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- W2896548879 abstract "Cool spots on the surface of magnetically-active stars modulate their observed brightnesses and temperatures, thereby affecting the stellar locus on the H-R diagram. Recent high precision space-based photometric surveys reveal the rotational modulation from spots on stars in young clusters, including K2 monitoring of the 125-Myr-old Pleiades cluster. However, lightcurves reveal only the asymmetries in the visible spot distributions rather than the total sizes of spots on stellar surfaces, which causes a discrepancy between the spot coverage measured by photometric and spectroscopic observations. In this paper, we simulate photometric variability introduced by randomly-distributed starspots on a 125-Myr-old coeval cluster. Our simulation results show that randomly distributed small spots on the stellar surface would explain this discrepancy that the photometric observations only reveal 10% to 40% of the spot coverage measured by spectra. The colors and luminosities of photospheres are modeled for a range of photospheric temperature, spot coverage, and spot temperature. The colors and luminosities of a simulated population are then compared to the luminosity spread of Pleiades members, excluding the 25% of candidates that are identified as non-members with Gaia DR2 astrometry. The observed luminosities of Pleiades members have a standard deviation of 0.05 dex, which could be entirely explained by spots with a star-to-star standard deviation of spot coverage of 10%, but with an average coverage area that is not well constrained." @default.
- W2896548879 created "2018-10-26" @default.
- W2896548879 creator A5021903490 @default.
- W2896548879 creator A5024452888 @default.
- W2896548879 creator A5085316826 @default.
- W2896548879 date "2018-12-04" @default.
- W2896548879 modified "2023-09-29" @default.
- W2896548879 title "The Effect of Spots on the Luminosity Spread of the Pleiades" @default.
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- W2896548879 doi "https://doi.org/10.3847/1538-4357/aaeb9b" @default.
- W2896548879 hasPublicationYear "2018" @default.
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