2020ApJ...905..107M


C.D.S. - SIMBAD4 rel 1.7 - 2021.04.15CEST06:45:28

2020ApJ...905..107M - Astrophys. J., 905, 107-107 (2020/December-3)

Flare rates, rotation periods, and spectroscopic activity indicators of a volume-complete sample of mid- to late-M dwarfs within 15 pc.

MEDINA A.A., WINTERS J.G., IRWIN J.M. and CHARBONNEAU D.

Abstract (from CDS):

We present a study of flare rates, rotation periods, and spectroscopic activity indicators of 125 single stars within 15 parsecs and with masses between 0.1 and 0.3 M observed during the first year of the TESS mission, with the goal of elucidating the relationship between these various magnetically connected phenomena. We gathered multiepoch high-resolution spectra of each target, and we measured equivalent widths of the activity indicators helium I D3, Hα, and the calcium infrared triplet line at 8542.09 Å. We present 18 new rotation periods from MEarth photometry and 19 new rotation periods from TESS photometry. We present a catalog of 1392 flares. After correcting for sensitivity, we find the slope of the flare frequency distribution for all stars to have a standard value of α = 1.98 ± 0.02. We determine R31.5, the rate of flares per day with energies above E = 3.16 x 1031 ergs in the TESS bandpass. We find that below a critical value of Hα EW = -0.71 Å, log R31.5 increases linearly with increasing Hα emission; above this value, log R31.5 declines rapidly. The stars divide into two groups: 26% have Hα in emission, high flare rates with typical values of log R31.5 = -1.30 ± 0.08, and have Rossby numbers <0.50. The remaining 74% show little to no Hα in emission and exhibit log R31.5 < -3.86, with the majority of these stars not showing a single flare during the TESS observations.

Abstract Copyright: © 2020. The American Astronomical Society. All rights reserved.

Journal keyword(s): Stellar activity - Stellar rotation - Stellar flares

Status at CDS : Large table(s) will be appraised for possible ingestion in VizieR.

Simbad objects: 26

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Number of rows : 26

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 HD 3765 PM* 00 40 49.2699101367 +40 11 13.819725965   8.30   6.8   K2V 244 0
2 G 268-38 PM* 00 44 59.3314993038 -15 16 17.543124886     14.150 13.801   M4.5 88 0
3 L 87-10 PM* 01 04 06.9582412332 -65 22 27.186140765   15.677 13.950 13.641   M4 11 0
4 V* YZ Cet Er* 01 12 30.6367741360 -16 59 56.361313690 15.315 13.885 12.074 10.696 8.938 M4.0Ve 212 0
5 APMPM J0237-5928 PM* 02 36 32.4596402682 -59 28 05.545239213       13.961   M4.5V 18 0
6 NGC 1039 OpC 02 42 05 +42 45.7           ~ 382 0
7 UCAC4 098-002679 PM* 02 46 02.2636916945 -70 24 06.259426986   15.71 14.874 13.44 11.61 ~ 9 0
8 Cl Melotte 22 OpC 03 47 00 +24 07.0           ~ 3073 0
9 UPM J0409-4435 PM* 04 09 32.3437623431 -44 35 39.414978603   15.923 14.250     ~ 4 0
10 G 7-34 Er* 04 17 18.5333071979 +08 49 22.014836895   15.6 13.84 12.50 10.75 M5V 44 0
11 Cl Melotte 25 OpC 04 26 54.00 +15 52 00.0           ~ 2752 0
12 UCAC4 211-005570 PM* 05 05 14.4286982738 -47 56 15.529359543   15.960 14.365     ~ 5 0
13 M 1 SNR 05 34 31.94 +22 00 52.2           ~ 5723 4
14 2MASS J07545484-3809381 PM* 07 54 54.8424626279 -38 09 37.777686916   16.90 15.46 14.68 11.75 ~ 8 0
15 NGC 2632 OpC 08 40 24 +19 40.0           ~ 1296 0
16 2MASS J09141746-4134383 PM* 09 14 17.4289186350 -41 34 37.850434402   16.33 15.01 13.69 10.98 ~ 7 0
17 L 320-124 PM* 10 14 51.7783473599 -47 09 24.189733387       13.067   M4 77 0
18 NAME Proxima Centauri Er* 14 29 42.9451234609 -62 40 46.170818907 14.21 12.95 11.13 9.45 7.41 M5.5Ve 1028 0
19 SCR J1855-6914 PM* 18 55 47.8711538708 -69 14 14.928285478     16.61 14.79 12.66 M6e 10 0
20 EGGR 375 WD* 19 18 58.6308363300 +38 43 21.478033383   15.02   14.1   DC7 65 1
21 G 208-42 Er* 19 51 09.3205269987 +46 29 00.208931632   14.47   12.544   M4.0V 126 0
22 G 208-44 Er* 19 53 54.4821159649 +44 24 51.341564299   15.31 13.126 13.083 9.78 M5.5Ve 193 1
23 G 208-45 Er* 19 53 55.1388332012 +44 24 54.144273353   15.97 13.99 14.3 10.27 M6V 167 0
24 L 499-56 PM* 22 02 29.37552 -37 04 51.3516   12.8   11.420   M3.0V 50 0
25 LHS 3844 PM* 22 41 58.1173365142 -69 10 08.320922853   17.3       ~ 27 0
26 UCAC4 026-011435 PM* 23 30 38.1788263306 -84 55 18.920320665   16.282 14.443 14.089   ~ 6 0

    Equat.    Gal    SGal    Ecl

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2021.04.15-06:45:29

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