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J/AJ/153/14  Solar neighborhood XXXVIII. Nearby M dwarf systems (Winters+, 2017)

The solar neighborhood XXXVIII. Results from the CTIO/SMARTS 0.9M: trigonometric parallaxes for 151 nearby M dwarf systems. Winters J.G., Sevrinsky R.A., Jao W.-C., Henry T.J., Riedel A.R., Subasavage J.P., Lurie J.C., Ianna P.A., Finch C.T. <Astron. J., 153, 14-14 (2017)> =2017AJ....153...14W (SIMBAD/NED BibCode)
ADC_Keywords: Stars, M-type ; Stars, dwarfs ; Stars, distances ; Stars, nearby ; Parallaxes, trigonometric ; Photometry, VRI ; Proper motions Keywords: parallaxes - solar neighborhood - stars: distances - stars: low-mass - stars: statistics Abstract: We present 160 new trigonometric parallaxes for 151 M dwarf systems from the REsearch Consortium On Nearby Stars (RECONS) group's long-term astrometry/photometry program at the CTIO/SMARTS 0.9m telescope. Most systems (124 or 82%) are found to lie within 25pc. The stars have 119mas/yr≤µ≤828mas/yr and 3.85≤(V-K)≤8.47. Among these are 58 systems from the SuperCOSMOS-RECONS search, discovered via our proper motion trawls of the SuperCOSMOS digitized archival photographic plates, while the remaining stars were suspected via photometric distance estimates to lie nearby. Sixteen systems were newly discovered via astrometric perturbations to be binaries, many of which are ideal for accurate mass determinations due to their proximity and orbital periods on the order of a decade. A variability analysis of the stars presented, two-thirds of which are new results, shows six of the stars to vary by more than 20mmag. This effort brings the total number of parallaxes for M dwarf systems measured by RECONS to nearly 500 and increases by 26% the number of southern M dwarf systems with accurate trigonometric parallaxes placing them within 25pc. Description: Stars reported here were targeted during the astrometry program because they were likely to be red dwarfs within 25pc with no previous published πtrig. Of the 151 systems, 93 are from previous compendia of proper motion stars, primarily based on work by Luyten (Luyten, 1980nltt.bookQ....L), and 58 are from our SuperCOSMOS-RECONS (SCR) search (Hambly et al. 2004AJ....128..437H; Henry et al. 2004AJ....128.2460H). The systems have µ=118-828mas/yr, with 143 having µ>180mas/yr, the canonical cutoff for Luyten's Two-Tenths (LTT) Catalog. For all but two objects (only one epoch of photometry was available for WT 1637 and LHS 2024 at the time of the paper), at least two epochs of absolute VJRKCIKC photometry on the Johnson-Kron-Cousins system were measured for each parallax field. Two V filters that are photometrically indistinguishable to 7 millimagnitudes (mmag) (Jao et al. 2011AJ....141..117J), one R filter, and one I filter were used for series of observations spanning 2-16years, depending on the star (the central wavelengths for the two VJ filters, the RKC filter, and the IKC filter are 5438Å, 5475Å, 6425Å, and 8075Å, respectively). The 2048*2046 Tektronix CCD camera on the CTIO/SMARTS 0.9m with a pixel (px) scale of 0.401''/px was used for both astrometric and photometric observations. In order to mitigate the effects of image distortion at the edges of the CCD, only the central quarter of the chip was used, resulting in a 6.8*6.8 square field of view. Photometry in the near-infrared JHKs filters has been extracted from the Two Micron All Sky Survey (2MASS; Cutri et al. 2003, Cat. II/246) and is rounded to the nearest hundredth magnitude in Table1. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 99 160 Photometric data table2.dat 145 160 Astrometry data table4.dat 75 32 Information for confirmed multiples table5.dat 53 12 Candidate multiples and young stars notes.dat 605 29 Notes
See also: II/312 : GALEX-DR5 (GR5) sources from AIS and MIS (Bianchi+ 2011) II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003) IX/29 : ROSAT All-Sky Survey Faint Source Catalog (Voges+ 2000) IX/10 : ROSAT All-Sky Bright Source Catalogue (1RXS) (Voges+ 1999) J/AJ/152/141 : Solar neighborhood. XXXVII. RVs for M dwarfs (Benedict+, 2016) J/AJ/151/160 : 1103 parallaxes and proper motions from URAT (Finch+, 2016) J/AJ/150/6 : Solar neighborhood. XXXVI. VRI var. of M dwarfs (Hosey+, 2015) J/AJ/149/5 : Solar neighborhood. XXXV. M dwarfs distances (Winters+, 2015) J/AJ/147/94 : Solar neighborhood. XXXII. L and M dwarfs (Dieterich+, 2014) J/AJ/147/85 : Solar neighborhood. XXXIII. 45 M dwarfs (Riedel+, 2014) J/ApJ/784/156 : Parallaxes for nearby mid-to-late M dwarfs (Dittmann+, 2014) J/A+A/549/A109 : HARPS XXXI. The M-dwarf sample (Bonfils+, 2013) J/ApJ/758/56 : Young M dwarfs within 25pc. II. Kinematics (Shkolnik+, 2012) J/ApJS/201/19 : Hawaii Infrared Parallax Program. I. (Dupuy+, 2012) J/AJ/141/21 : CCD distance estimates of SCR targets (Winters+, 2011) J/AJ/139/205 : 2007-2008 WIYN speckle observations of binaries (Horch+, 2010) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 13 A13 --- Name Name of the M dwarf (1) 14- 16 A3 --- m_Name Components of multiple system (noted with capital letters A and B after the name) (G1) 18- 19 I2 h RAh Hour of Right Ascension (J2000) 21- 22 I2 min RAm Minute of Right Ascension (J2000) 24- 27 F4.1 s RAs Second of Right Ascension (J2000) 29 A1 --- DE- Sign of the Declination (J2000) 30- 31 I2 deg DEd Degree of Declination (J2000) 33- 34 I2 arcmin DEm Arcminute of Declination (J2000) 36- 37 I2 arcsec DEs Arcsecond of Declination (J2000) 39- 43 F5.2 mag Vmag [9.8/20] Johnson V-band magnitude (2) 44 A1 --- f_Vmag [Jd] Flag on Vmag (J or d) (3) 46- 50 F5.2 mag Rmag [8.9/19.2] Kron-Cousins R-band magnitude (2) 51 A1 --- f_Rmag [J] Flag 'J' on Rmag (3) 53- 57 F5.2 mag Imag [7.93/18.26] Kron-Cousins I-band magnitude (2) 58 A1 --- f_Imag [J] Flag 'J' on Imag (3) 60 I1 --- Nobs [1/5]? Number of observations (1-5) 61 A1 --- --- [/] 62 I1 --- Ref [1/3] Reference (1-3) (4) 63 A1 --- f_Ref [u] Flag 'u' on Ref for previously reported, but updated, photometry (5) 65- 69 F5.2 mag Jmag [6.84/12.02]? 2MASS J band magnitude 70 A1 --- f_Jmag [Jc] Flag on Jmag (J or c) (3) 72- 76 F5.2 mag Hmag [6.21/11.45]? 2MASS H band magnitude 77- 79 A3 --- f_Hmag Flag on Hmag (J and/or c) (3) 81- 85 F5.2 mag Ksmag [5.96/11.24]? 2MASS Ks band magnitude 86 A1 --- f_Ksmag [Jc] Flag on Ksmag (J or c) (3) 88- 91 F4.1 pc Dist [6.4/67.9]? Photometric distance estimate (dCCD) (6) 92- 94 A3 --- f_Dist Flag on Dist (a and/or b) (7) 96- 99 F4.1 pc e_Dist [1/14]? Distance uncertainty based on the photometry (σCCD)
Note (1): This table provides the VRIJHK photometry data for the 160 stars in 151 M dwarf systems. Note (2): As outlined in Winters et al. 2011 (Cat. J/AJ/141/21), photometric uncertainties are typically 30mmag for the V-band and 20mmag for the R- and I-bands. Note (3): The flags on photometry are defined as follows: c = 2MASS magnitude uncertainty greater than 50mmag. d = VRI photometry for individual components has been calculated using Point-Spread Function (PSF) reduction; J = The magnitude is blended due to one or more close companions. Note (4): The reference codes are defined as follows: 1 = This work; 2 = Winters et al. 2011 (Cat. J/AJ/141/21); 3 = Winters et al. 2015 (Cat. J/AJ/149/5). Note (5): A "u" next to the reference indicates that REsearch Consortium On Nearby Stars (RECONS) photometry was reported in a previous publication, but that the value listed here is updated due to additional data and supersedes previous results. Note (6): Photometric distance estimates are calculated using the relations described in Henry et al. (2004AJ....128.2460H). Please refer to Section 4.1 in the paper for further details. Note (7): The flags on the distance are defined as follows: a = The πtrig for this object places it beyond 25pc. Nearly all of these stars were originally thought to be within 25pc, but our new astrometry indicates that they are not. This in itself reveals important information about the stars, as discussed in Section 4.1; b = The photometric distance estimate is based upon the joint photometry for the system and is thus likely an underestimate.
Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 13 A13 --- Name Name of the M dwarf (1) 14- 16 A3 --- m_Name Components of multiple system (noted with capital letters A and B after the name) (G1) 18- 19 I2 h RAh Hour of Right Ascension (J2000) 21- 22 I2 min RAm Minute of Right Ascension (J2000) 24- 28 F5.2 s RAs Second of Right Ascension (J2000) 30 A1 --- DE- Sign of the Declination (J2000) 31- 32 I2 deg DEd Degree of Declination (J2000) 34- 35 I2 arcmin DEm Arcminute of Declination (J2000) 37- 40 F4.1 arcsec DEs Arcsecond of Declination (J2000) 42 A1 --- Flt [VRI] Filter in which πtrig was measured (V, R, or I) 44- 45 I2 --- Nsea [3/15] Number of seasons covered (Nsea) (2) 46 A1 --- f_Nsea [cs] Flag on Nsea (c or s) (3) 48- 50 I3 --- Nfr [33/200] Number of frames acquired for each star (Nfr) 52- 58 F7.2 yr Date0 [1999.9/2013.4] Starting date of the time interval covered by the data sequence 59 A1 --- --- [-] 60- 66 F7.2 yr Date1 [2002.46/2016.21] Ending date of the time interval covered by the data sequence 68- 72 F5.2 yr Time [2.32/15.61] Number of years of coverage (T) 74- 75 I2 --- Nref [5/16] Number of reference stars used in the field 77- 80 F4.1 mmag Var [6.4/34]? Result for photometric variability in the filter used for parallax observation 82- 86 F5.2 mas plxrel [15.74/97.82] Relative parallax (πrel) 88- 91 F4.2 mas e_plxrel [0.55/3.5] Uncertainty in relative parallax 93- 96 F4.2 mas pcorr [0.14/3.79] Correction to absolute parallax (πcor) (4) 98-101 F4.2 mas e_pcorr [0.02/0.79] Uncertainty in pcorr 103 A1 --- f_pcorr [b] Flag 'b' on pcorr when a generic correction of 1.50±0.50mas was adopted (5) 105-109 F5.2 mas plxabs [16.43/99.16] Final absolute parallax πabs 111-114 F4.2 mas e_plxabs [0.59/3.51] Uncertainty in plxabs 116 A1 --- f_plxabs [a] Flag 'a' on plxabs when the parallax value have had the orbital motion of the system subtracted 118-122 F5.1 mas/yr pm [118.5/827.7] Magnitude of the proper motion 124-126 F3.1 mas/yr e_pm [0.1/2.9] Uncertainty in pm 128-132 F5.1 deg pmPA [5.8/354] Position angle (measured east from north) of the proper motion 134-137 F4.2 deg e_pmPA [0.02/1.72] Uncertainty in pmPA 139-143 F5.1 km/s Vtan [11.2/111.4] Derived tangential velocity Vtan 145 A1 --- Note [N] Note (indicated with a 'N') from Section 4.5
Note (1): The object name "EHPM 2-801" was probably a mistake and was modified into "SCR 2105-5503" at CDS. Note (2): Where the six months when a star is observable counts as one season. Note (3): The observational flags are defined as follows: c = Continuous set of observations where multiple nights of data were taken in each season; s = Scattered observations when some seasons have only a single night of observations. Note (4): Needed because the reference stars are not at an infinite distance. Note (5): Because this field is in the direction of the Galactic center, the initial correction from the relative parallax to the absolute parallax for this object was erroneously large due to reddened reference stars. We have adopted a generic correction of 1.50±0.50mas.
Byte-by-byte Description of file: table4.dat
Bytes Format Units Label Explanations
1- 13 A13 --- Name Name of the M dwarf 14- 15 A2 --- m_Name [AB] Components of multiple system (noted with capital letters A and B after the name) (G1) 17- 18 I2 h RAh Hour of Right Ascension (J2000) 20- 21 I2 min RAm Minute of Right Ascension (J2000) 23- 26 F4.1 s RAs Second of Right Ascension (J2000) 28 A1 --- DE- Sign of the Declination (J2000) 29- 30 I2 deg DEd Degree of Declination (J2000) 32- 33 I2 arcmin DEm Arcminute of Declination (J2000) 35- 36 I2 arcsec DEs Arcsecond of Declination (J2000) 38 A1 --- l_Sep [<] Upper limit flag on Sep 39- 44 F6.3 arcsec Sep [0.02/49.58] Separation ρ (1) 46- 48 I3 deg PA [32/354]? Position angle θ (1) 50- 53 I4 yr Year [2001/2016]? Date of the measurement 55- 60 A6 --- Tech Technique used to identify the binary (2) 62 I1 --- r_Tech [1/5] Reference for the separation measurement and the detection technique (3) 64- 67 F4.2 mag Dmag [0.1/6]? Magnitude difference between the components, where available (Δmag) 69- 73 A5 --- Flt Filter in which the measurement was made (either 754nm, H, IKC, or VJ) (4) 75 I1 --- r_Dmag [1/5]? Reference for the Δmag (3)
Note (1): Of the companion from the primary. Note (2): Codes for the techniques used to identify companions are as follows: astdet = Astrometric detection of a perturbation of the photocenter, as discussed in Section 5.1; astorb = Astrometric orbit; SB2 = Double-lined spectroscopic binary; spkdet = Detection using speckle interferometry; visdet = Visual detection. Note (3): The reference codes are defined as follows: 1 = This work; 2 = Bonfils et al. 2013 (Cat. J/A+A/549/A109); 3 = Forveille et al. 2005A&A...435L...5F; 4 = Horch et al. 2010 (Cat. J/AJ/139/205); 5 = Jao et al. 2003AJ....125..332J; 6 = Winters et al. 2011 (Cat. J/AJ/141/21). Note (4): The filters in which the Δmags were measured are either V or I on the Johnson-Kron-Cousins system, the filter at 754nm used on the DSSI speckle instrument, or the 2MASS H-band.
Byte-by-byte Description of file: table5.dat
Bytes Format Units Label Explanations
1- 13 A13 --- Name Name of the M dwarf 16- 17 I2 h RAh Hour of Right Ascension (J2000) 19- 20 I2 min RAm Minute of Right Ascension (J2000) 22- 25 F4.1 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 Arcminute of Declination (J2000) 34- 35 I2 arcsec DEs Arcsecond of Declination (J2000) 37- 40 F4.1 km/s Vtan [22.6/64.8] Tangential velocity 42- 53 A12 --- Youth Youth indicator (1)
Note (1): The youth indicators "GALEX" (Galaxy Evolution Explorer DR5 UV catalog; Bianchi et al. 2011, Cat. II/312) and "ROSAT" (ROentgen SATellite All Sky Survey X-ray catalog; Voges et al. 1999, Cat. IX/10; Voges et al. 2000, Cat. IX/29) indicate detections in each respective catalog, while "Tuc-Hor," "AB Dor," "Carina-Near," and "Argus" indicate the young nearby moving groups to which the star in question has a probability of belonging, based on its kinematic information.
Byte-by-byte Description of file: notes.dat
Bytes Format Units Label Explanations
1- 13 A13 --- Name Name of the M dwarf 14- 15 A2 --- m_Name Components of multiple system 17- 25 A9 --- OName Other name (first four digits of both the R.A. and decl.) 27-605 A579 --- Note Notes (figure numbers are listed if plots of the astrometry series are included in the paper)
Global Notes: Note (G1): If the names of the components are different, the letters identifying the primary and the secondary are placed within parentheses (e.g., LTT 7419(A) and CE 507(B), where the "B" component is also known as LTT 7419B).
History: From electronic version of the journal References: Henry et al., Paper I 1994AJ....108.1437H Kirkpatrick et al., Paper II 1995AJ....109..797K Simons et al., Paper III 1996AJ....112.2238S Henry et al., Paper IV 1997AJ....114..388H Patterson et al., Paper V 1998AJ....115.1648P Henry et al., Paper VI 2002AJ....123.2002H Jao et al., Paper VII 2003AJ....125..332J Hambly et al., Paper VIII 2004AJ....128..437H Golimowski et al., Paper IX 2004AJ....128.1733G Henry et al., Paper X 2004AJ....128.2460H Deacon et al., Paper XI 2005AJ....129..409D Subasavage et al., Paper XII 2005AJ....129..413S, Cat. J/AJ/129/413 Jao et al., Paper XIII 2005AJ....129.1954J Costa et al., Paper XIV 2005AJ....130..337C Subasavage et al., Paper XV 2005AJ....130.1658S, Cat. J/AJ/130/1658 Costa et al., Paper XVI 2006AJ....132.1234C Henry et al., Paper XVII 2006AJ....132.2360H Finch et al., Paper XVIII 2007AJ....133.2898F, Cat. J/AJ/133/2898 Subasavage et al., Paper XIX 2007AJ....134..252S, Cat. J/AJ/134/252 Subasavage et al., Paper XX 2008AJ....136..899S Subasavage et al., Paper XXI 2009AJ....137.4547S Riedel et al., Paper XXII 2010AJ....140..897R Winters et al., Paper XXIII 2011AJ....141...21W, Cat. J/AJ/141/21 Jao et al., Paper XXIV 2011AJ....141..117J Boyd et al., Paper XXV 2011AJ....142...10B, Cat. J/AJ/142/10 Riedel et al., Paper XXVI 2011AJ....142..104R Boyd et al., Paper XXVII 2011AJ....142...92B, Cat. J/AJ/142/92 Dieterich et al., Paper XXVIII 2012AJ....144...64D, Cat. J/AJ/144/64 Cantrell et al., Paper XXIX 2013AJ....146...99C Mamajek et al., Paper XXX 2013AJ....146..154M Jao et al., Paper XXXI 2014AJ....147...21J Dieterich et al., Paper XXXII 2014AJ....147...94D, Cat. J/AJ/147/94 Riedel et al., Paper XXXIII 2014AJ....147...85R, Cat. J/AJ/147/85 Lurie et al., Paper XXXIV 2014AJ....148...91L Winters et al., Paper XXXV 2015AJ....149....5W, Cat. J/AJ/149/5 Hosey et al., Paper XXXVI 2015AJ....150....6H, Cat. J/AJ/150/6 Benedict et al., Paper XXXVII 2016AJ....152..141B, Cat. J/AJ/152/141
(End) Sylvain Guehenneux [CDS] 13-Jul-2017
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