2007A&A...468..485F


Query : 2007A&A...468..485F

2007A&A...468..485F - Astronomy and Astrophysics, volume 468, 485-499 (2007/6-3)

Spectral properties of X-ray bright variable sources in the Taurus molecular cloud.

FRANCIOSINI E., PILLITTERI I., STELZER B., MICELA G., BRIGGS K.R., SCELSI L., TELLESCHI A., AUDARD M., PALLA F. and GUEDEL M.

Abstract (from CDS):

We analyze 19 bright variable X-ray sources detected in the XMM-Newton Extended Survey of the Taurus Molecular Cloud (XEST), to characterize the variations with time of their coronal properties and to derive information on the X-ray emitting structures. We performed time-resolved spectroscopy of the EPIC PN and MOS spectra of the XEST sources, using a model with one or two thermal components, and we used the time evolution of the temperatures and emission measures during the decay phase of flares to derive the size of the flaring loops. The light curves of the selected sources show different types of variability: flares, long-lasting decay or rise through the whole observation, and slow modulation or complex flare-like variability. Spectral analysis shows typical quiescent plasma temperatures of ∼5-10MK and ∼15-35MK; the cool component generally remains constant, while the observed flux changes are due to variations of the hot component. During flares the plasma reaches temperatures up to 100 MK and luminosities up to ∼1031erg/s. Loop sizes inferred from flare analysis are generally smaller than or comparable to the stellar radius.

Abstract Copyright:

Journal keyword(s): stars: coronae - stars: late-type - stars: pre-main sequence - X-rays: stars

Simbad objects: 20

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Number of rows : 20
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* V410 Tau Or* 04 18 31.1083261392 +28 27 16.155411536   12.13 10.75 8.45 9.408 K3Ve 438 0
2 V* V892 Tau Ae* 04 18 40.6120892867 +28 19 15.641672501   16.6 14.69 14.35   A0Ve 273 0
3 [SS94] V410 X-ray 7 TT* 04 18 42.4993698860 +28 18 49.913254563       18.02 15.42 ~ 37 0
4 V* V1023 Tau Or* 04 18 47.0296109602 +28 20 07.490327496   14.31 12.00 11.21   K7 149 0
5 V* BP Tau Or* 04 19 15.8342975037 +29 06 26.929456808   13.13 12.12 11.89   K5/7Ve 621 0
6 WK81 1 TT* 04 19 26.2671630797 +28 26 14.259129092   14.81 13.04 12.240   K7 200 1
7 [GBA2007] 680 PM* 04 19 56.7796176451 +27 14 48.862501986           ~ 2 0
8 HD 283572 Or* 04 21 58.8482823933 +28 18 06.511915195   9.80 9.03 9.14   G5IVe 272 0
9 V* FS Tau Or* 04 22 02.1925017485 +26 57 30.331063489 17.57   14.10 15.63   M3.5e+M0e 265 0
10 V* DH Tau Or* 04 29 41.5520056304 +26 32 58.123761109 15.14 14.62 13.10 13.01   M1Ve 277 0
11 HD 285845 Or* 04 31 25.1252400430 +18 16 16.728688205   11.06 10.31     G5 32 0
12 V* XZ Tau Or* 04 31 40.0868968022 +18 13 56.642439056     10.40 13.12   M2e+M2e 419 1
13 L 1551-51 Or* 04 32 09.2838548075 +17 57 22.695083303   13.29       K7e 121 0
14 V* V830 Tau TT* 04 33 10.0299730541 +24 33 43.255853678   13.91 12.08 11.30   M0-1 187 1
15 2MASS J04341099+2251445 TT* 04 34 10.9942832092 +22 51 44.397944183     15.19     M1.5 43 0
16 V* DN Tau Or* 04 35 27.3776240781 +24 14 58.908761629 13.56 12.88 11.50 11.79   M1:Ve 358 0
17 V* HQ Tau Or* 04 35 47.3327991214 +22 50 21.639107658 15.01 14.15 12.02 11.18   K0 85 0
18 HD 283810 PM* 04 40 09.2276971742 +25 35 32.608722133 13.00 11.744 10.626     K5 27 0
19 NAME Taurus Complex SFR 04 41.0 +25 52           ~ 3785 0
20 V* V397 Aur Or* 04 56 02.0261376554 +30 21 03.635056925   13.07 11.72 11.25   K7e 157 0

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2021.10.16-22:43:44

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