The hydrogen-rich, cool DA white dwarf Ross 627

Details The hydrogen-rich, cool DA white dwarf Ross 627 The hydrogen-rich, cool DA white dwarf Ross 627

Jun 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983a%26a...122..297l&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 122, no. 1-2, June 1983, p. 297-300. Research supported by the Deutsche Forsch

Astronomy and Astrophysics

Astrophysics

16

Abundance, Spectral Line Width, Stellar Atmospheres, Stellar Spectra, White Dwarf Stars, Atmospheric Composition, Atmospheric Models, Balmer Series, Cosmochemistry, Helium, Hydrogen, Stellar Spectrophotometry

Scientific paper

The cool white dwarf Ross 627 (EG79), the original prototype of the DA,F spectral class, is analyzed using new spectrophotometry to the Balmer series limit and a new grid of model atmospheres. The analysis shows that the strengths of high Balmer lines may be used to provide discrimination between the effects of the assumed surface gravity and helium abundance. Ross 627 is then required to have a hydrogen-rich (H/He greater than 1) atmospheric composition. The new digital spectra are in good agreement with Greenstein's (1960) photographic profiles of the hydrogen lines, but no significant Ca II 'K' 3933-A line is detected. Therefore, Ross 627 should be classified DA.

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