A Search for Phase-Dependent Asymmetries in the MG II H and K Lines of V711 Tau

Details A Search for Phase-Dependent Asymmetries in the MG II H and K Lines of V711 Tau A Search for Phase-Dependent Asymmetries in the MG II H and K Lines of V711 Tau

Dec 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aas...181.5110m&link_type=abstract

American Astronomical Society, 181st AAS Meeting, #51.10; Bulletin of the American Astronomical Society, Vol. 24, p.1207

Astronomy and Astrophysics

Astronomy

Scientific paper

V711 Tauri (HR 1099 ; G5 IV + K1 IV) is a bright, non-eclipsing RS CVn-type system. This summer, we analyzed a set of LWP high-dispersion spectra of V711 Tau that was obtained with the International Ultraviolet Explorer satellite in December 1984. These spectra form a unique data set, because this was the only time that V711 Tau was observed continuously throughout its 2.8 day period. Variations in chromospheric surface brightness on a star will produce an asymmetric Mg II emission line profile. Such variations could be short-lived (flares) or stable for many rotations (plages). In order to measure the asymmetries, we impose a partially-constrained, multi-gaussian fit on the Mg II h and k emission lines from the stellar chromospheres. We will describe this procedure in more detail and justify the constraints that we applied. V711 Tau undergoes occasional flaring episodes in all wavelength bands, and it is the proto-typical Doppler imaging candidate. Unfortunately, the chromospheres of V711 Tau showed no detectable non-uniformity and no appreciable variability during the December 1984 observing run. A multi-wavelength observing campaign of V711 Tau, including IUE spectra, radio interferometry, ground-based spectroscopy, and optical photometry, will be carried out in December 1992. This work was completed while the first author was an REU summer student at Penn State University.

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