2005A&A...439.1149A


C.D.S. - SIMBAD4 rel 1.7 - 2021.02.24CET19:02:16

2005A&A...439.1149A - Astronomy and Astrophysics, volume 439, 1149-1158 (2005/9-1)

XMM-Newton spectroscopy of the metal depleted T Tauri star TWA 5.

ARGIROFFI C., MAGGIO A., PERES G., STELZER B. and NEUHAEUSER R.

Abstract (from CDS):

We present results of X-ray spectroscopy for TWA 5, a member of the young TW Hydrae association, observed with XMM-Newton. TWA 5 is a multiple system which shows Hα emission, a signature typical of classical T Tauri stars, but no infrared excess. From this analysis of the RGS and EPIC spectra, we have derived the emission measure distribution vs. temperature of the X-ray emitting plasma, its abundances, and the electron density. The characteristic temperature and density of the plasma suggest a corona similar to that of weak-line T Tauri stars and active late-type main sequence stars. TWA 5 also shows low iron abundance (∼0.1 times the solar photospheric one) and a pattern of increasing abundances for elements with increasing first ionization potential reminiscent of the inverse FIP effect observed in highly active stars. The especially high ratio Ne/Fe∼10 is similar to that of the classical T Tauri star TW Hya, where the accreting material has been held responsible for the X-ray emission. We discuss the possible role of an accretion process in this scenario. Since all T Tauri stars in the TW Hydrae association studied so far have very high Ne/Fe ratios, we also propose that environmental conditions may cause this effect.

Abstract Copyright:

Journal keyword(s): X-rays: stars - techniques: spectroscopic - stars: activity - stars: abundances - stars: pre-main sequence - stars: individual: TWA 5

VizieR on-line data: <Available at CDS (J/A+A/439/1149): tablea1.dat>

Simbad objects: 13

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Number of rows : 13

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 V* UX Ari RS* 03 26 35.3764089427 +28 42 54.211100955 7.76 7.28 6.37     K0IV 668 0
2 HD 22468 RS* 03 36 47.2911034958 +00 35 15.938962144 7.09 6.63   5.4   K2:Vnk 1132 0
3 V* BP Tau Or* 04 19 15.8342975037 +29 06 26.929456808   13.13 12.12 11.89   K5/7Ve 613 0
4 HD 283572 Or* 04 21 58.8482823933 +28 18 06.511915195   9.80 9.03 9.14   G5IVe 271 0
5 LDN 1551 DNe 04 31 30.0 +18 12 30           ~ 779 1
6 V* TW Hya TT* 11 01 51.9054298616 -34 42 17.031550898   11.94 10.50 10.626 9.18 K6Ve 1594 1
7 NAME TW Hya Association As* 11 01.9 -34 42           ~ 839 0
8 HD 98800B SB* 11 22 05.288454 -24 46 39.04974   11.18 9.92     ~ 113 1
9 HD 98800 RS* 11 22 05.28975 -24 46 39.7571   10.20 9.28 9.26 7.386 K5V(e) 335 0
10 CD-33 7795B LM* 11 31 55.2500 -34 36 25.200     20.40   15.8 M8.5/9e 119 0
11 CD-33 7795 TT* 11 31 55.2603055856 -34 36 27.214242128   12.97 11.524 11.150 9.150 M2Ve 178 0
12 V* PZ Tel BY* 18 53 05.8733807460 -50 10 49.901380086   9.22 8.342   7.464 G9IV 294 0
13 HD 224085 RS* 23 55 04.0516465022 +28 38 01.248194500 8.88 8.20   6.9   K2+IVeFe-1 690 0

    Equat.    Gal    SGal    Ecl

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2021.02.24-19:02:16

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