2022A&A...661A..43S


Query : 2022A&A...661A..43S

2022A&A...661A..43S - Astronomy and Astrophysics, volume 661A, 43-43 (2022/5-1)

Discovery of eRASSt J192932.9-560346: A bright, two-pole accreting, eclipsing polar.

SCHWOPE A., BUCKLEY D.A.H., MALYALI A., POTTER S., KONIG O., ARCODIA R., GROMADZKI M. and RAU A.

Abstract (from CDS):

We report the discovery of a bright (V ∼ 15), eclipsing, two-pole accreting magnetic cataclysmic variable (CV), a polar, as counterpart of the SRG/eROSITA and Gaia transients eRASSt J192932.9-560346 and Gaia21bxo. Frequent large-amplitude changes of its brightness at X-ray and optical wavelengths by more than four magnitudes are indicative of a CV nature of the source. Identification spectra obtained with the 10m SALT telescope revealed the typical features of a magnetic CV: strong, broad HeI, HeII, and hydrogen Balmer emission lines superposed on a blue continuum. Time-resolved photoelectric polarimetry revealed that the circular polarization varies from -20 to +20% and the linear polarization varies from 0 to 10%, confirming the system to be a magnetic CV of the polar subclass. High-cadence photometry revealed deep, structured eclipses, indicating that the system is a two-pole accretor. The orbital period determined from the eclipse times is 92.5094 ± 0.0002 min. The X-ray spectrum is thermal only, and the implied luminosity is LX = 2.2 x 1031 erg s–1 at the Gaia-determined distance of 376 pc.

Abstract Copyright: © ESO 2022

Journal keyword(s): stars: individual: eRASSt 192932.9-560346 - X-rays: stars - novae, cataclysmic variables

Simbad objects: 6

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Number of rows : 6
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* EF Eri CV* 03 14 13.2526234800 -22 35 42.900077688   15.4 14.53 13.5   ~ 422 0
2 V* UZ For CV* 03 35 28.6518733656 -25 44 21.768755424           M4.5 256 0
3 V* AR UMa CV* 11 15 44.5891034908 +42 58 22.431026739     16.4     D+M 134 0
4 V* AM Her CV* 18 16 13.2546725112 +49 52 04.759613544   15.124 14.808 13.525   M4.5-5Ve 936 0
5 2MASS J19293303-5603434 CV* 19 29 33.0419357870 -56 03 43.027477876         16.382 ~ 1 0
6 V* HU Aqr CV* 21 07 58.1944529400 -05 17 40.557671916   16.198 15.814 14.891   D+M4V 264 1

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2022.08.09-16:42:55

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