Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985eepa.rept...23b&link_type=abstract
In NASA, Washington The 1982-1984 Eclipse of Epsilon Aurigae p 23-32 (SEE N86-12168 02-89)
Astronomy and Astrophysics
Astronomy
3
Auriga Constellation, Eclipsing Binary Stars, Infrared Photometry, Stellar Temperature, Color, Eclipses, Infrared Astronomy, Light Curve, Pulsed Radiation, Spectral Bands
Scientific paper
The infrared photometry of epsilon Aur performed prior to and during the ingress phase of the recent eclipse allowed the first solid determination of the temperature of the secondary object. The eclipse depth was significantly less at lambda 5 micrometers than in the near-infrared. This is explained by a model of the secondary as an opaque and very cool object with a temperature of approx. 500 K. During eclipse, the secondary blocks approximately 45% of the near infrared radiation from the primary star. At the same time, the radiation from the secondary remains completely unobscured, resulting in a shallower light curve at longer wavelengths. This phenomenon is well known in the study of eclipsing binary stars; if the two stars have different colors, then the net color of the system changes during eclipse. In the case of epsilon Aur, the eclipsing object has a color deep in the infrared, so the effect is only noticeable there.
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