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Title:
Infrared Photometry and Spectroscopy of VY Aqr and EI Psc: Two Short-Period Cataclysmic Variables With Curious Secondary Stars
Authors:
Harrison, Thomas E.; Bornak, Jillian; Howell, Steve B.; Mason, Elena; Szkody, Paula; McGurk, Rosalie
Affiliation:
AA(Department of Astronomy, New Mexico State University, Box 30001, MSC 4500, Las Cruces, NM 88003-8001, USA ; Visiting Astronomer, Kitt Peak National Observatory, National Optical Astronomy Observatory, which is operated by the Association of Universities for Research in Astronomy, Inc., under cooperative agreement with the National Science Foundation. ; Visiting observers, W. M. Keck Observatory, which is operated as a scientific partnership among the California Institute of Technology, the University of California, and the National Aeronautics and Space Administration.; ), AB(Department of Astronomy, New Mexico State University, Box 30001, MSC 4500, Las Cruces, NM 88003-8001, USA ; Visiting observers, W. M. Keck Observatory, which is operated as a scientific partnership among the California Institute of Technology, the University of California, and the National Aeronautics and Space Administration.; ), AC(WIYN Observatory and National Optical Astronomy Observatories, 950 North Cherry Avenue, Tucson, AZ 85726, USA ; Visiting Astronomer, Kitt Peak National Observatory, National Optical Astronomy Observatory, which is operated by the Association of Universities for Research in Astronomy, Inc., under cooperative agreement with the National Science Foundation. ; ), AD(European Southern Observatory (ESO) Alonso de Cordova 3107, Vitacura, Santiago, Chile ), AE(Department of Astronomy, University of Washington, Box 351580, Seattle, WA 98195, USA ), AF(Department of Astronomy, University of Washington, Box 351580, Seattle, WA 98195, USA )
Publication:
The Astronomical Journal, Volume 137, Issue 4, pp. 4061-4071 (2009). (AJ Homepage)
Publication Date:
04/2009
Origin:
IOP
AJ Keywords:
infrared: stars, stars: individual: VY Aqr EI Psc
DOI:
10.1088/0004-6256/137/4/4061
Bibliographic Code:
2009AJ....137.4061H

Abstract

We present new K-band spectra of VY Aqr and EI Psc obtained with NIRSPEC on the Keck II telescope. We find a best-fitting spectral type of K4 for EI Psc, in agreement with the previous classification. The Keck spectrum of VY Aqr suggests an M0 spectral type, much hotter than previously derived. We re-reduce the original data for VY Aqr that were obtained using ISAAC on the Very Large Telescope (VLT) and find a best-fitting spectral type of M6 for VY Aqr. We are unable to reconcile the two data sets. We analyze new phase-resolved optical spectroscopy of VY Aqr, obtained using UVES on the VLT, to derive the mass ratio, and show that the mass of its secondary star is very likely below the stellar/substellar boundary. We also present and model phase-resolved JHK infrared light curves for both objects, and g- and I-band light curves for EI Psc. While the light curve models for EI Psc are consistent with its spectral type, we are unable to model the light curves of VY Aqr without assuming binary star parameters outside the published range for this object.

Partly based on observations made with the ESO Telescopes at Paranal Observatory under programs 65.H-0409 (archival data) and 69.D-0391(A).


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