Query : 1997A&A...327..183B

1997A&A...327..183B - Astronomy and Astrophysics, volume 327, 183-190 (1997/11-1)

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


Abstract (from CDS):

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 RX J2022.6-3954 and RX J0132.7-6554 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 RX J2022.6-3954 and B=68(2)MG for RX J0132.7-6554. With Porb=78.0176(4)min for RX J2022.6-3954 and Porb=77.831(8)min for RX J0132.7-6554 both objects have orbital periods which lie at the lower limit of the period distribution of CVs. RX J0132.7-6554 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 RX J2022.6-3954 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°<i<85° and 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 RX J2022.6-3954 of d>190pc and to RX J0132.7-6554 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.

Abstract Copyright:

Journal keyword(s): accretion, accretion disks - stars: individual (RX J2022.6-3954) - stars: individual (RX J0132.7-6554) - stars: novae, cataclysmic variables - stars: magnetic X-rays: stars

Simbad objects: 5

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Number of rows : 5
N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
1 V* CV Hyi CV* 01 32 43.38 -65 54 37.3           ~ 24 0
2 V* FH UMa CV* 10 47 09.88 +63 35 13.6   19.4       ~ 24 0
3 V* AR UMa CV* 11 15 44.5891034908 +42 58 22.431026739     16.4     D+M 131 0
4 V* EV UMa CV* 13 07 53.8579537224 +53 51 30.500194464           ~ 60 0
5 V* V4738 Sgr CV* 20 22 37.69 -39 54 08.6           ~ 20 0

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