2007A&A...473..589S


C.D.S. - SIMBAD4 rel 1.7 - 2019.11.14CET23:57:26

2007A&A...473..589S - Astronomy and Astrophysics, volume 473, 589-601 (2007/10-2)

Coronal abundances of X-ray bright pre-main sequence stars in the Taurus Molecular Cloud.

SCELSI L., MAGGIO A., MICELA G., BRIGGS K. and GUEDEL M.

Abstract (from CDS):

We studied the thermal properties and chemical composition of the X-ray emitting plasma of a sample of bright members of the Taurus Molecular Cloud to investigate possible differences among classical and weak-lined T Tauri stars, and possible dependences of the abundances on the stellar activity level and/or on the presence of accretion/circumstellar material. We used medium-resolution X-ray spectra obtained with the sensitive EPIC/PN camera in order to analyze the possible sample. The PN spectra of 20 bright (LX∼1030-1031erg/s) Taurus members, with at least ∼4500 counts, were fitted using thermal models of optically thin plasma with two components and variable abundances of O, Ne, Mg, Si, S, Ar, Ca, and Fe. Extensive preliminary investigations were employed to study the performances of the PN detectors regarding abundance determinations, and finally to check the results of the fittings. We found that the observed X-ray emission of the studied stars can be attributed to coronal plasma having similar thermal properties and chemical composition both in the classical and in the weak-lined T Tauri stars. The results of the fittings did not reveal a correlation between the abundance patterns and activity or accretion/disk presence. The iron abundance of these active stars is significantly lower than the solar photospheric value (∼0.2solar). An indication of slightly different coronal properties in stars with different spectral type is found in this study. G-type and early K-type stars have, on average, slightly higher Fe abundances (Fe∼0.24solar) than stars with later spectral type (Fe∼0.15solar), confirming previous findings from high-resolution X-ray spectroscopy. Stars of the former group are also found to have, on average, hotter coronae.

Abstract Copyright:

Journal keyword(s): X-rays: stars - stars: activity - open clusters and associations: individual: Taurus molecular cloud - stars: abundances - stars: coronae - stars: pre-main-sequence

Simbad objects: 34

goto Full paper

goto View the reference in ADS

Number of rows : 34

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 * eps Eri BY* 03 32 55.8449634 -09 27 29.731165 5.19 4.61 3.73 3.00 2.54 K2V 1659 1
2 * zet Per V* 03 54 07.9224751 +31 53 01.081262 2.19 2.97 2.85 2.71 2.62 B1Ib 810 0
3 V* V1096 Tau TT* 04 13 27.2226142854 +28 16 24.653683705   15.61 12.69 11.90   M0 70 0
4 NAME [BM89] L1495 PoC 04 14 08.2 +28 09 31           ~ 170 0
5 HD 283447 TT* 04 14 12.9232870093 +28 12 12.378540314 13.17 12.07 10.68 9.45 8.67 K3Ve 374 0
6 LDN 1495 DNe 04 18.1 +27 37           ~ 276 1
7 V* V410 Tau TT* 04 18 31.1083261392 +28 27 16.155411536   12.13 10.75 8.45 9.408 K3Ve 417 0
8 V* V892 Tau Ae* 04 18 40.6120892867 +28 19 15.641672501   16.6 14.69 14.35   A0Ve 255 1
9 V* V1023 Tau TT* 04 18 47.0296109602 +28 20 07.490327496   14.31 12.00 11.21   K7 136 0
10 V* BP Tau TT* 04 19 15.8342975037 +29 06 26.929456808   13.13 12.12 11.89   K5/7Ve 584 0
11 WK81 1 TT* 04 19 26.2671630797 +28 26 14.259129093   14.81   12.240   K7 190 1
12 V* RY Tau TT* 04 21 57.4132838427 +28 26 35.533990877 10.82 10.34 9.30 9.67 8.87 K1IV/Ve 634 1
13 HD 283572 TT* 04 21 58.8482823933 +28 18 06.511915195   9.80 9.03 9.14   G5IVe 262 0
14 V* T Tau TT* 04 21 59.4323326335 +19 32 06.439974179   11.01 9.30 9.80   K0IV/Ve 1239 2
15 2MASS J04220496+1934483 TT* 04 22 04.9622706671 +19 34 48.399184904           M3.5 19 0
16 V* DH Tau TT* 04 29 41.558 +26 32 58.27 15.14 14.62 13.10 13.01   M1Ve 256 1
17 L 1551-51 TT* 04 32 09.2838548075 +17 57 22.695083303   13.29       K7e 115 0
18 V* V826 Tau TT* 04 32 15.8394065935 +18 01 38.751126168   13.51 12.074   10.312 K7.0 161 0
19 V* V928 Tau TT* 04 32 18.8839760967 +24 22 26.713747659 17.65   13.7     M0.5 78 0
20 WK81 2 TT* 04 33 10.0299730541 +24 33 43.255853678   13.91 12.08 11.30   M0-1 166 1
21 V* IT Tau TT* 04 33 54.701 +26 13 27.52           K6.0 82 0
22 V* DN Tau TT* 04 35 27.3776240781 +24 14 58.908761629 13.56 12.88 11.50 11.79   M1:Ve 338 0
23 NAME CoKu Tau 3 TT* 04 35 40.938 +24 11 08.76 20.58   17.3     M4.3 89 0
24 [BLH2002] KPNO-Tau 15 Y*O 04 35 51.0969566842 +22 52 40.063846807 19.75         M3Ve 23 0
25 CoKu HP Tau G2 TT* 04 35 54.1553246504 +22 54 13.404170652 13.63 12.31 11.158 10.14 9.172 G2e 109 0
26 NAME Taurus Dark Cloud SFR 04 41.0 +25 52           ~ 3322 0
27 V* SU Aur TT* 04 55 59.3861369488 +30 34 01.499800471   10.33 9.30 9.17   G2IIIne 524 0
28 HD 36705 TT* 05 28 44.8916324761 -65 26 55.289846904 8.259 7.856 6.999 6.496 5.993 K0V 910 0
29 NAME Orion Nebula Cluster OpC 05 35.0 -05 29           ~ 1907 1
30 V* TW Hya TT* 11 01 51.9054298616 -34 42 17.031550898   11.94 10.50 10.626 9.18 K6Ve 1447 1
31 CD-33 7795 TT* 11 31 55.2603055856 -34 36 27.214242128   12.97 11.524 11.150 9.150 M2Ve 168 0
32 CPD-68 1894 TT* 13 22 07.5420267499 -69 38 12.216304202   11.38 10.393   9.117 K1Ve 123 0
33 * alf Cen ** 14 39 29.71993 -60 49 55.9990   0.4 -0.1     G2V+K1V 792 0
34 * ksi Boo BY* 14 51 23.37993 +19 06 01.6994 5.618 5.370 4.593 3.91 3.48 G7Ve+K5Ve 428 0

    Equat.    Gal    SGal    Ecl

To bookmark this query, right click on this link: simbad:objects in 2007A&A...473..589S and select 'bookmark this link' or equivalent in the popup menu


2019.11.14-23:57:26

© Université de Strasbourg/CNRS

    • Contact