J/A+A/634/L9 Rotation periods of 97 solar-like stars (Witzke+, 2020)
Effect of metallicity on the detectability of rotational periods in
solar-like stars.
Witzke V., Reinhold T., Shapiro A.I., Krivova N.A., Solanki S.K.
<Astron. Astrophys., 634, L9 (2020)>
=2020A&A...634L...9W 2020A&A...634L...9W (SIMBAD/NED BibCode)
ADC_Keywords: Stars, G-type ; Abundances ; Rotational velocities ;
Effective temperatures ; Photometry ; Optical
Keywords: stars: variables: general - stars: rotation -
stars: fundamental parameters - stars: solar-type
Abstract:
The accurate determination of stellar rotation periods is important
for estimating stellar ages and for understanding stellar activity and
evolution. While rotation periods can be determined for about thirty
thousand stars in the Kepler field, there are over one hundred
thousand stars, especially with low photometric variability and
irregular pattern of variations, for which rotational periods are
unknown. Here we investigate the effect of metallicity on the
detectability of rotation periods. This is done by synthesising light
curves of hypothetical stars that are identical to our Sun with the
exception of the metallicity. These light curves are then used as an
input to the period determination algorithms. We find that the success
rate for recovering the rotation signal has a minimum close to the
solar metallicity value. This can be explained by the compensation
effect of facular and spot contributions. In addition, selecting
solar-like stars with near-solar effective temperature and photometric
variability, and with metallicity between M/H=-0.35 and M/H=0.35 from
the Kepler sample, we analyse the fraction of stars for which
rotational periods have been detected as a function of metallicity. In
agreement with our theoretical estimate we find a local minimum for
the detection fraction close to the solar metallicity. We further
report rotation periods of 87 solar-like Kepler stars for the first
time.
Description:
The Kepler field of view was selected in order to contain a large
fraction of solar-like stars. Focusing on stars in the effective
temperature range of 5600K-5900K, it is challenging to determine
their rotational periods.
Stellar fundamental parameters and rotation periods of the 97 periodic
stars are presented.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tablea1.dat 48 97 Stellar fundamental parameters and rotation
periods of the 97 periodic stars in our sample
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See also:
V/133 : Kepler Input Catalog (Kepler Mission Team, 2009)
Byte-by-byte Description of file: tablea1.dat
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Bytes Format Units Label Explanations
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1 A1 --- Note [N] N for New periods
3- 10 I8 --- KIC KIC number
12- 15 I4 K Teff Effective temperature
17- 20 F4.2 [cm/s2] logg Surface gravity
22- 26 F5.2 [-] [M/H] Metallicity
28- 32 F5.2 d Prot Rotational velocity
34- 37 F4.2 % Rvar Variability range
39- 43 F5.2 mag Kpmag Apparent Kepler magnitude
45- 48 F4.2 mag GMAG Absolute Gaia magnitude
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 01-May-2020