GHRS Spectra of the Active Chromosphere Binary V711 Tau (HR 1099)

Details GHRS Spectra of the Active Chromosphere Binary V711 Tau (HR 1099) GHRS Spectra of the Active Chromosphere Binary V711 Tau (HR 1099)

May 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994aas...184.0514d&link_type=abstract

American Astronomical Society, 184th AAS Meeting, #05.14; Bulletin of the American Astronomical Society, Vol. 26, p.865

Astronomy and Astrophysics

Astronomy

Scientific paper

During a multiwavelength campaign in September of 1993 a unique array of telescopes was directed at the chromospherically-active binary system V711 Tau (HR 1099) in an effort to determine fundamental properties of a late-type stellar atmosphere from the photosphere to the corona. Observations of the RS CVn system V711 Tau were obtained with the HST, IUE, VLA, and EUVE observatories. In addition, ground-based optical spectroscopy and photometry were obtained with the APT in Phoenix and at Penn State's Black Moshannon Observatory. We present preliminary results from GHRS observations obtained at 5 phases over 2.5 stellar rotations. GHRS spectra of Mg II h & k (2796, 2830 Angstroms)\ and the C IV doublet (1548,1550 Angstroms)\ are used to probe the chromosphere and transition regions of the K1 IV star, while electron density diagnostics are extracted from the Si III] (1892 Angstroms)\ and C III] (1909 Angstroms)\ intersystem lines. Additional spectra of the 2600 Angstroms region and H I Lyman-alpha spectral regions were obtained at one quadrature phase. Although phase coverage is poor, we are able to extract limited information on temporal and/or spatial variability of the system. Changes in line flux and profile shape are observed in several lines including a variation of approximately 60% in the Si III]/C III] ratio. Finally, since V711 Tau has been observed extensively by IUE over the past 16 years, the HST data provide a high resolution benchmark for this larger body of data.

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