2004A&A...419..249S


C.D.S. - SIMBAD4 rel 1.7 - 2021.03.01CET09:47:45

2004A&A...419..249S - Astronomy and Astrophysics, volume 419, 249-267 (2004/5-3)

Rotation and accretion of very low mass objects in the σ Ori cluster.

SCHOLZ A. and EISLOEFFEL J.

Abstract (from CDS):

We report on two photometric monitoring campaigns of Very Low Mass (VLM) objects in the young open cluster around σOrionis. Our targets were pre-selected with multi-filter photometry in a field of 0.36sq.deg. For 23 of these objects, spanning a mass range from 0.03 to 0.7M, we detect periodic variability. Of these, 16 exhibit low-level variability, with amplitudes of less than 0.2mag in the I-band, which is mostly well-approximated by a sine wave. These periodicities are probably caused by photospheric spots co-rotating with the objects. In contrast, the remaining variable targets show high-level variability with amplitudes ranging from 0.25 to 1.1mag, consisting of a periodic light variation onto which short-term fluctuations are superimposed. This variability pattern is very similar to the photometric behaviour of solar-mass, classical T Tauri stars. Low-resolution spectra of a few of these objects reveal strong Hα and Ca-triplet emission, indicative of ongoing accretion processes. This suggests that 5-7% of our targets still possess a circumstellar disk. In combination with previous results for younger objects, this translates into a disk lifetime of 3-4Myr, significantly shorter than for solar mass stars. The highly variable objects rotate on average slower than the low-amplitude variables, which is expected in terms of a disk-locking scenario. There is a trend towards faster rotation with decreasing mass, which might be caused by shortening of the disk lifetimes or attenuation of magnetic fields.

Abstract Copyright:

Journal keyword(s): techniques: photometric - stars: low-mass, brown dwarfs - stars: rotation - stars: formation - stars: activity - stars: magnetic fields

VizieR on-line data: <Available at CDS (J/A+A/419/249): table7.dat>

Nomenclature: Table 7: [SE2004] NNN (Nos 1-135).

Simbad objects: 143

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Number of rows : 143

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 Cl Melotte 20 OpC 03 26 42 +48 48.0           ~ 768 0
2 Cl Melotte 22 OpC 03 47 00 +24 07.0           ~ 3061 0
3 NAME Trapezium Cluster As* 05 35 16.5 -05 23 14           ~ 1497 1
4 2MASS J05380167-0225527 Y*O 05 38 01.6745949103 -02 25 52.785231427   18.71 17.21 16.01 14.54 ~ 12 0
5 2MASS J05380513-0157598 * 05 38 05.1291895329 -01 58 00.089038668         18.52 ~ 1 0
6 2MASS J05380582-0157375 * 05 38 05.8029695704 -01 57 37.918240521         18.66 ~ 1 0
7 2MASS J05380897-0220109 Y*O 05 38 08.9765709253 -02 20 10.968399942   19.15 17.66 16.41 14.85 M3.5 11 0
8 2MASS J05381033-0213596 PM* 05 38 10.3529014085 -02 13 59.741099915   18.1 17.73 16.63 14.50 ~ 7 0
9 Mayrit 1095334 Y*? 05 38 12.3978529890 -02 19 38.853119411   21.22   19.97 17.84 ~ 12 0
10 V* V2721 Ori Or* 05 38 12.7942558843 -02 12 26.702125993   21.97 20.28 17.94 16.97 M4.0V 11 0
11 2MASS J05381319-0226088 Y*O 05 38 13.1972684896 -02 26 08.655719751   18.41 16.92 15.67 14.10 M4.5 19 0
12 [BZR99] S Ori 13 Y*O 05 38 13.2092361094 -02 24 07.550933226   21.07 19.68 18.06 16.13 M5.5 14 0
13 [SE2004] 58 * 05 38 14.1533995206 -02 01 57.248916162         17.77 ~ 2 0
14 [BNM2013] 92.04 391 * 05 38 14.3039840675 -02 25 05.591817847       19.09 17.52 ~ 2 0
15 2MASS J05381453-0210152 Y*O 05 38 14.5375265733 -02 10 15.291832301   18.22 16.75 15.50 13.98 ~ 6 1
16 CVSO 1808 TT* 05 38 14.8735317647 -02 00 57.164133354   17.77 16.29 15.23 14.02 ~ 5 0
17 2MASS J05381544-0210430 * 05 38 15.4543951572 -02 10 43.185513268         18.77 ~ 1 0
18 [SE2004] 60 * 05 38 16.5640258664 -02 09 13.276944068         17.87 ~ 3 0
19 V* V2722 Ori Or* 05 38 16.9883710472 -02 14 46.439510351       17.58 16.057 ~ 12 0
20 V* V2723 Ori Or* 05 38 17.1803886299 -02 22 25.719348411   22.96 19.21 17.61 15.67 M5.0 15 0
21 2MASS J05381729-0210519 * 05 38 17.2927182828 -02 10 51.988937385       11.52 11.170 K1 5 0
22 2MASS J05381746-0209236 Y*O 05 38 17.4659216538 -02 09 23.668394553   19.64 18.10 16.70 14.96 ~ 8 0
23 2MASS J05381800-0221103 Y*O 05 38 18.0008180398 -02 21 10.462116195     14.43 13.32 12.53 G4.0 8 0
24 2MASS J05381817-0158427 Y*O 05 38 18.1374596130 -01 58 42.904928377   20.06 18.42 17.15 15.58 ~ 2 0
25 2MASS J05382079-0202576 Y*? 05 38 20.7928951225 -02 02 57.680456004         15.23 ~ 2 0
26 2MASS J05382178-0221494 Y*O 05 38 21.7823038345 -02 21 49.589086475     13.35 12.34 11.62 G2.0 8 0
27 V* V2724 Ori Or* 05 38 23.2412783786 -02 12 48.577685767     14.05 12.97 12.20 ~ 6 0
28 V* V2725 Ori Or* 05 38 23.3367448676 -02 25 34.603396389   19.60 18.40 17.22 15.69 M2.0 16 0
29 V* V2726 Ori Or* 05 38 23.5906623286 -02 20 47.642532104   19.81 18.64 17.14 15.32 M5.5 19 0
30 V* V2727 Ori Or* 05 38 23.7268318702 -02 22 39.660019405   22.31   21.07 19.09 ~ 4 0
31 2MASS J05382503-0213162 Y*O 05 38 25.0313223957 -02 13 16.233505420   18.93 17.44 16.22 14.75 ~ 7 0
32 2MASS J05382549-0210228 Y*O 05 38 25.493448 -02 10 23.05632   17.46 15.76 15.41 13.45 ~ 7 0
33 V* V2730 Ori TT* 05 38 26.5689246713 -02 12 17.475390411   16.50 15.12 14.20 13.31 K6 11 0
34 [SE2004] 64 * 05 38 26.8568223719 -02 05 58.890883798         19.14 ~ 2 0
35 2MASS J05382864-0211157 Y*O 05 38 28.6458944927 -02 11 15.806855438   19.59 17.90 16.62 14.89 ~ 4 0
36 Haro 5-9 Or* 05 38 29.1605315197 -02 16 15.771894396   15.40 14.45 13.20 12.954 K6.5 22 0
37 2MASS J05382954-0158418 * 05 38 29.5418296404 -01 58 41.893336596         17.08 ~ 1 0
38 [BZR99] S Ori 29 Or* 05 38 29.6182347465 -02 25 14.263130080   21.05 20.72 19.02 17.02 M4.0 19 0
39 V* V2733 Ori Or* 05 38 29.9565996061 -02 15 40.641699750   19.27 17.66 16.46 14.97 ~ 7 0
40 2MASS J05383008-0221198 Y*O 05 38 30.0851165892 -02 21 19.952751636     14.80 14.06 12.96 G1.5 8 0
41 2MASS J05383116-0213347 * 05 38 31.1764031022 -02 13 34.776130297         18.96 ~ 1 0
42 [BZR99] S Ori 54 LM* 05 38 33.33648 -02 20 59.4060           M9.5Ve 11 0
43 2MASS J05383360-0157543 Y*O 05 38 33.6053191622 -01 57 54.441518107   18.99 17.49 16.15 14.42 ~ 5 0
44 2MASS J05383378-0220417 * 05 38 33.7804020715 -02 20 41.857110425     14.19 13.20 12.51 ~ 4 0
45 2MASS J05383411-0200376 * 05 38 34.1146602965 -02 00 37.685547127         16.64 ~ 1 0
46 2MASS J05383419-0202020 * 05 38 34.1940007915 -02 02 02.107489401         16.49 ~ 1 0
47 2MASS J05383624-0208241 * 05 38 36.2432118447 -02 08 24.246595200         15.86 ~ 3 0
48 V* V2734 Ori Or* 05 38 37.8793547565 -02 20 39.801494838   21.22   19.95 17.75 ~ 13 0
49 2MASS J05383808-0214392 * 05 38 38.0894146738 -02 14 39.395469394       18.73 16.87 ~ 4 0
50 2MASS J05383888-0228016 Y*O 05 38 38.8911596595 -02 28 01.731339488 20.95 21.83   18.77 16.99 M5Ve 24 0
51 2MASS J05383972-0218376 Y*O 05 38 39.7197627680 -02 18 37.679428017   14.67 13.05 11.85 11.30 K5.5 9 0
52 2MASS J05383990-0206396 Y*O 05 38 39.9055947990 -02 06 39.795976466   18.85 17.27 16.08 14.60 ~ 3 0
53 2MASS J05384020-0203261 * 05 38 40.2121028542 -02 03 26.100771595         17.77 ~ 2 0
54 NAME sigma Orionis Cluster MGr 05 38 42 -02 36.0           ~ 497 0
55 * sig Ori Y*O 05 38 44.7665260139 -02 36 00.284709290 2.54 3.58 3.79 3.87 4.11 O9.5V 753 0
56 2MASS J05384478-0213210 * 05 38 44.7865895849 -02 13 21.064597920     14.70 13.96 12.87 ~ 5 0
57 V* V2736 Ori Or* 05 38 46.6071571086 -02 19 40.090638530   22.01 20.17 18.73 17.02 ~ 7 0
58 [BZR99] S Ori 15 Y*O 05 38 48.0990263161 -02 28 53.680362302 21.11 21.32 19.89 18.32 16.42 M5.5e 17 0
59 V* V2737 Ori Or* 05 38 49.2830965085 -02 23 57.623954857 22.321 23.90 19.39 17.67 16.90 M3.8V 22 0
60 2MASS J05384978-0209413 Y*O 05 38 49.7900629476 -02 09 41.372034152   19.46 17.95 16.72 15.21 ~ 2 0
61 [BNM2013] 92.01 11 LM* 05 38 50.3858746989 -02 26 47.768661105 19.775 18.37 16.79 15.56 14.05 M3.5 14 0
62 2MASS J05385105-0212017 * 05 38 51.0517503042 -02 12 01.706619280   20.33 19.61 18.16 16.61 ~ 2 0
63 2MASS J05385224-0208098 Y*O 05 38 52.2423461256 -02 08 09.902999172   20.78 19.08 17.60 15.68 ~ 5 0
64 2MASS J05385492-0228583 Y*O 05 38 54.9294057342 -02 28 58.375274422 21.05 20.21 18.61 17.22 15.48 M4.5 25 0
65 2MASS J05385746-0215503 * 05 38 57.4682677235 -02 15 50.337202063     15.47 14.69 13.95 ~ 2 0
66 2MASS J05385764-0208271 * 05 38 57.6461984637 -02 08 27.411597794         17.88 ~ 1 0
67 2MASS J05385855-0215278 Y*O 05 38 58.5545914071 -02 15 27.824117061   17.90 16.44 15.30 13.97 ~ 8 0
68 Haro 5-16 Or* 05 39 01.3709989122 -02 18 27.455689721   16.28 15.01 14.02 12.99 M0.5 21 0
69 2MASS J05390215-0214244 * 05 39 02.1609287378 -02 14 24.432501436       17.97 16.24 ~ 1 0
70 [BNM2013] 90.02 565 * 05 39 02.2917501220 -02 23 47.047882705 21.855 22.34   20.10 18.43 ~ 3 0
71 2MASS J05390387-0220081 Y*O 05 39 03.8714479915 -02 20 08.117079515   20.09 18.79 17.38 15.62 M4.5 11 0
72 2MASS J05390442-0205572 * 05 39 04.4318683191 -02 05 57.249425241         14.92 ~ 1 0
73 2MASS J05390445-0210133 * 05 39 04.45 -02 10 13.3         18.44 ~ 1 0
74 2MASS J05390581-0226154 Y*O 05 39 05.8215014812 -02 26 15.499054158   20.12 18.54 17.33 15.83 ~ 6 0
75 V* V2738 Ori Or* 05 39 05.9764088104 -02 07 31.306262623         16.536 ~ 3 0
76 V* V2739 Ori Or* 05 39 07.5698088134 -02 12 14.566181081       19.22 17.16 ~ 9 0
77 [BZR99] S Ori 20 Y*O 05 39 07.5830702951 -02 29 05.657145325   22.49   19.02 17.03 M5.5 16 0
78 [W96] rJ053907-0228 LM* 05 39 07.5918387835 -02 28 23.407342309 19.14 18.52 16.98 15.79 14.36 M3e 19 0
79 2MASS J05390808-0228447 Y*O 05 39 08.086 -02 28 44.77 19.34 19.57 18.69 17.56 15.88 M4.0 16 0
80 [SE2004] 84 * 05 39 08.1374877274 -02 03 51.531475334         18.40 ~ 2 0
81 V* V2741 Ori Or* 05 39 09.0767709366 -02 00 26.995947255         18.84 ~ 4 0
82 2MASS J05390928-0219130 Y*O 05 39 09.2865642226 -02 19 13.008764499   17.65 16.17 15.11 13.94 M1.5 10 0
83 2MASS J05391160-0218461 * 05 39 11.5820865412 -02 18 45.843951937         18.69 ~ 2 0
84 2MASS J05391183-0227409 Y*O 05 39 11.8351243120 -02 27 41.013859151 20.843 19.55 18.04 16.81 15.16 ~ 15 0
85 2MASS J05391203-0214263 * 05 39 12.0435628834 -02 14 26.279209925       18.24 16.594 ~ 4 0
86 2MASS J05391431-0207113 * 05 39 14.3178559528 -02 07 11.426417707         16.91 ~ 1 0
87 [BNM2013] 90.02 109 LM* 05 39 14.4705665655 -02 28 33.424035167 20.561 19.11 17.52 16.30 14.82 M3.5e 17 0
88 2MASS J05391448-0157512 Y*O 05 39 14.4831976842 -01 57 51.190369575         14.05 ~ 3 0
89 V* V956 Ori Or* 05 39 14.5362526229 -02 19 36.691185750   17.33 15.90 14.83 13.60 M1.5 12 0
90 V* V2744 Ori Or* 05 39 15.0554691992 -02 18 44.453315641   19.99 18.51 17.27 15.73 M3.5 8 0
91 [BZR99] S Ori 38 Y*O 05 39 15.2626568055 -02 21 50.705185382   22.96   20.02 17.97 M7 13 0
92 2MASS J05391587-0202051 * 05 39 15.8888506807 -02 02 05.199073072         16.57 ~ 1 0
93 2MASS J05391659-0222242 Y*O 05 39 16.5947009919 -02 22 24.245982457   15.82 14.18 12.91 12.31 G3.5 9 0
94 Kiso A-0904 80 Y*O 05 39 17.176752 -02 25 43.36716 19.748 18.25 16.40 16.02 14.18 M1.5 17 0
95 2MASS J05391860-0206478 * 05 39 18.6077894063 -02 06 47.864752460         15.35 ~ 1 0
96 2MASS J05391903-0221380 Y*O 05 39 19.0327495049 -02 21 38.110203502   14.10 12.93 11.93 11.50 G2.5 7 0
97 2MASS J05392092-0205353 * 05 39 20.9331434276 -02 05 35.443131737         16.56 ~ 1 0
98 2MASS J05392633-0228376 Y*O 05 39 26.3370433757 -02 28 37.705662392   19.69 18.02 16.96 15.26 ~ 15 0
99 2MASS J05392647-0226154 Y*O 05 39 26.4735676700 -02 26 15.516221063   18.55 17.08 15.98 14.81 M1.5 13 0
100 V* V2746 Ori Or* 05 39 26.5962840742 -02 04 20.833442616         18.37 ~ 2 0
101 2MASS J05392661-0202091 * 05 39 26.6216850217 -02 02 09.253346368         17.23 ~ 1 0
102 2MASS J05392773-0228083 * 05 39 27.73 -02 28 08.3         18.48 ~ 1 0
103 2MASS J05392825-0206136 * 05 39 28.2577779272 -02 06 13.577759676         17.02 ~ 1 0
104 2MASS J05392883-0217513 Y*O 05 39 28.8350546610 -02 17 51.360927864   18.39 16.97 15.77 14.27 M3.5 9 0
105 2MASS J05393247-0206376 * 05 39 32.4735059217 -02 06 37.680436097         15.18 ~ 1 0
106 V* V2748 Ori Or* 05 39 32.9285884302 -02 11 31.174498873   18.80 17.56 16.24 14.69 ~ 4 0
107 2MASS J05393364-0203294 * 05 39 33.6415655625 -02 03 29.839388517         18.21 ~ 1 0
108 2MASS J05393611-0206474 * 05 39 36.0970802526 -02 06 47.461488828         17.69 ~ 1 0
109 2MASS J05394097-0216243 TT* 05 39 40.9756212916 -02 16 24.371435583   19.37 18.01 16.54 14.75 ~ 13 0
110 2MASS J05394299-0213333 Y*O 05 39 42.9939614232 -02 13 33.329466145   20.17 18.58 17.25 15.56 ~ 10 0
111 [BZR99] S Ori 10 Y*O 05 39 44.5055882893 -02 24 43.244043838   23.03 19.76   16.36 ~ 16 0
112 V* V2750 Ori Or* 05 39 46.6100618827 -02 26 31.385543268   19.65 18.05 16.65 14.87 M5.0 13 0
113 [SE2004] 108 * 05 39 48.2654548848 -02 29 14.295949989   25.91   20.78 18.68 M7 12 0
114 2MASS J05394944-0223459 Y*O 05 39 49.4438003835 -02 23 45.964313395   20.21 18.15 16.86 15.12 M4e 17 0
115 2MASS J05395118-0222461 Y*O 05 39 51.1840399713 -02 22 46.226933098     15.77 14.93 13.77 G1.0 8 0
116 Haro 5-30 TT* 05 39 51.7265529399 -02 22 47.260581988   19.33 17.95 16.40 14.64 M5.5e 21 0
117 [SE2004] 112 PM* 05 39 52.5720906817 -02 11 32.347635285   20.2   19.3 16.13 ~ 3 0
118 2MASS J05395261-0205335 * 05 39 52.6072750381 -02 05 33.590623902         14.28 ~ 1 0
119 [SE2004] 114 * 05 39 53.064 -02 16 23.07     22.62   19.32 ~ 4 0
120 2MASS J05395393-0202326 * 05 39 53.9293814742 -02 02 32.577688815         17.20 ~ 1 0
121 2MASS J05395421-0227326 Y*O 05 39 54.2048070580 -02 27 32.726308056   19.81 18.25 16.86 15.21 M4.5 18 0
122 2MASS J05395496-0210518 * 05 39 54.9629762238 -02 10 51.856618481         15.34 ~ 2 0
123 2MASS J05395736-0210419 Y*O 05 39 57.37 -02 10 42.0       17.220 15.545 ~ 4 0
124 2MASS J05395825-0226188 Y*O 05 39 58.2508179091 -02 26 18.892854348     16.79 15.75 14.26 M3 12 0
125 2MASS J05395946-0216522 Y*O 05 39 59.4690370189 -02 16 52.338050425     17.73 16.46 14.55 ~ 7 0
126 2MASS J05395963-0210519 * 05 39 59.6393829689 -02 10 52.043363220         15.01 ~ 2 0
127 2MASS J05400101-0219597 Y*O 05 40 01.0149891240 -02 19 59.835364300   18.0 18.47 17.08 14.95 ~ 14 0
128 2MASS J05400168-0211077 * 05 40 01.6877067664 -02 11 07.794719344         14.12 ~ 2 0
129 Haro 5-36 Or* 05 40 01.9557413466 -02 21 32.633848602     16.63 15.46 13.88 M4.5 29 0
130 [SE2004] 125 * 05 40 03.55 -02 06 19.0         17.45 ~ 3 0
131 2MASS J05400403-0211563 * 05 40 04.0395974930 -02 11 56.328415192         14.51 ~ 1 0
132 2MASS J05400401-0221133 * 05 40 04.0428798820 -02 21 13.580647982         18.35 ~ 1 0
133 V* V2753 Ori Or* 05 40 07.2420240724 -02 04 04.425586267       19.326 17.603 ~ 3 0
134 2MASS J05400806-0209012 Y*? 05 40 08.0648720407 -02 09 01.331623610         14.74 ~ 3 0
135 2MASS J05400883-0207400 * 05 40 08.8316195640 -02 07 40.132227495         18.57 ~ 1 0
136 2MASS J05400933-0225067 Y*O 05 40 09.3350885632 -02 25 06.803822414   19.92 18.47 16.68 15.10 ~ 14 0
137 2MASS J05400970-0210335 Y*? 05 40 09.7055259400 -02 10 33.601664126         14.26 ~ 2 0
138 2MASS J05401082-0211264 Y*O 05 40 10.8240138865 -02 11 26.537116255         13.62 ~ 3 0
139 2MASS J05401264-0208589 * 05 40 12.6445165209 -02 08 59.045926213         17.96 ~ 1 0
140 2MASS J05401276-0225151 * 05 40 12.7793782166 -02 25 15.113229229         18.28 ~ 1 0
141 IC 2391 OpC 08 40 32 -53 02.0           ~ 732 0
142 NAME Cha 1 MoC 11 06 48 -77 18.0           ~ 1009 1
143 IC 4665 OpC 17 46 18 +05 43.0           ~ 321 0

    Equat.    Gal    SGal    Ecl

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2021.03.01-09:47:45

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