Magnetic activity analysis for a sample of G-type main sequence \emph{Kepler} targets

Abstract

The variation of a stellar light curve owing to the rotational modulation by the 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, suggested by (He et al. 2015), to study the stellar magnetic properties for a large sample of G-type main sequence \emph{Kepler} targets, for which the rotation periods recently determined by (McQuillan et al. 2014). 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 correlation are $4.27\%$, $6.81\%$, and $88.91\%$, respectively; (2) Negative correlation stars cannot have large magnitude of light-curve variation; (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 the stars with shorter rotation period tend to have positive correlation between the two proxies, and a good portion of the positive correlation stars have larger magnitude of light-curve variation (and hence more intense magnetic activities) than the negative correlation stars.

arXiv commentAccepted for publication in ApJ

References in corpus (25)

• Kepler Mission Design, Realized Photometric Performance, and Early Science
• Kepler Presearch Data Conditioning II - A Bayesian Approach to Systematic Error Correction
• Kepler Input Catalog: Photometric Calibration and Stellar Classification
• Kepler Presearch Data Conditioning I - Architecture and Algorithms for Error Correction in Kepler Light Curves
• Rotation Periods of 34,030 Kepler Main-Sequence Stars: The Full Autocorrelation Sample
• The SDSS View of the Palomar-Green Bright Quasar Survey
• Superflares on Solar Type Stars Observed with Kepler I. Statistical Properties of Superflares
• Measuring the rotation period distribution of field M-dwarfs with Kepler
• Rotation and differential rotation of active Kepler stars
• Initial Characteristics of Kepler Long Cadence Data For Detecting Transiting Planets
• The Kepler Catalog of Stellar Flares
• The solar magnetic field
• The connection between stellar granulation and oscillation as seen by the Kepler mission
• CoRoT reveals a magnetic activity cycle in a Sun-like star
• Rotation periods of 12 000 main-sequence Kepler stars: Dependence on stellar spectral type and comparison with v sin i observations
• Photometric Variability in Kepler Target Stars. II. An Overview of Amplitude, Periodicity, and Rotation in First Quarter Data
• Observations of Cool-Star Magnetic Fields
• Superflares on Solar-Type Stars Observed with Kepler II. Photometric Variability of Superflare-Generating Stars : A Signature of Stellar Rotation and Starspots
• White-light flares on cool stars in the Kepler Quarter 1 Data
• Evidence for the impact of stellar activity on the detectability of solar-like oscillations observed by Kepler
• Kepler Science Operations
• Photometric Variability in Kepler Target Stars. III. Comparison with the Sun on Different Timescales
• Global stellar variability study in the field-of-view of the Kepler satellite
• Stellar Granulation as the Source of High-Frequency Flicker in Kepler Light Curves
• Activity Analyses for Solar-Type Stars Observed With Kepler. I. Proxies of Magnetic Activity

Cited by in corpus (10)

• Magnetic Activity of F-, G-, and K-type Stars in the LAMOST-Kepler Field
• Activity Analyses for Solar-type Stars Observed with Kepler. II. Magnetic Feature Versus Flare Activity
• Characteristic time of stellar flares on Sun-like stars
• Stellar Chromospheric Activity Database of Solar-like Stars Based on the LAMOST Low-Resolution Spectroscopic Survey
• Sounding stellar cycles with Kepler - III. Comparative analysis of chromospheric, photometric and asteroseismic variability
• $\mathrm{H}\alpha$ chromospheric activity of F-, G-, and K-type stars observed by the LAMOST Medium-Resolution Spectroscopic Survey
• Flare Activity and Magnetic Feature Analysis of the Flare Stars
• fBLS -- a fast-folding BLS algorithm
• Flare Activity and Magnetic Feature Analysis of the Flare Stars II: Sub-Giant Branch
• Chirality and magnetic configuration associated with two-ribbon solar flares: AR 10930 versus AR 11158