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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 (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:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 66 181 Full sample summary table2.dat 61 70 Astrometric properties table3.dat 51 51 Photometric properties
Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
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)
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 K14 = Kraus et al., 2014AJ....147..146K M13 = Malo et al., 2013ApJ...762...88M M14 = Malo et al., 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).
Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
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)
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 C10 = Chauvin et al., 2010A&A...509A..52C D99 = Delfosse et al., 1999A&A...350L..39D D13 = Delorme et al., 2013A&A...553L...5D E15 = Elliott et al., 2015A&A...580A..88E J01 = Jayawardhana & Brandeker, 2001ApJ...561L.111J
Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
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
Acknowledgements: Markus Janson, markus.janson(at)
(End) Markus Janson [Stockholm Univ., Sweden] Patricia Vannier [CDS] 09-Dec-2016
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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