2007A&A...466.1111G


C.D.S. - SIMBAD4 rel 1.7 - 2020.08.04CEST00:20:10

2007A&A...466.1111G - Astronomy and Astrophysics, volume 466, 1111-1121 (2007/5-2)

X-ray emission from classical T Tauri stars: accretion shocks and coronae?

GUENTHER H.M., SCHMITT J.H.M.M., ROBRADE J. and LIEFKE C.

Abstract (from CDS):

Classical T Tauri stars (CTTS) are surrounded by actively accreting disks. According to current models material falls along the magnetic field lines from the disk with more or less free-fall velocity onto the star, where the plasma heats up and generates X-rays. We want to quantitatively explain the observed high energy emission and measure the infall parameters from the data. Absolute flux measurements allow to calculate the filling factor and the mass accretion rate.We use a numerical model of the hot accretion spot and solve the conservation equations. A comparison to data from XMM-Newton and Chandra shows that our model reproduces the main features very well. It yields for TW Hya a filling factor of 0.3% and a mass accretion rate 2x10–10M/yr.

Abstract Copyright:

Journal keyword(s): accretion, accretion disks - methods: numerical - stars: pre-main sequence - stars: late-type - stars: individual: TW Hya - X-rays: stars

Simbad objects: 5

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Number of rows : 5

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 V* BP Tau Or* 04 19 15.8342975037 +29 06 26.929456808   13.13 12.12 11.89   K5/7Ve 599 0
2 V* TW Hya TT* 11 01 51.9054298616 -34 42 17.031550898   11.94 10.50 10.626 9.18 K6Ve 1534 1
3 NAME TW Hya Association As* 11 01.9 -34 42           ~ 819 0
4 CD-33 7795 TT* 11 31 55.2603055856 -34 36 27.214242128   12.97 11.524 11.150 9.150 M2Ve 176 0
5 HD 319139 BY* 18 14 10.4818974563 -32 47 34.516106830   11.47 10.68   9.11 K5+K7 291 0

    Equat.    Gal    SGal    Ecl

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2020.08.04-00:20:10

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