2001A&A...376..448M


C.D.S. - SIMBAD4 rel 1.7 - 2020.10.25CET10:11:00

2001A&A...376..448M - Astronomy and Astrophysics, volume 376, 448-459 (2001/9-3)

Discovery of a cataclysmic variable with a sub-stellar companion.

MENNICKENT R.E., DIAZ M., SKIDMORE W. and STERKEN C.

Abstract (from CDS):

We find that the ROSAT source 1RXS J105010.3-140431 is a cataclysmic variable with orbital period of 88.6 min and a spectrum closely resembling WZ Sge. In particular, emission lines are flanked by Stark-broadened absorption wings probably originating in the photosphere of a compact object. The Balmer absorption lines can be modeled by the spectrum of a DA white dwarf with 13000<Teff<24000K. The strong absorption lines allowed us to obtain direct radial velocities of the white dwarf using the cross-correlation technique. We find an extremely low white dwarf radial velocity half amplitude, Kwd=4±1km/s. This is consistent with the upper limit obtained from the Hα emission line wing K<20km/s. The corresponding mass function is incompatible with a main sequence secondary, but is compatible with a post orbital period minimum cataclysmic variable with a brown dwarf-like secondary. The formal solution gives a secondary mass of 10-20 Jovian masses. Doppler maps for the emission lines and the hypothesis of black-body emission indicate a steady state (T∼r–3/4) accretion disk mainly emitting in Hα and an optically thicker hotspot with a strong contribution to the higher order Balmer lines and HeI 5875. As in other long cycle length dwarf novae, evidence for inner disk removal is found from the analysis of the emission lines.

Abstract Copyright:

Journal keyword(s): accretion, accretion disks - stars: binaries: close - stars: individual: 1RXS J105010.3-140431 - stars: novae, variables cataclysmic

Simbad objects: 11

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Number of rows : 11

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 V* LL And DN* 00 41 51.47 +26 37 20.9           ~ 57 0
2 CD-28 595 PM* 01 54 50.2704861570 -27 28 35.740415025   12.06 11.51     ~ 120 0
3 CPD-69 177 WD* 03 10 31.0201840720 -68 36 03.381441176 10.757 11.413 11.394 11.47 11.558 DA3.0 236 0
4 V* EF Eri NL* 03 14 13.2527107604 -22 35 42.917018996   15.4 14.53 13.5   ~ 410 0
5 V* V347 Pup Al* 06 10 33.6585438847 -48 44 25.363237509   13.95 13.57 13.24 12.79 M0.5V 85 0
6 LP 731-60 DN* 10 50 10.8033679538 -14 04 36.759700652     16.76     ~ 20 0
7 V* AL Com DN* 12 32 25.7949185878 +14 20 42.320230643     16.2     ~ 231 0
8 V* HV Vir DN* 13 21 03.1665682309 +01 53 29.071215583           DA 146 0
9 V* GW Lib DN* 15 19 55.3336459070 -25 00 24.613958659   9.0       ~ 181 0
10 V* V592 Her DN* 16 30 56.400 +21 16 58.49   12.00       ~ 51 0
11 V* WZ Sge DN* 20 07 36.5036203067 +17 42 14.733657651   15.30 15.20     DAepv 892 0

    Equat.    Gal    SGal    Ecl

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2020.10.25-10:11:00

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