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Orbit-resolved photometry and echelle spectroscopy of the cataclysmic variable ST LMi during a 2007 high state

Robertson, Jeff W. and Howell, Steve B. and Honeycutt, R. K. and Kafka, S. and Campbell, T. (2008) Orbit-resolved photometry and echelle spectroscopy of the cataclysmic variable ST LMi during a 2007 high state. Astronomical Journal, 136 (5). pp. 1857-1865. ISSN 0004-6256.

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We present high-resolution echelle spectra and contemporaneous photometry of the polar ST LMi during a high state in 2007 March. Emission lines at Hα, He I λ5876, and He I λ7065 show similar line profiles over orbital phase and have narrow and broad components. These profile changes with phase are very similar to those reported in earlier high-state studies of ST LMi. The radial velocity curves from double Gaussian fits to the line profiles are interpreted as two crossing curves, neither of which is coincident with the orbital motion of the secondary star. We attribute one component to infall motions near the white dwarf and the other to a gas streaming along magnetic field lines connecting the two stars.

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Howell, Steve B.0000-0002-2532-2853
Additional Information:© 2008 The American Astronomical Society. Received 2008 April 28, accepted for publication 2008 August 22. Published 2008 September 30. Print publication: Issue 5 (2008 November). We thank the Kitt Peak Director, Buell Januzzi, and Mike Merrill for their allocation of 4 m time for this pilot project. We also thank Daryl Willmarth for help with our instrument setup. Online-only material: color figures.
Subject Keywords:binaries: close; novae, cataclysmic variables; stars: individual (ST LMi)
Issue or Number:5
Record Number:CaltechAUTHORS:ROBaj08
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:11916
Deposited By: Archive Administrator
Deposited On:09 Oct 2008 21:57
Last Modified:03 Oct 2019 00:23

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