Detection of rotational modulation in the coronal extreme-ultraviolet emission from V711 Tauri?

Details Detection of rotational modulation in the coronal extreme-ultraviolet emission from V711 Tauri? Detection of rotational modulation in the coronal extreme-ultraviolet emission from V711 Tauri?

Jan 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...421l..43d&link_type=abstract

Astrophysical Journal, Part 2 (ISSN 0004-637X), vol. 421, no 1, p. L43-L46

Astronomy and Astrophysics

Astronomy

26

Light Curve, Sky Surveys (Astronomy), Spatial Distribution, Stellar Coronas, X Ray Stars, Atmospheric Density, Exosat Satellite, Extreme Ultraviolet Explorer Satellite, Ginga Satellite, Iue, Line Of Sight, Spectrometers

Scientific paper

The RS CVn binary V711 Tauri was observed by the Extreme Ultraviolet Explorer satellite (EUVE) twice during the latter half of 1992, for periods lasting several days. Light curves for the waveband 60-180 A derived from the all-sky survey scanning in August and from a pointed calibration observation made in October both exhibit a modulation of about 40%. The modulation in both data sets is very similar, with minimum flux occurring near orbital phase phi = 0.5. Analysis using a two-temperature optically thin plasma emission model reveals that most of the detected extreme ultraviolet (EUV) flux emanates from hot (approximately 107 K) coronal plasma. The modulation is probably mostly due to either flare-like activity or to rotational occultation of a long-lived, compact, and especially bright coronal structure on the more active star of the system. The phased data support the latter hypothesis. This coronal structure is then likely to be associated with the presistent spot patterns seen on V711 Tau when using Doppler and photometric surface imaging techniques. Comparison with contemporaneous Stroemgren b-band photometry indicates that the optical minimum light leads the EUV maximum light by 90 deg in phase.

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