Stellar Characterization and Radius Inflation of Hyades M-dwarf Stars from the APOGEE Survey - Sorbonne Université Access content directly
Journal Articles The Astrophysical Journal Year : 2023

Stellar Characterization and Radius Inflation of Hyades M-dwarf Stars from the APOGEE Survey

Fábio Wanderley
Katia Cunha
Diogo Souto
Verne V Smith
Lyra Cao
Marc Pinsonneault
C Allende Prieto
Kevin Covey
Thomas Masseron
Ilaria Pascucci
Keivan G Stassun
Ryan Terrien
Galen J Bergsten
Dmitry Bizyaev
José G Fernández-Trincado
Henrik Jönsson
Sten Hasselquist
Jon A Holtzman
Richard R Lane
Suvrath Mahadevan
Steven R Majewski
Dante Minniti
Kaike Pan
Javier Serna
Jennifer Sobeck
Guy S Stringfellow

Abstract

We present a spectroscopic analysis of a sample of 48 M-dwarf stars (0.2 M e < M < 0.6 M e) from the Hyades open cluster using high-resolution H-band spectra from the Sloan Digital Sky Survey/Apache Point Observatory Galactic Evolution Experiment (APOGEE) survey. Our methodology adopts spectrum synthesis with LTE MARCS model atmospheres, along with the APOGEE Data Release 17 line list, to determine effective temperatures, surface gravities, metallicities, and projected rotational velocities. The median metallicity obtained for the Hyades M dwarfs is [M/H] = 0.09 ± 0.03 dex, indicating a small internal uncertainty and good agreement with optical results for Hyades red giants. Overall, the median radii are larger than predicted by stellar models by 1.6% ± 2.3% and 2.4% ± 2.3%, relative to a MIST and DARTMOUTH isochrone, respectively. We emphasize, however, that these isochrones are different, and the fractional radius inflation for the fully and partially convective regimes have distinct behaviors depending on the isochrone. Using a MIST isochrone there is no evidence of radius inflation for the fully convective stars, while for the partially convective M dwarfs the radii are inflated by 2.7% ± 2.1%, which is in agreement with predictions from models that include magnetic fields. For the partially convective stars, rapid rotators present on average higher inflation levels than slow rotators. The comparison with SPOTS isochrone models indicates that the derived M-dwarf radii can be explained by accounting for stellar spots in the photosphere of the stars, with 76% of the studied M dwarfs having up to 20% spot coverage, and the most inflated stars with ∼20%-40% spot coverage. Unified Astronomy Thesaurus concepts: M dwarf stars (982); Near infrared astronomy (1093); Open star clusters (1160); Stellar activity (1580); Metallicity (1031)
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hal-04271377 , version 1 (06-11-2023)

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Fábio Wanderley, Katia Cunha, Diogo Souto, Verne V Smith, Lyra Cao, et al.. Stellar Characterization and Radius Inflation of Hyades M-dwarf Stars from the APOGEE Survey. The Astrophysical Journal, 2023, 951 (90), ⟨10.3847/1538-4357/acd4bd⟩. ⟨hal-04271377⟩
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