2019MNRAS.485.5096K


Query : 2019MNRAS.485.5096K

2019MNRAS.485.5096K - Mon. Not. R. Astron. Soc., 485, 5096-5104 (2019/June-1)

Sounding stellar cycles with Kepler - III. Comparative analysis of chromospheric, photometric, and asteroseismic variability.

KAROFF C., METCALFE T.S., MONTET B.T., JANNSEN N.E., SANTOS A.R.G., NIELSEN M.B. and CHAPLIN W.J.

Abstract (from CDS):

By combining ground-based spectrographic observations of variability in the chromospheric emission from Sun-like stars with the variability seen in their eigenmode frequencies, it is possible to relate the changes observed at the surfaces of these stars to the changes taking place in the interior. By further comparing this variability to changes in the relative flux from the stars, one can obtain an expression for how these activity indicators relate to the energy output from the stars. Such studies become very pertinent when the variability can be related to stellar cycles as they can then be used to improve our understanding of the solar cycle and its effect on the energy output from the Sun. Here, we present observations of chromospheric emission in 20 Sun-like stars obtained over the course of the nominal 4 yr Kepler mission. Even though 4 yr is too short to detect stellar equivalents of the 11 yr solar cycle, observations from the Kepler mission can still be used to analyse the variability of the different activity indicators thereby obtaining information of the physical mechanism generating the variability. The analysis reveals no strong correlation between the different activity indicators, except in very few cases. We suggest that this is due to the sparse sampling of our ground-based observations on the one hand and that we are likely not tracing cyclic variability on the other hand. We also discuss how to improve the situation.

Abstract Copyright: © 2019 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): Sun: activity - Sun: helioseismology - stars: activity - stars: oscillations

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 - 2022
#notes
1 HD 78366 PM* 09 08 51.0703818408 +33 52 55.986351384   6.53   5.6   G0IV-V 232 0
2 * bet Com PM* 13 11 52.3938268062 +27 52 41.462309460 4.92 4.84 4.25 3.77 3.47 F9.5V 871 0
3 HD 173701 PM* 18 44 35.1191008536 +43 49 59.790008892   8.37 7.52     G8V 150 0
4 BD+45 2796 PM* 18 56 21.2642726544 +45 30 53.234154468   9.80 9.29     G0.5IV 79 0
5 HD 176071 Er* 18 56 22.1268370056 +45 30 25.361404632   8.81 8.33     F8IV 77 0
6 HD 176153 Ro* 18 56 36.6514583496 +47 39 23.133492756   9.20 8.68     F9IV-V 71 0
7 HD 176465 ** 18 58 03.46393 +47 11 30.6471       8.462   G4V 51 0
8 BD+42 3247 PM* 19 06 58.3280630808 +42 26 08.260897020   10.32 9.75     G0.5IV 59 0
9 HD 178971 Ro* 19 09 01.9438328856 +38 53 59.485809012   8.79 8.36     F5IV-V 60 0
10 HD 179260 * 19 10 11.6372611944 +38 04 55.831675296   8.94 8.49     F5IV-V 55 0
11 BD+39 3706 PM* 19 16 34.9026130056 +40 02 50.359631244       9.1   G1.5V 68 0
12 HD 234856 Ro* 19 17 45.8018919144 +50 28 48.274775580   9.87 9.32     F9IV-V 71 0
13 HD 181207 PM* 19 17 46.3565007888 +41 24 36.838219932   9.06 8.47     F9IV-V 77 0
14 BD+41 3338 * 19 24 11.1933479232 +42 03 09.726975180   9.97 9.19     G8IV-V 63 0
15 HD 183298 PM* 19 26 22.0906256352 +50 59 14.334181836   8.71 8.16     G0.5IV 89 0
16 TYC 3551-149-1 PM* 19 27 20.4900952416 +48 57 12.010523580   10.59 9.85     G5IV 48 0
17 BD+36 3570 Ro* 19 28 19.8441075024 +37 03 35.403120000   9.40 8.97     F8IV 53 0
18 TYC 3143-53-1 Ro* 19 35 03.7372740120 +42 44 16.724850540   10.31 9.85     F8IV 55 0
19 BD+44 3183 PM* 19 35 50.5739000112 +44 52 50.022974316   9.38 8.92     G0IV 52 0
20 TYC 3556-3445-1 PM* 19 40 21.2108930904 +45 29 20.963746392   10.48 9.91     G3V 62 0
21 HD 186700 PM* 19 43 39.6223173216 +48 55 43.808906244   8.86 8.47     F5IV-V 62 0
22 HD 187160 SB* 19 46 41.3411982432 +44 20 54.601189476   7.650 7.083     F9IV-V 88 0
23 * 15 Sge PM* 20 04 06.2207683221 +17 04 12.676556401   6.390 5.788 5.4   G0V 360 0

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2022.07.06-09:20:00

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