Spectroscopic Observations of Convective Patterns in the Atmospheres of Metal‐poor Stars
Spectroscopic Observations of Convective Patterns in the Atmospheres of Metal‐poor Stars
Convective line asymmetries in the optical spectrum of two metal-poor stars, Gmb 1830 and HD 140283, are compared to those observed for solar metallicity stars. The line bisectors of the most metal-poor star, the subgiant HD 140283, show a significantly larger velocity span that the expectations for a solar-metallicity star …