2012AJ....144...13V


Query : 2012AJ....144...13V

2012AJ....144...13V - Astron. J., 144, 13 (2012/July-0)

A near-infrared study of the star-forming region RCW 34.

VAN DER WALT D.J., DE VILLIERS H.M. and CZANIK R.J.

Abstract (from CDS):

We report the results of a near-infrared imaging study of a 7.8x7.8 arcmin2 region centered on the 6.7 GHz methanol maser associated with the RCW 34 star-forming region using the 1.4 m IRSF telescope at Sutherland. A total of 1283 objects were detected simultaneously in J, H, and K for an exposure time of 10,800 s. The J - H, H - K two-color diagram revealed a strong concentration of more than 700 objects with colors similar to what is expected of reddened classical T Tauri stars. The distribution of the objects on the K versus J - K color-magnitude diagram is also suggestive that a significant fraction of the 1283 objects is made up of lower mass pre-main-sequence stars. We also present the luminosity function for the subset of about 700 pre-main-sequence stars and show that it suggests ongoing star formation activity for about 107 years. An examination of the spatial distribution of the pre-main-sequence stars shows that the fainter (older) part of the population is more dispersed over the observed region and the brighter (younger) subset is more concentrated around the position of the O8.5V star. This suggests that the physical effects of the O8.5V star and the two early B-type stars on the remainder of the cloud out of which they formed could have played a role in the onset of the more recent episode of star formation in RCW 34.

Abstract Copyright:

Journal keyword(s): ISM: individual: RCW 34 - stars: formation - stars: pre-main sequence

Simbad objects: 12

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Number of rows : 12
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 NGC 1333 OpC 03 29 11 +31 18.6           ~ 1345 1
2 IC 348 OpC 03 44 32 +32 09.5           ~ 1321 1
3 NAME Orion Nebula Cluster OpC 05 35.0 -05 29           ~ 2172 1
4 NAME Horsehead Nebula DNe 05 40 59.0 -02 27 30           ~ 484 0
5 LDN 1630 DNe 05 45.5 -00 59           ~ 371 0
6 RAFGL 5180 SFR 06 08 54.1 +21 38 25           ~ 113 0
7 NGC 2316 Cl* 06 59 41.7 -07 46 07           ~ 46 1
8 RCW 34 HII 08 56 28.1 -43 05 58   10.5 11.21     ~ 94 0
9 V* V391 Vel Or* 08 56 28.109952 -43 05 55.40028 12.61 12.71 11.73 11.50   O8/8.5V 81 1
10 [BPW2010] 24 * 08 56 28.40 -43 05 34.9           K 2 0
11 NAME Vela R2 As* 09 00 -43.0           ~ 25 0
12 NGC 7538 OpC 23 13 37 +61 30.0           ~ 853 1

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2022.09.26-13:41:30

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