Continuous Coverage of HR 1099 with IEU During the MUSICOS 1992 Campaign

Details Continuous Coverage of HR 1099 with IEU During the MUSICOS 1992 Campaign Continuous Coverage of HR 1099 with IEU During the MUSICOS 1992 Campaign

Jan 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994psu..rept.....n&link_type=abstract

Technical Report, Pennsylvania State Univ. University Park, PA United States

Physics

Eclipsing Binary Stars, Stellar Rotation, Astronomical Observatories, Stellar Activity, Ultraviolet Spectroscopy, Stellar Physics, Photometry, Iue, Magnetic Fields, Radio Observation

Scientific paper

Using the International Ultraviolet Explorer, we observed the bright RS CVn-type system HR 1099 (V711 Tau) continuously for two contiguous orbital/rotational cycles (Period-2.83 days) in December 1992. We are thus able to discriminate changes in the ultraviolet line fluxes and line profiles that are induced by stellar rotation from those that are sporadic (e.g. flares). These observations were coordinated with the 1992 campaign for Multi-Site Continuous Spectroscopy (MUSICOS). Supporting photometric and radio observations also were obtained simultaneously. We discuss the success of the observing campaign and present preliminary results from the ultraviolet spectroscopy. Our observations constrain the rise and decay phases of five flares, their energetics, and the dynamics within the flaring plasma. There was no rotational modulation of the ultraviolet emission line fluxes, but the Mg-II line wings were variable.

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