Two new ROSAT discovered high field polars: RX J2022.6-3954 in Sagittarius and RX J0132.7-6554 in Hydrus.

Details Two new ROSAT discovered high field polars: RX J2022.6-3954 in Sagittarius and RX J0132.7-6554 in Hydrus. Two new ROSAT discovered high field polars: RX J2022.6-3954 in Sagittarius and RX J0132.7-6554 in Hydrus.

Nov 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997a%26a...327..183b&link_type=abstract

Astronomy and Astrophysics, v.327, p.183-190

Astronomy and Astrophysics

Astrophysics

11

Accretion, Accretion Disks, Stars: Individual (Rx J2022.6-3954), Stars: Individual (Rx J0132.7-6554), Stars: Novae, Cataclysmic Variables, Stars: Magnetic X-Rays: Stars

Scientific paper

We report the discovery of two new AM Herculis systems (polars), identified as the optical V~19mag and V~20mag counterparts of the soft X-ray sources RXJ2022.6-3954 and RXJ0132.7-6554 detected during the ROSAT All-Sky Survey and present the results of our optical and X-ray follow-up observations. From the cyclotron emission lines detected in the optical spectra we determine magnetic field strengths in the accretion region of B=67(2)MG for RXJ2022.6-3954 and B=68(2)MG for RXJ0132.7-6554. With P_orb_=78.0176(4)min for RXJ2022.6-3954 and P_orb_=77.831(8)min for RXJ0132.7-6554 both objects have orbital periods which lie at the lower limit of the period distribution of CVs. RXJ0132.7-6554 is the shortest period polar yet detected. Both objects show no eclipse by the secondary stars, and, therefore must have orbital inclinations of i<~85°. As RXJ2022.6-3954 shows a dip due to the accretion stream crossing our line-of-sight and the accretion region on the white dwarf is partially self-eclipsed we can further constrain the orbital inclination and co-latitude of the magnetic pole to be 45°δ>5°. From the absence of M-star features in the faint phase spectra of both objects we obtain a lower limit for the distance to RXJ2022.6-3954 of d>190pc and to RXJ0132.7-6554 of d>300pc . The high magnetic fields and short orbital periods make both objects highly interesting in the context of the evolution of accreting close-binary systems.

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