Variability of the hydrogen and calcium emission in the spectrum of SU AUR

Details Variability of the hydrogen and calcium emission in the spectrum of SU AUR Variability of the hydrogen and calcium emission in the spectrum of SU AUR

Jan 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985afz....22...43g&link_type=abstract

(Astrofizika, vol. 22, Jan.-Feb. 1985, p. 43-49) Astrophysics (ISSN 0571-7132), vol. 21, no. 1, July 1985, p. 24-28. Translation

Astronomy and Astrophysics

Astrophysics

1

Emission Spectra, H Alpha Line, Stellar Envelopes, Stellar Spectra, T Tauri Stars, Variable Stars, Absorption Spectra, H Lines, K Lines, Radial Velocity, Spectral Line Width, Stellar Flares, Stellar Mass Ejection

Scientific paper

Monitoring spectral observations carried out in the Crimea and at the Shemakha Astrophysical Observatory have revealed the following properties of the variability of the emission spectrum in the T Tau star SU Aur: (1) the appearance of absorption in the long-wave wing of H-alpha, which indicates the falling of gas onto the star; (2) a sharp increase in the emission in the line H-alpha on the night of Oct. 11-12, 1982, accompanied by the expulsion of gas from the star; and (3) variability of the calcium emission with a characteristic time of the order of one hour. There is a brief discussion of the nature of the variability.

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