Modelling of an Eclipsing RS CVn Binary: V405 And

Long-term chromospheric activity of non-eclipsing RS CVn-type stars

Context. The IUE database provides a large number of UV high and low-resolution spectra of RS CVn-type stars from 1978 to 1996. In particular, many of these stars were monitored continuously during several seasons by IUE. Aims. Our main purpose is to study the short and long-term chromospheric activity of the RS CVn systems most observed by IUE: HD 22468 (V711 Tau, HR 1099, K1IV+G5V), HD 21242 ...

Quiescent and Flaring Structure in Rs Cvn

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...

Musicos 1998: Observations of Rotational Modulation and Flares on the Rs Cvn Binary Hr1099

We present simultaneous and continuous observations of Hα, Hβ, Na I D 1 , D 2 , He I D 3 and Ca II H & K 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 and Ca II H & K, Hβ and He I D 3 and a strong filling-in of the Na I D 1 , D 2 during the flares are observed. We have found th...

VLA multifrequency observations of RS CVn binaries

We present multiepoch Very Large Array (VLA) observations at 1.4 GHz, 4.9 GHz, 8.5 GHz and 14.9 GHz for a sample of eight RS CVn binary systems. Circular polarization measurements of these systems are also reported. Most of the fluxes observed are consistent with incoherent emission from mildly relativistic electrons. Several systems show an increase of the degree of circular polarization with ...