Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983a%26a...121..217r&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 121, no. 2, May 1983, p. 217-225.
Astronomy and Astrophysics
Astrophysics
112
Stellar Evolution, Stellar Spectra, Stellar Spectrophotometry, T Tauri Stars, Variable Stars, Absorption Spectra, Emission Spectra, Line Spectra, Spectral Energy Distribution, Spectrum Analysis, Stellar Color, Visual Photometry
Scientific paper
A discussion is presented concerning the photometric variability of TW Hya on the basis of UBVRI observations obtained over 12 consecutive nights, as well as mean colors, JHKL observations employed to obtain the spectral energy distribution, and spectrograms covering the 3600-9000 A range. The spectra reveal the presence of the highly variable and strong emission of hydrogen, together with emission lines of He I, Ca II, Fe II, and O I. In combination with the strong color excesses noted in the visual region, the spectral features obtained suggest strong chromospheric activity in TW Hya. This star is exceptional in possessing all the properties of a classical T Tauri star while being located far from any dark cloud.
Krautter Joachim
Rucinski Slavek M.
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