Rotational feature of Vega and its impact on abundance determinations

Details Rotational feature of Vega and its impact on abundance determinations Rotational feature of Vega and its impact on abundance determinations

Apr 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008coska..38..157t&link_type=abstract

Contributions of the Astronomical Observatory Skalnaté Pleso, vol. 38, no. 2, p. 157-162.

Astronomy and Astrophysics

Astronomy

Stars: Abundances, Stars: Atmospheres, Stars: Early-Type, Stars: Fundamental Parameters, Stars: Rotation, Stars: Individual: Vega

Scientific paper

In order to establish Vega's absolute rotational velocity (ve) separated from the inclination angle (i), while making use of the fact that information on rotation-induced gravity darkening is reflected in the characteristic spectral line shapes, we conducted a detailed profile study on a large number of weak lines based on the very high S/N spectrum data, and concluded that ve ≃ 175 kms-1 (with i ≃ 7°) is the best solution. It also turned out that the conventionally derived abundances from FeI lines by using classical model atmospheres tend to be overestimated by up to ˜ 0.2 dex, though this effect is insignificant for FeII lines. Such gravity-darkening corrections may have an appreciable impact on the FeI/FeII ionization equilibrium as well as on the determination of the microturbulence.

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