Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982mnras.198..473w&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 198, Feb. 1982, p. 473-482.
Astronomy and Astrophysics
Astronomy
26
Atmospheric Composition, Helium Hydrogen Atmospheres, Infrared Astronomy, Infrared Photometry, Stellar Atmospheres, Stellar Spectrophotometry, White Dwarf Stars, Atmospheric Models, Chemical Composition, Opacity, Stellar Mass Accretion, Stellar Models, Stellar Temperature
Scientific paper
The results of a search for the effects of pressure-induced H2 dipole opacity on the infrared JHK magnitudes of cool white dwarfs are presented. LHS 1126 is found to be a very cool (electron temperature approximately equal to 4250 K) DC white dwarf with an H-rich atmospheric composition dominated by H2 dipole opacity in the infrared. The JHK photometry also favors an H-rich atmospheric composition for the DK white dwarfs LP 658-2 and W489. The surprisingly high proportion of hydrogen-rich white dwarfs in the present sample suggests that the mechanism which inhibits the accretion of hydrogen in the hotter helium stars becomes less effective at low (electron temperature not greater than 5500 K) temperatures. It is also suggested that the opacity due to the H3(+) ion may be responsible for the blanketing observed in the U and B magnitudes of some cool white dwarfs.
Allen David A.
Bessell Michael S.
Wickramasinghe Dayal T.
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