2000A&A...361..581S


C.D.S. - SIMBAD4 rel 1.7 - 2020.10.21CEST07:36:59

2000A&A...361..581S - Astronomy and Astrophysics, volume 361, 581-593 (2000/9-2)

X-ray emission from young stars in the Tucanae association.

STELZER B. and NEUHAEUSER R.

Abstract (from CDS):

We report on X-ray emission from members of the recently discovered Tucanae association, a group of stars with youth signatures and similar space motion. The Tucanae association is the nearest known region of recent star formation (∼45pc) far from molecular clouds (Zuckerman, 2000). We have made use of the ROSAT Data Archive and searched for X-rays from Tucanae stars in both ROSAT All-Sky Survey (RASS) and pointed observations. While the RASS provides complete coverage of the sky, only three potential Tucanae members have been observed during PSPC pointings. All three stars have been detected. For the RASS the percentage of detections is 59%. The comparison of the X-ray luminosity function of Tucanae to that of other star forming regions may provide clues to the uncertain age of the association. We find that the distribution of X-ray luminosities is very similar to the ones derived for the TW Hya association, the Taurus-Auriga T Tauri Stars, and the IC 2602 cluster, but significantly brighter than the luminosity distribution of the Pleiades. We conclude that the stars in Tucanae are most likely young, on the order of 10-30Myr. Strong variability of most stars emerges from the X-ray lightcurves where several flares and irregular variations are observed.

Abstract Copyright:

Journal keyword(s): X-rays: stars - stars: formation

Errata: Erratum vol. 372, p. 117 (2001)

Simbad objects: 61

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Number of rows : 61

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 NAME Tuc Moving Group MGr 00 00 -64.0           ~ 67 0
2 HD 67 PM* 00 05 28.4522364748 -61 13 33.074652717   9.47 8.80     G5V 33 1
3 CD-60 31 PM* 00 17 30.4963031798 -59 57 04.369286083   12.90 11.26     M1V 14 0
4 HD 1466 PM* 00 18 26.1235227218 -63 28 38.981281995   8.00 7.46     F8V 93 0
5 Smethells 165 ** 00 24 08.9765451863 -62 11 04.393080373   12.71 11.335 11.076 9.49 M0Ve 49 0
6 V* CT Tuc Ro* 00 25 14.6620449902 -61 30 48.252609565   13.11 11.34   9.66 M0Ve 50 0
7 * bet01 Tuc ** 00 31 32.6680740 -62 57 29.587487   4.249 4.289     B9.5Va 105 0
8 * bet02 Tuc ** 00 31 33.4223046159 -62 57 56.133914894   4.649 4.514     A3IV 92 0
9 * bet03 Tuc ** 00 32 43.9055907013 -63 01 53.397968811 5.15 5.13 5.09     A0V 113 0
10 HD 3221 Ro* 00 34 51.2019905484 -61 54 58.129778039   10.83 9.604   8.238 K4Ve 68 0
11 Cl Melotte 22 OpC 03 47 00 +24 07.0           ~ 3022 0
12 Cl Melotte 25 OpC 04 26 54.00 +15 52 00.0           ~ 2693 0
13 NAME Tau-Aur Complex SFR 04 30 +25.0           ~ 1226 0
14 V* BX Ant TT* 10 18 28.6989165716 -31 50 02.826261802   13.39 11.454 11.382 9.325 M0Ve 103 0
15 V* CE Ant TT* 10 42 30.1021269333 -33 40 16.226774953   12.21 10.91   9.10 M2Ve 152 1
16 IC 2602 OpC 10 42 58 -64 24.0           ~ 557 0
17 V* TW Hya TT* 11 01 51.9054298616 -34 42 17.031550898   11.94 10.50 10.626 9.18 K6Ve 1553 1
18 NAME TW Hya Association As* 11 01.9 -34 42           ~ 825 0
19 CD-29 8887 TT* 11 09 13.8074415397 -30 01 40.070212113   12.95 11.119 10.642 8.875 M2Ve 111 0
20 CD-38 6968 PM* 11 09 40.0907909831 -39 06 47.280172529   10.52 9.93     G3 8 0
21 TWA 3 ** 11 10 27.894072 -37 31 51.96612   13.53 12.05 11.61 9.29 M4Ve+M4Ve 200 0
22 TWA 3A TT* 11 10 27.9117558304 -37 31 51.529219753   14.04 12.57   9.10 M4Ve 187 0
23 V* V1217 Cen BY* 11 21 05.4812165874 -38 45 16.521880972   14.04 12.58 12.34 10.515 M1Ve 64 0
24 CD-34 7390A TT* 11 21 17.2193442623 -34 46 45.500772910   12.88 11.46 11.43 9.57 M1Ve 83 0
25 CD-34 7390 ** 11 21 17.24 -34 46 45.5     11.080   9.038 M1Ve+M1Ve 56 0
26 HD 98800 RS* 11 22 05.28975 -24 46 39.7571   10.20 9.28 9.26 7.386 K5V(e) 333 0
27 CD-33 7795 TT* 11 31 55.2603055856 -34 36 27.214242128   12.97 11.524 11.150 9.150 M2Ve 176 0
28 CD-26 8623 TT* 11 32 41.2659398509 -26 51 55.961617611   13.69 12.23 11.14 9.637 M3Ve 87 0
29 CD-36 7429A TT* 11 48 24.2226856081 -37 28 49.112368947   12.54 11.17 10.92 9.552 K5V 107 0
30 CD-36 7429 ** 11 48 24.22320 -37 28 49.1537           ~ 92 0
31 V* V1252 Cen TT* 12 35 04.2562814903 -41 36 38.620524379   14.39 13.045   10.506 M2Ve 69 0
32 HD 109573B PM* 12 36 00.5493890939 -39 52 15.696207303         10.78 M2.5 74 0
33 HD 109573 PM* 12 36 01.0317721349 -39 52 10.222698506   5.786 5.774 7.25 5.81 A0V 559 1
34 V* PZ Tel BY* 18 53 05.8733807460 -50 10 49.901380086   9.22 8.342   7.464 G9IV 289 0
35 HD 175531 PM* 18 57 56.67180 -44 58 06.7537   10.59 9.79     G8/K0(V) 10 1
36 * rho Tel PM* 19 06 19.9556991283 -52 20 27.288013018   5.700 5.174     F6V 68 0
37 HD 177720 PM* 19 08 51.1248939756 -54 02 17.491901388   9.29 8.75     G0V 11 0
38 HD 180134 PM* 19 18 09.7809297830 -53 23 13.516028208   6.844 6.362     F7V 49 0
39 Smethells 36 PM* 19 19 49.6759452060 -53 43 13.752687078   13.35 12.07 9.8 8.58 M2V 22 0
40 * eta Tel PM* 19 22 51.2064652963 -54 25 26.152538950   5.035 5.020   4.99 A0V+M7/8V 189 0
41 HD 181327 PM* 19 22 58.9434412361 -54 32 16.979671096   7.50 7.04   6.49 F6V 232 0
42 HD 181516 PM* 19 23 20.5672444637 -50 41 20.375884642   9.80 9.01     G6IV 9 0
43 HD 187101 PM* 19 51 23.6559155423 -58 30 35.538260055   8.59 8.02     F8/G0V 29 0
44 HD 191869 ** 20 14 56.17168 -56 58 35.3230   7.6 7.4     F6/8+F 26 1
45 * alf Pav SB* 20 25 38.85705 -56 44 06.3230 1.03 1.791 1.918     B2IV 273 0
46 HD 195818 PM* 20 36 02.3607635719 -54 56 29.053210518   9.15 8.60     G0V 21 0
47 Smethells 59 PM* 20 38 19.4347488156 -55 36 19.737228949 14.1 12.78 13.325 10.969 9.601 M0V 17 0
48 HD 199065 ** 20 57 22.4358526 -59 04 33.474323           G2/5V+G: 29 0
49 HD 200676 ** 21 07 17.5072840857 -57 01 56.340949977   9.68 8.84     K1V 25 0
50 HD 200798 PM* 21 07 51.2212714094 -54 12 59.461109026   6.93 6.70     A5/6IV/V 31 0
51 HD 202917 Ro* 21 20 49.9575453387 -53 02 03.157635940   9.32 8.67   7.882 G7V 140 0
52 V* BS Ind bL* 21 20 59.8211404023 -52 28 40.186986149   10.70 8.900   7.893 G9V 64 0
53 Smethells 86 Ro* 21 44 30.1228006899 -60 58 38.894974923 14.163 13.00 11.628 10.715 9.815 M0Ve 51 0
54 HD 207377 ** 21 50 23.7919515146 -58 18 18.193979763   8.62 7.89     G6V 29 0
55 HD 207575 PM* 21 52 09.7248951966 -62 03 08.508117999   7.72 7.23     F6V 63 0
56 HD 207964 ** 21 55 11.39417 -61 53 11.7947   6.37 5.96     F0(V)+F5(V) 78 1
57 HD 210507 PM* 22 12 16.9429513839 -54 58 40.692215806   10.62 9.62     K3V 23 0
58 HD 218340 PM* 23 08 12.3706372806 -63 37 41.373527548   9.07 8.44     G3V 32 0
59 CD-64 1417 WU* 23 15 01.1351885616 -63 34 24.569590293   10.73 9.633   8.669 K0IV 17 0
60 HD 222259 RS* 23 39 39.48044 -69 11 44.7051   9.19 8.226   7.352 G6V+K3Ve 78 0
61 * eta Tuc ** 23 57 35.0785168096 -64 17 53.622899148   5.046 4.989     A1V 80 0

    Equat.    Gal    SGal    Ecl

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2020.10.21-07:36:59

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