Characterising Young Visual M-dwarf Binaries with Near-Infrared Integral Field Spectra. (arXiv:2007.12183v1 [astro-ph.SR])
<a href="http://arxiv.org/find/astro-ph/1/au:+Calissendorff_P/0/1/0/all/0/1">Per Calissendorff</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Janson_M/0/1/0/all/0/1">Markus Janson</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Bonnefoy_M/0/1/0/all/0/1">Mickaël Bonnefoy</a>
We present the results from an integral field spectroscopy study of seven
close visual binary pairs of young M-dwarf multiple systems. The target systems
are part of the astrometric monitoring AstraLux program, surveying hundreds of
M-dwarf systems for multiplicity and obtaining astrometric epochs for orbital
constraints. Our new VLT/SINFONI data provides resolved spectral type
classification in the J, H and K bands for seven of these low-mass M-dwarf
binaries, which we determine by comparing them to empirical templates and
examining the strength of water absorption in the K-band. The medium resolution
K-band spectra also allows us to derive effective temperatures for the
individual components. All targets in the survey display several signs of
youth, and some have kinematics similar to young moving groups, or low surface
gravities which we determine from measuring equivalent widths of gravity
sensitive alkali lines in the J-band. Resolved photometry from our targets is
also compared with isochrones from theoretical evolutionary models, further
implying young ages. Dynamical masses will be provided from ongoing monitoring
of these systems, which can be seen as emblematic binary benchmarks that may be
used to calibrate evolutionary models for low-mass stars in the future.
We present the results from an integral field spectroscopy study of seven
close visual binary pairs of young M-dwarf multiple systems. The target systems
are part of the astrometric monitoring AstraLux program, surveying hundreds of
M-dwarf systems for multiplicity and obtaining astrometric epochs for orbital
constraints. Our new VLT/SINFONI data provides resolved spectral type
classification in the J, H and K bands for seven of these low-mass M-dwarf
binaries, which we determine by comparing them to empirical templates and
examining the strength of water absorption in the K-band. The medium resolution
K-band spectra also allows us to derive effective temperatures for the
individual components. All targets in the survey display several signs of
youth, and some have kinematics similar to young moving groups, or low surface
gravities which we determine from measuring equivalent widths of gravity
sensitive alkali lines in the J-band. Resolved photometry from our targets is
also compared with isochrones from theoretical evolutionary models, further
implying young ages. Dynamical masses will be provided from ongoing monitoring
of these systems, which can be seen as emblematic binary benchmarks that may be
used to calibrate evolutionary models for low-mass stars in the future.
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