1999MNRAS.309..847P

Query : 1999MNRAS.309..847P

1999MNRAS.309..847P - Mon. Not. R. Astron. Soc., 309, 847-861 (1999/November-2)

Optical and ROSAT X-ray observations of the dwarf nova OY Carinae in superoutburst and quiescence.

PRATT G.W., HASSALL B.J.M., NAYLOR T., WOOD J.H. and PATTERSON J.

Abstract (from CDS):

We present ROSAT X-ray and optical light curves of the 1994 February superoutburst of the eclipsing SU UMa dwarf nova OY Carinae. There is no eclipse of the flux in the ROSAT HRI light curve. Contemporaneous `wide B'-band optical light curves show extensive superhump activity and dips at superhump maximum. Eclipse mapping of these optical light curves reveals a disc with a considerable physical flare, even three days into the superoutburst decline.

We include a later (1994 July) ROSAT PSPC observation of OY Car that allows us to put constraints on the quiescent X-ray spectrum. We find that while there is little to choose between OY Car and its fellow high-inclination systems with regard to the temperature of the emitting gas and the emission measure, we have difficulties reconciling the column density found from our X-ray observation with the column found in Hubble Space Telescope UV observations by Horne et al. The obvious option is to invoke time variability.


Abstract Copyright: 1999, Royal Astronomical Society

Journal keyword(s): accretion, accretion discs - binaries: eclipsing - stars: individual: OY Car - novae, cataclysmic variables - X-rays: stars

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 - 2026 		#notes
1 V* HT Cas CV* 01 10 13.1213394144 +60 04 35.489642700     14.10     M5.5e 401 0
2 V* VW Hyi CV* 04 09 11.3967378648 -71 17 41.554528260   12.786 12.543 14.160   DQ 661 0
3 V* U Gem CV* 07 55 05.2324414746 +22 00 05.044127985   15.3 14.54     DA 1135 0
4 V* Z Cha CV* 08 07 27.7517751528 -76 32 00.665029356           M5.5 620 1
5 V* OY Car CV* 10 06 22.0793274312 -70 14 04.584660540           ~ 586 0
6 V* UX UMa CV* 13 36 40.9531256400 +51 54 49.423353228   12.78 13.26     sdOB 556 0
7 V* WZ Sge CV* 20 07 36.5037622512 +17 42 14.733254952   15.30 15.20 10.817   D 982 0

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