J/A+A/580/A88 Stellar multiplicity in 3-1000AU (Elliott+, 2015)
Search for associations containing young stars (SACY).
VI. Is multiplicity universal? Stellar multiplicity in the range 3-1000 au
from adaptive-optics observations.
Elliott P., Huelamo N., Bouy H., Bayo A., Melo C.H.F., Torres C.A.O.,
Sterzik M.F., Quast G.R., Chauvin G., Barrado D.
<Astron. Astrophys. 580, A88 (2015)>
=2015A&A...580A..88E 2015A&A...580A..88E
ADC_Keywords: Stars, nearby ; Stars, double and multiple ; YSOs
Keywords: stars: pre-main sequence - stars: variables: T Tauri, Herbig Ae/Be -
techniques: high angular resolution - stars: statistics -
binaries: visual
Abstract:
Young loose nearby associations are unique samples of close (<150pc),
young (∼5-100Myr) pre-main sequence (PMS) stars. A significant
number of members of these associations have been identified in the
SACY collaboration. We can use the proximity and youth of these
members to investigate key ingredients in star formation processes,
such as multiplicity.
We present the statistics of identified multiple systems from 113
confirmed SACY members. We derive multiplicity frequencies,
mass-ratio, and physical separation distributions in a consistent
parameter space, and compare our results to other PMS populations and
the field.
We have obtained adaptive-optics assisted near-infrared observations
with NACO (ESO/VLT) and IRCAL (Lick Observatory) for at least one
epoch of all 113 SACY members. We have identified multiple systems
using co-moving proper-motion analysis and using contamination
estimates. We have explored ranges in projected separation and
mass-ratio of a [3-1000AU], and q [0.1-1], respectively.
We have identified 31 multiple systems (28 binaries and 3 triples).
We derive a multiplicity frequency (MF) of
MF3-1000AU=28.4+4.7-3.9% and a triple frequency (TF) of
TF3-1000AU=2.8+2.5-0.8% in the separation range of 3-1000AU. We
do not find any evidence for an increase in the MF with primary mass.
The estimated mass-ratio of our statistical sample (with power-law
index γ=-0.04±0.14) is consistent with a flat distribution
(γ=0).
Description:
Photometry and defining parameters of confirmed and potential multiple
components to objects studied in this work.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tablea1.dat 142 201 All targets analysed in this work
tableb1.dat 239 127 Photometry and parameters from individual
observations
refs.dat 64 21 References
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See also:
J/A+A/460/695 : Search for Associations Containing Young stars
(Torres+, 2006)
J/A+A/508/833 : SACY III. Li abundances (da Silva+, 2009)
J/MNRAS/431/1005 : SACY IV. IC 2391 and Argus young stars (de Silva+, 2013)
J/A+A/568/A26 : SACY V. Multiple systems (Elliott+, 2014)
Byte-by-byte Description of file: tablea1.dat
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Bytes Format Units Label Explanations
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1- 24 A24 --- Name Star name (as in Simbad database)
26- 27 I2 h RAh Right ascension (J2000)
29- 30 I2 min RAm Right ascension (J2000)
32- 35 F4.1 s RAs Right ascension (J2000)
37 A1 --- DE- Declination sign (J2000)
38- 39 I2 deg DEd Declination (J2000)
41- 42 I2 arcmin DEm Declination (J2000)
44- 45 I2 arcsec DEs Declination (J2000)
47- 51 F5.2 mag Vmag V magnitude
53- 57 F5.2 mag Ksmag Ks magnitude
59- 68 A10 --- SpType MK spectral type
70- 77 F8.2 mas/yr pmRA ? Proper motion along RA
81- 87 F7.2 mas/yr pmDE ? Proper motion along DE
89- 94 F6.2 pc Dist ? Parallax distance
98-105 A8 --- Pop Population (1)
107-108 I2 --- r_Pop ? Reference for Population, in refs.dat file
110-112 A3 --- Scl Simbad object classification
113 A1 --- n_Scl [bc] Notes on Simbad Class (2)
115-132 A18 --- Lflag Literature flag (3)
134-142 A9 --- Sflag SACY Flag (4)
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Note (1): Association of the star as follows.
ABD = AB Dor
ECH = epsilon Cha
ARG = Argus
BPC = beta-Pic MG
CAR = Carina
COL = Columba
OCT = Octans
THA = Tuc-Hor
Note (2): Notes on Simbad Class as follows:
b = Note in SIMBAD to potential component within 30"
c = Note in SIMBAD for triple system identified by
Malogolovets et al. (2007AstBu..62..117M 2007AstBu..62..117M)
Note (3): Literature flag.
* means multiple components e.g. A*Y: AB, AC, ..., AY.
References are in parentheses, explained in refs.dat file.
Note (4): SACY = Search for Associations Containing Young stars.
"SB" denote spectroscopic binary systems identified in
Torres et al. (2008, Young Nearby Loose Associations, 2, 757),
Elliott et al. (2014, Cat. J/A+A/568/A26).
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Byte-by-byte Description of file: tableb1.dat
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Bytes Format Units Label Explanations
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1- 23 A23 --- Name Name (as in Simbad database)
25- 30 F6.2 deg PA [0/361] Positional angle of component
32- 35 F4.2 deg e_PA [0.2/0.4] rms uncertainty on PA
37- 41 F5.2 arcsec Sep [0.09/11.5] Angular separation
43- 46 F4.2 arcsec e_Sep [0.01/0.02] rms uncertainty on ang_sep
48- 57 A10 "date" Date Date of observation
59- 66 A8 --- Inst Facility/instrument used for observation
68- 73 F6.3 mag Jmag J magnitude in 2MASS
75- 80 F6.3 mag Hmag H magnitude in 2MASS
82- 87 F6.3 mag Kmag K magnitude in 2MASS
89- 94 F6.3 mag J2mag ?=- J magnitude of component in 2MASS
96-101 F6.3 mag H2mag ?=- H magnitude of component in 2MASS
103-109 F7.4 mag K2mag ?=- K magnitude of component in 2MASS
111-117 F7.4 mag dJmag ?=- Observed difference magnitude in J band
119-127 F9.6 mag dHmag ?=- Observed difference magnitude in H band
129-134 F6.4 mag e_dHmag ?=- Relative uncertainty on observed magnitude
136-145 F10.7 mag dKmag ?=- Observed difference magnitude in K band
147-151 F5.3 mag Jmag1 ?=- Derived J magnitude of primary
153-157 F5.3 mag e_Jmag1 ?=- rms uncertainty of Jmag1
159-164 F6.3 mag Jmag2 ?=- Derived J magnitude of component
166-170 F5.3 mag e_Jmag2 ?=- rms uncertainty of Jmag2
172-176 F5.3 mag Hmag1 ?=- Derived H magnitude of primary
178-183 F6.4 mag e_Hmag1 ?=- rms uncertainty of Hmag1
185-190 F6.3 mag Hmag2 ?=- Derived H magnitude of component
192-197 F6.4 mag e_Hmag2 ?=- rms uncertainty of Hmag2
199-204 F6.3 mag Kmag1 ?=- Derived K magnitude of primary
206-211 F6.3 mag e_Kmag1 ?=- rms uncertainty of Kmag1
213-218 F6.3 mag Kmag2 ?=- Derived K magnitude of component
220-225 F6.3 mag e_Kmag2 ?=- rms uncertainty of Kmag2
227-230 F4.2 --- Pr [0/1]?=- Probability component is bound
232-235 A4 --- Meth Method used to extract photometry: PSF or APER
237-239 I3 --- Index [1/127] Index number of entry
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Byte-by-byte Description of file: refs.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- Ref Reference number
4- 22 A19 --- BibCode BibCode
24- 44 A21 --- Aut Author's name
46- 66 A21 --- Com Comments
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Acknowledgements:
Paul Elliott, pelliott(at)eso.org
References:
Torres et al., Paper I 2006A&A...460..695T 2006A&A...460..695T, Cat. J/A+A/460/695
Viana Almeida et al., Paper II 2009A&A...501..965V 2009A&A...501..965V, Cat. J/A+A/501/965
da Silva et al., Paper III 2009A&A...508..833D 2009A&A...508..833D, Cat. J/A+A/508/833
de Silva et al., Paper IV 2013MNRAS.431.1005D 2013MNRAS.431.1005D, Cat. J/MNRAS/431/1005
Elliott et al., Paper V 2014A&A...568A..26E 2014A&A...568A..26E, Cat. J/A+A/568/26
History:
* 07-Aug-2015: First on-line version
* 02-Nov-2015: tablea1 added (from electronic version)
(End) Paul Elliott [ESO, Chile], Patricia Vannier [CDS] 22-Jun-2015