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Title: A NEAR-INFRARED STUDY OF THE STAR-FORMING REGION RCW 34

Abstract

We report the results of a near-infrared imaging study of a 7.8 Multiplication-Sign 7.8 arcmin{sup 2} 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 10{sup 7} 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 themore » 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.« less

Authors:
; ;  [1]
  1. Centre for Space Research, North-West University, Potchefstroom (South Africa)
Publication Date:
OSTI Identifier:
22034426
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astronomical Journal (New York, N.Y. Online); Journal Volume: 144; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ASTRONOMY; ASTROPHYSICS; COLOR; DIAGRAMS; EMISSION SPECTROSCOPY; GHZ RANGE; LUMINOSITY; MAIN SEQUENCE STARS; MASERS; MASS; METHANOL; NEAR INFRARED RADIATION; SPATIAL DISTRIBUTION; STAR EVOLUTION; T TAURI STARS

Citation Formats

Van der Walt, D. J., De Villiers, H. M., and Czanik, R. J. A NEAR-INFRARED STUDY OF THE STAR-FORMING REGION RCW 34. United States: N. p., 2012. Web. doi:10.1088/0004-6256/144/1/13.
Van der Walt, D. J., De Villiers, H. M., & Czanik, R. J. A NEAR-INFRARED STUDY OF THE STAR-FORMING REGION RCW 34. United States. doi:10.1088/0004-6256/144/1/13.
Van der Walt, D. J., De Villiers, H. M., and Czanik, R. J. Sun . "A NEAR-INFRARED STUDY OF THE STAR-FORMING REGION RCW 34". United States. doi:10.1088/0004-6256/144/1/13.
@article{osti_22034426,
title = {A NEAR-INFRARED STUDY OF THE STAR-FORMING REGION RCW 34},
author = {Van der Walt, D. J. and De Villiers, H. M. and Czanik, R. J.},
abstractNote = {We report the results of a near-infrared imaging study of a 7.8 Multiplication-Sign 7.8 arcmin{sup 2} 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 10{sup 7} 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.},
doi = {10.1088/0004-6256/144/1/13},
journal = {Astronomical Journal (New York, N.Y. Online)},
number = 1,
volume = 144,
place = {United States},
year = {Sun Jul 15 00:00:00 EDT 2012},
month = {Sun Jul 15 00:00:00 EDT 2012}
}