The Astronomical Journal, 142:174 (9pp), 2011 November doi:10.1088/0004-6256/142/5/174 C 2011. The American Astronomical Society. All rights reserved. Printed in the U.S.A. INFRARED STUDIES OF EPSILON AURIGAE IN ECLIPSE Robert E. Stencel1, Brian K. Kloppenborg1, Randall E. Wall, Jr.1, Jeffrey L. Hopkins2, Steve B. Howell3, D. W. Hoard4, John Rayner5, Schelte Bus5, Alan Tokunaga5, Michael L. Sitko6,7, Suellen Bradford6,7, Ray W. Russell8, David K. Lynch8, Heidi Hammel9, Barbara Whitney9, Glenn Orton10, Padma Yanamandra-Fisher10, Joseph L. Hora11,PhilipHinz12, William Hoffmann12, and Andrew Skemer12 1 Department of Physics & Astronomy, University of Denver, Denver, CO 80208 USA;
[email protected] 2 Hopkins Phoenix Observatory, Phoenix, AZ 85033 USA 3 National Optical Astronomy Observatories, Tucson, AZ 85719, USA 4 Spitzer Science Center, California Institute of Technology, Pasadena, CA 91125, USA 5 Institute for Astronomy, University of Hawaii, Honolulu, HI 96822, USA 6 Department of Physics, Cincinnati University, Cincinnati, OH, USA 7 Space Science Institute, Boulder, CO, USA 8 The Aerospace Corporation, Los Angeles, CA 90009, USA 9 Space Science Institute, Boulder, CO 80301, USA 10 Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109, USA 11 Harvard-Smithsonian Center for Astrophysics, Cambridge, MA 02138, USA 12 Steward Observatory, Department of Astronomy, University of Arizona, Tucson, AZ 85721, USA Received 2011 July 7; accepted 2011 September 16; published 2011 October 17 ABSTRACT We report here on a series of medium resolution spectro-photometric observations of the enigmatic long period eclipsing binary epsilon Aurigae, during its eclipse interval of 2009–2011, using near-infrared spectra obtained with SpeX on the Infrared Telescope Facility (IRTF), mid-infrared spectra obtained with BASS on AOES and IRTF, MIRSI on IRTF, and MIRAC4 on the MMT, along with mid-infrared photometry using MIRSI on IRTF and MIRAC4 on the MMT, plus 1995–2000 timeframe published photometry and data obtained with Denver’s TNTCAM2 at WIRO.