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A spectral study of Vega: A rapidly-rotating pole-on star
Hill, Graham; Gulliver, Austin F.; Adelman, Saul J.
The A-Star Puzzle, held in Poprad, Slovakia, July 8-13, 2004. Edited by J. Zverko, J. Ziznovsky, S.J. Adelman, and W.W. Weiss, IAU Symposium, No. 224. Cambridge, UK: Cambridge University Press, 2004., p.35-42
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Line: profiles, techniques: spectroscopic, stars: fundamental parameters, stars: individual (Vega), stars: rotation
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Ultra-high signal-to-noise, high dispersion spectroscopy over the wavelength range lambda 4487 - 4553 shows Vega to be a rapidly rotating star (Veq˜ 160 km s-1) seen almost pole-on. These data, analyzed anew, are combined with analyses of the hydrogen lines (Hgamma, Hbeta and Halpha) and the latest absolute continuum flux for Vega to yield the following results: V sin i=21.9± 0.1 km s-1, polar Teff=9680± 10 K, polar log g=4.00± 0.02 dex, Veq=160± 10 km s-1, xiT=1.08± 0.02 km s-1 and i=7.9± 0.5°. The variations in Teff and log g over the photosphere total 350 K and 0.06 dex, respectively. The mean Teff=9510± 10 K and mean log g=3.97± 0.02 dex agree with the spherical model values derived here and by others.

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