AN M DWARF COMPANION TO AN F-TYPE STAR IN A YOUNG MAIN-SEQUENCE BINARY

Eigmüller, PhilippDeutsches Zentrums für Luft- und Raumfahrt (DLR),German Aerospace Center (DLR),Thüringer Landessternwarte Tautenburg (författare)

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.

Eisloffel, J.Thüringer Landessternwarte Tautenburg (författare)
Csizmadia, S.Deutsches Zentrums für Luft- und Raumfahrt (DLR),German Aerospace Center (DLR) (författare)
Lehmann, H.Thüringer Landessternwarte Tautenburg (författare)
Erikson, A.Deutsches Zentrums für Luft- und Raumfahrt (DLR),German Aerospace Center (DLR) (författare)
Fridlund, Malcolm,1952Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)malfri (författare)
Hartmann, M.Thüringer Landessternwarte Tautenburg (författare)
Hatzes, A.Thüringer Landessternwarte Tautenburg (författare)
Pasternacki, T.Deutsches Zentrums für Luft- und Raumfahrt (DLR),German Aerospace Center (DLR) (författare)
Rauer, H.Deutsches Zentrums für Luft- und Raumfahrt (DLR),German Aerospace Center (DLR),Technische Universität Berlin (författare)
Tkachenko, A.Katholieke Universiteit Leuven (författare)
Voss, H.Universitat de Barcelona,University of Barcelona (författare)
Deutsches Zentrums für Luft- und Raumfahrt (DLR)Thüringer Landessternwarte Tautenburg (creator_code:org_t)

Ingår i:Astronomical Journal: American Astronomical Society151:31538-38810004-6256

Av författaren/redakt...: Eigmüller, Phili ...; Eisloffel, J.; Csizmadia, S.; Lehmann, H.; Erikson, A.; Fridlund, Malcol ...; visa fler...; Hartmann, M.; Hatzes, A.; Pasternacki, T.; Rauer, H.; Tkachenko, A.; Voss, H.; visa färre...

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