2017MNRAS.466.3060P


C.D.S. - SIMBAD4 rel 1.7 - 2019.10.18CEST12:18:40

2017MNRAS.466.3060P - Mon. Not. R. Astron. Soc., 466, 3060-3076 (2017/April-2)

Do A-type stars flare?

PEDERSEN M.G., ANTOCI V., KORHONEN H., WHITE T.R., JESSEN-HANSEN J., LEHTINEN J., NIKBAKHSH S. and VIUHO J.

Abstract (from CDS):

For flares to be generated, stars have to have a sufficiently deep outer convection zone (F5 and later), strong large-scale magnetic fields (Ap/Bp-type stars) or strong, radiatively driven winds (B5 and earlier). Normal A-type stars possess none of these and therefore should not flare. Nevertheless, flares have previously been detected in the Kepler light curves of 33 A-type stars and interpreted to be intrinsic to the stars. Here, we present new and detailed analyses of these 33 stars, imposing very strict criteria for the flare detection. We confirm the presence of flare-like features in 27 of the 33 A-type stars. A study of the pixel data and the surrounding field of view reveals that 14 of these 27 flaring objects have overlapping neighbouring stars and five stars show clear contamination in the pixel data. We have obtained high-resolution spectra for 2/3 of the entire sample and confirm that our targets are indeed A-type stars. Detailed analyses revealed that 11 out of 19 stars with multiple epochs of observations are spectroscopic binaries. Furthermore, and contrary to previous studies, we find that the flares can originate from a cooler, unresolved companion. We note the presence of Hα emission in eight stars. Whether this emission is circumstellar or magnetic in origin is unknown. In summary, we find possible alternative explanations for the observed flares for at least 19 of the 33 A-type stars, but find no truly convincing target to support the hypothesis of flaring A-type stars.

Abstract Copyright: © 2016 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): stars: activity - binaries: spectroscopic - circumstellar matter - stars: flare - stars: magnetic field - stars: magnetic field

Simbad objects: 45

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Number of rows : 45

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2019
#notes
1 * lam Eri Be* 05 09 08.7831482 -08 45 14.690823 3.17 4.07 4.27 4.35 4.55 B2III(e)p 281 1
2 V* IQ Aur a2* 05 19 00.0284977265 +33 44 54.237390018   5.201 5.371     A0p 269 0
3 * tet02 Ori A SB* 05 35 22.9022511214 -05 24 57.817182421 5.37 6.30 6.39 6.30 6.35 O9.5IVp 487 0
4 * sig Ori E Y*O 05 38 47.2050001416 -02 35 40.514907495 5.66 6.38 6.46 6.84 7.08 B2IV-Vp_He 392 0
5 * bet Pic PM* 05 47 17.0876901 -51 03 59.441135 4.13 4.03 3.86 3.74 3.58 A6V 1597 1
6 * alf CMa SB* 06 45 08.91728 -16 42 58.0171 -1.51 -1.46 -1.46 -1.46 -1.43 A1V+DA 1373 0
7 * eta Car Em* 10 45 03.5455050 -59 41 03.951060 6.37 7.034 6.21 4.90 4.41 OBepec 2148 0
8 EM* MWC 297 Ae* 18 27 39.5266257570 -03 49 52.136526892 15.57 14.34 12.31 11.34   B1.5Ve 260 0
9 * alf Lyr dS* 18 36 56.33635 +38 47 01.2802 0.03 0.03 0.03 0.07 0.10 A0Va 2472 0
10 TYC 3127-1423-1 SB* 18 57 32.9572 +42 41 47.961   11.64 11.78     B9.5Vn 7 0
11 HD 176708 Ro* 18 59 00.9222735454 +49 19 09.893266112   7.54 7.46     A2V 7 0
12 HD 177152 Ro* 19 01 21.7811373364 +44 23 11.466040424   7.54 7.57     B9V 23 0
13 HD 177828 Ro* 19 03 46.7427143314 +49 37 58.519594232   7.68 7.53     A8V 4 0
14 KIC 7809801 * 19 07 37.8053282473 +43 33 40.691331707           ~ 2 0
15 KIC 11236035 Ro* 19 10 03.5013530184 +48 56 04.626046868           ~ 8 0
16 TYC 3547-2631-1 SB* 19 19 05.0178313513 +48 27 52.494430048   11.52 11.37     A5V 6 0
17 TYC 3125-99-1 Ro* 19 19 53.4930941600 +41 09 12.163862975   10.11 9.86     A7V 6 0
18 TYC 3146-445-1 Ro* 19 23 35.6827927301 +44 52 51.563508963   10.84 10.70     A3V 4 0
19 HD 182828 SB* 19 24 09.8970704303 +48 25 40.664788760   8.33 8.30     A0V 9 0
20 TYC 3543-2942-1 gD* 19 24 20.8695049105 +45 39 16.678876148   12.24 12.07     A4V 11 0
21 HD 183254 SB* 19 26 09.4485799597 +50 34 23.796931455   8.51 8.45     A1V 8 0
22 HD 183257 SB* 19 26 28.3856561051 +48 52 15.011303219   8.17 8.15     A1Va+n 13 0
23 HD 184023 Ro* 19 30 29.0595244267 +44 20 40.908074295   8.66 8.56     A2IVn 8 0
24 KIC 4472809 Ro* 19 35 32.1180295963 +39 33 39.294357894           ~ 6 0
25 KIC 6451234 * 19 37 47.6017961808 +41 48 22.142860569           A2III-IV 4 0
26 KIC 10082844 Ro* 19 39 12.5785070076 +47 01 08.512812130           B9.5Vn 10 0
27 HD 225447 gD* 19 42 12.6337395174 +40 17 45.924927600   9.286 9.173     A3IV-V 22 0
28 KIC 7047141 Ro* 19 42 18.3317388883 +42 31 14.939512294           A0Ve 3 0
29 HD 225493 SB* 19 42 54.5715331877 +40 21 18.153256572   9.61 9.40     A4V 9 0
30 TYC 3144-1309-1 Ro* 19 43 54.7857348093 +41 30 11.293853268   12.38 11.93     B9.5Vn 8 0
31 HD 225660 Ro* 19 45 17.9917791805 +39 03 00.215943418   11.71 11.39     A2Ve 7 0
32 HD 187119 Ro* 19 46 10.3295411527 +46 31 52.283179509   9.43 9.37     B3V 6 0
33 HD 187139 SB* 19 46 36.5693429474 +43 45 48.189651741   8.16 8.16     B8V 21 0
34 HD 187254 SB* 19 47 11.4302695599 +44 50 53.620469186   8.94 8.71     kA5hA5mF2V 23 0
35 KIC 8044889 EB* 19 47 56.4502016878 +43 48 13.072759988           A5V 7 0
36 KIC 9603367 Ro* 19 49 25.5582712975 +46 14 27.679925405           ~ 8 0
37 TYC 3149-1793-1 Ro* 19 50 17.9647401086 +43 45 03.529081634   12.42 12.73     A1V 4 0
38 KIC 5898780 dS* 19 50 42.5871140203 +41 06 06.995445141           A7Ve 4 0
39 TYC 3141-1203-1 Ro* 19 51 54.6845930778 +39 51 33.586972033   11.79 11.58     A2Ve 4 0
40 2MASS J19523118+4023594 EB* 19 52 31.1799831954 +40 23 59.477916003           A1V 8 0
41 HD 188283 SB* 19 52 45.7696 +40 44 51.974   8.72 8.75     B9IV 10 0
42 KIC 10489286 Ro* 19 53 07.9446165518 +47 41 48.858060876           A9V 5 0
43 KIC 10817620 Ro* 19 54 50.7345701772 +48 08 04.117868919           ~ 7 0
44 HD 188774 dS* 19 55 10.0376514155 +41 17 10.270913232   9.05 8.81     A7.5IV-III4A8IIIs 24 0
45 * alf PsA ** 22 57 39.04625 -29 37 20.0533 1.31 1.25 1.16 1.11 1.09 A4V 1099 3

    Equat.    Gal    SGal    Ecl

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2019.10.18-12:18:40

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