2007A&A...468..477A


Query : 2007A&A...468..477A

2007A&A...468..477A - Astronomy and Astrophysics, volume 468, 477-484 (2007/6-3)

Statistics of superimposed flares in the Taurus molecular cloud.

ARZNER K., GUEDEL M., BRIGGS K., TELLESCHI A. and AUDARD M.

Abstract (from CDS):

Stochastically occurring flares provide a possible mechanism of coronal heating in magnetically active stars such as T Tauri objects in star-forming regions. We investigate the statistics of stellar X-ray light curves from the XMM-Newton Extended Survey of the Taurus Molecular Cloud (XEST). To this end, the light curve is modeled as superimposed flares occurring at random times and with random amplitudes. The flare shape is estimated non-parametrically from the observations, while the flare amplitude distribution is modeled as a truncated power law, and the flare times are assumed as uniformly distributed. From these model assumptions, predictions on the binned counts are derived and compared with the observations. From a sample of 22 XEST observations matching the above model assumptions we find that the majority of cases have flare amplitude distributions with slopes steeper than two. This favours the role of small flares in coronal heating for 5 targets, of which, however, 4 are foreground or background main-sequence stars.

Abstract Copyright:

Journal keyword(s): methods: statistical - stars: coronae - stars: pre-main sequence - X-rays: stars

Simbad objects: 28

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Number of rows : 28
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 IRAS 04016+2610 Y*O 04 04 43.07064 +26 18 56.3904           ~ 246 0
2 V* V1096 Tau TT* 04 13 27.2218223808 +28 16 24.656012868   15.42 13.53 13.07   M0 76 0
3 HD 283447 Or* 04 14 12.9261150912 +28 12 12.359055168 13.17 12.07 10.68 9.45 8.67 K3Ve 395 0
4 UCAC4 591-011866 TT* 04 14 52.310472 +28 05 59.69616 19.87         M3.1 25 0
5 V* DI Tau Or* 04 29 42.4723379736 +26 32 49.128692676 16.39 15.20 13.60     M0Ve 203 0
6 LP 415-1166 PM* 04 31 05.810832 +18 03 21.14316   17.22 15.86 15.67   ~ 13 1
7 HD 285845 Or* 04 31 25.1383575216 +18 16 16.731197940   11.06 10.31     G5 32 0
8 V* HL Tau Or* 04 31 38.5107609312 +18 13 57.859747968   15.89 14.49 14.39   K5 1319 0
9 IRAS 04287+1807 mul 04 31 38.8 +18 13 57           ~ 796 0
10 V* V710 Tau Y*O 04 31 57.79 +18 21 37.9           ~ 157 0
11 V* V710 Tau A TT* 04 31 57.8028713880 +18 21 34.732161936       13.87   M2/3e 161 0
12 V* V807 Tau Or* 04 33 06.6358574736 +24 09 54.977968116   12.10 11.21 11.18   K7 139 2
13 V* GK Tau Or* 04 33 34.5630097872 +24 21 05.855136732 15.50   13.00 12.02 10.62 K7:Ve 287 0
14 V* IT Tau Y*O 04 33 54.70128 +26 13 27.5232   16.76 14.63     K6.0 94 0
15 V* IT Tau A Y*O 04 33 54.7115553456 +26 13 27.489035208 18.01         K3 19 0
16 2MASS J04345693+2258358 Y*O 04 34 56.9315751792 +22 58 35.724910224           ~ 22 0
17 V* EZ Tau Er* 04 35 13.1772657408 +22 59 20.380452792   18.3   15.63   M4.75V 30 0
18 HD 29050 PM* 04 35 17.2307371464 +23 02 42.627560928   9.67 8.9     G8V 27 0
19 V* DN Tau Or* 04 35 27.3776226144 +24 14 58.910343720 13.56 12.88 11.50 11.79   M1:Ve 367 0
20 NAME CoKu Tau 3 TT* 04 35 40.937952 +24 11 08.49012 20.58         M4.3 98 0
21 V* HQ Tau Or* 04 35 47.3357318616 +22 50 21.686966484 15.01 14.15 12.02 11.18   K0 94 0
22 V* HP Tau Or* 04 35 52.7819078592 +22 54 23.156947512 17.39 14.9 14.90     K2-5e 202 1
23 CoKu HP Tau G3 TT* 04 35 53.4988337112 +22 54 09.005027328 18.21   14.8     M0.6 66 0
24 CoKu HP Tau G2 Or* 04 35 54.1535049648 +22 54 13.426506072 13.63 12.31 11.158 10.14 9.172 G2e 120 0
25 NAME Taurus Complex SFR 04 41.0 +25 52           ~ 3926 0
26 V* V999 Tau Or* 04 42 05.4915414000 +25 22 56.286176484 18.68 15.1 14.7     M0.6 78 0
27 HD 31395 * 04 52 34.7608426872 -54 19 35.418709236   9.16 8.73     F3V 5 0
28 HD 31305 * 04 55 48.2312009712 +30 20 16.446564852   7.70 7.60     A0 38 0

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2022.05.28-01:01:32

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