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J/ApJ/834/207  Periodicity & magnitude of Kepler LCs variation  (Mehrabi+, 2017)

Magnetic activity analysis for a sample of G-type main sequence Kepler targets. Mehrabi A., He H., Khosroshahi H. <Astrophys. J., 834, 207-207 (2017)> =2017ApJ...834..207M (SIMBAD/NED BibCode)
ADC_Keywords: Stars, G-type ; Photometry ; Magnetic fields ; Stars, masses ; Stars, diameters Keywords: stars: activity; stars: magnetic field; stars: rotation; stars: solar-type Abstract: The variation of a stellar light curve owing to rotational modulation by magnetic features (starspots and faculae) on the star's surface can be used to investigate the magnetic properties of the host star. In this paper, we use the periodicity and magnitude of the light-curve variation as two proxies to study the stellar magnetic properties for a large sample of G-type main sequence Kepler targets, for which the rotation periods were recently determined. By analyzing the correlation between the two magnetic proxies, it is found that: (1) the two proxies are positively correlated for most of the stars in our sample, and the percentages of negative, zero, and positive correlations are 4.27%, 6.81%, and 88.91%, respectively; (2) negative correlation stars cannot have a large magnitude of light-curve variation; and (3) with the increase of rotation period, the relative number of positive correlation stars decreases and the negative correlation one increases. These results indicate that stars with shorter rotation period tend to have positive correlation between the two proxies, and a good portion of the positive correlation stars have a larger magnitude of light-curve variation (and hence more intense magnetic activities) than negative correlation stars. Description: The light-curve data of Kepler are divided into 18 quarters (Q0-Q17; 2009-2013). Each quarter (except Q0, Q1, and Q17) contains about three months of continuous data. We process the light-curve data of each quarter separately. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 58 4094 The correlation, mean values of iAC, mean value of Reff, period, mass, radius, and effective temperature of the Kepler stars
See also: V/133 : Kepler Input Catalog (Kepler Mission Team, 2009) J/AJ/130/873 : Properties of BQS objects in the SDSS DR3 area (Jester+, 2005) J/AJ/142/112 : KIC photometric calibration (Brown+, 2011) J/A+A/529/A89 : Kepler satellite variability study (Debosscher+, 2011) J/AJ/141/50 : White-light flares on cool stars from Kepler (Walkowicz+, 2011) J/ApJS/199/30 : Effective temperature scale for KIC stars (Pinsonneault+, 2012) J/other/Nat/485.478 : Superflares on solar-type stars (Maehara+, 2012) J/MNRAS/432/1203 : Rotation periods of M-dwarf stars (McQuillan+, 2013) J/A+A/557/L10 : Rotation periods of 12000 Kepler stars (Nielsen+, 2013) J/A+A/560/A4 : Rotation periods of active Kepler stars (Reinhold+, 2013) J/ApJS/209/5 : Superflares of Kepler stars. I. (Shibayama+, 2013) J/ApJ/781/124 : Granulation model for 508 KIC stars (Cranmer+, 2014) J/ApJS/211/2 : Revised properties of Q1-16 Kepler targets (Huber+, 2014) J/ApJS/211/24 : Rotation periods of Kepler MS stars (McQuillan+, 2014) J/MNRAS/447/2714 : Flare stars across the H-R diagram (Balona+, 2015) J/ApJ/829/23 : Stellar flares from Q0-Q17 Kepler LCs (Davenport, 2016) J/ApJS/229/30 : Revised properties of Q1-17 Kepler targets (Mathur+, 2017) : MAST Kepler access Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 8 I8 --- KIC Unique Kepler ID 10- 17 F8.5 --- Cor Correlation between two magnetic proxies 19- 25 F7.5 --- iAC [0.05/0.5] Mean value of degree of periodicity; see equation 2 (iAC) 27- 33 F7.5 --- Reff [/0.3] Mean value of fluctuation amplitude; see equation 4 (Reff) 35- 40 F6.3 d Per [4.5/30] The rotation period (1) 42- 47 F6.4 Msun Mass [0.8/1.3] The mass of star (1) 49- 53 F5.3 Rsun Rad [0.6/3.4] The radius of star (2) 55- 58 I4 K Teff [5310/6680] The effective surface temperature (2)
Note (1): The rotation period and mass values of the stars are taken from the catalog of McQuillan+ (2014, J/ApJS/211/24). Note (2): Effective temperature (Teff) and radius are obtained from the Kepler Input Catalog (KIC) (Brown+ 2011, J/AJ/142/112).
History: From electronic version of the journal
(End) Prepared by [ADS], Emmanuelle Perret [CDS] 31-Jul-2017
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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