2011MNRAS.411.2099J


C.D.S. - SIMBAD4 rel 1.7 - 2020.01.25CET15:31:49

2011MNRAS.411.2099J - Mon. Not. R. Astron. Soc., 411, 2099-2112 (2011/March-1)

Investigating coronal saturation and supersaturation in fast-rotating M-dwarf stars.

JEFFRIES R.D., JACKSON R.J., BRIGGS K.R., EVANS P.A. and PYE J.P.

Abstract (from CDS):

At fast rotation rates, the coronal activity of G- and K-type stars has been observed to `saturate' and then decline again at even faster rotation rates - a phenomenon dubbed `supersaturation'. In this paper, we investigate coronal activity in fast-rotating M-dwarfs using deep XMM-Newton observations of 97 low-mass stars of known rotation period in the young open cluster NGC 2547 and combine these with published X-ray surveys of low-mass field and cluster stars of known rotation period. Like G- and K-dwarfs, we find that M-dwarfs exhibit increasing coronal activity with decreasing Rossby number NR, the ratio of period to convective turnover time, and that activity saturates at LX/Lbol≃ 10–3 for log NR< -0.8. However, supersaturation is not convincingly displayed by M-dwarfs, despite the presence of many objects in our sample with log NR< -1.8, where supersaturation is observed to occur in higher mass stars. Instead, it appears that a short rotation period is the primary predictor of supersaturation; P ≤ 0.3 d for K-dwarfs and perhaps P ≤ 0.2 d for M-dwarfs. These observations favour the `centrifugal stripping' model for supersaturation, where coronal structures are forced open or become radiatively unstable as the Keplerian corotation radius moves inside the X-ray-emitting coronal volume.

Abstract Copyright: 2010 The Authors Monthly Notices of the Royal Astronomical Society2010 RAS

Journal keyword(s): stars: activity - stars: coronae - stars: rotation - open clusters and associations: individual: NGC 2547 - X-rays: stars

VizieR on-line data: <Available at CDS (J/MNRAS/411/2099): table1.dat table2.dat>

Simbad objects: 106

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Number of rows : 106

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 Cl Melotte 20 OpC 03 26 42 +48 48.0           ~ 744 0
2 UCAC4 570-008332 ** 03 44 31.978032 +23 52 30.73116   16.05 14.56 14.34 12.377 ~ 22 0
3 V* OW Tau Fl* 03 45 48.9405503897 +23 51 10.395925581   15.74 14.27   12.51 Me 40 0
4 Cl* Melotte 22 DH 462 PM* 03 46 37.7719272739 +24 44 51.680114556   12.80 11.92   10.89 K0V 42 0
5 Cl Melotte 22 OpC 03 47 00 +24 07.0           ~ 2925 0
6 Cl Melotte 25 OpC 04 26 54.00 +15 52 00.0           ~ 2605 0
7 2MASS J08084224-4911252 LM* 08 08 42.2484182682 -49 11 25.262584587   15.485 14.403   12.88 K7 8 0
8 2MASS J08084386-4922097 LM* 08 08 43.8600969139 -49 22 09.715186343     19.50   16.35 ~ 5 0
9 2MASS J08084618-4916240 LM* 08 08 46.1514022858 -49 16 23.598606156     17.61   15.15 ~ 5 0
10 2MASS J08085228-4923097 LM* 08 08 52.290 -49 23 09.74     21.27   17.92 ~ 3 0
11 Cl* NGC 2547 OJD 13 LM* 08 08 53.4374985347 -49 13 26.649574295     18.71   16.08 ~ 5 0
12 2MASS J08085758-4911261 LM* 08 08 57.5838932044 -49 11 26.177203746     18.29   15.82 ~ 6 0
13 GES J08090022-4920332 LM* 08 09 00.2278796523 -49 20 33.289743140   15.692 14.596 13.940 13.370 ~ 10 0
14 UCAC2 10579403 LM* 08 09 07.2181844009 -49 19 14.483431742     14.884 14.11 13.61 K5 13 0
15 2MASS J08090806-4921595 LM* 08 09 08.0731880434 -49 21 59.470930313     21.54   18.20 ~ 5 0
16 2MASS J08090910-4922405 LM* 08 09 09.1017644040 -49 22 40.448783265   19.975 18.269 17.066 15.398 ~ 7 0
17 2MASS J08090923-4920425 LM* 08 09 09.2415252373 -49 20 42.529009111     19.82   16.99 ~ 5 0
18 2MASS J08091206-4910152 LM* 08 09 12.0758504779 -49 10 15.331271767     19.36   16.68 ~ 6 0
19 2MASS J08091316-4917385 LM* 08 09 13.1776591285 -49 17 38.557807889     19.99   17.07 ~ 5 0
20 Cl* NGC 2547 OJD 3 LM* 08 09 13.9181417314 -49 13 18.718450068     18.17   15.71 ~ 6 0
21 2MASS J08091645-4907239 LM* 08 09 16.4596783611 -49 07 23.959711275   18.849 17.364 16.286 14.759 ~ 9 0
22 2MASS J08091713-4925277 LM* 08 09 17.1407336862 -49 25 27.795837481     18.04   15.50 ~ 6 0
23 2MASS J08091770-4908344 LM* 08 09 17.7193386768 -49 08 34.540548567     19.57   16.41 M4.5 9 0
24 Cl* NGC 2547 NTJ 17-799 LM* 08 09 21.3193363210 -49 05 54.098924958   18.439 16.831 15.905 14.538 M1 10 0
25 2MASS J08092353-4916271 LM* 08 09 23.5327487591 -49 16 27.184535346     20.33   17.34 ~ 4 0
26 Cl* NGC 2547 JND 17-220 LM* 08 09 24.3845781719 -49 06 28.317231340   18.718 17.225 16.303 14.943 M2 10 0
27 2MASS J08092574-4903156 LM* 08 09 25.7406033791 -49 03 15.585124416     19.16   16.24 ~ 6 0
28 Cl* NGC 2547 JND 14-370 LM* 08 09 25.9171593985 -49 09 58.557594061   20.265 18.640 17.470 15.845 ~ 8 0
29 2MASS J08092629-4913257 LM* 08 09 26.2984897733 -49 13 25.588875134     20.38   17.46 ~ 3 0
30 GES J08093443-4906027 LM* 08 09 34.4376897735 -49 06 02.723840024     19.526 18.183 16.353 ~ 8 0
31 Cl* NGC 2547 JND 14-105 LM* 08 09 36.8505000672 -49 14 21.443208372   17.403 15.927 15.062 13.900 M1 9 0
32 Cl* NGC 2547 OJD 34 LM* 08 09 37.1689327012 -49 05 59.535427997   20.962 19.248   16.38 M4 10 0
33 2MASS J08093744-4902027 LM* 08 09 37.4532902722 -49 02 02.799562319   19.172 17.667 16.692 15.282 ~ 8 0
34 Cl* NGC 2547 JND 14-178 LM* 08 09 38.9233193490 -49 15 05.106058003   18.988 17.529 16.391 14.940 ~ 7 0
35 2MASS J08093925-4928494 LM* 08 09 39.2556770355 -49 28 49.486946178     17.92   15.51 ~ 6 0
36 2MASS J08094273-4921168 LM* 08 09 42.7378905745 -49 21 16.851288567     18.78   16.21 ~ 5 0
37 [GBR2007] ID 12 LM* 08 09 42.8851591882 -49 03 41.294711411     19.97   16.78 ~ 4 0
38 2MASS J08094425-4918437 LM* 08 09 44.258 -49 18 43.74     20.34   17.40 ~ 3 0
39 2MASS J08094490-4918342 LM* 08 09 44.8990769018 -49 18 34.236994028     18.38   15.67 ~ 4 0
40 Cl* NGC 2547 JND 14-273 LM* 08 09 44.9766070304 -49 06 24.111548507   19.775 18.228 17.067 15.365 M4 9 0
41 GES J08094556-4917365 LM* 08 09 45.5573728394 -49 17 36.487752517   17.773 16.311 15.338 14.358 M0 12 0
42 2MASS J08094698-4913026 LM* 08 09 46.9714698521 -49 13 02.575991970   16.249 15.57   13.96 ~ 5 0
43 NGC 2547 OpC 08 09 52.360 -49 10 35.01           ~ 303 0
44 2MASS J08095604-4911161 LM* 08 09 56.0472732419 -49 11 16.188973387     20.11   17.26 ~ 4 0
45 UCAC2 10579595 LM* 08 09 56.4411047054 -49 22 10.938814118   17.299 15.915 15.093 14.187 M0 13 0
46 Cl* NGC 2547 NTJ 13-2353 LM* 08 10 01.7957192234 -49 15 45.432140077   18.989 17.570   15.189 M1 11 0
47 2MASS J08100178-4912585 LM* 08 10 01.8415291756 -49 12 58.687994397     21.58   18.25 ~ 3 0
48 2MASS J08100412-4915577 LM* 08 10 04.1129544452 -49 15 57.785163093   20.321 18.696 17.508 15.913 ~ 6 0
49 [IHA2008] N2547-1-6-2487 LM* 08 10 04.56 -49 06 04.2     14.26   13.26 ~ 2 0
50 2MASS J08100459-4911388 LM* 08 10 04.5969452867 -49 11 38.865663048     20.12   17.17 ~ 4 0
51 Cl* NGC 2547 NTJ 18-508 LM* 08 10 05.0817810148 -49 01 57.511054446   18.456 16.980 16.078 14.847 M1 9 0
52 Cl* NGC 2547 NTJ 13-872 LM* 08 10 05.4220361734 -49 07 58.578574997   20.026 18.455 17.299 15.732 M4 10 0
53 Cl* NGC 2547 OJD 14 LM* 08 10 07.0743322505 -49 12 59.781724435   20.164 18.631 17.554 15.954 M4 12 0
54 GES J08100749-4910447 LM* 08 10 07.4819434649 -49 10 44.740064097   17.675 16.279 15.351 14.415 M0 13 0
55 GES J08100893-4915413 LM* 08 10 08.9346099719 -49 15 41.411495519   16.767 15.479 14.776 13.981 K7 13 0
56 2MASS J08101213-4904315 LM* 08 10 12.1316622397 -49 04 31.622086555     19.62   16.85 ~ 6 0
57 Cl* NGC 2547 NTJ 8-2512 LM* 08 10 13.7469659968 -49 17 11.298781611   19.258 17.757 16.754 15.281 ~ 10 0
58 2MASS J08101431-4928268 LM* 08 10 14.3049713078 -49 28 26.813487194     17.77   15.37 ~ 6 0
59 [IHA2008] N2547-1-6-5129 LM* 08 10 14.8996354130 -49 02 22.344248257     15.91   14.22 ~ 4 0
60 2MASS J08101766-4923295 LM* 08 10 17.6668028476 -49 23 29.574673222     19.89   17.15 ~ 3 0
61 2MASS J08101787-4926144 LM* 08 10 17.8629142687 -49 26 14.513266812     20.93   17.83 ~ 3 0
62 2MASS J08101841-4926312 LM* 08 10 18.4094748221 -49 26 31.202711779     18.95   16.04 ~ 7 0
63 Cl* NGC 2547 NTJ 18-2246 LM* 08 10 18.4217866195 -49 02 14.534710224   17.589 16.246   14.199 ~ 8 0
64 Cl* NGC 2547 NTJ 13-695 LM* 08 10 25.5393956970 -49 06 33.555831051   18.218 16.745   14.684 M1 9 0
65 Cl* NGC 2547 NTJ 8-1089 LM* 08 10 27.4043083299 -49 20 19.724425417   20.040 18.558 17.468 15.813 M4 11 0
66 2MASS J08103088-4910443 LM* 08 10 30.8841987295 -49 10 44.345833973   19.073 17.550   15.153 M2 11 0
67 GES J08103186-4921296 LM* 08 10 31.8640168673 -49 21 29.723668654   16.481 15.230 14.408 13.655 K7 14 0
68 Cl* NGC 2547 OJD 4 LM* 08 10 32.5884580252 -49 09 43.674948183     18.13   15.76 ~ 5 0
69 Cl* NGC 2547 NTJ 18-2432 LM* 08 10 35.4957100033 -49 05 00.124265008   15.905 14.768 14.121 13.432 ~ 8 0
70 Cl* NGC 2547 JND 13-130 LM* 08 10 35.5907270979 -49 10 27.928718849   16.291 15.136 14.442 13.729 K5 10 0
71 2MASS J08103571-4927495 LM* 08 10 35.7047497052 -49 27 49.547690267     17.11   14.97 ~ 6 0
72 GES J08103572-4909008 LM* 08 10 35.7209500353 -49 09 00.873249375   17.335 15.988 15.201 14.239 M0 12 0
73 [JT98] 78 LM* 08 10 37.3390554292 -49 28 10.442899672   18.826 18.109   15.55 ~ 7 0
74 2MASS J08103780-4910118 LM* 08 10 37.8043390038 -49 10 11.862382314   20.476 19.128 17.880 16.169 ~ 7 0
75 [JEP2006] 144 LM* 08 10 40.6102210234 -49 07 05.584321101   20.250 18.767 17.511 15.861 M4 9 0
76 Cl* NGC 2547 JND 19-312 LM* 08 10 41.0861647420 -49 07 52.513865540   19.897 18.323 17.074 15.444 M4 9 0
77 2MASS J08104123-4912219 LM* 08 10 41.2288671415 -49 12 21.950509719     21.10   17.89 ~ 4 0
78 2MASS J08104235-4927530 LM* 08 10 42.358 -49 27 53.07     19.37   16.46 ~ 3 0
79 2MASS J08104252-4924552 LM* 08 10 42.5171282200 -49 24 55.249057541     19.09   16.19 ~ 6 0
80 2MASS J08104570-4906171 LM* 08 10 45.6990672196 -49 06 17.158471376   18.568 17.066 15.965 14.573 M3 10 0
81 2MASS J08104614-4906283 LM* 08 10 46.1307152656 -49 06 28.344120592     20.75   17.72 ~ 5 0
82 2MASS J08104682-4903475 LM* 08 10 46.8227607867 -49 03 47.636537321     20.06   17.18 ~ 5 0
83 2MASS J08104689-4921338 LM* 08 10 46.8861141389 -49 21 33.939486412     20.44   17.23 ~ 6 0
84 2MASS J08104693-4915213 LM* 08 10 46.9394333931 -49 15 21.440998519     19.77   16.99 ~ 3 0
85 Cl* NGC 2547 NTJ 9-858 LM* 08 10 47.9339814913 -49 17 07.964352018   18.363 16.867 15.908 14.725 ~ 8 0
86 2MASS J08104805-4916295 LM* 08 10 48.0527866476 -49 16 29.532954375     19.18   16.48 ~ 6 0
87 Cl* NGC 2547 OJD 2 LM* 08 10 48.3622545416 -49 15 25.008989803   19.668 18.278 17.217 15.630 M4 12 0
88 2MASS J08104978-4908197 LM* 08 10 49.7867399499 -49 08 19.813813595     19.80   16.95 ~ 6 0
89 2MASS J08105013-4922476 LM* 08 10 50.1403035994 -49 22 47.574074703   20.719 18.971 17.819 16.079 ~ 7 0
90 [IHA2008] N2547-1-7-1890 LM* 08 10 52.9875691959 -49 07 16.296640287     20.33   17.10 ~ 4 0
91 2MASS J08105330-4916485 LM* 08 10 53.2784588509 -49 16 48.401727214     21.35   18.10 ~ 4 0
92 2MASS J08105354-4911429 LM* 08 10 53.5508401090 -49 11 42.985319597     19.49   16.80 ~ 5 0
93 2MASS J08105610-4918399 LM* 08 10 56.0996871877 -49 18 39.884897315   19.178 17.611 16.536 14.996 M4 11 0
94 2MASS J08105917-4904277 LM* 08 10 59.1853391453 -49 04 27.797318972     19.95   16.89 ~ 7 0
95 2MASS J08105943-4908329 LM* 08 10 59.4350730934 -49 08 32.940814425   20.140 18.617   15.845 ~ 8 0
96 2MASS J08110268-4911084 LM* 08 11 02.6815992286 -49 11 08.481013301     19.55   16.73 ~ 5 0
97 2MASS J08110583-4916250 LM* 08 11 05.8381696933 -49 16 25.095673186     20.50   17.46 ~ 4 0
98 2MASS J08110699-4912236 LM* 08 11 06.9970492265 -49 12 23.620398894     20.12   17.24 ~ 5 0
99 GES J08110759-4921423 LM* 08 11 07.5955092312 -49 21 42.244483715   18.733 17.279 16.244 14.783 ~ 8 0
100 2MASS J08110933-4911533 LM* 08 11 09.3343745435 -49 11 53.418837256   20.784 19.111 17.979 16.218 ~ 9 0
101 2MASS J08111669-4922290 LM* 08 11 16.6875592413 -49 22 29.000580159     18.88   16.21 ~ 5 0
102 GES J08112213-4921470 LM* 08 11 22.1397087689 -49 21 47.132336574   17.477 16.049 15.110 14.152 ~ 8 0
103 2MASS J08112282-4922149 LM* 08 11 22.8211586991 -49 22 14.776799336     20.43   17.42 ~ 4 0
104 2MASS J08113107-4914105 LM* 08 11 31.0735677666 -49 14 10.533900233     19.72   17.01 ~ 4 0
105 IC 2391 OpC 08 40 32 -53 02.0           ~ 707 0
106 IC 2602 OpC 10 42 58 -64 24.0           ~ 543 0

    Equat.    Gal    SGal    Ecl

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2020.01.25-15:31:50

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