2009AJ....138..633K

Query : 2009AJ....138..633K

2009AJ....138..633K - Astron. J., 138, 633-648 (2009/August-0)

M dwarfs in Sloan Digital Sky Survey stripe 82: photometric light curves and flare rate analysis.

KOWALSKI A.F., HAWLEY S.L., HILTON E.J., BECKER A.C., WEST A.A., BOCHANSKI J.J. and SESAR B.

Abstract (from CDS):

We present a flare rate analysis of 50,130 M dwarf light curves in Sloan Digital Sky Survey Stripe 82. We identified 271 flares using a customized variability index to search ∼2.5 million photometric observations for flux increases in the u and g bands. Every image of a flaring observation was examined by eye and with a point-spread function-matching and image subtraction tool to guard against false positives. Flaring is found to be strongly correlated with the appearance of Hα in emission in the quiet spectrum. Of the 99 flare stars that have spectra, we classify eight as relatively inactive. The flaring fraction is found to increase strongly in stars with redder colors during quiescence, which can be attributed to the increasing flare visibility and increasing active fraction for redder stars. The flaring fraction is strongly correlated with|Z| distance such that most stars that flare are within 300 pc of the Galactic plane. We derive flare u-band luminosities and find that the most luminous flares occur on the earlier-type m dwarfs. Our best estimate of the lower limit on the flaring rate (averaged over Stripe 82) for flares with Δu ≥ 0.7 mag on stars with u < 22 is 1.3 flares/hr/deg2 but can vary significantly with the line of sight.

Abstract Copyright: ∼

Journal keyword(s): methods: data analysis - stars: activity - stars: flare - stars: late-type

Simbad objects: 80

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Number of rows : 80
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 SDSS J001208.38+002559.1 * 00 12 08.38 +00 25 59.2           ~ 1 0
2 2MASS J00414591-0028326 * 00 41 45.9172682928 -00 28 32.748977856           ~ 3 0
3 UCAC4 456-001222 * 00 58 47.7737597088 +01 10 15.488665932           ~ 4 0
4 ATO J014.7650-01.2253 V* 00 59 03.6014142528 -01 13 31.223805456           ~ 5 0
5 2MASS J01005257+0102331 * 01 00 52.5809873928 +01 02 33.121646088           K5 2 0
6 2MASS J01130718-0023258 * 01 13 07.1722508976 -00 23 26.188843632           ~ 3 0
7 SDSS J011745.28+005929.4 * 01 17 45.2905484352 +00 59 29.518859364           ~ 1 0
8 2MASS J01253129-0053589 * 01 25 31.2937768656 -00 53 59.021914380           ~ 2 0
9 SDSS J012904.68+003058.4 PM* 01 29 04.6859632776 +00 30 58.494262176           ~ 2 0
10 LP 588-25 EB* 01 38 51.4094210303 -00 16 21.889258632     18.14     M6V 34 0
11 SDSS J020056.76+004149.1 * 02 00 56.7670253808 +00 41 49.114458384           ~ 1 0
12 SDSS J020327.92-000442.1 * 02 03 27.9289201560 -00 04 42.112860168           ~ 1 0
13 SDSS J020911.90+004432.4 * 02 09 11.9105357856 +00 44 32.549024508           ~ 1 0
14 SDSS J022112.48+003225.7 * 02 21 12.4753794432 +00 32 25.735341696           ~ 1 0
15 2MASS J02221434-0032176 * 02 22 14.3516965872 -00 32 17.477154528           M3V 2 0
16 SDSS J023452.37-010031.4 * 02 34 52.3764549792 -01 00 31.405593636           ~ 2 0
17 SDSS J023538.57-000422.2 * 02 35 38.5749269544 -00 04 22.168784928           ~ 1 0
18 SDSS J023547.98-005822.4 * 02 35 47.9794048608 -00 58 22.485727884           ~ 1 0
19 SDSS J023550.72+010136.8 * 02 35 50.7275367552 +01 01 36.905143764           ~ 1 0
20 SDSS J024554.14-010445.1 * 02 45 54.1408235112 -01 04 45.188935968           ~ 1 0
21 SDSS J025747.56+004731.2 PM* 02 57 47.5471250616 +00 47 31.277845356           ~ 3 0
22 2MASS J02595170+0046191 LM* 02 59 51.7074503136 +00 46 19.099902864       16.5 14.7 M5V 8 0
23 SDSS J032605.67-002402.6 * 03 26 05.6728074336 -00 24 02.672327160           ~ 1 0
24 SDSS J033017.55+005359.4 * 03 30 17.5539240120 +00 53 59.406070524           ~ 1 0
25 SDSS J033734.14-011104.5 PM* 03 37 34.1468064048 -01 11 04.439884452           M3.2 7 0
26 SDSS J033735.25+005859.7 PM* 03 37 35.2449855816 +00 58 59.950741224           ~ 1 0
27 LDN 1569 MoC 04 02.4 +01 18           ~ 49 0
28 [DB2002b] G186.03-29.93 MoC 04 16.0 +06 58           ~ 11 0
29 V* YZ CMi PM* 07 44 40.1723046464 +03 33 08.875227574 13.761 12.831 11.225 9.958 8.263 M4.0Ve 957 0
30 ATO J309.9183+00.2240 LM* 20 39 40.3829330304 +00 13 26.756643432           M1 3 0
31 SDSS J204133.37-001958.5 PM* 20 41 33.3695070000 -00 19 58.498441572           ~ 1 0
32 SDSS J204144.10+004048.2 * 20 41 44.1038533008 +00 40 48.232540704           ~ 1 0
33 SDSS J204452.77+010546.9 * 20 44 52.7769842880 +01 05 46.999805028           ~ 1 0
34 SDSS J204725.80+004128.0 * 20 47 25.7981948832 +00 41 28.087108764           ~ 1 0
35 SDSS J204728.12+002206.6 * 20 47 28.1233062024 +00 22 06.634011468           ~ 1 0
36 SDSS J205020.88-010839.9 * 20 50 20.8860621288 -01 08 39.945725916           ~ 1 0
37 SDSS J205059.98+005136.4 PM* 20 50 59.9861610000 +00 51 36.590628312           ~ 3 0
38 SDSS J205257.83-000335.9 * 20 52 57.8331711912 -00 03 35.832142332           ~ 1 0
39 SDSS J205300.05-003821.8 * 20 53 00.0546448344 -00 38 21.870411036           ~ 1 0
40 SDSS J205632.51+001413.5 * 20 56 32.5092147120 +00 14 13.552300752           ~ 1 0
41 SDSS J210012.57-005326.0 * 21 00 12.5678678904 -00 53 25.917995112           ~ 1 0
42 ATO J315.0990-00.9751 BY* 21 00 23.7935160480 -00 58 30.164831832           ~ 4 0
43 SDSS J210034.02-005814.6 PM* 21 00 34.0386937224 -00 58 14.393876808           ~ 4 0
44 ATO J315.9328+00.0509 LM* 21 03 43.8747190392 +00 03 03.115991520           M2+D 3 0
45 SDSS J211110.86+005027.2 * 21 11 10.8552540240 +00 50 27.183887664           ~ 2 0
46 SDSS J211138.04+002137.2 * 21 11 38.0439723288 +00 21 37.288395864           ~ 1 0
47 SDSS J211311.65-002503.2 * 21 13 11.6563719000 -00 25 03.164617956           ~ 1 0
48 SDSS J211414.08-005534.7 PM* 21 14 14.0755064448 -00 55 34.727307888           ~ 3 0
49 SDSS J211454.52-000215.3 * 21 14 54.5228344896 -00 02 15.327198132           ~ 1 0
50 SDSS J211827.00+000248.5 * 21 18 27.0010312032 +00 02 48.557787072           ~ 1 0
51 SDSS J212133.90-011137.4 * 21 21 33.8927796168 -01 11 37.480081380           ~ 1 0
52 SDSS J212749.79+002607.2 * 21 27 49.7891036808 +00 26 07.188662688           ~ 1 0
53 SDSS J213112.08-002154.0 * 21 31 12.0884690712 -00 21 54.029303028           ~ 1 0
54 2MASS J21320627+0040269 LM* 21 32 06.2710985880 +00 40 26.929781940           dM6 4 0
55 SDSS J213517.94-005725.1 * 21 35 17.9484146592 -00 57 25.119965844           ~ 1 0
56 SDSS J214029.24+003320.6 * 21 40 29.2462678512 +00 33 20.732552064           ~ 1 0
57 SDSS J214124.52-002220.5 PM* 21 41 24.5175773040 -00 22 20.468703828           ~ 1 0
58 2MASS J21422615+0105425 * 21 42 26.16 +01 05 42.5           ~ 1 0
59 SDSS J214245.57-005436.7 * 21 42 45.5669268960 -00 54 36.672945948           ~ 1 0
60 SDSS J214751.69-003237.4 PM* 21 47 51.6816997200 -00 32 37.489276392           ~ 3 0
61 SDSS J215430.88+002117.1 * 21 54 30.8812596768 +00 21 17.017378992           ~ 1 0
62 SDSS J215455.17+011414.5 * 21 54 55.1849740416 +01 14 14.576700804           K5 4 0
63 UCAC4 447-133955 PM* 21 55 17.4127586904 -00 45 47.773876356   17.341 15.740 15.435   M4.5 8 0
64 SDSS J220548.89-000352.5 * 22 05 48.8954452608 -00 03 52.556360796           ~ 1 0
65 SDSS J220920.29-005738.8 * 22 09 20.2996194768 -00 57 38.863846908           M1 1 0
66 SDSS J221712.10-000815.4 * 22 17 12.1014281784 -00 08 15.400610916           ~ 1 0
67 SDSS J221726.10+003052.2 * 22 17 26.1044839608 +00 30 52.368170832           ~ 1 0
68 2MASS J22201290-0034288 * 22 20 12.9030222360 -00 34 29.020875672           ~ 2 0
69 SDSS J222552.54+000251.6 * 22 25 52.5417690000 +00 02 51.758750760           ~ 1 0
70 SDSS J223711.01+005306.5 * 22 37 11.0055720264 +00 53 06.579598848           ~ 1 0
71 SDSS J223731.35+005425.6 PM* 22 37 31.3432334304 +00 54 25.479047268           ~ 3 0
72 SDSS J225641.87+011050.9 PM* 22 56 41.8579527552 +01 10 50.808743328           ~ 2 0
73 SDSS J230001.05+010454.1 * 23 00 01.0548772800 +01 04 54.166108368           ~ 1 0
74 SDSS J230314.24-003110.7 PM* 23 03 14.2433166552 -00 31 10.584033492           ~ 1 0
75 SDSS J231109.45+002515.4 * 23 11 09.4499081592 +00 25 15.477349584           ~ 1 0
76 SDSS J231810.79-004512.3 PM* 23 18 10.7867671584 -00 45 12.326532264           ~ 1 0
77 SDSS J232516.19-001600.9 * 23 25 16.1933843496 -00 16 00.874556940           ~ 1 0
78 SDSS J233810.08-004450.3 * 23 38 10.0987101336 -00 44 50.310598488           ~ 2 0
79 SDSS J233952.93-001005.3 * 23 39 52.9312840488 -00 10 05.391339528           ~ 1 0
80 SDSS J234612.94+002507.3 * 23 46 12.9520000752 +00 25 07.278531744           K5 1 0

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