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Speckle Imaging Measurements of the Relative Tangential Velocities of the Components of T Tauri Binary Stars

Ghez, A. M. and Weinberger, A. J. and Neugebauer, G. and Matthews, K. and McCarthy, D. W., Jr. (1995) Speckle Imaging Measurements of the Relative Tangential Velocities of the Components of T Tauri Binary Stars. Astronomical Journal, 110 (2). pp. 753-765. ISSN 0004-6256. https://resolver.caltech.edu/CaltechAUTHORS:20180130-113452362

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Abstract

Over a five year period, we have used speckle imaging to monitor 20 T Tauri binary stars with separations ranging from 0".09 to 1" (13-140 AU). This project is aimed at detecting the relative motion of the component stars to ascertain whether or not the observed companions (1) are stellar in nature, as opposed to being HH objects, and (2) are gravitationally bound to the primary stars. These observations demonstrate that speckle imaging measurements of close binary stars' separations can be made with an accuracy of a few milliarcseconds. The majority of the observed systems show significant relative velocities which (1) are not consistent with the motion expected for HH objects, (2) are greater than the velocity dispersion of these star-forming regions and thus are not the result of differential proper motion, and (3) are consistent with orbital motion. This is the first demonstration that these systems are physically bound. Furthermore, these relative velocity measurements provide dynamical evidence that the average total mass of these T Tauri binary star systems is ~l.7M_⊙.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1086/117560DOIArticle
http://adsabs.harvard.edu/abs/1995AJ....110..753GADSArticle
ORCID:
AuthorORCID
Ghez, A. M.0000-0003-3230-5055
Additional Information:© 1995 American Astronomical Society. Received 1995 January 23; revised 1995 April 13. We thank the staff of the Steward 90" and Palomar Observatories, especially the night assistants Juan Carrasco, Dennis Means, and Vic Hansen, and an anonymous referee for helpful comments. A.G. receives support from NASA through Grant No. HF-1031.01-92A awarded by the Space Telescope Science Institute which is operated by the Association of Universities for Research in Astronomy, Inc., for NASA under Contract No. NAS5-26555. D.W.M. is supported by NSF under Grant No. AST92-03336. Infrared astronomy at Caltech is supported by a grant from NSF and A.W. is supported through the NASA Graduate Student Researchers Program.
Funders:
Funding AgencyGrant Number
NASAHF-1031.01-92A
NASANAS5-26555
NSFAST92-03336
NSFUNSPECIFIED
NASA Graduate Student Research FellowshipUNSPECIFIED
Issue or Number:2
Record Number:CaltechAUTHORS:20180130-113452362
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20180130-113452362
Official Citation:Speckle Imaging Measurements of the Relative Tangential Velocities of the Components of T Tauri Binary Stars Ghez, A. M.; Weinberger, A. J.; Neugebauer, G.; Matthews, K.; McCarthy, D. W., Jr. Astronomical Journal v.110, p.753-765 1985.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:84580
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:31 Jan 2018 18:19
Last Modified:04 Nov 2019 02:47

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