Light-element abundances in the weak G-band star HR 6766

Details Light-element abundances in the weak G-band star HR 6766 Light-element abundances in the weak G-band star HR 6766

Jun 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978apj...222..585s&link_type=abstract

Astrophysical Journal, Part 1, vol. 222, June 1, 1978, p. 585-594. Research supported by the Robert A. Welch Foundation

Astronomy and Astrophysics

Astrophysics

37

Abundance, Atomic Spectra, Light Elements, Stellar Atmospheres, Stellar Models, Stellar Spectra, Atmospheric Models, Carbon Isotopes, Emission Spectra, Line Spectra, Lithium, Nitrogen, Oxygen, Stellar Spectrophotometry

Scientific paper

Results are presented for a model-atmosphere analysis of iron-peak elements, the CNO group, and lithium in the weak G-band star HR 6766. Synthetic spectra are generated to derive the carbon, nitrogen, oxygen, and lithium abundances; the C-12/C-13 ratio is determined from a curve-of-growth analysis. An effective temperature of 4750 + or 100 K is estimated along with log g of 2.0 + or - 0.4 and a microturbulent velocity of 2.0 + or - 0.5 km/s. The overall metal abundance derived from these parameters is shown to indicate a marginally significant metal deficiency, and it is suggested that HR 6766 appears to be in most respects a normal late G or early K giant. An analysis of the carbon abundance based purely on the G band of CH reveals a very large underabundance of carbon. A C-12/C-13 ratio of about 4.1 is obtained, the results are compared with those for Epsilon Virginis, and the mass and luminosity of HR 6766 are discussed.

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