The ephemeris and variations of the accretion disc radius in IP Pegasi

Details The ephemeris and variations of the accretion disc radius in IP Pegasi The ephemeris and variations of the accretion disc radius in IP Pegasi

Aug 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989mnras.239..809w&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 239, Aug. 15, 1989, p. 809-824.

Physics

54

Accretion Disks, Dwarf Novae, Eclipsing Binary Stars, Ephemerides, Radii, Stellar Physics, Light Curve, Stellar Magnitude, Stellar Mass Ejection

Scientific paper

Timings of 37 previously unpublished eclipses of the dwarf nova IP Pegasi, obtained in 1986 through to 1988, are presented and combined with earlier published timings in order to update the orbital ephemeris and to examine the behavior of the accretion disk radius through the outburst cycle. The timings show that the orbital period is increasing rapidly with P/P = 400,000 yr. Possible explanations include a third body in the system, magnetic activity in the secondary star, or radius changes of the secondary star.

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