Hostname: page-component-cd9895bd7-p9bg8 Total loading time: 0 Render date: 2024-12-12T21:55:20.241Z Has data issue: false hasContentIssue false
  • English
  • Français

Very Low-Luminosity Objects in Star-Forming Regions

Published online by Cambridge University Press:  14 August 2015

Motohide Tamura ,
Yoichi Itoh ,
Yumiko Oasa ,
Alan Tokunaga  and
Koji Sugitani
Motohide Tamura
Affiliation:
National Astronomical Observatory of Japan, Osawa 2-21-1, Mitaka, Tokyo181, Japan
Yoichi Itoh
Affiliation:
University of Tokyo, Osawa 2-21-1, Mitaka, Tokyo 181, Japan
Yumiko Oasa
Affiliation:
University of Tokyo, Osawa 2-21-1, Mitaka, Tokyo 181, Japan
Alan Tokunaga
Affiliation:
Institute for Astronomy, University of Hawaii, 2680 Woodlawn Drive, Honolulu, HI96822, USA
Koji Sugitani
Affiliation:
Nagoya City University, Mizuho-ku, Nagoya 467, Japan

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.

In order to tackle the problems of low-mass end of the initial mass function (IMF) in star-forming regions and the formation mechanisms of brown dwarfs, we have conducted deep infrared surveys of nearby molecular clouds. We have found a significant population of very low-luminosity sources with IR excesses in the Taurus cloud and the Chamaeleon cloud core regions whose extinction corrected J magnitudes are 3 to 8 mag fainter than those of typical T Tauri stars in the same cloud. Some of them are associated with even fainter companions. Follow-up IR spectroscopy has confirmed for the selected sources that their photospheric temperature is around 2000 to 3000 K. Thus, these very low-luminosity young stellar sources are most likely very low-mass T Tauri stars, and some of them might even be young brown dwarfs.

Type
II. Joint Discussions
Information
Highlights of Astronomy , Volume 11 , Issue 1: Highlights of Astronomy. As presented at the XXIIIrd General Assembly of the IAU (Part A), 1997 , 1998 , pp. 423 - 424
Copyright
Copyright © Kluwer 1998

References

D’Antona, F., & Mazzitelli, I. 1994, ApJS, 164, 349 Google Scholar
Itoh, Y., Tamura, M., & Gatley, I. 1996, ApJ, 465, L129 Google Scholar
Itoh, Y., Tamura, M., & Tokunaga, A. 1997, in preparationGoogle Scholar
Oasa, Y., Tamura, M., & Sugitani, K. 1997, in preparationGoogle Scholar
Tamura, M. et al. 1997, in Extrasolar planets and brown dwarfs, ed. Rebolo, R., ASP Conf Ser., in pressGoogle Scholar