Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983pasp...95.1012p&link_type=abstract
Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 95, Dec. 1983, p. 1012-1018.
Astronomy and Astrophysics
Astronomy
16
Eclipsing Binary Stars, Stellar Spectrophotometry, Ultraviolet Spectra, Hot Stars, Iue, Light Curve, Main Sequence Stars, Supergiant Stars
Scientific paper
Epsilon Aurigae is a long-period eclipsing system containing a F0 Ia supergiant and an unseen slightly less-massive secondary. A primary eclipse began in mid-1982 with the unseen companion passing in front of the supergiant. Low-resolution ultraviolet (IUE) spectra of Epsilon Aur in 1982 and early 1983 provide eclipse light curves extending into the total phase of the current eclipse. The depth of eclipse from 3000 A to 1700 A is slightly deeper than at visual wavelengths (0.8 m). The depth declines for wavelengths less than 1700 A and is just 0.2 m at wavelengths less than 1300 A. The disappearance of the eclipse at wavelengths less than 1300 A may be attributed to a hot star or spot within the disk-shaped secondary. A main-sequence star of spectral type B0 accounts for the observations. However, an alternative site of the ultraviolet excess may be the primary's upper photosphere or chromosphere.
Lambert David L.
Parthasarathy Mudumba
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