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          Institute: MPI für Radioastronomie     Collection: Publikationen des MPI für Radioastronomie     Display Documents

ID: 12264.0, MPI für Radioastronomie / Publikationen des MPI für Radioastronomie
The massive star-forming region G323.74-0.26
Authors:Walsh, A. J.; Lee, J. K.; Burton, M. G.
Date of Publication (YYYY-MM-DD):2002-01-11
Title of Journal:Monthly Notices of the Royal Astronomical Society
Journal Abbrev.:Mon. Not. Roy. Astron. Soc.
Issue / Number:2
Start Page:475
End Page:480
Review Status:Peer-review
Audience:Experts Only
Abstract / Description:We report near-infrared molecular hydrogen and Brackett gamma observations towards the massive star formation site G323.74- 0.26. The region contains an H II region, similar to 30 arcsec across, and two Class II methanol maser sites, which are separate from the H II region. We show that the spectral type of the star powering the H II region is B0. We also show that at least one of the maser sites is powered by an infrared source that appears to be at least as luminous as the star responsible for the H II region. However, neither of the two stars associated with the methanol maser sites shows any signs of radio continuum emission above 0.2 mJy. For at least one of these maser sites, this shows a real deficiency in the radio continuum flux, which we suggest is an indication that the star is in an early stage of development, before its H II region becomes visible, or it is a multiple intermediate mass star system. A shocked molecular hydrogen outflow is seen extending from one of the maser sites towards the west and possibly in a fan shape, suggesting that the stars, associated with the maser sites are indeed at a very early stage of evolution.
Free Keywords:masers; stars : formation; HII regions; ISM : individual : G323.74-0.26; ISM : jets and outflows
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Radioastronomie
External Affiliations:Harvard Smithsonian Ctr Astrophys, Mail Stop 42,60 Garden St,; Cambridge, MA 02138 USA; Max Planck Inst Radioastron, D-53121 Bonn, Germany; Univ New S Wales, Dept Astrophys & Opt, Sch Phys, Sydney, NSW 2052, Australia
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