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J/A+A/590/A13      New candidate members in young associations  (Elliott+, 2016)

Search for associations containing young stars (SACY). VII. New stellar and sub-stellar candidate members in the young associations. Elliott P., Bayo A., Melo C.H.F., Torres C.A.O., Sterzik M.F., Quast G.R., Montes D., Brahm R. <Astron. Astrophys. 590, A13 (2016)> =2016A&A...590A..13E (SIMBAD/NED BibCode)
ADC_Keywords: Associations, stellar ; Clusters, globular ; Proper motions ; Photometry ; Equivalent widths Keywords: data analysis - open clusters and associations: general proper motions - stars: kinematics and dynamics - stars: low-mass Abstract: The young associations offer us one of the best opportunities to study the properties of young stellar and sub-stellar objects and directly image planets thanks to their proximity (<200pc) and age (5-150Myr). However, many previous works have been limited to identifying the brighter, more active members (1Msun) due to photometric survey sensitivities limiting the detections of lower-mass objects. We search the field of view of 542 previously identified members of the young associations to identify wide / extremely wide (1000-100,000au in physical separation) companions. Methods. We have combined 2MASS near-infrared photometry (J, H, K) with proper motion values (from UCAC4, PPMXL, NOMAD) to identify companions in the field of view of known members. We collated further photometry and spectroscopy from the literature and conducted our own high-resolution spectroscopic observations for a sub-sample of candidate members. This complementary information allowed us to assess the efficiency of our method. We identified 84 targets (45:0.2-1.3M, 17:0.08-0.2M, 22:<0.08M) in our analysis, 10 of which have been identified from spectroscopic analysis in previous young association works. For 33 of these 84 we were able to further assess their membership using a variety of properties (X-ray emission, UV excess, Hα, lithium and KI equivalent widths, radial velocities, and CaH indices). We derive a success rate of 76-88% for this technique based on the consistency of these properties. Once confirmed, the targets identified in this work would significantly improve our knowledge of the lower-mass end of the young associations. Additionally, these targets would make an ideal new sample for the identification and study of planets around nearby young stars. Given the predicted sub-stellar mass of the majority of these new candidate members and their proximity, high-contrast imaging techniques would facilitate the search for new low-mass planets. Description: Full photometric, spectroscopic and kinematic properties, with references, of new candidate members in the moving groups, identified in this work. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file appene.dat 419 83 Properties of new candidate members (full table4) tabled1.dat 110 542 Basic properties of the original sample used in this work refs.dat 86 31 References
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) J/A+A/580/A88 : SACY VI. Stellar multiplicity in 3-1000AU (Elliott+, 2015) Byte-by-byte Description of file: appene.dat
Bytes Format Units Label Explanations
1- 5 A5 --- --- [2MASS] 7- 23 A17 --- 2MASS 2MASS designation (JHHMMSSss+DDMMSSs) 25- 33 F9.5 deg RAdeg Right ascension (J2000.0) 35- 44 F10.6 deg DEdeg Declination (J2000.0) 46- 54 F9.5 pc Distk Distance (kinematic) 56- 63 F8.4 pc Distp ? Distance (parallactic) 66- 70 F5.1 mas/yr pmRA Proper motion in right ascension 72- 74 F3.1 mas/yr e_pmRA Uncertainty of pmRA 76- 80 F5.1 mas/yr pmDE Proper motion in declination 82- 85 F4.1 mas/yr e_pmDE Uncertainty of pmDE 87- 91 A5 --- r_pmDE Reference for proper motion, in refs.dat file 93- 96 F4.1 km/s RV ? Radial velocity 98-100 F3.1 km/s e_RV ? Uncertainty of RV 102-108 A7 --- r_RV Reference for radial velocity, in refs.dat file 110-115 F6.3 mag Hmag H magnitude 117-122 F6.3 mag Jmag J magnitude 124-129 F6.3 mag Kmag K magnitude 131-133 A3 --- Assoc Association name 135-137 I3 0.1pm EWLi ? Lithium equivalent width 139-145 A7 --- r_EWLi Reference for lithium equivalent width, in refs.dat file 147-154 F8.5 mag Bmag ? B magnitude 156-183 A28 --- r_Bmag References for B magnitude, in refs.dat file 185-192 F8.5 mag Vmag ? V magnitude 194-220 A27 --- r_Vmag References for V magnitude, in refs.dat file 222-229 F8.5 mag Rmag ? R magnitude 230-254 A25 --- r_Rmag References for R magnitude, in refs.dat file 255-260 F6.3 0.1nm EWHa ? H alpha equivalent width 262-266 F5.3 0.1nm e_EWHa ? Uncertainty of EWHa 268-274 A7 --- r_EWHa Reference for H alpha equivalent width, in refs.dat file 276-282 F7.5 [-] logLX/Lbol ? X-ray/bolometric luminosity ratio (log) 284-290 A7 --- r_logLX/Lbol Reference for logLX/Lbol, in refs.dat file 292-296 F5.3 --- CaH2 ? Calcium Hydroxide index 2 298-304 A7 --- r_CaH2 Reference for CaH2, in refs.dat file 306-310 F5.3 --- CaH3 ? Calcium Hydroxide index 3 312-318 A7 --- r_CaH3 Reference for CaH3, in refs.dat file 320-325 F6.4 0.1nm EWNaI ? Sodium I equivalent width 327-333 A7 --- r_EWNaI Reference for EWNaI, in refs.dat file 335-340 F6.4 0.1nm EWKI ? Potassium I equivalent width 342-348 A7 --- r_EWKI Reference for EWKI, in refs.dat file 350-375 A26 --- c Youth consistent quantities 377-378 A2 --- Memb [YN? ] Membership flag 380-417 A38 --- r_c References for youth consistent quantities, in refs.dat file 419 A1 --- Cata [Y] Optical flaring in Catalina photometry
Byte-by-byte Description of file: tabled1.dat
Bytes Format Units Label Explanations
1- 3 A3 --- Assoc Association name 5- 29 A25 --- Name Star name 31- 32 I2 h RAh Right ascension (J2000) 34- 35 I2 min RAm Right ascension (J2000) 37- 40 F4.1 s RAs Right ascension (J2000) 42 A1 --- DE- Declination sign (J2000) 43- 44 I2 deg DEd Declination (J2000) 46- 47 I2 arcmin DEm Declination (J2000) 49- 52 F4.1 arcsec DEs Declination (J2000) 54- 58 F5.1 pc Dist Distance 59 A1 --- n_Dist [a] Note on Dist (1) 61- 64 F4.1 mag Jmag J magnitude 66- 69 F4.1 mag Hmag H magnitude 71- 74 F4.1 mag Kmag K magnitude 78- 83 F6.1 mas/yr pmRA Proper motion along RA, pmRA*cosDE 85- 88 F4.1 mas/yr e_pmRA rms uncertainty on pmRA 93- 98 F6.1 mas/yr pmDE Proper motion along DE 100-103 F4.1 mas/yr e_pmDE rms uncertainty on pmDE 105-110 A6 --- Ref Membership reference (2)
Note (1): a: Distances from parallax measurements. Note (2): References as follows: 1 = SACY works (Torres et al., 2008, Cat. J/A+A/460/695; Elliott et al., 2014, Cat. J/A+A/568/A26) 2 = Zuckerman et al. (2011ApJ...732...61Z) 3 = Malo et al. (2014, Cat. J/ApJ/788/81) 4 = Murphy & Lawson (2015, Cat. J/MNRAS/447/1267) 5 = Kraus et al. (2014, Cat. J/AJ/147/146)
Byte-by-byte Description of file: refs.dat
Bytes Format Units Label Explanations
1- 7 A7 --- Ref Reference code 9- 27 A19 --- BibCode BibCode 29- 49 A21 --- Aut Author's name 51- 86 A36 --- Com Comments
Acknowledgements: Paul Elliott, pelliott(at)eso.org References: Torres et al., Paper I 2006A&A...460..695T, Cat. J/A+A/460/695 Viana Almeida et al., Paper II 2009A&A...501..965V da Silva et al., Paper III 2009A&A...508..833D, Cat. J/A+A/508/833 de Silva et al., Paper IV 2013MNRAS.431.1005D, Cat. J/MNRAS/431/1005 Elliot et al., Paper V 2014A&A...568A..26E, Cat. J/A+A/568/A26 Elliot et al., Paper VI 2014A&A...580A..88E, Cat. J/A+A/580/A88 History: 28-Apr-2016: on-line version 15-Sep-2016: table D1 added (from electronic version of the paper) 09-Mar-2018: Sign of declination corrected in appene.dat file
(End) Paul Elliott [ESO, Chile], Patricia Vannier [CDS] 17-Mar-2016
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