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 84Ämneskategorier
Astronomi, astrofysik och kosmologi
DOI
10.3847/0004-6256/151/3/84