2014A&A...571A..35B


C.D.S. - SIMBAD4 rel 1.7 - 2020.05.27CEST09:30:19

2014A&A...571A..35B - Astronomy and Astrophysics, volume 571A, 35-35 (2014/11-1)

Asteroseismic stellar activity relations.

BONANNO A., CORSARO E. and KAROFF C.

Abstract (from CDS):

In asteroseismology an important diagnostic of the evolutionary status of a star is the small frequency separation which is sensitive to the gradient of the mean molecular weight in the stellar interior. It is thus interesting to discuss the classical age-activity relations in terms of this quantity. Moreover, as the photospheric magnetic field tends to suppress the amplitudes of acoustic oscillations, it is important to quantify the importance of this effect by considering various activity indicators. We propose a new class of age-activity relations that connects the Mt. Wilson S index and the average scatter in the light curve with the small frequency separation and the amplitude of the p-mode oscillations. We used a Bayesian inference to compute the posterior probability of various empirical laws for a sample of 19 solar-like active stars observed by the Kepler telescope. We demonstrate the presence of a clear correlation between the Mt. Wilson S index and the relative age of the stars as indicated by the small frequency separation, as well as an anti-correlation between the S index and the oscillation amplitudes. We argue that the average activity level of the stars shows a stronger correlation with the small frequency separation than with the absolute age that is often considered in the literature. The phenomenological laws discovered in this paper have the potential to become new important diagnostics to link stellar evolution theory with the dynamics of global magnetic fields. In particular we argue that the relation between the Mt. Wilson S index and the oscillation amplitudes is in good agreement with the findings of direct numerical simulations of magneto-convection.

Abstract Copyright:

Journal keyword(s): stars: activity - stars: oscillations - stars: chromospheres - methods: statistical

Status at CDS:  

Simbad objects: 19

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Number of rows : 19

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 173701 PM* 18 44 35.1192273920 +43 49 59.789089625   8.37 7.52     G8V 128 0
2 BD+45 2796 PM* 18 56 21.2644967292 +45 30 53.232987726   9.80 9.29     G0.5IV 66 0
3 HD 176071 PM* 18 56 22.1269692202 +45 30 25.359126300   8.81 8.33     F8IV 67 0
4 HD 176153 Ro* 18 56 36.6478619140 +47 39 23.163197712   9.20 8.68     F9IV-V 64 0
5 BD+42 3247 PM* 19 06 58.3261704119 +42 26 08.264161006   10.32 9.75     G0.5IV 54 0
6 HD 178971 Ro* 19 09 01.9440013031 +38 53 59.483977067   8.79 8.36     F5IV-V 51 0
7 HD 179260 * 19 10 11.6374335186 +38 04 55.826877281   8.94 8.49     F5IV-V 49 0
8 BD+39 3706 PM* 19 16 34.9029087477 +40 02 50.362111184       9.1   G1.5V 59 0
9 HD 234856 Ro* 19 17 45.8021284617 +50 28 48.273320177   9.87 9.32     F9IV-V 64 0
10 HD 181207 PM* 19 17 46.3566541779 +41 24 36.837551319   9.06 8.47     F9IV-V 70 0
11 BD+41 3338 * 19 24 11.1934178701 +42 03 09.726580716   9.97 9.19     G8IV-V 55 0
12 HD 183298 PM* 19 26 22.0908800928 +50 59 14.333199265   8.71 8.16     G0.5IV 75 0
13 TYC 3551-149-1 PM* 19 27 20.4902312930 +48 57 12.008653325   10.59 9.85     G5IV 42 0
14 BD+36 3570 Ro* 19 28 19.8470073047 +37 03 35.395152315   9.40 8.97     F8IV 48 0
15 TYC 3143-53-1 Ro* 19 35 03.7375425270 +42 44 16.720275774   10.31 9.85     F8IV 49 0
16 BD+44 3183 PM* 19 35 50.5740210502 +44 52 50.020113052   9.38 8.92     G0IV 45 0
17 TYC 3556-3445-1 Ro* 19 40 21.2108165107 +45 29 20.960913818   10.48 9.91     G3V 55 0
18 HD 186700 PM* 19 43 39.6224377398 +48 55 43.808257365   8.86 8.47     F5IV-V 55 0
19 HD 187160 SB* 19 46 41.3660194374 +44 20 54.685297711   7.650 7.083     F9IV-V 77 0

    Equat.    Gal    SGal    Ecl

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2020.05.27-09:30:19

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