Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982ap%26ss..88..135d&link_type=abstract
Astrophysics and Space Science, vol. 88, no. 1, Nov. 1982, p. 135-158. Research supported by the Ministero degli Affari Esteri
Astronomy and Astrophysics
Astrophysics
8
B Stars, Cosmochemistry, Peculiar Stars, Spectroscopic Analysis, Stellar Spectrophotometry, Abundance, Balmer Series, H Lines, Manganese, Mercury (Metal), Spectral Energy Distribution, Stellar Atmospheres, Stellar Spectra, Ultraviolet Spectra
Scientific paper
Coude-spectrographic data for the visible and UV are employed to determine the atmospheric chemical composition of alpha And. Nothing that five previous observations of the star by other researchers failed to produce a consensus for the spectra, the present study considered only lines which were present in all the spectra obtained. The detected energy distribution indicated an effective temperature within 350 of 13850 K, a surface gravity around 3.85, and a microturbulence velocity of 2.5-3.5 km/sec. Normal C and Si abundances were present, along with overabundances of Mg, S, and Fe. Significant overabundances of P, Mn, Ga, Sr, Y, Zr, Eu, and Hg were detected. It is suggested that alpha And has a circumstellar envelope, indicating an unstable atmosphere and mass loss.
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