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- W83002382 abstract "view Abstract Citations (106) References (14) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS The Lowell Suspect White Dwarfs Greenstein, Jesse L. Abstract A survey of eighty-six suspected white dwarfs in the Lowell GD lists shows that fifty-four are in fact, white dwarfs. These stars have a considerably smaller mean proper motion and a somewhat bluer mean color than the 202 stars observed by Eggen and Greenstein. Otherwise, the GD stars are normal white dwarfs of lower space motion than the EG sample. Line profiles, equivalent widths, and central absorp- tions are normal. The properties of these degenerate stars of the low-velocity population are shown in graphic form. Ten hot subdwarfs were found; twenty-two horizontal-branch stars or yellow subdwarfs were also found. A few especially interesting stars are noted, including GD 108, which seems to be of intermediate luminosity, and three very hot, probably helium-rich, 0-type subdwarfs, GD 298, 299, and 300. The GD white dwarfs are largely Population I kinematically, with a tangential velocity of 30 km sec1; some, therefore, are descended from recently evolved massive stars. The blue high-velocity white dwarfs are all descended from stars near the present turnoff point in the old disk and halo populations, i.e., at most 1.5 Mo. The newly determined low-velocity white dwarfs, combined with those found by blue color alone, show some interesting differences in distribution of spectral peculiarities. The frequency, corrected for color differences, of the helium-rich DB stars is about triple that in the very high-velocity group. If accretion provides the normal DA star its surface hydrogen, it is odd that the helium charac- teristic is not suppressed in the GD stars. The carbon-rich, X4670 stars are rare in the low-velocity group, again an effect opposite in sense to that predicted by stellar evolution, where the more massive stars should produce carbon. However, the number expected is small. A few GD stars show peculiar line widths suggesting a rotation which, though appreciable, is smaller than expected from contraction of massive Population I stars. New spectra are given of twenty-two white dwarfs of larger proper motion. Several new suspected red degenerates (EG 254, 256) have been found. A new type of white dwarf with molecular bands may exist in EG 248, which shows broadened CII and possibly C2 features. The EG list is continued to EG 266 Publication: The Astrophysical Journal Pub Date: October 1969 DOI: 10.1086/150191 Bibcode: 1969ApJ...158..281G full text sources ADS | data products SIMBAD (89)" @default.
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- W83002382 date "1969-10-01" @default.
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- W83002382 title "The Lowell Suspect White Dwarfs" @default.
- W83002382 doi "https://doi.org/10.1086/150191" @default.
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