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


C.D.S. - SIMBAD4 rel 1.7 - 2021.04.10CEST13:27:36

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 - 2021
#notes
1 V* VY Ari RS* 02 48 43.7283572894 +31 06 54.592580835   7.72   6.4   G9 211 0
2 Cl Melotte 20 OpC 03 26 42 +48 48.0           ~ 771 0
3 V* V1224 Tau Or* 03 29 38.3693557066 +24 30 37.867407755   13.037 12.160   11.111 K1 58 0
4 IC 348 OpC 03 44 34 +32 09.8           ~ 1252 1
5 Cl Melotte 22 OpC 03 47 00 +24 07.0           ~ 3073 0
6 V* V679 Tau TT* 03 52 02.2217462456 +24 39 47.690003665   13.57 11.41 11.89 10.77 K5e 117 0
7 2MASS J03542950+3203013 TT* 03 54 29.5045697196 +32 03 01.407089906   12.71 11.85     G0 49 0
8 2MASS J03543017+3203043 TT* 03 54 30.17472 +32 03 04.3488   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 35.5599485201 +25 37 11.176094579   14.90 13.79     K3 34 0
11 2MASS J03543597+2537081 TT* 03 54 35.9683327179 +25 37 08.087063799   13.59 12.67     K2 40 0
12 V* V1067 Tau A TT* 04 03 13.9544410795 +25 52 59.084182120           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 13.9630520870 +25 53 00.374400100   13.96 12.91     K3e 28 0
15 HD 281691 TT* 04 09 09.7467623485 +29 01 30.301321238   11.48 10.68 10.24   G8III 44 0
16 V* V1095 Tau TT* 04 13 14.1550545701 +28 19 10.670834057   15.32 13.81 13.62   M4 99 0
17 V* V1096 Tau TT* 04 13 27.2226142854 +28 16 24.653683705   15.42 13.53 13.07   M0 73 0
18 V* V1097 Tau BY* 04 14 30.6247199830 +28 51 29.717587348   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 108 0
20 HD 284266 TT* 04 15 22.9212726979 +20 44 16.916958963   11.20 10.51 10.12   K0V: 40 0
21 EM* LkCa 4 Or* 04 16 28.1070192558 +28 07 35.732032828   13.96 12.78 11.825   K7:Ve 154 0
22 V* V1312 Tau TT* 04 17 38.9462203679 +28 33 00.570855332   15.57 13.26 13.12   M2 91 0
23 V* V410 Tau Or* 04 18 31.1083261392 +28 27 16.155411536   12.13 10.75 8.45 9.408 K3Ve 436 0
24 V* V1023 Tau Or* 04 18 47.0296109602 +28 20 07.490327496   14.31 12.00 11.21   K7 147 0
25 V* V1069 Tau Or* 04 18 51.7034617249 +17 23 16.579842927   13.32 12.22 12.22 10.944 K7e 107 0
26 WK81 1 TT* 04 19 26.2671630797 +28 26 14.259129092   14.81 13.04 12.240   K7 198 1
27 V* V1070 Tau Or* 04 19 41.2688488305 +27 49 48.151086734   13.75 12.25 11.14   M0 136 0
28 HD 283572 Or* 04 21 58.8482823933 +28 18 06.511915195   9.80 9.03 9.14   G5IVe 272 0
29 EM* LkCa 21 Or* 04 22 03.1462377202 +28 25 39.099044680   10.94       M3/4Ve 79 0
30 HD 285751 TT* 04 23 41.3219281196 +15 37 54.899767190   12.42 11.56     K2V: 42 0
31 HD 285778 Or* 04 27 10.5694001840 +17 50 42.660851333   11.07 10.22     K1e 125 0
32 V* V1103 Tau BY* 04 29 01.0130224156 +18 40 25.320944701   14.74 13.310 12.982   M2.5V 34 0
33 NAME Tau-Aur Complex SFR 04 30 +25.0           ~ 1251 0
34 HD 284496 TT* 04 31 16.8585525460 +21 50 25.247708349   11.59 10.795 10.36 9.837 G0 34 0
35 HBC 392 Or* 04 31 27.1756563044 +17 06 24.745482804   13.71       K5e 70 0
36 L 1551-51 Or* 04 32 09.2838548075 +17 57 22.695083303   13.29       K7e 120 0
37 V* V827 Tau TT* 04 32 14.5731257511 +18 20 14.719337994   14.00 12.63 12.35   K7Ve 159 0
38 V* V826 Tau TT* 04 32 15.8394065935 +18 01 38.751126168   13.51 12.074   10.312 K7.0 167 0
39 V* V1076 Tau Or* 04 32 43.7360056323 +18 02 56.310753348   14.72       K7 86 0
40 V* V830 Tau TT* 04 33 10.0299730541 +24 33 43.255853678   13.91 12.08 11.30   M0-1 179 1
41 V* V1077 Tau Or* 04 34 18.0134345949 +18 30 06.335688396   13.70       G8 75 0
42 V* V1110 Tau RS* 04 34 39.2794263037 +25 01 01.019264184   11.14 10.308   9.141 G0 56 0
43 V* V1115 Tau TT* 04 36 19.1014976181 +25 42 58.999936422   12.97 11.76 10.81 10.228 M0 80 0
44 V* VY Tau Or* 04 39 17.4208176970 +22 47 53.361809753     9.00     M0Ve 183 0
45 V* IW Tau Or* 04 41 04.7179844751 +24 51 06.034940625   14.25 12.595 11.65 10.504 K7Ve 109 0
46 HD 282630 Or* 04 55 36.9698052301 +30 17 55.100440086   12.17 11.12 10.55   K0Ve 154 0
47 V* V397 Aur Or* 04 56 02.0261376554 +30 21 03.635056925   13.07 11.72 11.25   K7e 155 0
48 HD 282600 TT* 04 57 06.5178070912 +31 42 50.591021890   12.16 10.88 10.05   K0 25 0
49 V* V1207 Tau TT* 04 58 39.7399546095 +20 46 44.000674846   13.15       K7 31 0
50 V* V836 Tau TT* 05 03 06.5988350466 +25 23 19.604482133   15.00 13.49 13.48   K7/M0Ve 213 0
51 NAME Orion Nebula Cluster OpC 05 35.0 -05 29           ~ 2050 1
52 NGC 2264 OpC 06 40 58 +09 53.7           ~ 1622 0
53 IC 2602 OpC 10 42 58 -64 24.0           ~ 573 0
54 Wa Oph 1 Or* 16 11 08.9066752575 -19 04 46.972012700     12.073   10.194 K2IV(e) 62 0
55 Wa Oph 2 Or* 16 11 59.2701883216 -19 06 53.315967884     11.66 11.57   K2Ve 62 0
56 BD-18 4244 Or* 16 12 40.5142870003 -18 59 28.267064720   12.15 10.829   9.235 K0IV(e) 86 0
57 EM* SR 12 Or* 16 27 19.5054789229 -24 41 40.414828505     13.28 12.15 10.855 M0IVe 168 1
58 EM* SR 9 Or* 16 27 40.2858402419 -24 22 04.132012501   12.91 11.533 11.11 10.00 K5e 259 0
59 Wa Oph 4 Or* 16 48 18.0036179356 -14 11 15.795986860   15.40 13.46     K5Ve 30 0
60 NAME Oph Cluster ClG 17 12 24.7 -23 21 01           ~ 247 0
61 V* V709 CrA Or* 19 01 34.8590599569 -37 00 56.581106047   12.70 11.03     K1IV 59 0
62 V* V702 CrA Or* 19 02 01.9776706221 -37 07 43.521814188   11.28 10.512   9.512 G5e 41 0

    Equat.    Gal    SGal    Ecl

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2021.04.10-13:27:36

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