AN M DWARF COMPANION TO AN F-TYPE STAR IN A YOUNG MAIN-SEQUENCE BINARY
Artikel i vetenskaplig tidskrift, 2016

Only a few well characterized very low-mass M dwarfs are known today. Our understanding of M dwarfs is vital as these are the most common stars in our solar neighborhood. We aim to characterize the properties of a rare F+dM stellar system for a better understanding of the low-mass end of the Hertzsprung-Russel diagram. We used photometric light curves and radial velocity follow-up measurements to study the binary. Spectroscopic analysis was used in combination with isochrone fitting to characterize the primary star. The primary star is an early F-type main-sequence star with a mass of (1.493 +/- 0.073) M-circle dot and a radius of (1.474 +/- 0.040) R-circle dot. The companion is an M dwarf with a mass of (0.188 +/- 0.014) M-circle dot and a radius of (0.234 +/- 0.009) R-circle dot. The orbital period is (1.35121 +/- 0.00001) days. The secondary star is among the lowest-mass M dwarfs known to date. The binary has not reached a 1: 1 spin-orbit synchronization. This indicates a young main-sequence binary with an age below similar to 250 Myr. The mass-radius relation of both components are in agreement with this finding.

stars: evolution

binaries: eclipsing

stars: low-mass

binaries: close

Författare

Philipp Eigmüller

Deutsches Zentrums für Luft- und Raumfahrt (DLR)

Thüringer Landessternwarte Tautenburg

J. Eisloffel

Thüringer Landessternwarte Tautenburg

S. Csizmadia

Deutsches Zentrums für Luft- und Raumfahrt (DLR)

H. Lehmann

Thüringer Landessternwarte Tautenburg

A. Erikson

Deutsches Zentrums für Luft- und Raumfahrt (DLR)

Malcolm Fridlund

Chalmers, Rymd- och geovetenskap, Radioastronomi och astrofysik

M. Hartmann

Thüringer Landessternwarte Tautenburg

A. Hatzes

Thüringer Landessternwarte Tautenburg

T. Pasternacki

Deutsches Zentrums für Luft- und Raumfahrt (DLR)

H. Rauer

Deutsches Zentrums für Luft- und Raumfahrt (DLR)

Technische Universität Berlin

A. Tkachenko

KU Leuven

H. Voss

Universitat de Barcelona

Astronomical Journal

0004-6256 (ISSN) 1538-3881 (eISSN)

Vol. 151 3 84

Ämneskategorier

Astronomi, astrofysik och kosmologi

DOI

10.3847/0004-6256/151/3/84