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Title:
Spectral observations of flare stars TZ ARI and ROSS 867
Creator:
Kostandian, G. R. ; Melikian, N. D. ; Natsvlishvili, R. Sh. ; Paronyan, G. M.
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Uncontrolled Keywords:
variable star ; T Tau stars ; UV Ceti stars ; spectroscopy ; TZ ARI ; Ross 867B
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Abstract:
The results of spectral observations of are stars TZ Ari and Ross 867B are presented. Observations have been carried out by the 2.6m telescope of Astrophysical Byurakan Observatory in 1999, 2001 and 2018. The spectral cameras "ByuFOSC" and "SCORPIO" were used during the observations. A strong change of emission lines detected on TZ Ari in 2018, while at the same time the brightness changes of the star in all measured spectral ranges are within the framework of measurement errors. Slight variations of brightness and EWHα are detected in quiescent state of star during the observations in 1999. A strong are of Ross 867B were observed, with a duration of more than 20min. In this case if EWHβ shows strong change, when its maximum value corresponds to the photometric maximum of are, at the same time EWHα shows decrease, similar to that, observed earlier during the ares of stars EV Lac, HU Del, CM Dra and WX UMa.