2017A&A...598A..77K


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.08CEST04:36:14

2017A&A...598A..77K - Astronomy and Astrophysics, volume 598A, 77-77 (2017/2-1)

Stellar magnetic activity and variability of oscillation parameters: An investigation of 24 solar-like stars observed by Kepler.

KIEFER R., SCHAD A., DAVIES G. and ROTH M.

Abstract (from CDS):

Context. The Sun and solar-like stars undergo activity cycles for which the underlying mechanisms are not well understood. The oscillations of the Sun are known to vary with its activity cycle and these changes provide diagnostics on the conditions below the photosphere. Kepler has detected solar-like oscillations in hundreds of stars but as of yet, no widespread detection of signatures of magnetic activity cycles in the oscillation parameters of these stars have been reported.
Aims. We analysed the photometric short cadence Kepler time series of a set of 24 solar-like stars, which were observed for at least 960d each, with the aim to find signatures of stellar magnetic activity in the oscillation parameters.
Methods. We analyse the temporal evolution of oscillation parameters by measuring mode frequency shifts, changes in the height of the p-mode envelope, as well as granulation timescales.
Results. For 23 of the 24 investigated stars, we find significant frequency shifts in time. We present evidence for magnetic activity in six of these stars. We find that the amplitude of the frequency shifts decreases with stellar age and rotation period. For KIC 8006161 (the most prominent example), we find that frequency shifts are smallest for the lowest and largest for the highest p-mode frequencies, as they are for the Sun.
Conclusions. These findings show that magnetic activity can be routinely observed in the oscillation parameters for solar-like stars, which opens up the possibility of placing the solar activity cycle in the context of other stars by asteroseismology.

Abstract Copyright: © ESO, 2017

Journal keyword(s): asteroseismology - stars: activity - stars: oscillations - stars: solar-type - stars: magnetic field - methods: data analysis

Simbad objects: 25

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Number of rows : 25

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 HD 49933 ** 06 50 49.831 -00 32 27.18           F3V 326 1
2 BD+47 2683 * 18 43 42.4230070169 +47 56 16.007259287   9.85 9.26     G0V 54 0
3 HD 173701 PM* 18 44 35.1192273920 +43 49 59.789089625   8.37 7.52     G8V 131 0
4 BD+47 2703 PM* 18 49 33.6588767037 +47 42 39.607284250   10.16 9.54     F9IV-V 36 0
5 HD 176693 Ro* 18 59 08.6846510375 +48 25 23.598982331   9.34 8.83     F8V 96 0
6 HD 177153 PM* 19 01 39.6781881955 +41 29 24.325583971   7.76 7.21     G0 88 0
7 BD+42 3247 PM* 19 06 58.3261704119 +42 26 08.264161006   10.32 9.75     G0.5IV 55 0
8 HD 179070 Ro* 19 09 26.8351401260 +38 42 50.455094310   8.767 8.25 8.00   F6IV 134 1
9 BD+39 3706 PM* 19 16 34.9029087477 +40 02 50.362111184       9.1   G1.5V 60 0
10 HD 234856 Ro* 19 17 45.8021284617 +50 28 48.273320177   9.87 9.32     F9IV-V 65 0
11 HD 181207 PM* 19 17 46.3566541779 +41 24 36.837551319   9.06 8.47     F9IV-V 72 0
12 BD+43 3221 * 19 20 47.9394314405 +44 09 18.749657280   10.03 9.50     F9IV-V 56 0
13 BD+43 3228 PM* 19 23 56.4114026497 +43 18 52.534860977   10.84 10.15     G0V 47 0
14 BD+48 2893 * 19 24 07.7660110490 +49 02 24.928201112   10.73 10.08     ~ 95 1
15 BD+41 3338 * 19 24 11.1934178701 +42 03 09.726580716   9.97 9.19     G8IV-V 57 0
16 HD 182756 * 19 24 30.3488994710 +40 19 23.671169678   9.01 8.31     G1V 52 0
17 HD 183298 PM* 19 26 22.0908800928 +50 59 14.333199265   8.71 8.16     G0.5IV 76 0
18 TYC 3551-149-1 PM* 19 27 20.4902312930 +48 57 12.008653325   10.59 9.85     G5IV 43 0
19 HD 184401 PM* 19 32 14.5965136348 +45 18 38.296572485   9.63 8.95     G5 38 0
20 BD+46 2726 * 19 34 43.0023412508 +46 51 09.934561072   10.36 9.64     K0V 93 0
21 TYC 3135-624-1 PM* 19 36 48.8136899967 +38 42 56.787490867   10.35 9.55     G5IV 59 0
22 BD+44 3197 PM* 19 37 54.5253612516 +44 59 04.628808348       9.3   G0IV 58 0
23 HD 185834 * 19 39 00.6725787612 +46 54 06.983774230   9.26 8.78     F6IV 31 0
24 HD 187160 SB* 19 46 41.3660194374 +44 20 54.685297711   7.650 7.083     F9IV-V 77 0
25 BD+43 3368 * 19 48 14.2913903442 +43 44 48.960378018   9.63 9.17     F8V 32 0

    Equat.    Gal    SGal    Ecl

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2020.07.08-04:36:14

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