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How hot is the wind from TW Hydrae?

Johns-Krull, Christopher M. and Herczeg, Gregory J. (2007) How hot is the wind from TW Hydrae? Astrophysical Journal, 655 (1). pp. 345-350. ISSN 0004-637X. doi:10.1086/508770.

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It has recently been suggested that the winds from classical T Tauri stars in general, and the wind from TW Hya in particular, reaches temperatures of 300,000 K while maintaining a mass-loss rate of ~10^(-11) M⊙ yr^(-1) or larger. If confirmed, this would place strong new requirements on wind launching and heating models. We therefore reexamine spectra from the Space Telescope Imaging Spectrograph aboard the Hubble Space Telescope and spectra from the Far Ultraviolet Spectroscopic Explorer satellite in an effort to better constrain the maximum temperature in the wind of TW Hya. We find clear evidence for a wind in the C II doublet at 1037 Å and in the C II multiplet at 1335 Å. We find no wind absorption in the C IV λ1550 doublet observed at the same time as the C II λ1335 line or in observations of O VI observed simultaneously with the C II λ1037 line. The presence or absence of C III wind absorption is ambiguous. The clear lack of a wind in the C IV line argues that the wind from TW Hya does not reach the 100,000 K characteristic formation temperature of this line. We therefore argue that the available evidence suggests that the wind from TW Hya, and perhaps all classical T Tauri stars, reaches a maximum temperature in the range of 10,000 - 30,000 K.

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Herczeg, Gregory J.0000-0002-7154-6065
Additional Information:© 2007 The American Astronomical Society. Received 2006 July 25; accepted 2006 August 30. We would like to acknowledge several useful comments from an anonymous referee. C. M. J.-K. acknowledges partial support through program AR-9933 provided by NASA through a grant from the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS5-26555. G. J. H. acknowledges partial support from FUSE program GO-C067, provided by NASA contract NAS5-32985. This work is based on observations with the NASA/ESA Hubble Space Telescope, obtained at the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS5-26555. These observations are associated with program GTO-7718. This work is also based on observations made with the NASA/CNES/CSA Far Ultraviolet Spectroscopic Explorer, which is operated for NASA by the Johns Hopkins University under NASA contract NAS5-32985.
Funding AgencyGrant Number
Space Telescope Science InstituteAR-9933
Subject Keywords:accretion, accretion disks; stars: individual (TW Hydrae); stars: mass loss; stars: pre-main-sequence
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Record Number:CaltechAUTHORS:JOHapj07
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:13432
Deposited By: Tony Diaz
Deposited On:16 Jun 2009 19:37
Last Modified:08 Nov 2021 22:37

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