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• W2510888232 endingPage "2512" @default.
• W2510888232 startingPage "2494" @default.
• W2510888232 abstract "We use the spectra of Pleiades and field stars from LAMOST DR2 archive to study how spottedness and activity vary as a function of mass at young ages. We obtained standard TiO band strength by measuring TiO bands near 7050 $AA$ from LAMOST spectra (R$approx$1800) for large sample of field GKM dwarfs with solar metallicity. Analysis show that active dwarfs, including late G- and early K-type, have extra TiO absorption compare to inactive counterparts, indicating the presence of cool spots on their surface. Active late K- and M-dwarfs show deeper TiO2 and shallower TiO4 compare to inactive stars at a given TiO5, which could be partly explained through cool spots. We estimated cool spot fractional coverage for 304 Pleiades candidates by modelling their TiO2 (&TiO5) band strength with respect to standard value. Results show that surface of large fraction of K- and M-type members have very large spot coverage ($sim$50%). We analysed a correlation between spot coverage, rotation and the amplitude of light variation, and found spot coverage on slow rotators ($R_{o}$ > 0.1) increases with decreasing Rossby Number $R_{o}$. Interestingly, we detected a saturation-like feature for spot coverage in fast rotators with a saturation level of 40%-50%. In addition, spot distribution in hotter fast rotators show more symmetrical compare to slow rotators. More interestingly, we detected large spot coverage in many M type members with no or little light variation. In bigger picture, these results provide important constraints for stellar dynamo on these cool active stars." @default.
• W2510888232 created "2016-09-16" @default.
• W2510888232 creator A5003333915 @default.
• W2510888232 creator A5024335044 @default.
• W2510888232 creator A5040585002 @default.
• W2510888232 creator A5041556252 @default.
• W2510888232 creator A5058139829 @default.
• W2510888232 date "2016-09-27" @default.
• W2510888232 modified "2023-10-01" @default.
• W2510888232 title "Stellar activity with LAMOST – I. Spot configuration in Pleiades" @default.
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• W2510888232 doi "https://doi.org/10.1093/mnras/stw1923" @default.

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