS: WHITE DWARFS full text sources ADS | data products NED (1884) SIMBAD (1881) CDS (3) Author (1) Related Materials (2) Catalog: 1996yCat. 2207....0G