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Analysis of HST ultraviolet spectra for T Tauri stars: Estimating the interstellar extinction and the contribution from an accretion shock to the emission-continuum formation

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Analysis of HST ultraviolet spectra for T Tauri stars: Estimating the interstellar extinction and the contribution from an accretion shock to the emission-continuum formation

Content Provider	Springer Nature Link
Author	Kravtsova, A. S. Lamzin, S. A.
Copyright Year	2002
Abstract	We analyzed the spectra of eight T Tauri stars (T Tau, RY Tau, CO Ori, EZ Ori, GW Ori, GX Ori, V1044 Ori, and SU Aur) in the wavelength range from 1200 to 3100 Å taken with the STIS spectrograph from the Hubble Space Telescope. For each star, we found an upper limit on the interstellar extinction A $_{ v }$, which proved to be lower than the values obtained by different authors from optical observations. For T Tau and RY Tau, we found the upper limits on their luminosities, masses, and radii as well as the bolometric luminosity of the excess emission continuum. The latter is most likely associated with mass accretion from a protoplanetary disk. We show that the bulk of the emission continuum is radiated in the infrared. For these stars, we determined the ratio of the flux in the C IV 1550 doublet lines to the excess-continuum flux. This ratio proved to be two orders of magnitude lower than its values predicted by the accretion-shock (AS ) models developed by Lamzin (1998) and Calvet and Gullbring (1998). This result leads us to believe that for T Tau and RY Tau, the emission continuum originates in the accretion disk and/or in the boundary layer rather than in the AS, as has been assumed previously. This implies that in these stars, only a small fraction of the accreted matter passes through the AS, while the bulk of this matter settles in the equatorial plane of the star, passing through the boundary layer.
Starting Page	835
Ending Page	842
Page Count	8
File Format	PDF
ISSN	10637737
Journal	Astronomy Letters
Volume Number	28
Issue Number	12
e-ISSN	15626873
Language	English
Publisher	Nauka/Interperiodica
Publisher Date	2002-01-01
Publisher Place	Moscow
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	stars T Tauri stars disk accretion stellar wind Astronomy Astrophysics
Content Type	Text
Resource Type	Article
Subject	Astronomy and Astrophysics Space and Planetary Science

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