Query : 2003A&A...402.1003D

2003A&A...402.1003D - Astronomy and Astrophysics, volume 402, 1003-1011 (2003/5-2)

The BP Tau disk: A missing link between Class II and III objects ?


Abstract (from CDS):

We present new single-dish (30-m) observations and an improved analysis of our earlier interferometric observations (Simon et al., 2000ApJ...545.1034S) of BP Tau. Our analysis yields a detailed description of the properties of the circumstellar disk. The disk is small (outer radius 120AU) and marginally optically thick in the 12CO J=2->1 line. It is also relatively hot, about 50K at 100AU. The mm continuum emission is consistent with a thermal emission from circumstellar dust with an emissivity index β ≃0.7, and a disk mass about 1.2x10–3M. The anomalously low 12CO to dust emission ratio implies that either CO is depleted by a factor of the order of 150 with respect to H2, or has a very low gas to dust ratio, or highly anomalous dust properties. The disk exhibits direct evidence of Keplerian rotation, but because of a combination of insufficient resolution and optically thin CO emission, the mass derived for the star remains inaccurate (between 0.6 and 1.3M for 140pc). The unusual properties of the circumstellar disk suggest that BP Tau may be a transient object in the process of clearing its disk.

Abstract Copyright:

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

Simbad objects: 3

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Number of rows : 3
N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
1 V* BP Tau Or* 04 19 15.8339827632 +29 06 26.926959492   13.13 12.12 11.89   K5/7Ve 634 0
2 V* DM Tau Or* 04 33 48.7336763736 +18 10 09.973460280 14.30 14.82 14.00     M2Ve 581 0
3 V* GM Aur Or* 04 55 10.9815576936 +30 21 59.373771876 14.59 13.351 12.242 11.798   K3Ve 617 0

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