Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...263..249s&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 263, no. 1-2, p. 249-257.
Astronomy and Astrophysics
Astrophysics
26
Calcium, Iron, Stellar Composition, Stellar Spectra, Subdwarf Stars, Charge Coupled Devices, Metallicity, Stellar Atmospheres, Stellar Models, Stellar Spectrophotometry
Scientific paper
A detailed model atmosphere analysis of calcium and iron lines is used to derive a set of self-consistent atmospheric parameter for the subdwarf Gmb 1830. T(eff) is found to be 5170 +/- 70 K, slightly hotter than previous estimates based on photometric indices. The surface gravity is slightly greater than that of the sun. There is a clear difference in logarithmic abundance, relative to the sun, between calcium and iron such that (Ca/H) exceeds (Fe/H) by about 0.3 dex. The logarithmic abundance of magnesium, relative to the sun, is close to that of calcium. Test calculations indicate that it is the relative abundance of alpha-particle elements, presumably mainly Mg and Si, which largely controls the electron pressure of the atmosphere. The microturbulence in Gmb 1830 is similar to that found in other G and early K type dwarf stars.
Lambert David L.
Ruck M. J.
Smith Gordon
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