Volume 468, Number 2, June III 2007The XMM-Newton extended survey of the Taurus molecular cloud
|Page(s)||643 - 647|
|Section||Stellar structure and evolution|
|Published online||11 April 2007|
On the orbital period of the magnetic cataclysmic variable HS 0922+1333
Observatorio Astrónomico Nacional SPM, Instituto de Astronomía, Universidad Nacional Autónoma de México, Ensenada, BC, México (PO Box 439027, San Diego, CA, 92143-9024, USA.) e-mail: [gag;zhar]@astrosen.unam.mx
Accepted: 18 March 2007
Context.The object HS 0922+1333 was visited briefly in 2002 in a mini survey of low accretion rate polars (LARPs) in order to test if they undergo high luminosity states similar to ordinary polars. On the basis of that short observation the suspicion arose that the object might be an asynchronous polar (Tovmassian et al. 2004). The disparity between the presumed orbital and spin period appeared to be quite unusual.
Aims.We performed follow-up observations of the object to resolve the problem.
Methods.New simultaneous spectroscopic and photometric observations spanning several years allowed measurements of radial velocities of emission and absorption lines from the secondary star and brightness variations due to synchrotron emission from the primary.
Results.New observations show that the object is actually synchronous and its orbital and spin period are equal to 4.04 h.
Conclusions. We identify the source of confusion of previous observations to be a high velocity component of emission line arousing from the stream of matter leaving L1 point.
Key words: binaries: close / binaries: spectroscopic / novae, cataclysmic variables / white dwarfs / magnetic fields / stars: individual: HS 0922+1333
© ESO, 2007
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.