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Title:
MAP-based Trigonometric Parallaxes of ALTAIR and VEGA
Authors:
Gatewood, George; de Jonge, Joost Kiewiet
Publication:
Astrophysical Journal v.450, p.364 (ApJ Homepage)
Publication Date:
09/1995
Origin:
APJ; KNUDSEN
Astronomy Keywords:
STARS: DISTANCES, STARS: INDIVIDUAL NAME: ALTAIR, STARS: INDIVIDUAL NAME: VEGA, STARS: FUNDAMENTAL PARAMETERS, STARS: LOW-MASS, BROWN DWARFS
DOI:
10.1086/176146
Bibliographic Code:
1995ApJ...450..364G

Abstract

Trigonometric parallaxes for stars in the regions of the nearby main-sequence A stars Altair and Vega are derived from data collected with the Multichannel Astrometric Photometer (MAP) and associated Thaw refractor of the University of Pittsburgh's Allegheny Observatory. The weighted mean parallax of all trigonometric studies of Altair is now +0".1963±0".00077, corresponding to a distance modulus of 1.465±0.009 mag and an absolute visual magnitude of 2.22±0.012. Altair's diameter is 1.63±0.08 solar diameters. The weighted mean trigonometric parallax of all trigonometric studies of Vega is now 0".1300±0".00077, yielding a distance modulus of 0.570±0.013 and an absolute visual magnitude of 0.60±0.013. Vega's diameter is 2.68 + 0.06 solar diameters. The apparent motion of both stars is linear over the period of observation, strongly suggesting the absence of short-period (1-6 yr) stellar or brown dwarf companions to either star. We also find a parallax of 0".0155±0".0006 for the high proper motion F8 reference star BD +38°3231. The derived luminosity, UV excess, and high space motion of this star all indicate that it is a subdwarf.

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