Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010apj...712..250h&link_type=abstract
The Astrophysical Journal, Volume 712, Issue 1, pp. 250-259 (2010).
Astronomy and Astrophysics
Astronomy
8
Methods: Numerical, Stars: Atmospheres, Stars: Fundamental Parameters, Stars: Individual: Vega, Stars: Rotation
Scientific paper
Ultra-high signal-to-noise, high dispersion spectroscopy over the wavelength range λλ4519-4535 shows Vega to be a rapidly rotating star with V eq of 211 km s-1 seen almost pole-on. The analysis of five independent series of spectroscopic data is combined with analyses of the hydrogen lines, Hγ, Hβ, and Hα, and the latest absolute continuum flux for Vega to yield the following results: Vsin i = 20.8 ± 0.2 km s-1, polar Teff = 10, 000 ± 30 K, polar log g = 4.04 ± 0.01 dex, V eq = 211 ± 4 km s-1, breakup fraction = 0.81 ± 0.02, microturbulence (ξ T ) = 1.0 ± 0.1 km s-1, macroturbulence (ζ) = 7.4 ± 0.5 km s-1, and an inclination i = 5fdg7 ± 0fdg1. The variations in Teff and log g over the photosphere total 1410 K and 0.26 dex, respectively, while the mean temperature is 9560 ± 30 K and log g is 3.95 ± 0.01 dex. Low level variations in the Ti II 4529 Å profile are also illustrated.
Adelman Saul J.
Gulliver Austin F.
Hill Graham
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