Other
Scientific paper
May 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003aas...202.2806m&link_type=abstract
American Astronomical Society Meeting 202, #28.06; Bulletin of the American Astronomical Society, Vol. 35, p.736
Other
1
Scientific paper
Infrared spectra are presented for a magnitude-limited (K<12 mag) sample of stellar objects observed toward the R Coronae Australis molecular core. These spectra, which are used to identify young stellar objects in the cloud, include emission lines from [FeII] and H2, four of the Brackett series lines, the CO bandheads, as well as photospheric absorption lines of Na, Mg, Si, and Ca. For a subset of the sample, the spectra are compared to those of standard stars to derive spectral types and luminosity classes. By comparing their placement in the H-R diagram with theoretical evolutionary tracks, we estimate the stellar masses and assess the evolutionary state of this young aggregate. All of sources classified via near-IR spectroscopy have masses in the range 0.2-1.2 MSun. The locus of points in the HR diagram is lower than observed for other embedded clusters (e.g. NGC 2024 and Ophiuchus) suggesting either a more advanced evolutionary state or differences in the intrinsic stellar birthlines for these very young clusters.
Meyer Michael R.
Wilking Bruce A.
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