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An evolved disk surrounding the massive main sequence star MWC 297? | | P. Manoj
; Paul T. P. Ho
; Nagayoshi Ohashi
; Qizhou Zhang
; T. Hasegawa
; Huei-Ru Chen
; H. C. Bhatt
; N. M. Ashok
; | | Date: |
15 Aug 2007 | | Abstract: | We present the results of the interferometric observations of the
circumstellar disk surrounding MWC 297 in the continuum at 230 GHz (1.3 mm) and
in the (J=2-1) rotational transitions of $^{12}$CO,$^{13}$CO and C$^{18}$O
using the Submillimeter Array. At a distance of 250 pc, MWC 297 is one of the
closest, young massive stars (M$_{star}$ $sim$10 M$_{odot}$) to us. Compact
continuum emission is detected towards MWC 297 from which we estimate a disk
mass (gas+dust) of 0.07 M$_{odot}$ and a disk radius of $le$ 80 AU. Our
result demonstrates that circumstellar disks can survive around massive stars
well into their main sequence phase even after they have become optically
visible. Complementing our observations with the data compiled from the
literature, we find the submm dust opacity index $eta$ to be between 0.1 and
0.3. If the emission is optically thin, the low value of $eta$ indicates the
presence of relatively large grains in the disk, possibly because of grain
growth. We do not detect any CO emission associated with the continuum source.
We argue that the $^{13}$CO emission from the disk is likely optically thin, in
which case, we derive an upper limit to the gas mass which implies significant
depletion of molecular gas in the disk. The mass of this disk and the
evolutionary trends observed are similar to those found for intermediate mass
Herbig Ae stars and low mass T Tauri stars. | | Source: | arXiv, 0708.2064 | | Services: | Forum | Review | PDF | Favorites | |
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