Astronomy and Astrophysics – Astronomy
Scientific paper
May 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21442205s&link_type=abstract
American Astronomical Society, AAS Meeting #214, #422.05; Bulletin of the American Astronomical Society, Vol. 41, p.691
Astronomy and Astrophysics
Astronomy
Scientific paper
The Cryogenic Infrared Echelle Spectrograph (CRIRES) at the Very Large Telescope (VLT) in Chile was used to acquire very high resolution (R = λ/Δλ ≈ 95,000) ro-vibrational absorption spectra of CO toward nearby embedded young stellar objects (YSOs). These data have been shown to yield highly precise quantitative determinations of the isotope ratios of both carbon and rare isotopes of oxygen in both a Stage I and Stage II YSO (protostars with a surrounding molecular envelope, and a primordial disk without an envelope, respectively), which has important implications for chemistry in the solar accretion disk. Carbon monoxide is a reliable tracer of chemical inheritance from the envelope to the disk in solar-type YSOs, and Stage I objects are excellent targets for investigating the early stages of disk evolution.
Here we present new 12CO/13CO measurements of objects still embedded in their parental molecular cloud. Preliminary results for the embedded source, IRS 63, indicate warm ( 150 K) and cold ( 20 K) regions, likely representing the gas close to the central protostar and the surrounding envelope, respectively. The derived 12C/13C ratio of 150 in the warm component is significantly higher than the solar system ratio of 89 and several times higher than local ISM 12C/13C estimates determined from radio and infared observations. Results for IRS 63 are, however, more in accord with recent CRIRES measurements in a Stage I and Stage II YSO, each of which yield a 12C/13C ratio of 100. Our goal is to use these new, highly reliable observations of carbon fractionation in YSOs to better understand the evolution of circumstellar disks, as well as that of volatile elements in the solar nebula via comparison to meteorite and solar data.
Herczeg Gregory J.
Pontoppidan Klaus Martin
Smith Rachel L.
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