2011AJ....141...33D


C.D.S. - SIMBAD4 rel 1.7 - 2020.01.29CET06:10:45

2011AJ....141...33D - Astron. J., 141, 33 (2011/February-0)

Saturation levels for white-light flares of flare stars: variation of minimum flare duration for saturation.

DAL H.A. and EVREN S.

Abstract (from CDS):

Taking into account results obtained from models and from statistical analyses of obtained parameters, we discuss flare activity levels and flare characteristics of five UV Ceti stars. We present the parameters of unpublished flares detected over two years of observations of V1005 Ori. We compare parameters of the U-band flares detected over several seasons of observations of AD Leo, EV Lac, EQ Peg, V1054 Oph, and V1005 Ori. Flare frequencies calculated for all program stars and maximum energy levels of the flares are compared, and we consider which is the most correct parameter as an indicator of flare activity levels. Using the One Phase Exponential Association function, the distributions of flare equivalent duration versus flare total duration are modeled for each program star. We use the Independent Samples t-Test in the statistical analyses of the parameters obtained from the models. The results reveal some properties of flare processes occurring on the surfaces of UV Ceti type stars. (1) Flare energies cannot be higher than a specific value regardless of the length of the flare total duration. This must be a saturation level for white-light flares occurring in flare processes observed in the U band. Thus, for the first time it is shown that white-light flares have a saturation in a specific energy range. (2) The span values, which are the difference between the equivalent durations of flares with the shortest and longest total durations, are almost equal for each star. (3) The half-life values, minimum flare durations for saturation, increase toward the later spectral types. (4) Both maximum total durations and maximum rise times computed from the observed flares decrease toward the later spectral types among the UV Ceti stars. According to the maximum energy levels obtained from the models, both EV Lac and EQ Peg are more active than the other three program stars, while AD Leo is the most active flare star according to the flare frequencies.

Abstract Copyright:

Journal keyword(s): methods: data analysis - methods: statistical - stars: flare - stars: individual (V1005 Ori, AD Leo, V1054 Oph, EV Lac, EQ Peg)

Simbad objects: 23

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Number of rows : 23

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 G 272-61B Fl* 01 39 01.6334059022 -17 57 01.121866655     13.2     M6V 783 0
2 Cl Melotte 22 OpC 03 47 00 +24 07.0           ~ 2929 0
3 HD 31452 PM* 04 56 10.6943880053 +02 56 03.040237515   9.28   7.8   G8/K0IV 50 0
4 BD+01 870 * 04 58 19.3945998575 +01 36 05.902530740   10.52 9.417 8.935 9.148 K5 4 0
5 V* V1005 Ori BY* 04 59 34.8341800543 +01 47 00.672080375   11.48 10.107 9.603 8.239 M0Ve 297 0
6 NAME Orion Nebula Cluster OpC 05 35.0 -05 29           ~ 1924 1
7 V* YZ CMi BY* 07 44 40.1726285952 +03 33 08.877830321 13.761 12.831 11.225 9.958 8.263 M4.0Ve 775 0
8 IC 2391 OpC 08 40 32 -53 02.0           ~ 709 0
9 BD+20 2465 ** 10 19 36.2808024653 +19 52 12.014037746   10.82 9.52 9.19   M4Vae 1126 0
10 HD 89471 * 10 19 53.9416912573 +20 24 15.279928502   9.085 7.726 7.0   K8 17 0
11 HD 89772 * 10 21 55.5172944174 +20 03 12.964567916   10.20 8.95 8.4   K6-K7 17 0
12 NAME Ursa Major Moving Group MGr 12 32 +57.0           ~ 373 2
13 HD 152678 * 16 55 10.7743803005 -08 22 06.906168315   9.537 7.994     K2III 9 0
14 Wolf 629 PM* 16 55 25.2215746210 -08 19 21.301127712 14.691 13.436 11.759 10.574 9.044 M3.5V 186 0
15 HD 152751 SB* 16 55 28.75758 -08 20 10.7876 11.647 10.593 9.023 7.937 6.565 M3.5Ve 481 1
16 BD-08 4357 * 16 56 16.5220984526 -08 32 37.257109338   10.74 10.00     K0 4 0
17 HD 215488 * 22 44 46.4007700299 +44 21 59.129591492   10.92 10.013     K1-K2 11 0
18 HD 215576 * 22 45 33.5467327330 +44 21 22.311734549   10.328 9.216     G7III/IV 27 0
19 V* EV Lac Fl* 22 46 49.7311740821 +44 20 02.372223230   11.85 10.26 9.89   M4.0V 786 2
20 BD+19 5115 * 23 30 55.2252611782 +20 34 53.953904720   10.10 9.02     K3-K4 5 0
21 BD+19 5116 ** 23 31 52.17898 +19 56 14.1505 12.737 11.749 10.165 8.982 7.446 M4+M5 416 0
22 CCDM J23322+1942AB ** 23 32 12.5094383322 +19 42 17.574763944   10.138 9.546     G8 14 0
23 NAME Castor Moving Group As* ~ ~           ~ 114 1

    Equat.    Gal    SGal    Ecl

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2020.01.29-06:10:45

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