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Infrared CO Emission from Young Stars: Accretion Disks and Neutral Winds

Chandler, C. J. and Carlstrom, J. E. and Scoville, N. Z. (1995) Infrared CO Emission from Young Stars: Accretion Disks and Neutral Winds. Astrophysical Journal, 446 . pp. 793-800. ISSN 0004-637X. doi:10.1086/175836.

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We have modeled the emission in the first-overtone rotation-vibration bands of CO from accretion disks and neutral winds. We compare our models with high-resolution spectra of five objects: DG Tau, SVS 13, WL 16, NGC 2024 IRS 2, and S106 IRS 4. The emission from accretion disks with accretion rates of ˜10^(-8) to 10^(-7) M_(sun) yr^(-1) successfully reproduce the fluxes, the profiles, and the optical depths of the observed spectra. We also find for several objects that the data are best reproduced by the disk model, with higher K-band extinctions to the central star than those measured by other methods. A simple wind model can also account for the flux and line profile in a number of cases, but fails to reproduce the high optical depth obtained by fitting low-resolution data. Furthermore, unreasonably high mass-loss rates are needed to reproduce the flux. However, if there are sources of heating in the wind preventing it from cooling adiabatically, the CO emission region is larger and lower mass-loss rates may be accommodated.

Item Type:Article
Related URLs:
URLURL TypeDescription
Carlstrom, J. E.0000-0002-2044-7665
Scoville, N. Z.0000-0002-0438-3323
Additional Information:© 1995 American Astronomical Society. Received 1994 August 17; accepted 1994 December 22. We thank the referee for useful comments which helped improve this paper. C. J. C. was funded by a SERC/NATO Fellowship during part of this work. The Owens Valley Radio Observatory is funded by NSF grant AST 93-14079.
Group:Owens Valley Radio Observatory (OVRO)
Funding AgencyGrant Number
NSFAST 93-14079
Science and Engineering Research Council (SERC)UNSPECIFIED
North Atlantic Treaty Organization (NATO)UNSPECIFIED
Record Number:CaltechAUTHORS:20160608-180241053
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ID Code:67791
Deposited By: Joy Painter
Deposited On:09 Jun 2016 04:29
Last Modified:11 Nov 2021 03:54

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