SIMBAD references

1994A&A...291L..23G - Astronomy and Astrophysics, volume 291, L23-26 (1994/11-2)

A Keplerian disk around DM Tau?


Abstract (from CDS):

Using the IRAM 30-m telescope, we have detected a rotating gas disk around the relatively old (5x106yr) T Tauri star DM Tau. The kinematic pattern and line profiles obtained from 12CO J=2->1 and 13CO J=2->1 are consistent with a disk inclined about 30deg from face-on, with a rotation axis at PA~=90deg, and orbiting a 0.65M central star with a systemic velocity of 6.1km/s. All detected lines can be well fitted by a simple Keplerian disk model with outer radius ~=750AU, mean temperature about 15K, and standard isotopic ratios. If the CO abundance is normal, the total disk mass is 1.4x10–3M. Such a mass is small compared to that derived from mm and sub-mm continuum emission (~=0.03M). This can be explained either by CO depletion, or by an anomalous gas-to-dust ratio, or by the existence of a dense, compact, optically thick core which dominates the mm continuum emission. The size derived for such a core is consistent with the size of the current solar system. In all cases, our results indicate that significant amount of gas still exists several Myr after star formation.

Abstract Copyright:

Journal keyword(s): stars: individual: DM Tau - circumstellar matter - pre-main sequence - radio-lines: stars

Simbad objects: 5

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