The Complete Spectral Energy Distribution and the Atmospheric Properties of the Helium-Rich White Dwarf MCT 0501-2858

Details The Complete Spectral Energy Distribution and the Atmospheric Properties of the Helium-Rich White Dwarf MCT 0501-2858 The Complete Spectral Energy Distribution and the Atmospheric Properties of the Helium-Rich White Dwarf MCT 0501-2858

Jun 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998apj...500l..41v&link_type=abstract

Astrophysical Journal Letters v.500, p.L41

Astronomy and Astrophysics

Astronomy

9

Stars: Abundances, Stars: Individual Alphanumeric: Mct 0501-2858, Ultraviolet: Stars, Stars: White Dwarfs

Scientific paper

We analyze high-dispersion ultraviolet spectroscopic observations of the peculiar helium-rich white dwarf MCT 0501-2858. Ultraviolet spectra obtained during the 1996 November ORFEUS-SPAS II mission show the complete He II ( n=2 ) line series as well as narrow heavy-element lines; the spectrum constrains the effective temperature (68,600 +/- 1800 K) and surface gravity (log g=7.20+/-0.07 ), imposing a low mass (0.4 Msolar ) and short cooling age (105 yr) for the star. A study of the complete spectral energy distribution, based on EUVE, ORFEUS, and IUE spectra, shows that carbon is the second most abundant element [log (C/He) = -1.9] and that lower abundances are measured for other elements [log (N/He) = -4.0, log (O/He) = -3.3, log (Si/He) = -4.6, and log (P/He) = -6.2]. The new atmospheric parameters (temperature, gravity, and chemical composition) suggest a possible evolutionary filiation with the class of PG 1159 stars.

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