Astronomy and Astrophysics – Astronomy
Scientific paper
May 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...210.7504s&link_type=abstract
American Astronomical Society Meeting 210, #75.04; Bulletin of the American Astronomical Society, Vol. 39, p.182
Astronomy and Astrophysics
Astronomy
Scientific paper
The extremely long period eclipsing binary, epsilon Aurigae, is approaching its next eclipse event [2009 Aug through 2011 May]. The 27.1 year binary features an otherwise normal enough F0 supergiant but an optically invisible companion that causes the two year long eclipse. Observations compiled during the 1982-1984 eclipse are reported by Stencel (1985 NASA Conf. Publ. 2384 available on request) and current interpretation was summarized by Carroll et al. (1991 Ap.J. 367: 278). In preparation for the next eclipse, UBVJH photometry and H-alpha spectroscopy are being pursued by Jeff Hopkins (webpage http://www.hposoft.com/Astro/PEP/EAURDATA.html ) and Lothar Schanne (webpage http://www.konkoly.hu/cgi-bin/IBVS?5747 ). In collaboration with Hopkins and Schanne, plus Tom Ake, Dana Backman, Dan Clemens, Ed Guinan and Dale Mais, we have pursued additional data including Mimir spectra and Spitzer IRS and MIPS observations. We report here on the Spitzer IRS and MIPS SED data from Cycle 2 program 20058, which reveal a bright continuum with weak emission lines at times of observations. Line identifications and their diagnostics are consistent with nebular emission associated with the F supergiant. Additional epoch observations will help determine whether companion contributions appear in the infrared. Persons interested in participating in the multiwavelength campaign for the 2009 eclipse are invited to visit webpage: http://www.du.edu/ rstencel/epsaur.htm for details. We are grateful for partial support of this effort from JPL contract 1275955 to the University of Denver, and the estate of William Herschel Womble in support of astronomy at the University of Denver.
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