1997A&A...326..195S


Query : 1997A&A...326..195S

1997A&A...326..195S - Astronomy and Astrophysics, volume 326, 195-202 (1997/10-1)

RX J2115.7-5840: a short-period, asynchronous polar.

SCHWOPE A.D., BUCKLEY D.A.H., O'DONOGHUE D., HASINGER G., TRUEMPER J. and VOGES W.

Abstract (from CDS):

We report phase-resolved optical polarimetric, photometric and spectroscopic observations of RX J2115.7-5840 (= EUVE J2115-58.6, Craig 1996) which confirms the system to be a magnetic cataclysmic binary of the polar (AM Herculis) subclass. The optical light curve is sometimes flat and occasionally displays a pronounced bright phase, reminiscent of the self-eclipse of a small accretion spot by the revolving white dwarf, as seen in self-eclipsing polars. Our period search reveals ambiguous results only which can be interpret assuming that the white dwarf is not synchronously rotating with the binary orbit. We find circularly polarized cyclotron radiation with V/I ranging from 0% to -15% on one occasion, from -8% to +15% on another occasion. Compared with other polars, the self-occulted accretion region of RX J2115.7-5840 had an extreme red cyclotron spectrum. In addition, the system has an extreme hard X-ray colour during the ROSAT all-sky survey observation. Both properties suggest a low value of the magnetic field strength, and our best estimate gives B = 11±2MG. Due to the absence of significant M-star features in our low-resolution spectra we estimate the minimum distance to RX J2115.7-5840 to be d>250pc (for an M5+ secondary star).

Abstract Copyright:

Journal keyword(s): accretion - cataclysmic variables - AM Herculis binaries - stars: individual: RX J2115.7-5840 (EUVE J2115-58.6)

Simbad objects: 7

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Number of rows : 7
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 V* BL Hyi CV* 01 41 00.3996430344 -67 53 27.470100660   14.9       Am 204 0
2 V* BY Cam CV* 05 42 48.8013535344 +60 51 31.376128608   16.60       ~ 242 0
3 V* EP Dra CV* 19 07 06.1869947064 +69 08 43.869784776   18       ~ 60 0
4 V* V1432 Aql CV* 19 40 11.4199326288 -10 25 25.771706256     14.40 15.437   ~ 154 0
5 V* V393 Pav CV* 19 57 11.5514523936 -57 38 22.427884104           ~ 26 0
6 V* V1500 Cyg No* 21 11 36.5809818696 +48 09 01.952490204           ~ 766 0
7 V* CD Ind CV* 21 15 41.0450813472 -58 40 54.058462428           ~ 84 0

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2022.05.24-08:51:25

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