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Evidence for an accretion steam in the low-accretion-rate polar J2048

Kafka, S. and Tappert, C. and Honeycutt, R. K. (2010) Evidence for an accretion steam in the low-accretion-rate polar J2048. Monthly Notices of the Royal Astronomical Society, 403 (2). pp. 755-759. ISSN 0035-8711.

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We present new red/near-infrared spectra of the low-accretion-rate polar J204827.9+005008.9. Compared to 2004 spectra in the literature, our 2008 data show more structured emission-line profiles. All emission lines in our spectra have two components at most orbital phases. The stronger component has a sinusoidal velocity variation (K~ 120 km s^(−1)) and is likely due to irradiation of the inner hemisphere of the secondary star by the white dwarf. Based on the appearance of the Hα Doppler tomogram, the weaker, larger amplitude, line component likely originates in a ballistic stream from the L1 point. J2048 is thought to be accreting via a wind from the secondary star, so the detection of velocity features consistent with the velocities of Roche lobe overflow is unexpected. It appears that J2048 was experiencing an interval of enhanced mass transfer during our observations. We briefly discuss scenarios that might lead to such a situation, such as changes in the chromospheric activity level on the secondary star.

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Additional Information:© 2010 The Authors. Journal compilation © 2010 RAS. Accepted 2009 November 17. Received 2009 November 9; in original form 2009 May 20. We would like to thank Don Hoard for fruitful discussions.
Subject Keywords:stars: individual: J204827; 9+005008; 9; stars: late-type; stars: magnetic fields; novae; cataclysmic variables
Issue or Number:2
Record Number:CaltechAUTHORS:20100414-131139476
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:17981
Deposited By: Tony Diaz
Deposited On:04 May 2010 01:27
Last Modified:03 Oct 2019 01:36

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