Detection of Lyman-alpha in the spectrum of a white dwarf with helium atmosphere

Details Detection of Lyman-alpha in the spectrum of a white dwarf with helium atmosphere Detection of Lyman-alpha in the spectrum of a white dwarf with helium atmosphere

Jul 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989a%26a...219..276k&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 219, no. 1-2, July 1989, p. 276-278.

Astronomy and Astrophysics

Astrophysics

4

Helium, Lyman Alpha Radiation, Stellar Atmospheres, Stellar Spectra, White Dwarf Stars, Abundance, Atmospheric Models, Iue

Scientific paper

The detection of Ly-alpha absorption in a low dispersion IUE spectrum of the DBA white dwarf G200-39 is reported. The geocoronal emission was reduced by using a small aperture. For effective temperatures between 12,000 and 16,000, and log n(H)/n(He) values of -5, -4.5, -4, and -3.5, calculations giving colors and line strengths for He I 4472 A, H-alpha, H-beta, and H-gamma are presented. The results are compared with the G200-39 Ly-alpha profiles, showing an effective temperature of 14,500 + or - 500 K and a long n(H)/n(He) value of -4.0 + or - 0.25. It is shown that Ly-alpha is a strong indicator of trace hydrogen in DB star atmospheres.

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