Calcium and magnesium in the helium white dwarf GD 401

Details Calcium and magnesium in the helium white dwarf GD 401 Calcium and magnesium in the helium white dwarf GD 401

Nov 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apj...242..195c&link_type=abstract

Astrophysical Journal, Part 1, vol. 242, Nov. 15, 1980, p. 195-198.

Other

15

Abundance, Calcium, Magnesium, White Dwarf Stars, Atmospheric Models, Line Spectra, Stellar Atmospheres, Stellar Spectra, Stellar Structure

Scientific paper

A calcium abundance (Ca/He = 6 x 10 to the -9th to 9 x 10 to the -9th) was derived for the DB degenerate object GD 401 using spectrum synthesis techniques and observational data obtained with the SIT spectrograph. The data were also used to derive upper limits for the Mg/He and Fe/He ratios of 1 x 10 to the -8th and 6 x 10 to the -9th respectively. Two conclusions are made from the analysis: (1) calcium is deficient relative to the sun, contrary to the estimates of Liebert et al. (1979); and (2) the Mg/Ca ratio limit is much smaller than the solar value, contrary to the results of the two other well-studied metal-line white dwarfs (Ross 640 and van Maanen 2).

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