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Very Low-Luminosity Objects in Star-Forming Regions

  • Motohide Tamura (a1), Yoichi Itoh (a2), Yumiko Oasa (a2), Alan Tokunaga (a3) and Koji Sugitani (a4)...

Abstract

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.

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References

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

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