Ellipsoidal primary of the RS CVn binaryζ Andromedae

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 ...

Quiescent and Flaring Structure in Rs Cvn

A probable RS CVn star which sometimes stops its eclipses ⋆

We report the discovery of a new variable star, called S 10947 Aql, as the likely optical counterpart of RX J2009.8+1557. The optical variability pattern as well as the detected X-ray emission suggest that it is a chromospherically active binary of the RS Canum Venaticorum (≡ RS CVn) type. We discovered an occasional disappearance of the eclipsing minima as well as large variations in the eclip...

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...

Magnetic Activities in Outer Atmosphere of the RS CVn-type Binary SZ Psc

Abstract. We present the results of time-resolved high-resolution spectroscopic observations of the very active RS CVn-type star SZ Psc, obtained during two consecutive observing nights in 2011 October. Chromospheric activity indicators (including the Hα, Na i D1, D2, He i D3, and Hβ lines) formed at different atmospheric heights were analyzed using the spectral subtraction technique, which sho...