Search for new T Tauri stars in the Cepheus-Cassiopeia region

Free access article

Issue		A&A Volume 437, Number 3, July III 2005


Page(s)		919 - 928
Section		Interstellar and circumstellar matter
DOI		http://dx.doi.org/10.1051/0004-6361:20042197

A&A 437, 919-928 (2005)
DOI: 10.1051/0004-6361:20042197

Search for new T Tauri stars in the Cepheus-Cassiopeia region

K. Tachihara¹, R. Neuhäuser¹, M. Kun² and Y. Fukui³

¹ Astrophysikalisches Institut und Universitäts-Sternwarte Jena, Schillergäßchen 2-3, 07745, Jena, Germany
e-mail: tatihara@astro.uni-jena.de
² Konkoly Observatory of Hungarian Academy of Sciences, Budapest, Hungary
³ Department of Astrophysics, Nagoya University, Chikusa-ku, Nagoya, 464-8602, Japan

(Received 18 October 2004 / Accepted 18 February 2005 )

Abstract
The Cepheus-Cassiopeia star-forming region has been searched for new T Tauri stars (TTSs) based on the ROSAT all sky survey (RASS). Optical spectroscopic observations were carried out toward 45 GSC stellar counterparts of RASS sources looking for the Li absorption line (6708 Å), a sign of youth. The detection of this line resulted in finding 11 to 16 new TTSs in this region. Using follow-up optical photometric observations and evolutionary models these Li-rich stars are revealed to be young low-mass stars. The most of the young stars are separated from the $\element[][13]{CO}$ molecular clouds by ~10 pc, significantly more than in Chamaeleon . A group of the new TTSs are isolated from the CO clouds and distributed inside the previously determined CO void. Possible formation scenarios including the interaction with the supernova shock for the isolated TTSs are discussed.

Key words: ISM: clouds -- ISM: molecules -- stars: formation -- stars: late-type -- stars: pre-main sequence -- X-rays: stars

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