2008A&A...479..827G


Query : 2008A&A...479..827G

2008A&A...479..827G - Astronomy and Astrophysics, volume 479, 827-843 (2008/3-1)

Results of the ROTOR-program. II. The long-term photometric variability of weak-line T Tauri stars.

GRANKIN K.N., BOUVIER J., HERBST W. and MELNIKOV S.Y.

Abstract (from CDS):

T Tauri stars exhibit variability on all timescales, whose origin is still debated. On WTTS the variability is fairly simple and attributed to long-lived, ubiquitous cool spots. We investigate the long term variability of WTTS, extending up to 20 years in some cases, characterize it statistically and discuss its implications for our understanding of these stars. We have obtained a unique, homogeneous database of photometric measurements for WTTS extending up to 20 years. It contains more than 9000 UBVR observations of 48 WTTS. All the data were collected at Mount Maidanak Observatory (Uzbekistan) and they constitute the longest homogeneous record of accurate WTTS photometry ever assembled. Definitive rotation periods for 35 of the 48 stars are obtained. Phased light curves over 5 to 20 seasons are now available for analysis. Light curve shapes, amplitudes and colour variations are obtained for this sample and various behaviors exhibited, discussed and interpreted. Our main conclusion is that most WTTS have very stable long term variability with relatively small changes of amplitude or mean light level. The long term variability seen reflects modulation in the cold spot distributions. Photometric periods are stable over many years, and the phase of minimum light can be stable as well for several years. On the long term, spot properties do change in subtle ways, leading to secular variations in the shape and amplitudes of the light curves.

Abstract Copyright:

Journal keyword(s): stars: rotation - stars: fundamental parameters - stars: starspots - stars: variables: general - stars: pre-main sequence

VizieR on-line data: <Available at CDS (J/A+A/479/827): stars.dat phot/*>

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 - 2023
#notes
1 V* VY Ari RS* 02 48 43.7287198695 +31 06 54.592461256   7.72   6.4   G9 220 0
2 Cl Melotte 20 OpC 03 26 28 +48 58.5           ~ 826 0
3 V* V1224 Tau Or* 03 29 38.3694765312 +24 30 37.868047092   13.037 12.160   11.111 K1 60 0
4 IC 348 OpC 03 44 32 +32 09.5           ~ 1343 1
5 Cl Melotte 22 OpC 03 46 24 +24 06.8           ~ 3291 0
6 V* V679 Tau TT* 03 52 02.2372961328 +24 39 47.681148816   13.57 11.41 11.89 10.77 K5e 124 0
7 2MASS J03542950+3203013 TT* 03 54 29.5045395048 +32 03 01.408753080   12.71 11.85     G0 49 0
8 2MASS J03543017+3203043 TT* 03 54 30.1717556400 +32 03 04.330870164   13.25 12.31     G5 50 0
9 TAP 11 TT* 03 54 34 +25 36.9     12.31     ~ 6 0
10 2MASS J03543556+2537111 TT* 03 54 35.5601063352 +25 37 11.176921092   14.90 13.79     K3 36 0
11 2MASS J03543597+2537081 TT* 03 54 35.9763003936 +25 37 08.172087816   13.59 12.67     K2 40 0
12 V* V1067 Tau A TT* 04 03 13.9548204864 +25 52 59.084503428           K3e 42 0
13 V* V1067 Tau Or* 04 03 13.959264 +25 52 59.65104   13.83 12.83 12.69   K3e+K3e 42 0
14 V* V1067 Tau B TT* 04 03 13.9629511104 +25 53 00.374937756   13.96 12.91     K3e 28 0
15 HD 281691 TT* 04 09 09.7467974736 +29 01 30.302914008   11.48 10.68 10.24   G8III 47 0
16 V* V1095 Tau TT* 04 13 14.1551534304 +28 19 10.668859500   15.32 13.81 13.62   M4 105 0
17 V* V1096 Tau TT* 04 13 27.2218223808 +28 16 24.656012868   15.42 13.53 13.07   M0 79 0
18 V* V1097 Tau BY* 04 14 30.6248237544 +28 51 29.716002072   12.0 11.15 11.26   M0 18 0
19 V* V1098 Tau Or* 04 14 47.9897419517 +27 52 34.232647358   14.08 11.73 10.95   M1 113 0
20 HD 284266 TT* 04 15 22.9214409240 +20 44 16.917956484   11.20 10.51 10.12   K0V: 41 0
21 EM* LkCa 4 Or* 04 16 28.1067298272 +28 07 35.731363080   13.96 12.78 11.825   K7:Ve 171 0
22 V* V1312 Tau TT* 04 17 38.9450182296 +28 33 00.578450700   15.57 13.26 13.12   M2 97 0
23 V* V410 Tau Or* 04 18 31.1081296680 +28 27 16.155955728   12.13 10.75 8.45 9.408 K3Ve 449 0
24 V* V1023 Tau Or* 04 18 47.0291197872 +28 20 07.493080560   14.31 12.00 11.21   K7 155 0
25 V* V1069 Tau Or* 04 18 51.7036254480 +17 23 16.582694856   13.32 12.22 12.22 10.944 K7e 120 0
26 WK81 1 TT* 04 19 26.2675117776 +28 26 14.259575472   14.81 13.04 12.240   K7 211 1
27 V* V1070 Tau Or* 04 19 41.2688488305 +27 49 48.151086734   13.75 12.25 11.14   M0 144 0
28 HD 283572 Or* 04 21 58.8484815456 +28 18 06.512641416   9.80 9.03 9.14   G5IVe 278 0
29 EM* LkCa 21 Or* 04 22 03.1470550272 +28 25 39.096067656   10.94       M3/4Ve 85 0
30 HD 285751 TT* 04 23 41.3220021720 +15 37 54.899671728   12.42 11.56     K2V: 43 0
31 HD 285778 Or* 04 27 10.5694045464 +17 50 42.660831084   11.07 10.22     K1e 127 0
32 V* V1103 Tau BY* 04 29 01.0133482776 +18 40 25.322063340   14.74 13.310 12.982   M2.5V 42 0
33 NAME Tau-Aur Complex SFR 04 30 +25.0           ~ 1325 0
34 HD 284496 TT* 04 31 16.8584671848 +21 50 25.246186044   11.59 10.795 10.36 9.837 G0 35 0
35 HBC 392 Or* 04 31 27.1761425664 +17 06 24.744279276   13.71       K5e 70 0
36 L 1551-51 Or* 04 32 09.2839413744 +17 57 22.693472640   13.29       K7e 126 0
37 V* V827 Tau TT* 04 32 14.5700738928 +18 20 14.771601168   14.00 12.63 12.35   K7Ve 167 0
38 V* V826 Tau TT* 04 32 15.8393134800 +18 01 38.750623752   13.51 12.074   10.312 K7.0 171 0
39 V* V1076 Tau Or* 04 32 43.7362452744 +18 02 56.310071784   14.72       K7 91 0
40 V* V830 Tau TT* 04 33 10.0300557048 +24 33 43.255480860   13.91 12.08 11.30   M0-1 202 1
41 V* V1077 Tau Or* 04 34 18.0303957624 +18 30 06.519662280   13.70       G8 77 0
42 V* V1110 Tau RS* 04 34 39.2797655376 +25 01 01.016239440   11.14 10.308   9.141 G0 56 0
43 V* V1115 Tau TT* 04 36 19.1015447256 +25 42 59.001786828   12.97 11.76 10.81 10.228 M0 88 0
44 V* VY Tau Or* 04 39 17.4194063616 +22 47 53.348542332     9.00     M0Ve 190 0
45 V* IW Tau Or* 04 41 04.7179844751 +24 51 06.034940625   14.25 12.595 11.65 10.504 K7Ve 118 0
46 HD 282630 Or* 04 55 36.9695564640 +30 17 55.101300900   12.17 11.12 10.55   K0Ve 161 0
47 V* V397 Aur Or* 04 56 02.0265224208 +30 21 03.670989228   13.07 11.72 11.25   K7e 163 0
48 HD 282600 LP* 04 57 06.5174531640 +31 42 50.590964592   12.16 10.88 10.05   K0 25 0
49 V* V1207 Tau TT* 04 58 39.7400575008 +20 46 44.000970276   13.15       K7 31 0
50 V* V836 Tau TT* 05 03 06.5988375912 +25 23 19.606639488   15.00 13.49 13.48   K7/M0Ve 223 0
51 NAME Orion Nebula Cluster OpC 05 35.0 -05 29           ~ 2225 1
52 NGC 2264 OpC 06 40 52 +09 52.6           ~ 1736 0
53 IC 2602 OpC 10 42 27 -64 25.6           ~ 642 0
54 Wa Oph 1 Or* 16 11 08.9057560608 -19 04 46.976720052     12.073   10.194 K2IV(e) 64 0
55 Wa Oph 2 Or* 16 11 59.2702332696 -19 06 53.316517068     11.66 11.57   K2Ve 64 0
56 BD-18 4244 Or* 16 12 40.5144406080 -18 59 28.267620432   12.15 10.829   9.235 K0IV(e) 88 0
57 EM* SR 12 Or* 16 27 19.5054789229 -24 41 40.414828505     13.28 12.15 10.855 M0IVe 176 1
58 EM* SR 9 Or* 16 27 40.2857881416 -24 22 04.130226300   12.91 11.533 11.11 10.00 K5e 277 0
59 Wa Oph 4 Or* 16 48 18.0034524096 -14 11 15.801239760   15.40 13.46     K5Ve 30 0
60 NAME Oph Cluster ClG 17 12 24.7 -23 21 01           ~ 262 0
61 V* V709 CrA Or* 19 01 34.8589591776 -37 00 56.579123412   12.70 11.03     K1IV 62 0
62 V* V702 CrA Or* 19 02 01.9776932592 -37 07 43.519646568   11.28 10.512   9.512 G5e 42 0

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2023.03.22-21:08:59

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