2007ApJS..173..673W

Query : 2007ApJS..173..673W

2007ApJS..173..673W - Astrophys. J., Suppl. Ser., 173, 673-681 (2007/December-0)

The detection of M dwarf UV flare events in the GALEX data archives.

WELSH B.Y., WHEATLEY J.M., SEIBERT M., BROWNE S.E., WEST A.A., SIEGMUND O.H.W., BARLOW T.A., FORSTER K., FRIEDMAN P.G., MARTIN D.C., MORRISSEY P., SMALL T., WYDER T., SCHIMINOVICH D., NEFF S. and RICH R.M.

Abstract (from CDS):

We present the preliminary results from implementing a new software tool that enables inspection of time-tagged photon data for the astronomical sources contained within individual GALEX ultraviolet (UV) images of the sky. We have inspected the photon data contained within 1802 GALEX images to reveal rapid, short-term (≲500 s) UV source variability in the form of stellar ``flares.'' The mean associated change in near-UV (NUV) magnitude due to this flaring activity is 2.7±0.3 mag. A list of 49 new UV variable star candidates is presented, together with their associated Sloan Digital Sky Survey (SDSS) photometric magnitudes. From these data we can associate the main source of these UV flare events with magnetic activity on M dwarf stars. Photometric parallaxes have been determined for 32 of these sources, placing them at distances ranging from approximately 25 to 1000 pc. The average UV flare energy for these flare events is 2.5x1030 ergs, which is of a similar energy to that of U-band, X-ray, and EUV flares observed on many local M dwarf stars. We have found that stars of classes M0 to M5 flare with energies spanning a far larger range and with an energy approximately 5 times greater than those of later (M6 to M8) spectral type.

Abstract Copyright: ∼

Journal keyword(s): Stars: Variables: Other - Ultraviolet: Stars

VizieR on-line data: <Available at CDS (J/ApJS/173/673): table1.dat table2.dat>

Simbad objects: 54

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Number of rows : 54
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 G 272-61B PM* 01 39 01.6377185550 -17 57 01.001240728           M6V 892 0
2 SDSS J023955.52-072855.4 * 02 39 55.5327732432 -07 28 55.485273612           ~ 2 0
3 SDSS J034358.01-053526.5 * 03 43 58.0141667784 -05 35 26.587559652           ~ 1 0
4 V* YZ CMa cC* 07 00 53.2124971248 -19 27 33.483634092           ~ 21 0
5 SDSS J085939.62+565459.5 PM* 08 59 39.6258656448 +56 54 59.566548096           ~ 4 0
6 SDSS J090350.46+522124.9 * 09 03 50.4634304880 +52 21 25.035183720           ~ 1 0
7 2MASS J09080832-0046094 * 09 08 08.3352875040 -00 46 09.402241944           ~ 4 0
8 SDSS J091608.29+460724.7 PM* 09 16 08.2725975168 +46 07 24.708609984           ~ 3 0
9 SDSS J094659.05+613146.2 * 09 46 59.0459885856 +61 31 46.289022744           ~ 1 0
10 2MASS J09575883+0205036 * 09 57 58.8276847704 +02 05 03.607065564   19.674 18.468   16.340 ~ 11 0
11 2MASS J10014160+0207588 * 10 01 41.6084635896 +02 07 58.769236812           M3e 12 0
12 2MASS J10020785+0222347 PM* 10 02 07.8656245224 +02 22 34.693262544           ~ 13 0
13 2MASS J10020956+0207262 * 10 02 09.5548364928 +02 07 26.202942480   22.011 20.819     ~ 2 0
14 2MASS J10025542+0211593 * 10 02 55.4352268056 +02 11 59.614780272   21.352 20.281     ~ 3 0
15 2MASS J10115229+6144542 * 10 11 52.29 +61 44 54.2           ~ 1 0
16 SDSS J101326.83+342309.8 * 10 13 26.8475237880 +34 23 09.855074076           ~ 1 0
17 V* AD Leo PM* 10 19 36.2808181226 +19 52 12.010446571   10.82 9.52 9.19   dM3 1469 1
18 2MASS J10225338+6119174 * 10 22 53.38 +61 19 17.4           ~ 1 0
19 SDSS J104811.85+644328.2 PM* 10 48 11.8581023424 +64 43 28.263020520           ~ 2 0
20 G 10-49 PM* 11 47 40.7472267384 +00 15 20.101843571   14.94 13.34 13.35 10.506 M4V 100 0
21 SDSS J114939.31+003510.3 PM* 11 49 39.3736528284 +00 35 10.337437447           ~ 2 0
22 SIPS J1157-0040 Em* 11 57 56.6723491824 -00 40 04.739332440           ~ 7 0
23 ATO J187.1240+12.3755 RS* 12 28 29.7973615776 +12 22 31.950801012           ~ 4 0
24 SDSS J123512.63+621745.1 * 12 35 12.6375901128 +62 17 45.096934776           ~ 2 0
25 NAME Hubble Deep Field reg 12 36 49.5 +62 12 58           ~ 1967 1
26 SDSS J124004.84+622309.2 * 12 40 04.8238210344 +62 23 09.206006676           ~ 1 0
27 SDSS J131843.61+661914.1 * 13 18 43.6251927552 +66 19 14.246273244           ~ 1 0
28 SDSS J132537.62-024540.9 PM* 13 25 37.6224598224 -02 45 40.864341024           ~ 1 0
29 2MASS J14194634+5259424 * 14 19 46.3482380976 +52 59 42.539141076       15.15   ~ 8 0
30 SDSS J142010.42+522157.7 PM* 14 20 10.4484320880 +52 21 57.604948596           ~ 2 0
31 SDSS J142551.18+042948.7 * 14 25 51.1739871576 +04 29 48.758846316           ~ 2 0
32 NAME Proxima Centauri PM* 14 29 42.9461331854 -62 40 46.164680672 14.21 12.95 11.13 9.45 7.41 M5.5Ve 1483 0
33 SDSS J144738.47+035312.1 PM* 14 47 38.4663658584 +03 53 12.160188528           ~ 4 0
34 SDSS J144815.37+032223.3 PM* 14 48 15.3660295176 +03 22 23.482720920           ~ 2 0
35 G 166-49 PM* 14 51 10.3962536811 +31 06 40.320450024   14.24 12.52 12.29 9.78 M4.0Ve 45 1
36 NGC 6090 PaG 16 11 40.3 +52 27 21   14.0       ~ 446 1
37 ATO J243.0759+52.7070 PM* 16 12 18.3555326352 +52 42 25.190176752   13.90   12.85 11.43 ~ 5 0
38 2MASS J16474190+3457331 PM* 16 47 41.9128066104 +34 57 33.213458196           ~ 4 0
39 2MASS J16485854+3448394 * 16 48 58.5474199752 +34 48 39.410725284   15.25   13.92 13.40 ~ 2 0
40 2MASS J16523925+3457455 * 16 52 39.2441935896 +34 57 45.371306916           ~ 3 0
41 SDSS J171316.24+601121.1 * 17 13 16.2383344944 +60 11 21.161197680           ~ 1 0
42 2MASS J17174656+5941240 * 17 17 46.5743420544 +59 41 24.115717068   15.10   13.29 11.44 ~ 7 0
43 [BFO2002] Dra 30394 * 17 21 13.5113985216 +58 06 09.701936892     19.358   16.607 ~ 3 0
44 2MASS J20384965-0111399 * 20 38 49.6533923712 -01 11 40.008447708           ~ 1 0
45 2MASS J20463188+0024525 * 20 46 31.8875678856 +00 24 52.497393948           ~ 1 0
46 PM J21188+0018 ** 21 18 48.0717 +00 18 50.033     13.238 12.959   ~ 6 0
47 UCAC4 414-141282 * 22 02 17.0776123080 -07 22 43.449105576           ~ 2 0
48 StKM 1-2018 ** 22 33 22.6593 -09 36 53.737   13.98 12.41 12.10 10.07 M3V 49 0
49 2MASS J22414562-0105391 PM* 22 41 45.6346033440 -01 05 39.080124384           ~ 1 0
50 UCAC4 407-137995 * 22 52 16.3124307528 -08 42 40.571274600           ~ 3 0
51 SDSS J230217.85+132750.1 PM* 23 02 17.8528714056 +13 27 50.154775380           ~ 4 0
52 2MASS J23091388+0018525 * 23 09 13.8956024712 +00 18 52.230944340           ~ 1 0
53 2MASS J23230111-0001180 * 23 23 01.1177826984 -00 01 18.050654856           ~ 1 0
54 RX J2353.3+1503 ** 23 53 17.659992 +15 03 01.61532   11.634 10.905 10.773   ~ 4 0

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