A Caltech Library Service

G34.24+0.13MM: A Deeply Embedded Proto–B Star

Hunter, T. R. and Neugebauer, G. and Benford, D. J. and Matthews, K. and Lis, D. C. and Serabyn, E. and Phillips, T. G. (1998) G34.24+0.13MM: A Deeply Embedded Proto–B Star. Astrophysical Journal, 493 (2). L97-L100. ISSN 0004-637X. doi:10.1086/311142.

[img] PDF - Published Version
See Usage Policy.


Use this Persistent URL to link to this item:


By means of millimeter and submillimeter imaging, we have identified a massive protostellar object that coincides with a methanol maser and is not detectable in the continuum at centimeter wavelengths. Located 84" (1.5 pc) southeast of the ultracompact H II (UCHII) region G34.26+0.15, the new object G34.24+0.13MM was discovered in a wide-field 350 μm continuum image obtained with the Submillimeter High Angular Resolution Camera (SHARC) at the Caltech Submillimeter Observatory (CSO). Interferometric imaging at 225.7 and 110.7 GHz continuum has determined more precisely the position and angular diameter (2".0, or 7600 AU) of the object. No source was detected at that position in 1.2-3.7 μm imaging or 10 and 20 μm photometry. Our observations are consistent with a cool dust core with temperature ~50 K, total gas mass 100 M_☉, and total luminosity in the range of 1600-6300 L_☉. Considering the high luminosity and lack of compact radio continuum emission, we conclude that this core probably contains a deeply embedded proto-B star.

Item Type:Article
Related URLs:
URLURL TypeDescription
Hunter, T. R.0000-0001-6492-0090
Benford, D. J.0000-0002-9884-4206
Lis, D. C.0000-0002-0500-4700
Additional Information:© 1998 American Astronomical Society. Received 21 October 1997. Accepted 26 November 1997. Published 14 January 1998. We thank R. Burrows for assistance at the 200 inch, and D. Shepherd for help with the OVRO observations. The CSO and OVRO are funded by the NSF under contracts AST96-15025 and AST96-13717. We are grateful to A. Sargent, T. K. Sridharan, T. Megeath, D. Wilner, and D. Mehringer for helpful discussions. We thank S. Urban at USNO for directing us to the Hipparcos coordinates of our reference stars. T. R. H. thanks P. Ho and the SAO for supporting this research, which made use of the SIMBAD database operated at CDS, Strasbourg, France.
Funding AgencyGrant Number
Subject Keywords:stars: formation; infrared: stars; ISM: individual (G34.24+0.13)
Issue or Number:2
Record Number:CaltechAUTHORS:20170223-141455305
Persistent URL:
Official Citation:T. R. Hunter et al 1998 ApJ 493 L97
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:74507
Deposited By: Ruth Sustaita
Deposited On:23 Feb 2017 22:25
Last Modified:11 Nov 2021 05:27

Repository Staff Only: item control page