2005A&A...429.1007S


C.D.S. - SIMBAD4 rel 1.7 - 2021.01.24CET02:05:03

2005A&A...429.1007S - Astronomy and Astrophysics, volume 429, 1007-1023 (2005/1-3)

Rotation and variability of very low mass stars and brown dwarfs near ε Ori.

SCHOLZ A. and EISLOEFFEL J.

Abstract (from CDS):

We explore the rotation and activity of very low mass (VLM) objects by means of a photometric variability study. Our targets in the vicinity of ε Ori belong to the Ori OB1b population in the Orion star-forming complex. In this region we selected 143 VLM stars and brown dwarfs (BDs), whose photometry in RIJHK is consistent with membership of the young population. The variability of these objects was investigated using a densely sampled I-band time series covering four consecutive nights with altogether 129 data points per object. Our targets show three types of variability: Thirty objects, including nine BDs, show significant photometric periods, ranging from 4h up to 100h, which we interpret as the rotation periods. Five objects, including two BDs, exhibit variability with high amplitudes up to 1mag which is at least partly irregular. This behaviour is most likely caused by ongoing accretion and confirms that VLM objects undergo a T Tauri phase similar to solar-mass stars. Finally, one VLM star shows a strong flare event of 0.3mag amplitude. The rotation periods show dependence on mass, i.e. the average period decreases with decreasing object mass, consistent with previously found mass-period relationships in younger and older clusters. The period distribution of BDs extends down to the breakup period, where centrifugal and gravitational forces are balanced. Combining our BD periods with literature data, we found that the lower period limit for substellar objects lies between 2h and 4h, more or less independent of age. Contrary to stars, these fast rotating BDs seem to evolve at constant rotation period from ages of 3Myr to 1Gyr, in spite of the contraction process. Thus, they should experience strong rotational braking.

Abstract Copyright:

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

VizieR on-line data: <Available at CDS (J/A+A/429/1007): table2.dat>

Nomenclature: NAME EPS ORI CLUSTER. Table 2: [SE2005] NNN (Nos 1-143).

Simbad objects: 151

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Number of rows : 151

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 22 OpC 03 47 00 +24 07.0           ~ 3048 0
2 [SE2005] 1 LM* 05 33 43.2284000457 -00 38 57.771507665       16.69 14.64 ~ 2 0
3 [SE2005] 2 LM* 05 33 44.7407072313 -00 43 40.369541443       17.57 15.90 ~ 2 0
4 [SE2005] 3 LM* 05 33 46.3173691104 -01 01 55.963184730       19.40 17.47 ~ 1 0
5 V* V1899 Ori Or* 05 33 48.1890421998 -00 55 28.264104380       17.35 15.58 ~ 3 0
6 [SE2005] 5 LM* 05 33 48.4826164594 -01 03 14.037330853       17.56 15.71 ~ 2 0
7 [SE2005] 6 LM* 05 33 48.5338856005 -01 02 15.398654484       20.10 17.72 ~ 1 0
8 [SE2005] 7 LM* 05 33 48.8445132350 -00 54 25.825140199       19.41 16.90 ~ 1 0
9 CVSO 124 TT* 05 33 49.0447530604 -00 46 25.923332524     15.71 14.87 13.34 M3 7 0
10 [SE2005] 8 LM* 05 33 49.0520037938 -00 55 20.200935036       14.74 13.58 ~ 3 0
11 [SE2005] 10 LM* 05 33 50.2017313708 -00 42 39.599759501       17.11 15.05 ~ 2 0
12 [SE2005] 11 LM* 05 33 52.2272162245 -00 48 01.279952217       19.17 17.12 ~ 1 0
13 [SE2005] 12 LM* 05 33 52.8803972192 -00 53 10.855582705       18.01 16.14 ~ 1 0
14 [SE2005] 13 LM* 05 33 53.3521361393 -01 02 12.825236640       18.12 16.14 ~ 1 0
15 [SE2005] 14 LM* 05 33 53.5598761028 -00 38 55.065852073       20.25 17.98 ~ 1 0
16 [SE2005] 15 LM* 05 33 54.4205886403 -00 53 29.326117956       16.82 15.06 ~ 3 0
17 [SE2005] 16 LM* 05 33 54.8776152444 -00 52 29.742352609       16.61 14.92 ~ 2 0
18 V* V1910 Ori Or* 05 33 55.0174134839 -00 56 43.702531626       19.59 17.42 ~ 3 0
19 2MASS J05335683-0058184 LM* 05 33 56.8399354939 -00 58 18.377673718       17.27 15.48 ~ 2 0
20 [SE2005] 19 LM* 05 33 59.4381283683 -00 54 16.578102066       20.88 18.46 ~ 1 0
21 Ass Ori OB 1b As* 05 34.0 -01 30           ~ 240 0
22 V* V1915 Ori Or* 05 34 00.7820695343 -00 57 57.102076687       18.59 16.69 ~ 3 0
23 [SE2005] 21 LM* 05 34 02.2665194684 -00 59 16.825469158       21.16 18.88 ~ 1 0
24 2MASS J05340241-0048230 LM* 05 34 02.4113979373 -00 48 22.927331692       19.73 17.37 ~ 1 0
25 [SE2005] 23 LM* 05 34 03.5008450300 -00 48 12.102751346       21.05 18.73 ~ 1 0
26 V* V1921 Ori Or* 05 34 05.6929044317 -00 57 03.579836357       16.84 15.21 ~ 3 0
27 [SE2005] 25 LM* 05 34 06.8963616300 -00 46 34.174951384       18.92 16.92 ~ 1 0
28 V* V1927 Ori Or* 05 34 07.4095911104 -00 33 10.856721313       16.61 14.88 ~ 3 0
29 [SE2005] 27 LM* 05 34 08.0517007298 -00 47 01.547342905       19.46 17.33 ~ 1 0
30 V* V1929 Ori Or* 05 34 09.7731285706 -00 42 06.539240989       16.63 15.15 ~ 3 0
31 V* V1930 Ori Or* 05 34 10.1197487868 -00 46 10.286409273       16.27 14.80 ~ 3 0
32 [SE2005] 30 LM* 05 34 11.8320708476 -01 04 34.580116286       20.62 18.29 ~ 1 0
33 [SE2005] 31 LM* 05 34 13.5747214176 -00 44 49.029395437       19.20 17.14 ~ 1 0
34 [SE2005] 32 LM* 05 34 14.2247150049 -00 42 43.827269727       18.31 16.23 ~ 2 0
35 [SE2005] 33 LM* 05 34 14.6127829803 -00 52 59.319996325       18.35 16.19 ~ 1 0
36 [SE2005] 34 LM* 05 34 14.8732568636 -00 42 54.285068482       17.84 16.04 ~ 2 0
37 [SE2005] 35 LM* 05 34 15.9022955795 -00 43 16.993375677       18.99 16.98 ~ 1 0
38 2MASS J05341591-0039385 LM* 05 34 15.918 -00 39 38.55       21.71 19.16 ~ 1 0
39 [SE2005] 37 LM* 05 34 18.5093506251 -00 33 24.412196095       16.39 14.74 ~ 2 0
40 [SE2005] 38 LM* 05 34 19.9727432468 -01 02 13.930553375       18.98 16.88 ~ 1 0
41 V* V1946 Ori Or* 05 34 20.4851686452 -00 59 59.727538895       19.20 17.18 ~ 3 0
42 2MASS J05342056-0102047 LM* 05 34 20.566 -01 02 04.79       21.93 19.25 ~ 1 0
43 [SE2005] 41 LM* 05 34 20.9616616042 -00 54 50.459606414       19.65 17.56 ~ 1 0
44 [SE2005] 42 LM* 05 34 23.3477443143 -00 43 55.303072090       16.76 15.08 ~ 2 0
45 [SE2005] 43 LM* 05 34 23.5820327705 -01 01 19.015557476       16.42 14.79 ~ 2 0
46 V* V1952 Ori Or* 05 34 23.63088 -00 43 08.9688       18.79 16.58 ~ 3 0
47 V* V1953 Ori Or* 05 34 23.8557909421 -00 56 53.331729488       18.55 16.65 ~ 3 0
48 [SE2005] 46 LM* 05 34 24.8378115309 -01 04 18.905142960       15.75 14.29 ~ 2 0
49 [SE2005] 47 LM* 05 34 25.3659883002 -00 52 23.374899832       19.41 17.43 ~ 1 0
50 [SE2005] 48 LM* 05 34 26.1881127744 -00 41 29.362617648       18.48 16.60 ~ 1 0
51 2MASS J05342629-0033443 Y*O 05 34 26.2984347478 -00 33 44.340632935       16.53 14.44 ~ 4 0
52 Kiso A-0904 22 Y*O 05 34 26.3693715976 -00 33 51.241305341     17.2 15.86 14.27 ~ 6 0
53 V* V1959 Ori LM* 05 34 27.0157345303 -00 54 22.743989751       17.43 15.75 M2.9V 4 0
54 [SE2005] 52 LM* 05 34 28.6507907515 -00 49 26.175102992       19.56 17.58 ~ 1 0
55 [SE2005] 53 LM* 05 34 28.9982043783 -01 04 04.133317612       16.77 15.30 ~ 1 0
56 2MASS J05342928-0104039 LM* 05 34 29.2867888873 -01 04 03.908662257       17.09 15.37 ~ 1 0
57 [SE2005] 55 LM* 05 34 31.6940381449 -00 55 46.685381232       18.39 16.34 ~ 1 0
58 V* V1977 Ori Or* 05 34 31.8756163223 -00 35 24.019722121       17.51 15.89 ~ 2 0
59 [SE2005] 57 LM* 05 34 32.2499427018 -00 59 36.179266384       17.31 15.71 ~ 1 0
60 [SE2005] 58 LM* 05 34 32.8599831937 -00 45 17.833708278       15.34 14.04 ~ 2 0
61 [SE2005] 59 LM* 05 34 35.0639219348 -00 57 37.134166131       19.08 17.00 ~ 1 0
62 V* V1989 Ori Or* 05 34 35.6750643010 -00 51 57.126299280       17.80 16.15 ~ 2 0
63 V* V1995 Ori Or* 05 34 37.7578895889 -00 52 39.604510091       17.20 15.57 ~ 2 0
64 [SE2005] 62 LM* 05 34 37.9491711787 -00 38 06.426795907       21.35 18.91 ~ 1 0
65 V* V1999 Ori Al* 05 34 39.4754370126 -00 54 32.086342452       19.76 17.79 M3.9V 5 0
66 [SE2005] 64 LM* 05 34 39.8820182675 -00 33 30.415931427       17.96 16.02 ~ 1 0
67 2MASS J05344491-0043501 Y*O 05 34 44.9119788292 -00 43 50.072674218       16.36 14.84 ~ 3 0
68 V* V2018 Ori Or* 05 34 44.91360 -01 04 24.9384       21.82 19.42 ~ 3 0
69 [SE2005] 66 LM* 05 34 44.9478838872 -00 56 36.574409863       17.16 15.52 ~ 1 0
70 [SE2005] 68 LM* 05 34 45.1633501532 -00 51 58.073357168       18.67 16.77 ~ 1 0
71 V* V2022 Ori Or* 05 34 45.7096966352 -00 52 23.511187375       18.55 16.48 ~ 2 0
72 V* V2032 Ori Or* 05 34 47.8235089634 -00 44 01.469431344       21.21 18.77 ~ 3 0
73 [SE2005] 71 LM* 05 34 47.9988415579 -00 37 17.834825448       16.62 14.80 ~ 3 0
74 2MASS J05345064-0042351 LM* 05 34 50.644 -00 42 35.12       22.59 19.81 ~ 1 0
75 [SE2005] 73 LM* 05 34 50.7232698138 -01 01 05.925144471       18.41 16.53 ~ 1 0
76 [SE2005] 74 LM* 05 34 51.0819852612 -00 55 52.268166423       20.65 18.30 ~ 1 0
77 [SE2005] 75 LM* 05 34 52.9081792197 -00 49 34.827087218       18.48 16.67 ~ 1 0
78 [SE2005] 76 LM* 05 34 55.7874470243 -00 47 30.210452461       20.34 18.08 ~ 1 0
79 [SE2005] 77 LM* 05 34 56.5366950042 -01 04 45.169619626       16.95 15.33 ~ 1 0
80 [SE2005] 78 LM* 05 34 56.7616679660 -00 55 33.182321220       17.67 15.94 ~ 1 0
81 NAME Orion Nebula Cluster OpC 05 35.0 -05 29           ~ 2031 1
82 [SE2005] 79 LM* 05 35 00.1132218998 -01 00 31.658226735       17.93 16.23 ~ 1 0
83 V* V2101 Ori Or* 05 35 00.3537070849 -00 59 16.629704524       17.66 15.57 ~ 3 0
84 V* V2116 Ori Or* 05 35 01.6932217140 -00 46 45.461205158       17.63 15.74 ~ 3 0
85 [SE2005] 82 LM* 05 35 01.7750303934 -00 59 54.507345041       15.15 13.93 ~ 3 0
86 V* V2117 Ori Or* 05 35 01.9624968473 -00 37 34.887247882       16.98 15.43 ~ 3 0
87 V* V2122 Ori Or* 05 35 02.5851619006 -01 01 16.332881246       17.76 15.96 ~ 3 0
88 2MASS J05350601-0102567 LM* 05 35 06.0257084616 -01 02 56.691579531       18.48 16.57 ~ 1 0
89 [SE2005] 86 LM* 05 35 07.9118528553 -00 37 43.289050785       18.52 16.32 ~ 1 0
90 V* V2227 Ori Or* 05 35 12.7929049932 -00 36 48.568822860       18.14 16.35 M3.3V 4 0
91 UCAC3 179-24430 LM* 05 35 12.908 -00 34 19.52       16.40 14.88 ~ 1 0
92 [SE2005] 90 LM* 05 35 15.6159692879 -00 34 42.214095122       18.58 16.44 ~ 1 0
93 2MASS J05351596-0102299 LM* 05 35 15.962 -01 02 29.90       24.40 21.14 ~ 1 0
94 [SE2005] 92 LM* 05 35 16.0265400642 -00 59 40.020613788       17.98 16.11 ~ 1 0
95 NAME Trapezium Cluster As* 05 35 16.5 -05 23 14           ~ 1491 1
96 V* V2308 Ori Ro* 05 35 17.5456036552 -01 02 26.491598718       20.83 18.08 ~ 3 0
97 [SE2005] 94 LM* 05 35 18.2792044993 -01 00 51.954752642       16.43 14.79 ~ 1 0
98 [SE2005] 95 LM* 05 35 18.5465072710 -00 55 57.863503011       17.44 15.83 ~ 2 0
99 [SE2005] 96 LM* 05 35 18.5798675822 -00 37 32.231195054       19.50 17.33 ~ 1 0
100 [SE2005] 97 LM* 05 35 18.9954690885 -01 02 27.764582820       15.96 14.34 ~ 2 0
101 [SE2005] 98 LM* 05 35 19.6335696415 -00 35 09.008258771       19.59 17.18 ~ 1 0
102 2MASS J05352244-0040032 Y*O 05 35 22.4416536728 -00 40 03.261174637       16.42 14.77 ~ 3 0
103 [SE2005] 100 LM* 05 35 23.1510636940 -00 57 31.329499016       19.28 17.26 ~ 1 0
104 2MASS J05352371-0043039 Y*O 05 35 23.7144708714 -00 43 03.862103987       16.19 14.39 ~ 2 0
105 [SE2005] 102 LM* 05 35 24.5497697244 -00 48 47.727336075       17.26 15.47 ~ 1 0
106 [SE2005] 103 LM* 05 35 25.1931018357 -00 44 24.429606483       15.91 14.45 ~ 2 0
107 V* V2433 Ori Y*O 05 35 25.2207078621 -00 43 24.327520451     16.9 15.94 15.06 ~ 6 0
108 [SE2005] 105 LM* 05 35 25.6240778840 -01 02 55.856615112       15.95 14.02 ~ 2 0
109 [SE2005] 106 LM* 05 35 26.0588821271 -01 01 38.542184040       17.30 15.58 ~ 1 0
110 2MASS J05352656-0043251 LM* 05 35 26.567 -00 43 25.16       20.59 18.31 ~ 1 0
111 2MASS J05352896-0040428 LM* 05 35 28.9677097352 -00 40 42.912012015       17.50 15.77 ~ 1 0
112 [SE2005] 109 LM* 05 35 29.0015604235 -00 46 20.773897551       18.51 16.68 ~ 1 0
113 V* V2512 Ori Ro* 05 35 32.2248715478 -00 56 37.468780042       18.53 16.44 ~ 2 0
114 [SE2005] 111 LM* 05 35 33.4994246342 -01 04 26.336976933       17.64 15.93 ~ 1 0
115 [SE2005] 112 LM* 05 35 33.5184571480 -00 55 23.916052251       20.69 18.38 ~ 2 0
116 V* V2530 Ori Ro* 05 35 34.0576303338 -01 03 56.069170943       19.30 17.17 ~ 3 0
117 [SE2005] 114 LM* 05 35 34.4336584340 -00 57 18.375305154       19.49 17.14 ~ 1 0
118 USNO-B1.0 0889-00063276 LM* 05 35 36.782 -01 00 53.86   19.9   18.52 16.32 ~ 1 0
119 [SE2005] 117 LM* 05 35 37.3450217827 -00 46 35.404140636       19.59 17.27 ~ 1 0
120 V* V2556 Ori BY* 05 35 37.5906113700 -01 02 50.532408132       17.02 15.27 ~ 2 0
121 2MASS J05353802-0046342 LM* 05 35 38.0272133944 -00 46 34.262108097       18.86 16.61 ~ 1 0
122 V* V2559 Ori LM* 05 35 38.5089218758 -00 51 11.477367725       16.72 15.02 M3.2V 5 0
123 [SE2005] 121 LM* 05 35 39.7976040015 -00 42 37.201131645       18.53 16.62 ~ 1 0
124 [SE2005] 122 LM* 05 35 41.0615014836 -00 42 12.275922154       17.69 15.96 ~ 1 0
125 V* V2576 Ori BY* 05 35 42.6034212122 -00 42 00.780940503       19.83 17.51 ~ 3 0
126 [SE2005] 124 LM* 05 35 42.8962999285 -00 50 25.291684430       17.79 16.02 ~ 1 0
127 [SE2005] 125 LM* 05 35 43.2056704206 -00 35 30.762349641       19.50 17.42 ~ 1 0
128 V* V2584 Ori BY* 05 35 43.6328362734 -00 46 46.496942928       20.33 17.87 ~ 4 0
129 2MASS J05354368-0036487 LM* 05 35 43.6948691130 -00 36 48.753807884       17.78 16.00 ~ 1 0
130 [SE2005] 128 LM* 05 35 43.9765051134 -00 56 09.767894497       15.50 13.98 ~ 1 0
131 [SE2005] 129 LM* 05 35 44.0394157679 -00 33 20.775270565       18.95 16.88 ~ 1 0
132 [SE2005] 130 LM* 05 35 44.1632349420 -00 44 52.587225174       19.67 17.64 ~ 1 0
133 2MASS J05354477-0052501 LM* 05 35 44.7758453982 -00 52 50.235027063       15.64 14.21 ~ 3 0
134 V* V2587 Ori BY* 05 35 45.3124610821 -00 53 32.231102006       18.19 16.26 ~ 2 0
135 2MASS J05354532-0049027 LM* 05 35 45.328 -00 49 02.72       22.86 19.90 ~ 1 0
136 2MASS J05354579-0048120 LM* 05 35 45.8060489642 -00 48 11.721740562       20.29 18.15 ~ 1 0
137 [SE2005] 135 LM* 05 35 46.1191860720 -00 37 33.146124087       17.78 15.99 ~ 1 0
138 [SE2005] 136 LM* 05 35 46.7769945949 -00 39 31.196697463       19.60 17.53 ~ 1 0
139 2MASS J05354830-0035496 LM* 05 35 48.3091144854 -00 35 49.688207309       16.82 15.14 ~ 2 0
140 [SE2005] 138 LM* 05 35 50.1822615238 -00 54 01.473807773       17.23 15.61 ~ 1 0
141 2MASS J05355104-0104524 LM* 05 35 51.0562721356 -01 04 52.494343613       19.72 17.27 ~ 1 0
142 [SE2005] 141 LM* 05 35 51.1043763759 -00 43 02.628778537       19.07 16.99 ~ 1 0
143 2MASS J05355110-0052051 LM* 05 35 51.1081749343 -00 52 05.137764110       20.46 18.09 ~ 1 0
144 [SE2005] 142 LM* 05 35 51.5297909646 -00 38 33.263262235       19.86 17.59 ~ 1 0
145 2MASS J05355376-0050416 LM* 05 35 53.7709292588 -00 50 41.612206232       17.42 15.69 ~ 2 0
146 * eps Ori s*b 05 36 12.81335 -01 12 06.9089 0.48 1.51 1.69 1.76 1.93 B0Ia 865 0
147 NAME sigma Orionis Cluster MGr 05 38 42 -02 36.0           ~ 496 0
148 * sig Ori Y*O 05 38 44.7665260139 -02 36 00.284709290 2.54 3.58 3.79 3.87 4.11 O9.5V 751 0
149 NGC 2264 OpC 06 40 58 +09 53.7           ~ 1611 0
150 NAME eps Ori Cluster Cl* ~ ~           ~ 19 1
151 Ass Ori OB 1a As* ~ ~           ~ 202 0

    Equat.    Gal    SGal    Ecl

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2021.01.24-02:05:03

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