Physics
Scientific paper
Sep 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994aj....108.1071h&link_type=abstract
The Astronomical Journal, vol. 108, no. 3, p. 1071-1090
Physics
108
Molecular Clouds, Star Formation, Stellar Mass, Stellar Physics, Stellar Spectra, T Tauri Stars, Astronomical Photometry, Astronomical Spectroscopy, Chronology, Graphs (Charts), Populations, Spectral Emission, Spectral Energy Distribution, Spectrum Analysis, Tables (Data)
Scientific paper
We 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.
Hartigan Patrick
Hughes Joanne
Kelemen János
Krautter Joachim
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