Observations of Proper-Motion Stars. III.

Abstract

view Abstract Citations (138) References (13) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Observations of Proper-Motion Stars. III. Eggen, Olin J. ; Greenstein, Jesse L. Abstract Spectra, colors, and space motions are given for 31 additional white dwarfs. Figures 1 and 2 (Plates 10 and 11) illustrate, at low resolution, the appearance of normal DA stars, as well as the peculiar DB and red degenerate stars The peculiar stars cover a wide range of UB V colors, as shown in Figure 3 Spectra are not uniquely determined by color, although DB stars occur in a narrowly limited range, and the line- less DC type is common among the redder stars The reddest, and intrinsically faintest stars observed (Table 3) reach nearly to M = +16, and systematically are brighter and larger than expected, with deduced radii near 0.03 Ro. Stars with smaller radius than 001 Ro are rare at all colors The space motions of 132 stars of known luminosity are shown in Figure 5, and demonstrate clearly the mixed nature of the sample; the tangential motions of 22 per cent of the stars are less than 20 km/sec, but for 10 per cent are larger than 100 km/sec A peculiar concentration in velocity space exists for DB stars. Table 4 contains data on about 30 proper-motion stars that are not white dwarfs. A small group of these either have unacceptably high motions or are bluish stars of luminosity near +4 or +5. One, GD 210, = BPM 79017, may be variable. Publication: The Astrophysical Journal Pub Date: December 1967 DOI: 10.1086/149392 Bibcode: 1967ApJ...150..927E full text sources ADS | data products SIMBAD (35) Related Materials (3) Part 1: 1916AJ.....29..183B Part 2: 1922PWasO..14.....C Part 3: 1965ApJ...142..925E