Rebull, L. M. and Johnson, C. H. and Hoette, V. and Kim, J. S. and Laine, S. and Foster, M. and Laher, R. and Legassie, M. and Mallory, C. R. and McCarron, K. and Sherry, W. H. (2011) New Young Star Candidates in CG4 and Sa101. Astronomical Journal, 142 (1). Art. No. 25. ISSN 0004-6256 http://resolver.caltech.edu/CaltechAUTHORS:20110628-111924900
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Abstract
The CG4 and Sa101 regions together cover a region of ~0.5 deg^2 in the vicinity of a "cometary globule" that is part of the Gum Nebula. There are seven previously identified young stars in this region; we have searched for new young stars using mid- and far-infrared data (3.6-70 μm) from the Spitzer Space Telescope, combined with ground-based optical data and near-infrared data from the Two Micron All Sky Survey. We find infrared excesses in all six of the previously identified young stars in our maps and identify 16 more candidate young stars based on apparent infrared excesses. Most (73%) of the new young stars are Class II objects. There is a tighter grouping of young stars and young star candidates in the Sa101 region, in contrast to the CG4 region, where there are fewer young stars and young star candidates, and they are more dispersed. Few likely young objects are found in the "fingers" of the dust being disturbed by the ionization front from the heart of the Gum Nebula.
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| Additional Information: | © 2011 American Astronomical Society. Received 2011 March 24; accepted 2011 April 29; published 2011 June 13. This work was performed as part of the NASA/IPAC Teacher Archive Research Program (NITARP; http://nitarp.ipac.caltech.edu), class of 2010. We acknowledge here all of the students and other folks who contributed their time and energy to this work and the related poster papers presented at the 2011 January American Astronomical Society (AAS) meeting in Seattle,WA. They include—with V. Hoette: C. Gartner, J. VanDerMolen, L. Gamble, L. Matsche, A. McCartney, M. Doering, S. Brown, R. Wernis, J. Wirth, and M. Berthoud; with C. Johnson: R. Crump, N. Killingstad, T. McCanna, S. Caruso, A. Laorr, K., Mork, E. Steinbergs, and E. Wigley; with C. Mallory: N. Mahmud. We thank J. R. Stauffer for helpful comments on the manuscript. J. S. Kim and M. Foster thank the NASA Space Grant program at the University of Arizona. This research has made use of NASA’s Astrophysics Data System (ADS) Abstract Service, and of the SIMBAD database, operated at CDS, Strasbourg, France. This research has made use of data products from the Two Micron All Sky Survey (2MASS), which is a joint project of the University of Massachusetts and the Infrared Processing and Analysis Center, funded by the National Aeronautics and Space Administration and the National Science Foundation. These data were served by the NASA/IPAC Infrared Science Archive, which is operated by the Jet Propulsion Laboratory, California Institute of Technology, under contract with the National Aeronautics and Space Administration. This research has made use of the Digitized Sky Surveys, which were produced at the Space Telescope Science Institute under U.S. Government grant NAG W-2166. The images of these surveys are based on photographic data obtained using the Oschin Schmidt Telescope on Palomar Mountain and the UK Schmidt Telescope. The plates were processed into the present compressed digital form with the permission of these institutions. This research has made use of the NASA/ IPAC Extragalactic Database (NED) which is operated by the Jet Propulsion Laboratory, California Institute of Technology, under contract with the National Aeronautics and Space Administration. The research described in this paper was partially carried out at the Jet Propulsion Laboratory, California Institute of Technology, under contract with the National Aeronautics and Space Administration. | ||||
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| Subject Keywords: | circumstellar matter; infrared: stars; stars: formation; stars: pre-main sequence | ||||
| Classification Code: | PACS: 98.38.Dq; 97.21.+a; 97.10.Fy | ||||
| Record Number: | CaltechAUTHORS:20110628-111924900 | ||||
| Persistent URL: | http://resolver.caltech.edu/CaltechAUTHORS:20110628-111924900 | ||||
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| Official Citation: | New Young Star Candidates in CG4 and Sa101 L. M. Rebull et al. 2011 The Astronomical Journal 142 25 | ||||
| Usage Policy: | No commercial reproduction, distribution, display or performance rights in this work are provided. | ||||
| ID Code: | 24241 | ||||
| Collection: | CaltechAUTHORS | ||||
| Deposited By: | Jason Perez | ||||
| Deposited On: | 28 Jun 2011 22:27 | ||||
| Last Modified: | 26 Dec 2012 13:21 |
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