Prominence detection and chromosphere feature on the prototype RS CVn of active binary systems

Abstract

We present a study of high-resolution spectra of RS Canum Venaticorum (RS CVn), a prototype of active binary systems. Our data were obtained from 1998 to 2017 using different telescopes. We analyze the chromospheric activity indicators Ca II IRT, H${}_{\alpha }$, Na I D${}_1$, D${}_2$ doublet, He I D${}_3$, and H${}_{\beta }$ using a spectral subtraction technique. The chromospheric emission stems mainly from the K2 IV primary star, while the F5 V secondary star only shows weak emission features in a few of our spectra. We find excess absorption features in the subtracted H${}_{\alpha }$ lines and other activity indicators from spectra taken near primary eclipse, which we ascribe to prominence-like material associated with the primary star. We estimate size limits of these tentative prominences based on the geometry of the binary system, and investigate the physical properties of the strongest prominence. An optical flare, characterized by He I D${}_3$ line emission, together with stronger emission in other activity lines, was detected. The flare energy is roughly comparable to strong flares observed on other RS CVn-type stars. The chromospherically active longitudes of RS CVn most frequently appear near the two quadratures of the system and display changes between observing runs, which indicates an ongoing evolution of its active regions.

References in corpus (16)

• Multiwavelength optical observations of chromospherically active binary systems. III. High resolution echelle spectra from Ca II H&K to Ca II IRT
• Multiwavelength optical observations of chromospherically active binary systems. I. Simultaneous H{alpha}, NaI D{1}, D{2}, and HeI D{3} observations
• Optical and UV observations of a strong flare in the young, single K2-dwarf LQ Hya
• Spots, plages, and flares on lambda Andromedae and II Pegasi
• Simultaneous Optical and X-ray Observations of Flares and Rotational Modulation on the RS CVn Binary HR 1099 (V711 Tau) from the MUSICOS 1998 Campaign
• Rotational modulation of the photospheric and chromospheric activity in the young, single K2-dwarf PW And
• Long-term magnetic activity in close binary systems. I. Patterns of color variations
• The coronal structure of Speedy Mic - II: Prominence masses and off-disc emission
• The coronal structure of Speedy Mic - I: A densely packed prominence system beyond co-rotation
• Prominence activation, optical flare, and post-flare loops on the RS Canum Venaticorum star SZ Piscium
• Indications of stellar prominence oscillations on fast rotating stars: the cases of HK Aqr and PZ Tel
• Chromospheric activity on late-type star DM UMa using high-resolution spectroscopic observations
• The first Doppler imaging of the active binary prototype RS Canum Venaticorum
• WES - Weihai Echelle Spectrograph
• The behaviour of the excess CaII H & K and H_epsilon emissions in chromospherically active binaries
• Simultaneous H$\alpha$, Na~{\sc i} D${}_1$, D${}_2$, and He~{\sc i} D${}_3$ observations of a flare on the RS CVn system UX Ari

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• Red Asymmetry of H${}_{\alpha }$ Line Profiles during the flares on the active RS CVn-type star II Pegasi
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• iSTARMOD: A Python Code to Quantify Chromospheric Activity by Using the Spectral Subtraction Technique