Garcia-Alvarez, David

Contact Email: dga@star.arm.ac.uk
Institute: Armagh Observatory
First Coauthor: BERNARD H.FOING
Institute: RESEARCH DIVISION, ESA SPACE SCIENCE DEPARTMENT
Second Coauthor: D. MONTES
Institute: DEPARTAMENTO DE ASTROFISICA, FALCULTAD DE CIENCIAS UNIVERSIDAD COMPLUTENSE DE MADRID, SPAIN
Research URL:http://www.arm.ac.uk/staff/dga.html
Presenting Thesis: Yes
Subject Area: Binary Stars: Non-interacting
Waveband: Optical
Technique: Spectroscopy
Presentation: Poster Display
Title: MUSICOS 1998: Observations of the Rotational Modulation and Flares of the RS CVn Binary HR1099 (V711 Tau)
Abstract: We present the simultaneous and continuous observations of $H\alpha$, $H\beta$, He D3, NaI Doublet, Ca II H & K, and Ca II IRT lines of the chromospherically active binary HR1099 (V711). It is one of the most active RSCVn spectroscopic binary systems ( P_rot=2^d.8 ) with G5V/K1IV components. Its tidally induced rapid rotation, combined with the deepened convection zone of a post main sequence envelope, is responsible for the very high chromospheric activity for its spectral class. The primary (K1IV) shows very strong and variable CaII H & K and $H\alpha$ emission that is indicative of high chromospheric activity. The spectroscopic observations have been obtained during the MUSICOS 1998 campaign involving OHP, SAAO, La Palma, Kitt Peak, ESO La Silla, Mt Stromlo, Xinglong and LNA, using both Echelle and Long Slit Spectrographs. We have observed HR1099 for more than 3 weeks almost continuously and monitored two flares. Increase in $H\alpha$ and Ca II H & K emission, emission in $H\beta$and He D3 and a strong filling-in of the NaI Doublet during the flares have been reported. We have found that the flares took place at the same phase (0.85) of the binary orbit. [Co-authors: J. Oliveira and MUSICOS 1998 Collaboration]