HS0922+1333: another low accretion rate polar with a pronounced cyclotron line spectrum

Details HS0922+1333: another low accretion rate polar with a pronounced cyclotron line spectrum HS0922+1333: another low accretion rate polar with a pronounced cyclotron line spectrum

Jun 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000a%26a...358l..45r&link_type=abstract

Astronomy and Astrophysics, v.358, p.L45-L48 (2000)

Astronomy and Astrophysics

Astrophysics

25

Stars: Individual: Hs0922+1333, Stars: Novae, Cataclysmic Variables, Stars: Magnetic Fields, Stars: White Dwarfs, Stars: Binaries: General

Scientific paper

We present time resolved spectroscopy of the newly discovered magnetic CV HS 0922+1333. Our observations show that it has a period of 244+/-2 min. Its optical spectra are dominated by a strong single spot cyclotron line at 5334 Ä. A detailed analysis shows that further cyclotron harmonics are at 7800 Ä (hidden by the M dwarf companion) and at 4034 Ä which yields a field strength of 66 MG (n = 2, 3 and 4). A much weaker spot appears to be present at antiphase with B =~ 81 MG (n = 2 and 3 visible). HS 0922+1333 does not show any emission lines (like Balmer, HeII) except the cyclotron harmonics. It has an extremely low accretion rate of the order of 3 * 10-13Msun yr-1, atypical for its long period. It has not been detected by ROSAT. HS 0922+1333 is the third member of a class of strong cylotron line emitters (low accretion rates) defined by HS 1023+3900 and 1RXS J012851.9-233933, both probably in the CV period gap, while HS 0922+1333 is clearly above the period gap. At a distance of 190 pc the WD primary is rather faint (M_B = 12.6) and cool (T_eff <= 10 000 K) implying the system is old. Based on observations at the German - Spanish observatory (DSAZ) on Calar Alto, Spain

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