2003A&A...402.1003D


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.16CEST15:25:47

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 ?

DUTREY A., GUILLOTEAU S. and SIMON M.

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)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 V* BP Tau Or* 04 19 15.8342975037 +29 06 26.929456808   13.13 12.12 11.89   K5/7Ve 599 0
2 V* DM Tau Or* 04 33 48.7335659850 +18 10 09.974471722 14.30 14.82 14.00     M2Ve 510 0
3 V* GM Aur Or* 04 55 10.9813656049 +30 21 59.375978047 14.59 14.22 13.10     K3Ve 552 0

    Equat.    Gal    SGal    Ecl

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2020.07.16-15:25:47

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