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J/ApJ/789/102           Properties of late M-dwarfs              (Janson+, 2014)

The AstraLux multiplicity survey: extension to late M-dwarfs. Janson M., Bergfors C., Brandner W., Kudryavtseva N., Hormuth F., Hippler S., Henning T. <Astrophys. J., 789, 102 (2014)> =2014ApJ...789..102J (SIMBAD/NED BibCode)
ADC_Keywords: Stars, double and multiple ; Stars, dwarfs ; Stars, M-type ; Photometry ; Surveys Keywords: binaries: general - stars: late-type - techniques: high angular resolution Abstract: The distribution of multiplicity among low-mass stars is a key issue to understanding the formation of stars and brown dwarfs, and recent surveys have yielded large enough samples of nearby low-mass stars to study this issue statistically to good accuracy. Previously, we have presented a multiplicity study of ∼700 early/mid M-type stars observed with the AstraLux high-resolution Lucky Imaging cameras. Here, we extend the study of multiplicity in M-type stars through studying 286 nearby mid/late M-type stars, bridging the gap between our previous study and multiplicity studies of brown dwarfs. Most of the targets have been observed more than once, allowing us to assess common proper motion to confirm companionship. We detect 68 confirmed or probable companions in 66 systems, of which 41 were previously undiscovered. Detections are made down to the resolution limit of ∼100 mas of the instrument. The raw multiplicity in the AstraLux sensitivity range is 17.9%, leading to a total multiplicity fraction of 21%-27% depending on the mass ratio distribution, which is consistent with being flat down to mass ratios of ∼0.4, but cannot be stringently constrained below this value. The semi-major axis distribution is well represented by a log-normal function with µa= 0.78 and σa= 0.47, which is narrower and peaked at smaller separations than for a Sun-like sample. This is consistent with a steady decrease in average semi-major axis from the highest-mass binary stars to the brown dwarf binaries. Description: The targets in this study were selected from the Lepine & Gaidos (2011, J/AJ/142/138) sample, where stars with a spectral type (SpT) estimate of M5 or later were selected if they were sufficiently bright (J ≤ 10.0 mag) and sufficiently far north (>-15°) to be meaningfully observed with AstraLux Norte. In total, this gave an input sample of 408 potential targets, of which 286 were actually observed. All observations in this program were acquired with the AstraLux Norte camera on the 2.2 m telescope at Calar Alto in Spain. The 2.2 m telescope is on an equatorial mount. AstraLux uses an Andor DV887-UVB camera head equipped with a thinned, back-illuminated, electron-multiplying 512 x 512 pixel monolithic CCD. The CCD is equipped with two readout registers, one for conventional readout, and one 536 stage electron multiplication register. Each of the two registers comes with its own output amplifier. All Lucky Imaging data were obtained using the electron multiplication mode, and the associated output amplifier. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 90 286 General Properties of All Targets Observed in the Survey table2.dat 71 131 Astrometric Properties of the Binaries and Background Stars in the Survey table3.dat 101 69 Photometric and Physical Properties of the Binaries in the Survey
See also: J/AJ/123/3409 : SDSS M, L, and T dwarfs (Hawley+, 2002) J/AJ/129/2428 : M dwarf-white dwarf binary systems (Silvestri+, 2005) J/A+A/503/639 : NIR spectral of M-T dwarfs (Testi, 2009) J/AJ/137/1 : Proper motions and astrometry of late-type dwarfs (Faherty+, 2009) J/AJ/142/138 : All-sky catalog of bright M dwarfs (Lepine+, 2011) J/AJ/143/10 : 2008-2009 WIYN speckle observations of binaries. VII. (Horch+, 2012) J/ApJ/754/44 : The AstraLux Large M-dwarf Survey (Janson+ 2012) J/ApJ/758/56 : Young M dwarfs within 25pc. II. Kinematics (Shkolnik+, 2012) J/AJ/145/52 : Abundances of late K and M dwarfs in binary systems (Mann+, 2013) J/ApJ/762/88 : Young stellar kinematic group candidate members (Malo+, 2013) J/MNRAS/429/859 : New companions to nearby low-mass stars (Jodar+, 2013) J/PASP/125/809 : New nearby M, L, and T dwarfs (Thompson+, 2013) J/A+A/577/A128 : CARMENES input catalogue of M dwarfs. I (Alonso-Floriano+, 2015) J/AJ/150/42 : Catalog of 2612 M dwarfs from LAMOST (Zhong+, 2015) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 12 A12 --- ID ID from Lepine (G1) 14- 15 I2 h RAh Hour of Right Ascension (J2000) 17- 18 I2 min RAm Minute of Right Ascension (J2000) 20- 25 F6.3 s RAs Second of Right Ascension (J2000) 27 A1 --- DE- Sign of the Declination (J2000) 28- 29 I2 deg DEd Degree of Declination (J2000) 31- 32 I2 arcmin DEm Minute of Declination (J2000) 34- 38 F5.2 arcsec DEs Second of Declination (J2000) 40- 44 I5 mas/yr pmRA Proper motion in RA 46- 50 I5 mas/yr pmDE Proper motion in DE 52- 56 F5.1 mas plx Parallax 58- 61 F4.1 mas e_plx rms uncertainty on plx 63- 66 A4 --- r_plx Reference for plx in refs.dat file 68- 71 A4 --- SpType Spectral type (1) 73- 77 A5 --- r_SpType Reference for spectral type in refs.dat file 79- 82 F4.2 mag Jmag J magnitude 84- 88 A5 --- Mult Multiplicity flag (2) 90 A1 --- ND [YN-] Flag for whether the companion is a new discovery (Y) or not (N)
Note (1): lower case notation implies a color-based SpT estimation which may be biased, see text. Note (2): Multiplicity flag as follows: S = single, as far as is known. M = multiple within the AstraLux sensitivity range. C = a known companion exists in the literature but is too close in for AstraLux W = a known companion exists outside of the AstraLux completeness range. O = an object is observed in the AstraLux image, but is outside of the completeness range. BG = one or more suspected or confirmed background objects are observed in the images. See individual notes for detailed comments.
Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 12 A12 --- ID ID from Lepine (G1) 14- 23 A10 --- OtherID Other ID 25- 28 A4 --- Pair Pair 30- 34 F5.3 arcsec rho Separation angle 36- 40 F5.3 arcsec e_rho rms uncertainty on rho 42- 46 F5.1 deg theta Position angle 48- 50 F3.1 deg e_theta rms uncertainty on theta 51 A1 --- n_theta [d] Note on theta (4) 53- 59 F7.2 yr Epoch Epoch 61- 63 A3 --- Ref Source of the astrometry at the given epoch. Only one archival epoch listed per target (1) 65- 67 A3 --- CPM Flag for common proper motion (2) 69- 71 A3 --- OM Flag for orbital motion (3)
Note (1): References as follows : TP = this paper WDS = Washington Double Star Catalog, Mason et al. (2001AJ....122.3466M, Cat.B/wds) M01 = McCarthy et al. (2001AJ....121.3259M) B04 = Beuzit et al. (2004A&A...425..997B); uniform errors assumed M06 = Montagnier et al. (2006A&A...460L..19M) P06 = Pravdo et al. (2006ApJ...649..389P) D07 = Daemgen et al. (2007ApJ...654..558D) L08 = Law et al. (2008MNRAS.384..150L) D10 = Dupuy et al. (2010ApJ...721.1725D) orbital analysis; original data point from Montagnier et al. (2006A&A...460L..19M) H12 = Horch et al. (2012, J/AJ/143/10) J12 = Janson et al. (2012, J/ApJ/754/44) J13 = Jodar et al. (2013, J/MNRAS/429/859) Note (2): Flag for common proper motion (evaluated between the first and last listed epochs), as follows : Y = yes N = no I = inferred Note (3): Flag for orbital motion (between the first and last listed epochs), as follows : Y = yes N = no U = unclear BG = background Note (4): d for quoted angle assumes a phase shift, see individual note for the target.
Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
1- 12 A12 --- ID ID from Lepine (G1) 14- 23 A10 --- OtherID Other ID 25- 28 A4 --- Pair Pair 30- 33 F4.2 mag Dz'mag Magnitude difference in z' band 35- 38 F4.2 mag e_Dz'mag rms uncertainty on Dz'mag 40- 43 F4.2 mag Di'mag ?=- Magnitude difference in i' band 45- 48 F4.2 mag e_Di'mag ? rms uncertainty on Di'mag 50- 53 I4 Myr tau-low Lower age estimation 55- 59 I5 Myr tau-high Upper age estimation 61- 64 A4 --- Ref Basis for the age estimation (1) 66- 69 F4.2 Msun massA Mass of A component 71- 74 F4.2 Msun e_massA rms uncertainty on massA 76- 79 F4.2 Msun massB Mass of B component 81- 84 F4.2 Msun e_massB rms uncertainty on massB 86- 89 F4.2 --- q Mass ratio 91- 94 F4.2 --- e_q rms uncertainty on q 96- 99 F4.1 AU aest Major axis estimation 101 A1 --- SC [YN-] Flag for whether targets is statistically clean (Y) or not (N)
Note (1): References as follows : Sc12 = Member of AB Dor of β Pic moving group according to Schlieder et al. (2012AJ....144..109S) Sh12 = Estimated age in Shkolnik et al. (2012, J/ApJ/758/56) M13 = Member of a young moving group according to Malo et al. (2013, J/ApJ/762/88) VY = Assumed very young based on high X-ray flux (as listed in Lepine & Gaidos 2011, J/AJ/142/138) MY = Assumed moderately young based on moderate X-ray flux NY = Assumed not young based on lack of detectable X-ray flux Note (G1): From Lepine & Gaidos (2011AJ....142..138L), IHHMMm+DDMMN, PM JHHMMm+DDMMN in Simbad
History: From electronic version of the journal
(End) Prepared by [AAS], Tiphaine Pouvreau [CDS] 07-Mar-2017
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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