Computer Science
Scientific paper
May 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997phdt........42k&link_type=abstract
Ph.D. thesis, Univ. Heidelberg, (1997)
Computer Science
4
Scientific paper
We present the results of a multiplicity survey of X-ray-selected T Tauri stars in the nearby star-forming regions Taurus-Auriga and Scorpius-Centaurus. All of the stars were observed at K (2.2 μm) using 2-dimensional speckle interferometry and direct imaging. Our observations of 74 stars in Taurus-Auriga were sensitive to all companions in the separation range 0.13" to 13" and up to a magnitude difference of 2.5 mag. We discovered 39 companion stars. Combined with the results of the preceding survey by Leinert et al. (1993), we find 48.3+/-15.3 companions per 100 systems, about twice as much as among solar-type main-sequence stars in the corresponding range of orbital periods. We find no difference in the multiplicity of classical and weak-line T Tauri stars. Our observations of 111 stars in Scorpius-Centaurus were sensitive to all companions in the separation range 0.13" to 3" and up to a magnitude difference of 2.0 mag. We discovered 34 companion stars, corresponding to (27.1+/-15.0) companions per 100 systems. This is about a factor of 1.5 more than the binary star frequency of solar-type main-sequence stars. We propose that the observed difference in multiplicity is caused by different environmental conditions in the two star-forming regions.
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