Other
Scientific paper
Sep 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...308l..67s&link_type=abstract
Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 308, Sept. 15, 1986, p. L67-L69.
Other
8
Abundance, Calcium, Stellar Mass Accretion, White Dwarf Stars, Helium, Interstellar Matter, Spectrum Analysis, Stellar Atmospheres, Stellar Spectrophotometry, Stellar Temperature
Scientific paper
The paper reports the discovery of a second, extremely rare DBZ degenerate CBS 78 which reveals photospheric calcium in its nearly pure helium atmosphere. The presence of calcium strongly suggests accretion of interstellar matter as its origin, but hydrogen is not detected. The properties of CBS 78 are compared with other cool helium-rich degenerates with metals. The suggested existence of an empirical correlation between the hydrogen-to-calcium abundance ratio and effective temperature is confirmed. This correlation shows that above a critical temperature of about 11,000 K, a screening mechanism is operative which prevents accretion of interstellar hydrogen onto white dwarfs; this mechanism apparently does not operate at lower temperatures.
Liebert James
Shipman Harry L.
Sion Edward M.
Starrfield Sumner G.
Wagner Robert Marcus
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