1997A&A...320..525P


Query : 1997A&A...320..525P

1997A&A...320..525P - Astronomy and Astrophysics, volume 320, 525-539 (1997/4-2)

ROSAT coronal temperatures of young late type stars.

PREIBISCH T.

Abstract (from CDS):

We analyze ROSAT X-ray spectra of a sample of young late type stars by fitting them with a continuous emission measure model with power-law temperature dependence up to a maximum temperature. This model gives successful fits to all spectra of our sample. While most of the spectra can also fitted equally successful with the frequently used two temperature model, we argue and provide evidence that the continuous temperature distribution model probably describes the coronal temperature structure in a more meaningful way. From our fitting results we find a very good correlation between the X-ray surface flux and the maximum coronal temperature with the functional form FX∝Tmax(2.2±0.2) . This correlation extends over several orders of magnitude and is valid for the very young T Tauri stars as well as for the much older young main sequence stars in our sample. Since the X-ray surface flux is a good measure of the stellar activity and shows a clear dependence on the stellar rotational velocity, the correlation means that the coronal temperature is related to the X-ray activity and ultimately determined by stellar rotation. Finally, we interpret our results with a simple analytic loop model and find that the coronae of the active young stars are probably dominated by loops with generally higher pressure as compared to typical solar active region loops.

Abstract Copyright:

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

CDS comments: Table 2: in Hyades L86 not identified

Simbad objects: 62

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Number of rows : 62
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 * 9 Cet BY* 00 22 51.7884553555 -12 12 33.969921319 7.29 7.05 6.39     G2.5V 467 0
2 * bet Hyi PM* 00 25 45.07036 -77 15 15.2860 3.52 3.41 2.79 2.28 1.94 G0V 576 0
3 * kap01 Cet BY* 03 19 21.6963205 +03 22 12.715139 5.71 5.52 4.85 4.27 3.91 G5V 848 0
4 V* V1272 Tau BY* 03 44 03.5401148472 +24 30 15.284314404   11.8 10.762   9.933 G1V 67 0
5 V* V1038 Tau BY* 03 44 20.0898026064 +24 47 46.205031408   11.2 10.4 10.3   G1-2V 115 0
6 V* OU Tau Y*O 03 45 32.9384507520 +24 18 11.646083268   14.63 13.36   12.02 K4V 89 0
7 V* V1041 Tau Y*O 03 45 39.4002482160 +23 45 15.469362576 14.355 13.52 12.41 11.99 10.83 G9V 57 0
8 V* V855 Tau Y*O 03 45 40.1782648536 +24 37 38.007136704   10.6 9.9   9.05 F9V 84 1
9 V* V969 Tau BY* 03 45 42.1185203606 +24 54 21.622880032   10.18 9.56   8.82 G0V 123 1
10 Cl Melotte 22 761 Y*O 03 45 44.4132583272 +24 13 13.134939060   11.22 10.55   9.77 G2V 61 0
11 Cl Melotte 22 OpC 03 46 24 +24 06.8           ~ 3184 0
12 V* V1171 Tau BY* 03 46 28.4126681592 +24 26 02.158117512   11.85 11.10 10.5 10.26 G5V 70 1
13 V* V642 Tau Er* 03 46 37.284936 +24 20 36.71124   13.362 12.321 11.964 10.97 K5V 70 0
14 V* V1065 Tau RS* 03 46 40.2476949552 +23 29 51.877806648 14.016 13.01 12.02   10.93 G7V 68 0
15 V* V545 Tau Y*O 03 48 49.3174984680 +23 58 38.132788908   13.61 12.65   11.50 K2.5e 78 0
16 V* V1282 Tau RS* 03 49 06.1083396552 +23 46 52.469922972   11.63 10.803 9.8 9.831 G7IV 79 0
17 HD 23964C PM* 03 49 57.4472485560 +23 50 49.472030616   10.95 10.54 9.71   G0Ve 25 0
18 V* V679 Tau TT* 03 52 02.2372961328 +24 39 47.681148816   13.57 11.41 11.89 10.77 K5e 122 0
19 HD 26784 PM* 04 14 34.3409896608 +10 42 04.993916796   7.606 7.080 6.791 6.511 F8V 182 0
20 HD 27483 WD* 04 20 52.7204196432 +13 51 51.933419460   6.603 6.141 5.876 5.630 DA3+F6V 172 0
21 HD 27561 PM* 04 21 34.7949333144 +14 24 35.240373612   6.999 6.578 6.338 6.099 F5IV-V 215 0
22 HD 27691 ** 04 22 44.17133 +15 03 21.9218 7.65 7.576 7.084 7.58   G0V 194 0
23 Cl* Melotte 25 VR 6 Er* 04 23 50.3729359200 +14 55 17.509355040   14.85 13.348 13.08   M3.5V 41 0
24 V* V895 Tau BY* 04 24 12.4710867960 +14 45 29.565731196   8.217 7.583 8.43   G0V(e) 217 0
25 * 70 Tau SB* 04 25 37.3225242048 +15 56 27.683560428   6.951 6.439 7.75   F7V 264 0
26 V* V992 Tau PM* 04 26 05.8393913496 +15 31 27.634430748 8.11 8.027 7.472 7.161 6.858 ~ 146 0
27 * 71 Tau dS* 04 26 20.7708204936 +15 37 05.884087620   4.758 4.480 5.96 4.15 F0V 215 0
28 HD 28099 BY* 04 26 40.1217122952 +16 44 48.885808416 8.98 8.78 8.12 7.56 7.23 G2+V 390 0
29 * tet01 Tau SB* 04 28 34.4960341 +15 57 43.849432 5.510 4.780 3.840 5.48   G9IIIFe-0.5 479 0
30 V* V994 Tau BY* 04 28 50.8141439320 +16 17 20.183418331   12.001 10.698 10.349   K4V 61 0
31 HD 28363 ** 04 28 59.7394076568 +16 09 32.714425728   7.101 6.565 6.258 5.966 F8V 186 0
32 HD 28394 SB* 04 29 20.5589466330 +17 32 41.834829803   7.512 7.007 6.724 6.434 F8V 133 0
33 Cl Melotte 25 OpC 04 29 47 +16 56.9           ~ 2843 0
34 HD 28634 SB* 04 31 37.1140625232 +17 42 35.045618328   10.515 9.517 9.43   K2V 79 0
35 V* KM Ori Or* 05 34 55.9724775000 -05 23 13.041837816 14.142 12.883 11.918   10.064 K5Ve 93 0
36 NAME Orion Nebula Cluster OpC 05 35.0 -05 29           ~ 2136 1
37 V* LQ Ori Or* 05 35 10.7315904000 -05 23 44.694430944 15.088 13.527 12.455   10.159 K8 70 1
38 Brun 656 Y*O 05 35 21.3152972328 -05 12 12.609578520 13.057 12.043 11.225   9.538 G2III 60 0
39 * chi01 Ori RS* 05 54 22.9829893 +20 16 34.222038 5.08 5.00 4.40 3.90 3.59 G0V 824 0
40 HD 74009 * 08 39 03.3941906520 -52 42 39.709905264   9.51 9.37 9.48   F3V 29 0
41 * pi.01 UMa BY* 08 39 11.7046112880 +65 01 15.263122512 6.33 6.26 5.64 5.12 4.79 G0.5V 540 0
42 IC 2391 OpC 08 41 10 -52 59.5           ~ 766 0
43 V* V366 Vel BY* 08 41 25.8875436000 -53 22 41.467632456   13.63 12.519   11.277 K3e 30 0
44 CD-52 2501 * 08 42 12.2935097520 -53 06 03.797278668           F5V 29 0
45 BYB 3 Y*O 10 58 05.5281106776 -77 28 24.088190340   13.1 12.26 11.49   G0/K4V 14 0
46 Hen 3-545 Or* 10 59 06.9715593000 -77 01 40.309233240   12.91 11.136   9.596 K4Ve 199 0
47 V* CS Cha Or* 11 02 24.8763629208 -77 33 35.667131796   12.88 11.69   10.123 K2Ve 210 0
48 Ass Cha T 2-21 TT* 11 06 15.3471261840 -77 21 56.720362608   12.58 11.01   9.35 G5Ve 129 0
49 NAME Cha 1 MoC 11 06 48 -77 18.0           ~ 1058 1
50 V* VW Cha Or* 11 08 01.3974165580 -77 42 28.579297348 13.91 14.04 12.80   10.69 K7+M0 172 0
51 V* HP Cha Or* 11 08 15.216432 -77 33 53.17020   14.33 12.77 12.11   K3+G5e 102 0
52 V* HP Cha A * 11 08 15.4974157248 -77 33 53.446498956           K6e 81 0
53 Sz 30 TT* 11 09 11.72304 -77 29 12.4836   14.89 13.28 13.02 11.032 M2.5+M2 51 0
54 Ass Cha T 2-54 TT* 11 12 42.6709132056 -77 22 22.943489160     11.103   9.653 G8+K7 81 2
55 * bet Com PM* 13 11 52.3938268062 +27 52 41.462309460 4.92 4.84 4.25 3.77 3.47 F9.5V 870 0
56 V* EK Dra BY* 14 39 00.2104038120 +64 17 29.979649860   8.243 7.604     G1.5V 408 0
57 Haro 1-6 Or* 16 26 03.0276684144 -24 23 36.188140848   14.15 14.01 12.38 10.80 K0 212 2
58 EM* SR 12 Or* 16 27 19.5054789229 -24 41 40.414828505     13.28 12.15 10.855 M0IVe 172 1
59 EM* SR 9 Or* 16 27 40.2857881416 -24 22 04.130226300   12.91 11.533 11.11 10.00 K5e 267 0
60 NAME Ophiuchus Molecular Cloud SFR 16 28 06 -24 32.5           ~ 3335 1
61 EM* SR 13 Or* 16 28 45.2768168328 -24 28 18.905579112     13.60 12.40 10.9 M2e 127 0
62 * 15 Sge PM* 20 04 06.2207683221 +17 04 12.676556401   6.390 5.788 5.4   G0V 360 0

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2022.05.24-07:30:13

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