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The stellar population of the Lupus cloudsWe present photometric and spectroscopic observations of the H alpha emission stars in the Lupus dark cloud complex. We estimate the effective temperatures of the stars from their spectral types and calculate the reddening towards each object from the (R-I) colors. From these data, we derive mass and age distributions for the Lupus stars using a new set of pre-main sequence evolutionar tracks. We compare the results for the Lupus stars with those for a similar population of young stellar objects in Taurus-Auriga and Chamaeleon and with the initial mass function for field stars in the solar neighborhood. From the H-R diagrams, Lupus appears to contain older stars than Taurus. The Lupus dark clouds form a greater proportion of low mass stars than the Taurus complex. Also, the proportion of low mass stars in Lupus is higher than that predicted by the Miller-Scalo initial mass function, and the lowest mass stars in Lupus are less active than similar T Tauri stars in other regions.
Document ID
19950033251
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Hughes, Joanne
(Univ. of Massachusetts, Amherst, MA United States)
Hartigan, Patrick
(Univ. of Massachusetts, Amherst, MA United States)
Krautter, Joachim
(Landessternwarte Koenigstuhl, Heidelberg, Germany)
Kelemen, Janos
(Konkoly Observatory Budapest, Hungary)
Date Acquired
August 16, 2013
Publication Date
September 1, 1994
Publication Information
Publication: The Astronomical Journal
Volume: 108
Issue: 3
ISSN: 0004-6256
Subject Category
Astronomy
Accession Number
95A64850
Distribution Limits
Public
Copyright
Other

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