HR 1099 : a new bright RS CVn variable.

A Study of the Coronal Plasma in RS CVn binary systems : HR 1099 and co

XMM-Newton has been performing comprehensive studies of X-ray luminous RS CVn binary systems in its calibration and guaranteed time programs. We present results from ongoing investigations in the context of a systematic study of coronal emission from RS CVns. We concentrate here on coronal abundances and investigate the abundance pattern in RS CVn binaries as a function of activity and average ...

Musicos 1998: Optical and X-rays Observations of Flares on the Rs Cvn Binary Hr 1099

We present simultaneous and continuous observations of Hα, Hβ, Na i D1, D2 and He i D3 lines of the chromospherically active binary HR 1099. We have observed HR 1099 for more than 3 weeks almost continuously and monitored two flares. An increase in Hα, Ca ii H & K, Hβ, Hei D3 and Hei λ6678 and a strong filling-in of the Nai D1, D2 and Mgi b triplet during one of the flares are observed. We have...

Doppler Images of the RS CVn Binary HR 1099 ( V 711 Tau ) from the MUSICOS 1998 Campaign ⋆

We present Doppler Images of the RS CVn binary system HR 1099 (V711 Tau) from spectra taken in two different sites, KPNO and MSO, during the MUSICOS 1998 campaign. Contemporaneous APT photometry is used to constrain the Doppler Images. The resulting maximum entropy reconstructions based on the least-squares deconvolved profiles, derived from ∼2000 photospheric absorption lines, reveal the prese...

VLBI imaging of the RS CVn binary star system HR 5110

We present VLBI images of the RS CVn binary star HR 5110 (=BH CVn; HD 118216), obtained from observations made at 8.4 GHz on 1994 May 29/30 in support of the NASA/Stanford Gravity Probe B project. Our images show an emission region with a core-halo morphology. The core was 0.39 ± 0.09 mas (FWHM) in size, or 66%±20% of the 0.6 ±0.1 mas diameter of the chromospher-ically active K subgiant star in...

Quiescent and Flaring Structure in Rs Cvn