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Irregular Mass Transfer in the Polars VV Puppis and V393 Pavonis during the Low State
Ist Teil von
The Astrophysical journal, 2005-02, Vol.620 (1), p.416-421
Ort / Verlag
Chicago, IL: IOP Publishing
Erscheinungsjahr
2005
Quelle
EZB Electronic Journals Library
Beschreibungen/Notizen
The polars VV Pup and V393 Pav were observed with XMM-Newton during states of low accretion with peak X-ray luminosities of similar to 1 x 10 super(30) and similar to 1 x 10 super(31) ergs s super(-1), respectively. In both polars, accretion onto the white dwarf was extremely irregular, and the accretion rate varied by more than 1 order of magnitude on timescales of similar to 1 hr. Our observations suggest that this type of irregular accretion is a common phenomenon in polars during the low state. The likely cause of the accretion rate fluctuations is coronal mass ejections or solar flares on the companion star that intermittently increase the mass transfer into the accretion stream. Our findings demonstrate that the companion stars in cataclysmic variables possess highly active atmospheres.
Sprache
Englisch
Identifikatoren
ISSN: 0004-637X
eISSN: 1538-4357
DOI: 10.1086/427021
Titel-ID: cdi_iop_primary_10_1086_427021
Format
–
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