Magnetic Fields in M dwarfs Observed by APOGEE: Relations with Effective Temperatures

Abstract

In this work, we study the relationship of effective temperature with mean magnetic field and Rossby number for M-dwarf stars. We compiled a sample of 163 field stars and 62 stars from the Pleiades young open cluster. We found no clear relation between effective temperature and stellar activity for partially convective field stars, although for Pleiades stars there is a trend, with cooler stars being more active. For fully-convective field stars, we note a large scatter in the relation between effective temperature and activity. Despite being much older, we found that the fully-convective field stars reach higher activity levels than the Pleiades partially convective stars.