Selected EUVE Timing Results on AM Herculis Binaries

Details Selected EUVE Timing Results on AM Herculis Binaries Selected EUVE Timing Results on AM Herculis Binaries

Dec 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998aas...19310303c&link_type=abstract

American Astronomical Society, 193rd AAS Meeting, #103.03; Bulletin of the American Astronomical Society, Vol. 30, p.1404

Astronomy and Astrophysics

Astronomy

Scientific paper

We present Extreme Ultraviolet Explorer (EUVE) timing results for AM Her, VV Pup, and EUVE J2115-586. We obtained an EUVE target of opportunity observation of AM Her in a high accretion state between 04 August 09:42 -05 August 12:28 1998 UT. The Deep Survey (DS) Lexan filter ( ~ 100 Angstroms) count rate was 2.57+/-0.05 cts/sec. This observation was made simultaneously with Rossi-XTE with the goal of testing correlations in the EUV and X-ray bands. We will present EUVE and RXTE PCA phased light curves and timing studies. We have searched archival EUVE data of VV Pup (February 1993) for the 1-3 sec optical quasi-periodic oscillations (QPO). We found no significant features in the 0.3-1.0 Hz range for the total light curve and light curves separated as a function of orbital phase. We also searched archival EUVE data of AM Her (September 1993 and March 1995) for the ~ 6 minute QPO reported by Stella et al. 1986 using Einstein observations. All features found in the ~ 6 minute range are higher harmonics of the beating between the AM Her and EUVE orbital periods. We also present our October 1997 EUVE observation of asynchronous polar EUVE J2115-586. The source was in a low state with a DS Lexan count rate of 7+/-3 cts/ksec. The EUVE light curve favors a period of 110.4 minutes, similar to the one derived from optical observations by Vennes et al. 1997, but further observations are needed. This research is supported by NASA Grant NAG5-7013.

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