Astronomy and Astrophysics – Astronomy
Scientific paper
May 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997aas...190.1704g&link_type=abstract
American Astronomical Society, 190th AAS Meeting, #17.04; Bulletin of the American Astronomical Society, Vol. 29, p.798
Astronomy and Astrophysics
Astronomy
Scientific paper
We present new high resolution (R =~ 21,000) near-infrared (lambda = 2 mu m) spectroscopic observations of flat-spectrum young stellar objects in the rho Ophiuchi dark cloud. These are the first observations which reveal details of the photospheres of stars at such early evolutionary stages. No clear spectroscopic signatures of line formation in Keplerian circumstellar disks are observed. The 2.294 mu m nu = 0 - 2 CO spectra show that some of these flat-spectrum objects are rotating very rapidly (v sin i =~ 50 km s(-1) ), much faster than pre-main-sequence stars with smaller infrared excesses. However, the 2.207 mu m spectral regions of these extremely young stars are more similar to those of late-type dwarf or pre-main-sequence stars than to those of stellar giants or FU Ori-type young stars. These characteristics can be understood if flat-spectrum objects have stellar structures similar to those of (more evolved) pre-main-sequence stars but are accreting mass from their circumstellar disks at rates between those of T Tauri stars and FU Ori stars.
Greene Thomas P.
Lada Charles J.
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