Query : 2000A&A...358..600T

2000A&A...358..600T - Astronomy and Astrophysics, volume 358, 600-604 (2000/6-2)

A newly-discovered cataclysmic binary near the ROSAT galactic plane source RXJ1910.8+2856.


Abstract (from CDS):

We report the discovery of a new cataclysmic binary star from the ROSAT Galactic Plane Survey. The star has V>18.5 at minimum light and we have measured it as bright as V=15.7. Spectroscopy shows broad hydrogen and helium emission lines; HeII λ 4686 is not detected. Hα radial velocities yield an orbital period of 0.1429±0.0004d (3.430±0.010h). Time-series photometry covering one orbital cycle near maximum light shows irregular variability, but no evidence of an eclipse. The system appears to be a new dwarf nova of the U Gem or Z Cam type, and is unlikely to be a magnetic system. Its period is unusually short for a U Gem star. Curiously, the new cataclysmic binary is 83'' from the original ROSAT PSPC survey position, which puts it outside the PSPC positional uncertainty. Follow-up observations with the HRI reveal that the PSPC source is the superposition of two sources, and the cataclysmic is much the weaker of the two in X-rays. Its discovery in this survey is therefore essentially accidental. A V=19.4mag star is located 1.2'' from the stronger source's HRI position.

Abstract Copyright:

Journal keyword(s): stars: binaries: close - stars: individual: RX J1910.8+2856 - stars: individual: RX J191059.6+285639 - stars: novae, cataclysmic variables - X-rays: stars

Nomenclature: Fig.1: [TH2000] Star NN (Nos 1-13), [TH2000] Star A (Nos A-C). Table 1: [TH2000] Source N (Nos 1-2).

Status at CDS : All or part of tables of objects will not be ingested in SIMBAD.

Simbad objects: 3

goto View the references in ADS

Number of rows : 3
N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
1 V* BX Pup CV* 07 54 15.5733669984 -24 19 36.404794884           ~ 39 0
2 [TH2000] Source 1 X 19 10 52.35 +28 56 24.1           ~ 1 0
3 V* V584 Lyr CV* 19 10 59.41 +28 56 38.7           ~ 9 0

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