Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aj....103..953g&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 103, March 1992, p. 953-959.
Astronomy and Astrophysics
Astronomy
21
Companion Stars, Infrared Astronomy, Pre-Main Sequence Stars, Speckle Interferometry, T Tauri Stars, Faint Objects, Herbig-Haro Objects, Stellar Color, Stellar Luminosity, Visible Spectrum
Scientific paper
Speckle interferometric observations of the premain-sequence stellar system T Tauri at 650 and 800 nm, and at 1.6 (H) and 2.2 microns (K) in the IR using the Palomar 200-in. telescope yield no evidence for a tertiary optical companion star as reported in 1985. The present observations were of sufficient sensitivity to have detected the object unambiguously if it had remained at its reported brightness and color. The IR results provide particularly stringent limits on the presence of a third star in the system, since both the optical and southern IR component are clearly resolved to the diffraction limit of the 200-in. telescope, including the H band where the southern component appeared about 5 mag fainter than the optical primary. Possible resolutions to the conflicting results concerning this object are discussed, and it is concluded that if the star is bound to the T Tau system, it has dimmed by at least 1-3 mag at R, I, H, and K. The star is unlikely to be a normal M dwarf as reported, and the possibility that the star could be a Herbig-Haro object is discussed.
Ghez Andrea M.
Gorham Peter. W.
Haniff Christopher A.
Kulkarni Sanjeev R.
Matthews Keith
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