The photospheres of embedded young stellar objects.

Details The photospheres of embedded young stellar objects. The photospheres of embedded young stellar objects.

Feb 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996a%26a...306..427c&link_type=abstract

Astronomy and Astrophysics, v.306, p.427

Astronomy and Astrophysics

Astrophysics

49

Stars: Pre-Main-Sequence, Circumstellar Matter, Infrared: Stars

Scientific paper

We present an extensive study of the infrared ({DELTA}V=2) CO absorption bands in low-luminosity young stars at intermediate resolutions (R=~1000), and at high resolution (R=~17000) for a sub-sample. The bands are very common in YSOs and correlate well with SED class in the sense that Class II sources tend to show CO absorption while Class I sources do not. From the relative band strengths a lower limit on the CO excitation temperature of 2300K is derived. The echelle spectra show that the majority of CO bandheads are broadened by less than 17 km/s and point to a stellar photospheric origin rather than a disk; they also suggest that most YSOs are only slowly rotating. The band strengths are inversely correlated with the thermal infrared excess, which leads to a simple model in which the CO bands from the central PMS star are veiled by continuum emission from circumstellar dust.

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