Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978aj.....83..975v&link_type=abstract
Astronomical Journal, vol. 83, Aug. 1978, p. 975-977.
Astronomy and Astrophysics
Astronomy
20
Astrometry, Astronomical Photography, Eclipsing Binary Stars, Orbital Mechanics, Photographic Plates, Stellar Magnitude
Scientific paper
Adopting the photometric period and a circular orbit for Epsilon Aurigae, the Sproul astrometric data over the interval 1939-1977 yield a relative parallax of -0.0010 arcmin + or - 0.0010 (p.e.), an orbit with a scale (a1) of 0.0227 + or - 0.0010 arcsec, an inclination of 89 deg, and a mode of 92 deg; these results satisfy the epoch of mideclipse within one year. Equating the astrometric angular and the spectroscopic linear value of a1, a parallax of 0.00172 + or - 0.00008 arcsec (distance 580 + or - 30 pc) is found, which yields an absolute visual magnitude of -5.9 for the visible component, not allowing for galactic absorption.
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