J/A+A/599/A70 Young moving group M-dwarf multiplicity (Janson+, 2017)
Binaries among low-mass stars in nearby young moving groups.
Janson M., Durkan S., Hippler S., Dai X., Brandner W., Schlieder J.,
Bonnefoy M., Henning T.
<Astron. Astrophys. 599, A70 (2017)>
=2017A&A...599A..70J 2017A&A...599A..70J (SIMBAD/NED BibCode)
ADC_Keywords: Stars, double and multiple ; Stars, late-type ;
Stars, pre-main sequence
Keywords: binaries: visual - stars: low-mass - stars: pre-main sequence
Abstract:
The solar galactic neighbourhood contains a number of young co-moving
associations of stars (so-called 'young moving groups') with ages of
∼10-150 Myr, which are prime targets for a range of scientific
studies, including direct imaging planet searches. The late-type
stellar population of such groups still remain in their pre-main
sequence phase, and are thus well suited for purposes such as
isochronal dating. Close binaries are particularly useful in this
regard, since they allow for a model-independent dynamical mass
determination. Here we present a dedicated effort to identify new
close binaries in nearby young moving groups, through high-resolution
imaging with the AstraLux Sur Lucky Imaging camera. We surveyed 181
targets, resulting in the detection of 61 companions or candidates, of
which 38 are new discoveries.
Description:
Tables summarizing the properties of the full observed sample, as well
as photometry and astrometry along with some derived quantities for
the binaries resolved in the survey.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 66 181 Full sample summary
table2.dat 61 70 Astrometric properties
table3.dat 51 51 Photometric properties
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Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 17 A17 --- 2MASS 2MASS identifier (JHHMMSSss+DDMMSSs)
19- 22 A4 --- SpType Spectral type
24- 27 A4 --- YMG Young Moving Group assignment
29- 32 A4 --- r_YMG Reference for the YMG assignment (1)
34- 38 F5.2 mag Jmag Apparent J-band magnitude from 2MASS
40- 45 F6.1 mas/yr pmRA Proper motion along right ascension
47- 52 F6.1 mas/yr pmDE Proper motion along declination
54- 59 F6.1 pc Dist Distance to the target
61- 64 A4 --- Method Method for determining the distance (2)
66 I1 --- Mult Multiplicity count (3)
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Note (1): Reference for the association allocation as follows:
BII = Re-evaluation in this work with BANYANII, based on ambiguous
classification in previous works
GBII = Re-evaluation based on GAIA data
G15 = Gagne et al., 2015ApJ...798...73G 2015ApJ...798...73G
K14 = Kraus et al., 2014AJ....147..146K 2014AJ....147..146K
M13 = Malo et al., 2013ApJ...762...88M 2013ApJ...762...88M
M14 = Malo et al., 2014ApJ...788...81M 2014ApJ...788...81M
Note (2): Method of distance estimation as follows:
Plx = Parallax
Kin = Kinematics
Spec = Spectroscopic
Note (3): The number of components seen in the AstraLux images
(i.e. 1 is single, etc).
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 17 A17 --- 2MASS 2MASS identifier
19- 23 A5 --- Pair Pair identifier (1)
26- 31 F6.3 arcsec Sep Separation at the given epoch
33- 37 F5.3 arcsec e_Sep Separation error
39- 43 F5.1 deg PA Position angle at the given epoch
45- 47 F3.1 deg e_PA Position angle error
49- 55 F7.2 yr Epoch Epoch of observation
57 A1 --- CPM Common Proper Motion flag (2)
59- 61 A3 --- r_CPM Reference for CPM determination (3)
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Note (1): Pair displays false triple effect -- possibly subject to a
180 deg ambiguity.
Note (2): Flag for CPM as follows:
Y = if proven CPM
N = if non-CPM
U = if undetermined
I = if implied (see paper)
Note (3): CPM reference as follows:
TP = This paper
WDS = The Washington Double Star catalogue (Mason et al., 2001, Cat. I/281/)
B15 = Bowler et al., 2015ApJS..216....7B 2015ApJS..216....7B
C10 = Chauvin et al., 2010A&A...509A..52C 2010A&A...509A..52C
D99 = Delfosse et al., 1999A&A...350L..39D 1999A&A...350L..39D
D13 = Delorme et al., 2013A&A...553L...5D 2013A&A...553L...5D
E15 = Elliott et al., 2015A&A...580A..88E 2015A&A...580A..88E
J01 = Jayawardhana & Brandeker, 2001ApJ...561L.111J 2001ApJ...561L.111J
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 17 A17 --- 2MASS 2MASS identifier
19- 20 A2 --- Pair Pair identifier
22- 25 F4.2 mag dzmag z'-band magnitude difference
27- 30 F4.2 mag e_dzmag z'-band magnitude error
32- 35 F4.2 Msun M1 Estimated mass of the primary
37- 41 F5.3 Msun M2 Estimated mass of the secondary
43- 45 I3 AU a Estimated semi-major axis
47- 51 I5 yr Porb Estimated orbital period
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Acknowledgements:
Markus Janson, markus.janson(at)astro.su.se
(End) Markus Janson [Stockholm Univ., Sweden] Patricia Vannier [CDS] 09-Dec-2016