J/A+A/642/A57 Young visual M-dwarf binaries spectra (Calissendorff+, 2020)
Characterising young visual M-dwarf binaries with near-infrared integral field
spectra.
Calissendorff P., Janson M., Bonnefoy M.
<Astron. Astrophys. 642, A57 (2020)>
=2020A&A...642A..57C 2020A&A...642A..57C (SIMBAD/NED BibCode)
ADC_Keywords: Stars, double and multiple ; Infrared sources ; Spectra, infrared
Keywords: binaries: close - binaries: visual - stars: fundamental parameters -
stars: low mass - techniques: spectroscopic
Abstract:
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.
Description:
The observed sample consists of seven nearby M-dwarf binaries or
higher hierarchical triple systems with a closely separated binary
pair.
Targets were observed from November 2018 to June 2019 with the
Spectrograph for INtegral Field Observations in the Near Infrared
(SINONI).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
list.dat 126 16 List of VLT/SINFONI spectra
fits/* . 16 Individual fits spectra
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Byte-by-byte Description of file: list.dat
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Bytes Format Units Label Explanations
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1- 23 A23 ---- Name 2MASS name
25 A1 --- m_Name [ABC] Multiplicity index on Name
27- 28 I2 h RAh Right ascension (J2000)
30- 31 I2 min RAm Right ascension (J2000)
33- 37 F5.2 s RAs Right ascension (J2000)
39 A1 --- DE- Declination sign (J2000)
40- 41 I2 deg DEd Declination (J2000)
43- 44 I2 arcmin DEm Declination (J2000)
46- 49 F4.1 arcsec DEs Declination (J2000)
51- 66 A16 --- AName Alternative name
68- 78 A11 "DD-MMM-YYYY" Obs.Date Observation date (1)
80- 83 A4 s ExpTimeJ Exposure time in J band (1)
85- 88 A4 s ExpTimeHK Exposure time in H + K band (1)
90- 91 A2 --- l_Airmass [~< ] Limit flag on Airmass (1)
92- 94 F3.1 --- Airmass Airmass (1)
96-101 A6 --- SpType Telluric STD spectral type (1)
103-126 A24 --- FileName Name of the fits spectrum in
subdirectory fits
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Note (1): From table1 of the paper.
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Acknowledgements:
Per Calissendorff, per.calissendorff(at)astro.su.se
(End) Patricia Vannier [CDS] 30-Jul-2020