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Evidence for HCO^+ infall toward T Tauri?

van Langevelde, Huib Jan and van Dishoeck, Ewine F. and Blake, Geoffrey A. (1994) Evidence for HCO^+ infall toward T Tauri? Astrophysical Journal Letters, 425 (1). L45-L48. ISSN 2041-8205. http://resolver.caltech.edu/CaltechAUTHORS:20120918-090118190

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Abstract

High spectral and spatial resolution observations of the HCO^+ molecule toward the T Tau binary system obtained with the Owens Valley Millimeter Array reveal a broad emission line profile (V_(LSR) = 7.2 km s^(-1), ΔV = 2.0 km s^(-1)) upon which a narrow, redshifted absorption feature (V_(LSR) = 8.5 km s^(-1), ΔV ≈ 0.5 km s^(-1)) is superposed. One possible interpretation of the absorption is that it rises from infall of molecular cloud envelope material onto the immediate circumbinary region, which would imply that large-scale dynamic accretion processes are still active well into the optically visible stages of star formation. Provided the mass is deposited at radii sufficiently close to the young stars, estimates of the accretion rates indicate that infall may add enough material to the system to account for the FU Orionis type flares recently observed in T Tau in ≾ 100 yr.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1086/187307DOIUNSPECIFIED
http://adsabs.harvard.edu/abs/1994ApJ...425L..45VPublisherUNSPECIFIED
Additional Information:© 1994 American Astronomical Society. Provided by the NASA Astrophysics Data System. Received 1993 December 14; accepted 1994 January 25. The authors would like to thank the JCMT, IRAM, and OVRO staff. OVRO is operated under funding from the NSF, contract 90-16404. Frank Helmich is thanked for carrying out the JCMT observations. E. vD. and H. J. vL. acknowledge support from the Netherlands Organization for Scientific Research (NWO), and G. A. B. from the David and Lucille Packard and Alfred P. Sloan Foundations, as well as NASA grant NAGW-2297.
Funders:
Funding AgencyGrant Number
NSF90-16404
Netherlands Organization for Scientific Research (NWO)UNSPECIFIED
David and Lucile Packard FoundationUNSPECIFIED
Alfred P. Sloan FoundationUNSPECIFIED
NASANAGW-2297
Subject Keywords:stars: pre-main-sequence; stars: formation; ISM: molecules
Record Number:CaltechAUTHORS:20120918-090118190
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20120918-090118190
Official Citation:Evidence for HCO(+) infall toward T Tauri? van Langevelde, Huib Jan; van Dishoeck, Ewine F.; Blake, Geoffrey A. Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 425, no. 1, p. L45-L48
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:34163
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:18 Sep 2012 16:30
Last Modified:29 Aug 2014 14:47

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