Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993a%26a...278..129l&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 278, no. 1, p. 129-149
Astronomy and Astrophysics
Astronomy
389
Binary Stars, Pre-Main Sequence Stars, Sky Surveys (Astronomy), Taurus Constellation, Main Sequence Stars, Spatial Distribution, Star Formation, Stellar Evolution
Scientific paper
We surveyed all those young stars in the Taurus star forming region for duplicity which are contained in the Herbig-Bell catalog and are brighter than K = 9.5 mag, in total a sample of 104 systems. The range in separation observed is 0.13 - 13 arcsec, with the lower limit given by the diffraction limit of the telescope and the upper limit by confusion due to the surface density of background stars. Within this range we found 39 systems to be double (of which 24 are new detections), 3 triples and 2 quadruples. The resulting degree of multiplicity of 44/104 = 42 +/- 6% is higher than found for main sequence solar type field stars for the same interval of separation (Duquennoy & Mayor 1991) by a factor of 1.9 +/- 0.3. We suggest two possible lines of interpretation: If the distribution with separation is similar for young stars and for main sequence stars, this result is compatible with the assumption that all young stars are born double. On the other hand, if one assumes that the total degree of duplicity is about the same in both the sample of main sequence stars and in the sample of pre-main sequence stars, then the distribution with separation must be quite different for these two samples. In either case we have evidence for evolution of the binary properties before the systems reach the main sequence. However, these conclusions hold only if our census in Taurus is typical for the average star forming region. In our sample, multiplicity occurs with the same frequency for weak-lined as for classical T Tauri stars.
Christou Julian
Haas Marcel
Jameson Richard
Leinert Ch.
Lenzen Rainer
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