Astronomy and Astrophysics – Astrophysics – Galaxy Astrophysics
Scientific paper
2012-02-29
Astronomy and Astrophysics
Astrophysics
Galaxy Astrophysics
5 pages, 2 figures; to be published in Astrophysical Journal Letters
Scientific paper
We present Herschel Space Observatory photometric observations of the unique, long-period eclipsing binary star Epsilon Aurigae. Its extended spectral energy distribution is consistent with our previously published cool (550 K) dust disk model. We also present an archival infrared spectral energy distribution of the side of the disk facing the bright F-type star in the binary, which is consistent with a warmer (1150 K) disk model. The lack of strong molecular emission features in the Herschel bands suggests that the disk has a low gas-to-dust ratio. The spectral energy distribution and Herschel images imply that the 250 GHz radio detection reported by Altenhoff et al. is likely contaminated by infrared-bright, extended background emission associated with a nearby nebular region and should be considered an upper limit to the true flux density of Epsilon Aur.
Hoard Donald Wayne
Howell Steve B.
Ladjal Djazia
Stencel Robert E.
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