Analysis of Optical and Ultraviolet Spectroscopy of the DAZ White Dwarf G74-7

Details Analysis of Optical and Ultraviolet Spectroscopy of the DAZ White Dwarf G74-7 Analysis of Optical and Ultraviolet Spectroscopy of the DAZ White Dwarf G74-7

Oct 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997apj...488..368b&link_type=abstract

Astrophysical Journal v.488, p.368

Astronomy and Astrophysics

Astronomy

6

Stars: White Dwarfs, Stars: Individual Alphanumeric: G74-7, Ultraviolet: Stars

Scientific paper

We present new spectroscopic and photometric observations of the cool DAZ white dwarf G74-7. These data are combined with archival HST Faint Object Spectrograph data covering the range 1700--3200 A, allowing estimates of the Ca, Mg, and Fe abundances in this object. Our analysis suggests that G74-7 is a hydrogen-rich star of normal gravity, with Teff = 7320 K and the following photospheric abundances: log (Ca/H) = -8.8 +/- 0.2, log (Mg/H) = -8.1 +/- 0.3, and an upper limit to log (Fe/H) <~ -5. These new results are considered within the framework of current models proposed to explain the presence of heavy elements in the high-gravity photospheres of white dwarf stars.

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