Probing discs around massive young stellar objects with CO first overtone emission

Wheelwright, H.E. and Oudmaijer, Rene D. and de Wit, W.J. and Hoare, Melvin G. and Lumsden, Stuart L. and Urquhart, J.S. (2010) Probing discs around massive young stellar objects with CO first overtone emission. Monthly Notices of the Royal Astronomical Society, 408 (3). pp. 1840-1850. ISSN 0035-8711. (doi:https://doi.org/10.1111/j.1365-2966.2010.17250.x) (The full text of this publication is not currently available from this repository. You may be able to access a copy if URLs are provided)

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http://www.dx.doi.org/10.1111/j.1365-2966.2010.172...

Abstract

We present high-resolution (R? 50 000) spectroastrometry over the CO first overtone bandhead of a sample of seven intermediate/massive young stellar objects. These are primarily drawn from the Red MSX source (RMS) survey, a systematic search for young massive stars which has returned a large, well selected sample of such objects. The mean luminosity of the sample is approximately 5 × 104 L?, indicating the objects typically have a mass of ?15 M?. We fit the observed bandhead profiles with a model of a circumstellar disc, and find good agreement between the models and observations for all but one object. We compare the high angular precision (0.2–0.8 × 10?3 arcsec) spectroastrometric data to the spatial distribution of the emitting material in the best-fitting models. No spatial signatures of discs are detected, which is entirely consistent with the properties of the best-fitting models. Therefore, the observations suggest that the CO bandhead emission of massive young stellar objects originates in small-scale discs, in agreement with previous work. This provides further evidence that massive stars form via disc accretion, as suggested by recent simulations.

Item Type: Article
Uncontrolled keywords: Accretion, accretion discs, Circumstellar matter, Line: profiles, Stars: formation, Stars: massive, Techniques: high angular resolution
Subjects: Q Science > QB Astronomy > QB460 Astrophysics
Divisions: Faculties > Sciences > School of Physical Sciences > Centre for Astrophysics and Planetary Sciences
Depositing User: James Urquhart
Date Deposited: 30 Nov 2015 16:08 UTC
Last Modified: 30 May 2018 08:55 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/52229 (The current URI for this page, for reference purposes)
Urquhart, J.S.: https://orcid.org/0000-0002-1605-8050
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