2004A&A...427L..13B


C.D.S. - SIMBAD4 rel 1.7 - 2021.03.03CET11:22:59

2004A&A...427L..13B - Astronomy and Astrophysics, volume 427, L13-16 (2004/12-1)

Evidence for an inner molecular disk around massive Young Stellar Objects.

BIK A. and THI W.F.

Abstract (from CDS):

We present observations of CO overtone bandhead emission toward four massive Young Stellar Objects (spectral type O6-B5). The high signal-to-noise ratio K-band spectra were obtained with VLT-ISAAC at a resolution Δv=30km/s, sufficient to resolve the bandheads, but not the individual J-lines. We are able to explain the shape of the lines by assuming a simple isothermal Keplerian disk model seen at different inclinations. The gas temperature ranges from 1500 to 4500K and the CO column density is between 0.1 and 4x1021cm–2. The emission probably arises within the first few astronomical units of the disk, consistent with the high gas temperature. Our results indicate that molecules can survive close to a hot star and suggest that dense (nH>1010cm–3) inner disks may be relatively common at an advanced stage of high-mass star formation.

Abstract Copyright:

Journal keyword(s): stars: early-type, formation - circumstellar matter - molecular processes - line: profiles

Simbad objects: 5

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Number of rows : 5

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 [BCB89] IRS 2 Y*O 05 41 45.81 -01 54 29.8           B 95 0
2 MSX5C G265.1485+01.4474 HII 08 59 25.2 -43 45 46           ~ 33 1
3 NAME NGC 3576 IRS 1 HII 11 11 54.8 -61 18 26           ~ 30 1
4 IRAS 16164-5046 HII 16 20 14.1 -50 53 20           ~ 27 0
5 IRAS 18006-2422 HII 18 03 45.7 -24 22 41           ~ 22 0

    Equat.    Gal    SGal    Ecl

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2021.03.03-11:22:59

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