YY-Orionis stars - an interesting group of the T-Tauri stars

Details YY-Orionis stars - an interesting group of the T-Tauri stars YY-Orionis stars - an interesting group of the T-Tauri stars

Aug 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977s%26w....16..234m&link_type=abstract

Sterne und Weltraum, vol. 16, July-Aug. 1977, p. 234-240. In German.

Computer Science

Stellar Evolution, Stellar Spectra, T Tauri Stars, Emission Spectra, Orion Constellation, Stellar Models, Stellar Spectrophotometry, Ubv Spectra, Variable Stars

Scientific paper

The T-Tauri stars have first been recognized by Joy (1945/49) as a special class of variable stars which show pronounced emission lines and are associated with dark cloud complexes. They are currently considered as pre-main-sequence stars with an age of about 1,000,000 years. According to spectroscopic criteria, all YY-Ori stars which are presently known belong to the T-Tauri stars. Photometric data of the 15 known YY-Ori stars are presented in a table. Attention is given to the spectral characteristics of the stars, the model of a YY-Ori star, the causes of the UV excess, the frequency of an occurrence of YY-Ori stars among the T-Tauri stars, and the state of development of the T-Tauri stars.

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