Hostname: page-component-586b7cd67f-t7fkt Total loading time: 0 Render date: 2024-11-25T04:39:14.020Z Has data issue: false hasContentIssue false
  • English
  • Français

Very Low Mass Stars and Brown Dwarf Candidates in Orion OB1a and OB1b

Published online by Cambridge University Press:  26 May 2016

Frederick M. Walter ,
William H. Sherry  and
Scott J. Wolk
Frederick M. Walter
Affiliation:
Stony Brook University, Stony Brook NY 11794
William H. Sherry
Affiliation:
Stony Brook University, Stony Brook NY 11794
Scott J. Wolk
Affiliation:
Center for Astrophysics, 60 Garden St, Cambridge MA 02138

Abstract

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

VRI images within the belt of Orion and the Ori OB1a association reveal a pre-main sequence locus extending to below our completeness limit of about V=21. We report here on followup JHK imaging and optical and near–IR spectroscopy of the faintest and reddest of the PMS candidates. We find that they are unreddened mid-to-late M “stars” which fall on a few million year isochrone. Masses are largely substellar, reaching as low as about 0.02 M⊙ (20 Jovian masses). The space density of the substellar objects is high.

Type
Part 2. Observations of Recently Born Substellar Objects
Information
Symposium - International Astronomical Union , Volume 211: Brown Dwarfs , 2003 , pp. 119 - 122
Copyright
Copyright © Astronomical Society of the Pacific 2001 

References

Baraffe, I., Chabrier, G., Allard, F., & Hauschildt, P.H. 1998, A&A, 337, 403 Google Scholar
Béjar, V.J.S., Zapatero Osorio, M.R., & Rebolo, R., 1999, ApJ, 521, 671 Google Scholar
Blaauw, A. 1964, ARA&A, 2, 213 Google Scholar
Blaauw, A. 1991, in NATO ASI Vol. 345, The Physics of Star Formation and Early Stellar Evolution, ed. Lada, C.J. & Kyfalis, N.D., 125 Google Scholar
Brown, A.G.A., de Geus, E.J., & de Zeeuw, P.T., 1994, A&A, 289, 101 Google Scholar
Brown, A.G.A., Walter, F.M., & Blaauw, A. 1998, in The Orion Complex Revisited, ed. Burkert, A. & McCaughrean, M., in press Google Scholar
Hillenbrand, L., 1997, AJ, 113, 1733 Google Scholar
Kroupa, P. 2002, Science, 295, 82 CrossRefGoogle Scholar
Walter, F.M., et al., 2000, in Protostars and Planets IV, ed. Mannings, V., Boss, A. P., & Russell, S.S. (Tucson: University of Arizona), 273 Google Scholar
Walter, F.M., Wolk, S.J., & Sherry, W.H. 1998, in ASP Conf. Ser. Vol. 154, Cool Stars, Stellar Systems, and the Sun, ed. Donahue, R.A. & Bookbinder, J.A. (San Francisco: ASP), CD-1793 Google Scholar
Wolk, S.J. & Walter, F.M. 2000, in Proceedings of the Euroconference on Very Low Mass Stars and Brown Dwarfs in Stellar Clusters and Associations, ed. Rebolo, R. & Zapatero, M.R. Osorio, 38 Google Scholar
Zapatero Osorio, M.R., Béjar, V.J.S., Rebolo, R., Martín, E.L., & Basri, G., 1999, ApJ, 524, L115 CrossRefGoogle Scholar