Prominence activation, optical flare, and post-flare loops on the RS Canum Venaticorum star SZ Piscium

Abstract

We present the results of time-resolved high-resolution spectroscopic observations of the very active RS Canum Venaticorum (RS CVn) star SZ Piscium (SZ Psc), obtained during two consecutive observing nights on October 24 and 25, 2011. Several optical chromospheric activity indicators are analyzed using the spectral subtraction technique, which show the remarkably different behavior between two nights. Gradually blue-shifted and strengthened excess absorption features presented in the series of the subtracted spectra (especially for the H${}_{\alpha }$, He I D${}_3$ and H${}_{\beta }$ lines), as a result of active stellar prominence that is rising its height along the line of our sight, was detected in the observations on October 24. This prominence activation event was probably associated with the subsequently occurred optical flare, and part of that flare decay phase was hunted in the observations on October 25. The flare was characterized by the prominent He I D${}_3$ line emission, as well as stronger chromospheric emission in the H${}_{\alpha }$, H${}_{\beta }$ and other active lines. The gradual decay of flare was accompanied by an obviously developmental absorption feature in the blue wing of the H${}_{\alpha }$ and other active lines, which could be explained as cool post-flare loops which projected against the bright flare background. Therefore, a series of possibly associated magnetic activity phenomena, including flare-related prominence activation, optical flare and post-flare loops, were detected during our observations.

References in corpus (5)

• Spots, plages, and flares on lambda Andromedae and II Pegasi
• Long-term magnetic activity in close binary systems. I. Patterns of color variations
• Doppler imaging an X-ray flare on the ultrafast rotator BO Mic - A contemporaneous multiwavelength study using XMM-Newton and VLT
• Multiwavelength optical observations of two chromospherically active binary systems: V789 Mon and GZ Leo
• Chromospheric activity on late-type star DM UMa using high-resolution spectroscopic observations

Cited by in corpus (9)

• Possible detection of coronal mass ejections on late-type main-sequence stars in LAMOST medium-resolution spectra
• Swift and XMM-Newton observations of an RS CVn type eclipsing binary SZ Psc: Superflare and coronal properties
• Red Asymmetry of H${}_{\alpha }$ Line Profiles during the flares on the active RS CVn-type star II Pegasi
• LAMOST medium-resolution observations of the Pleiades
• Prominence detection and chromosphere feature on the prototype RS CVn of active binary systems
• Magnetic activities on two single-lined RS Canum Venaticorum binaries IM Pegasi and $\sigma$ Geminorum
• Further Investigation on Chromospheric Activity Patterns of the RS Canum Venaticorum Star V711 Tauri
• Doppler-shifted Signatures in the Chromospheric Line Profiles of II Pegasi
• An investigation of the magnetic activity of HD 134319 based on TESS photometry and ground-based spectroscopy