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- W3026631513 endingPage "1270" @default.
- W3026631513 startingPage "1252" @default.
- W3026631513 abstract "ABSTRACT Stellar magnetic activity is an interesting phenomenon in late-type stars. We use the medium-resolution spectroscopic observations of 406 069 late-type stars from LAMOST to explore their properties. We perform a statistical analysis on the magnetic activity of the stars and their associated physical parameters. Our samples are cross-matched with other data bases (LAMOST DR5, VSX, and SDSS DR12) to obtain additional observational properties. The equivalent widths (EWs) of Hα lines, an indicator of chromospheric activity, are calculated. According to the EWs of the Hα line, we detect 8816 spectra with apparent Hα emission for a total of 2115 stars among the 2 108 565 spectra analysed. Furthermore, 1521 of these stars show variability in their Hα lines. In addition, we detect 2132 flare events associated with 41 542 stars from the catalogue by cross-matching our LAMOST medium-resolution samples and the Kepler and K2 data bases. We also confirm a weak relationship of the flare amplitude with increasing Rossby number. There is a clear decease in the strength of chromospheric activity (LHα/Lbol) with increasing rotation period. Moreover, the ratio of the flare energy and stellar luminosity is found to decrease with the stellar mass." @default.
- W3026631513 created "2020-05-29" @default.
- W3026631513 creator A5008167858 @default.
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- W3026631513 creator A5043069455 @default.
- W3026631513 creator A5052491660 @default.
- W3026631513 creator A5090859729 @default.
- W3026631513 date "2020-05-22" @default.
- W3026631513 modified "2023-10-13" @default.
- W3026631513 title "Magnetic activity based on LAMOST medium-resolution spectra and the Kepler survey" @default.
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