Other
Scientific paper
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).
Cottrell Peter L.
Greenstein Jesse Leonard
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