2014A&A...563A.123G


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.13CEST06:24:52

2014A&A...563A.123G - Astronomy and Astrophysics, volume 563A, 123-123 (2014/3-1)

The ionizing sources of luminous compact H II regions in the RCW 106 and RCW 122 clouds.

GRAVE J.M.C., KUMAR M.S.N., OJHA D.K., TEIXEIRA G.D.C. and PACE G.

Abstract (from CDS):

Given the rarity of young O star candidates, compact HII regions embedded in dense molecular cores continue to serve as potential sites for peering into the details of high-mass star formation. We uncover the ionizing sources of the most luminous and compact HII regions embedded in the RCW106 and RCW122 giant molecular clouds, known to be relatively nearby (2-4kpc) and isolated, thus providing an opportunity to examine spatial scales of a few hundred to a thousand AU in size. High spatial resolution (0.3''), mid-infrared spectra (R=350), including the fine structure lines [ArIII] and [NeII], were obtained for four luminous compact HII regions embedded inside the dense cores within the RCW106 and RCW122 molecular cloud complexes. At this resolution, these targets reveal point-like sources surrounded by the nebulosity of different morphologies, thereby uncovering details at spatial dimensions of <1000AU. The point-like sources display [ArIII] and [NeII] lines - the ratios of which are used to estimate the effective temperature of the embedded sources. The derived temperatures are indicative of mid-late O type objects for all the sources with [ArIII] emission. Previously known characteristics of these targets from the literature, including evidence of disk or accretion, suggest that the identified sources may grow more to become early-type O stars by the end of the star formation process.

Abstract Copyright:

Journal keyword(s): stars: formation - HII regions - infrared: stars

Status at CDS:   Examining the need for a new acronym.

Simbad objects: 10

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Number of rows : 10

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 * eps Oph PM* 16 18 19.2897431 -04 41 33.034466 4.95 4.21 3.23 2.54 2.05 G9.5IIIbFe-0.5 225 0
2 GAL 332.80-00.60 HII 16 19 47 -51 04.1           ~ 92 1
3 [MKN2004] MMS 68 mm 16 20 11.9 -50 53 17           ~ 3 0
4 [MKN2004] MMS 5 mm 16 22 10.1 -50 06 06           ~ 3 0
5 SNR G333.6-00.2 HII 16 22 11 -50 05.6           ~ 140 0
6 RCW 122A IR 17 20 05 -38 57.8           ~ 4 0
7 BFS 65 HII 17 20 05.8 -38 57 37           ~ 72 0
8 NAME Gal Center reg 17 45 40.04 -29 00 28.1           ~ 11542 0
9 * zet Pav PM* 18 43 02.1352809 -71 25 41.206465   5.138 4.003     K0III 59 0
10 HD 184996 PM* 19 41 37.2649232535 -65 51 15.892520398   7.639 6.074     M0III 14 0

    Equat.    Gal    SGal    Ecl

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2020.07.13-06:24:52

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