Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...242..428m&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 242, no. 2, Feb. 1991, p. 428-432.
Astronomy and Astrophysics
Astrophysics
45
Binary Stars, Infrared Imagery, Infrared Photometry, T Tauri Stars, Color-Color Diagram, Color-Magnitude Diagram, Companion Stars
Scientific paper
Near infrared photometry of the individual components of seven visual pairs and two triple systems with a T Tauri primary indicates that in two of the pairs, the 'companions' are background field stars, while in the remaining systems the companions have colors and magnitudes similar to those of T Tauri stars, and are therefore presumably physical companions. In contrast to main sequence stars, the primary in most systems is redder. This redness is interpreted in terms of infrared excess emission arising from a circumstellar disk, which at an early age of the system is much stronger for the primaries, but which must also disappear by the time the components reach the main sequence. Comparison of the binary components to presumably single T Tauri stars shows that for these wide binaries, interactions do not seem to play a significant role in the dissipation of their infrared excess, and hence of the disks. Thus the results of differential studies of sufficiently wide binaries should also be applicable to single T Tauri stars.
Moneti Andrea
Zinnecker Hans
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