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• W3104165312 abstract "We investigate the effect of helium abundance and $alpha$-element enhancement on the properties of convection in envelopes of solar-like main-sequence stars stars using a grid of 3D radiation hydrodynamic simulations. Helium abundance increases the mean molecular weight of the gas, and alters opacity by displacing hydrogen. Since the scale of the effect of helium may depend on the metallicity, the grid consists of simulations with three helium abundances ($Y=0.1, 0.2, 0.3$), each with two metallicities ($Z=0.001, 0.020)$. We find that changing the helium mass fraction generally affects structure and convective dynamics in a way opposite to that of metallicity. Furthermore, the effect is considerably smaller than that of metallicity. The signature of helium differs from that of metallicity in the manner in which the photospheric velocity distribution is affected. rev{We also find that helium abundance and surface gravity behave largely in similar ways, but differ in the way they affect the mean molecular weight}. A simple model for spectral line formation suggests that the bisectors and absolute Doppler shifts of spectral lines depends on the helium abundance. We look at the effect of $alpha$-element enhancement and find that it has a considerably smaller effect on the convective dynamics in the SAL compared to that of helium abundance." @default.
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• W3104165312 date "2013-11-11" @default.
• W3104165312 modified "2023-10-15" @default.
• W3104165312 title "HELIUM-ABUNDANCE AND OTHER COMPOSITION EFFECTS ON THE PROPERTIES OF STELLAR SURFACE CONVECTION IN SOLAR-LIKE MAIN-SEQUENCE STARS" @default.
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• W3104165312 doi "https://doi.org/10.1088/0004-637x/778/2/117" @default.
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