1998A&A...330..521W

Query : 1998A&A...330..521W

1998A&A...330..521W - Astronomy and Astrophysics, volume 330521-532 (1998/2-2)

Rotational evolution of pre-main sequence stars in Lupus.

WICHMANN R., BOUVIER J., ALLAIN S. and KRAUTTER J.

Abstract (from CDS):

We present results of a study of the rotational periods of Post-T Tauri stars (PTTSs) in the Lupus star forming region. These stars have been discovered by spectroscopic follow-up observations of ROSAT x-ray sources. Photometric observations have allowed to determine their luminosity, and by comparison with theoretical evolutionary tracks they were found to be significantly older on average than typical T Tauri stars. 46 stars have been monitored photometrically, and for 34 of them photometric variations were found that are consistent with rotational brightness modulations caused by starspots. The large number of data on rotational periods of pre-main-sequence (PMS)/zero-age main-sequence (ZAMS) stars available by now allows us to study the impact of stellar mass on the evolution of angular momentum. For several different mass bins, we compare the available data on rotational periods with theoretical models, and find good agreement between theory and observations for the mass-dependency of the pre-main-sequence evolution of angular momentum. We also study the relation between activity, rotation, mass, and age of low mass stars, and demonstrate that activity is driven by rotation mainly, while it seems to be rather independent of mass and age.

Abstract Copyright: ∼

Journal keyword(s): stars: rotation - stars: pre-main sequence - stars: activity - binaries: eclipsing

CDS comments: Table 1: K NNN = [KWS97] TTS NNN. In table 1, there is a misprint : the star number 106 is number 126.

Simbad objects: 35

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Number of rows : 35
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 V* LO Lup TT* 15 07 37.7410383240 -46 03 15.629428080 13.21 13.03 11.81 11.07 10.52 K2 21 0
2 V* LP Lup TT* 15 07 54.4967018976 -45 15 21.228736104   11.50 10.82     G3 14 0
3 V* LQ Lup TT* 15 08 37.7353724976 -44 23 17.049423444 11.46 11.54 10.645 10.22 9.804 G8IVe 97 0
4 V* LR Lup TT* 15 13 57.2418005064 -46 29 06.086285988       13.72   M2 13 0
5 V* LT Lup TT* 15 15 45.3719328096 -33 31 59.725104132 12.00 11.61 10.670 10.17 9.574 K0e 45 0
6 V* LS Lup TT* 15 15 52.7358985272 -44 18 17.322746652 14.64 13.79 12.49 12.15 11.215 K1 26 0
7 V* LU Lup TT* 15 17 48.7409053848 -37 06 55.614721752   15.6 13.91     K7-M0 8 0
8 V* LV Lup TT* 15 17 49.1404766856 -37 06 54.846828180   16.2 14.82     M1.5 8 0
9 V* LW Lup TT* 15 18 26.9192118480 -37 38 02.070123108 12.23 11.79 10.891 10.41 9.850 K0IVe 41 0
10 V* LX Lup TT* 15 18 52.8186606144 -40 50 52.762169616 12.40 11.92 11.01 10.48 9.97 G8 25 0
11 V* LY Lup TT* 15 19 16.0028202264 -40 56 07.575850608   12.23 11.404   10.187 K0e 31 0
12 V* LZ Lup TT* 15 22 11.6170509720 -39 59 50.984522592 13.86 13.10 12.05 11.79 10.787 K3 22 0
13 V* MM Lup TT* 15 23 25.5768349080 -40 55 46.773915996 13.60 13.11 12.07 11.62 10.71 K2 22 0
14 V* MN Lup TT* 15 23 30.3994838448 -38 21 28.841024628     14.15     M0 27 0
15 V* MO Lup TT* 15 24 03.0436300056 -32 09 50.886751824 14.69 13.60 12.35 12.13 10.614 K4+M4 20 0
16 V* MP Lup TT* 15 24 32.3572754448 -36 52 02.770376232 12.69 11.96 11.231 10.78 10.184 K0V(e) 31 0
17 V* MQ Lup TT* 15 25 33.1689637848 -36 13 46.761718260 13.17 12.71 11.68 11.56 10.468 K2 20 0
18 V* MR Lup TT* 15 25 36.6668495304 -35 37 31.934567280 14.61 13.68 12.492 11.64 10.817 K6 19 0
19 V* MS Lup TT* 15 25 59.6471855904 -45 01 15.821666004 11.97 11.67 10.969 10.42 10.041 G7IV 43 0
20 V* MT Lup TT* 15 38 02.6519492760 -38 07 23.078501688     12.32 12.10 11.013 K5 24 0
21 V* MU Lup TT* 15 40 41.1704779152 -37 56 18.539934828     12.35     K6 31 0
22 V* MV Lup TT* 15 49 59.2107255432 -36 29 57.438440124 11.98 12.59 11.28 10.02 9.52 K2 31 0
23 V* MW Lup TT* 15 52 19.5216794160 -38 19 31.379604564 15.80 14.46 13.19 12.43 11.55 K7 21 0
24 V* MX Lup TT* 15 55 33.7961993688 -37 09 41.057963532 14.77 13.75 12.52 11.77 11.04 K6 24 0
25 V* MZ Lup TT* 16 01 08.9697543744 -33 20 14.177235192 12.11 11.88 10.88 10.35 9.812 G5IVe 34 0
26 V* NN Lup TT* 16 01 59.1820440840 -36 12 55.584740952 13.75 12.99 13.10 11.29 10.381 K3 30 0
27 NAME Lupus Complex SFR 16 03 -38.1           ~ 851 0
28 V* NO Lup TT* 16 03 11.8111062336 -32 39 20.284463916 15.13 14.25 12.864 12.14 11.149 K7 35 0
29 V* NP Lup TT* 16 05 33.2943805416 -38 37 45.214988592     14.38     M1 15 0
30 V* NQ Lup TT* 16 08 18.1987920557 -38 44 05.706934083 14.54 13.518 12.243 11.930 10.60 ~ 18 0
31 V* V1093 Sco TT* 16 08 27.7818643128 -39 00 40.623399936     14.57 13.54 12.20 ~ 21 0
32 V* V1095 Sco TT* 16 09 39.5245401360 -38 55 07.090892580   12.94 11.524 10.77 9.924 ~ 24 0
33 V* V1096 Sco TT* 16 10 04.7938071672 -40 16 12.286370424 12.76 12.10 11.284 10.64 10.098 K2e 23 0
34 V* V1097 Sco TT* 16 13 02.4148850592 -40 04 32.961135720 16.48 15.10 13.49 12.51 11.39 K7 17 0
35 HD 147402 TT* 16 23 29.5554512712 -39 58 00.847339680 11.63 11.42 10.64 10.40 10.03 G3IV 25 0

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