Other
Scientific paper
Dec 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004iaus..224...35h&link_type=abstract
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,
Other
17
Line: Profiles, Techniques: Spectroscopic, Stars: Fundamental Parameters, Stars: Individual (Vega), Stars: Rotation.
Scientific paper
Ultra-high signal-to-noise, high dispersion spectroscopy over the wavelength range λ 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 (Hγ, Hβ and Hα) 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, ξT=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.
Adelman Saul J.
Gulliver Austin F.
Hill Graham
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