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A High Spatial Resolution Infrared View of the T Tauri Multiple System | Tracy L. Beck
; G. H. Schaefer
; M. Simon
; L. Prato
; J. A. Stoesz
; R. R. Howell
; | Date: |
15 Jun 2004 | Journal: | Astrophys.J. 614 (2004) 235-251 | Subject: | astro-ph | Affiliation: | 1 and 2), G. H. Schaefer , M. Simon , L. Prato , J. A. Stoesz , R. R. Howell ( Gemini Observatory, SUNY Stony Brook, UCLA, U. of Victoria, U. of Wyoming | Abstract: | We present the results of our monitoring study of the IR photometric and spectroscopic variability of the T Tau multiple system. We also present data on the apparent position of T Tau S with respect to T Tau N, and two new spatially resolved observations of the T Tau Sa-Sb binary. T Tau N has not varied by more than 0.2 magnitudes in K and L’ flux during the 8 years of our observations, though its Br gamma and Br alpha emission line fluxes have varied by nearly a factor of four during this time. For the unresolved T Tau S system, we have derived a 20 year light curve based on our images and on measurements available in the literature. T Tau S varies by 2-3 magnitudes in K and L’-band brightness in a ``redder when faint’’ manner, consistent with changes along the line of sight in the amount of material that follows an ISM extinction law. Absorption in the 3.05um water-ice feature is seen only in the spectra of T Tau S and it displays variations in depth and profile. H_2 (2.12 um) emission is also detected only at the position of T Tau S; the H_2, Br gamma and Br alpha emission line fluxes also vary. We have found that the apparent positions of T Tau S with respect to T Tau N and T Tau Sb with respect to Sa are consistent with gravitationally bound orbital motion. The possible orbits of the T Tau S binary imply that Sa is likely the most massive component in this young triple. A reanalysis of the motion of the radio source associated with T Tau S provides no evidence for an ejection event in the T Tau system. | Source: | arXiv, astro-ph/0406337 | Services: | Forum | Review | PDF | Favorites |
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