J/AJ/152/24 Trigonometric parallaxes of 134 low-mass stars (Weinberger+, 2016) ================================================================================ Trigonometric parallaxes and proper motions of 134 southern late M, L, and T dwarfs from the Carnegie Astrometric Planet Search program. Weinberger A.J., Boss A.P., Keiser S.A., Anglada-Escude G., Thompson I.B., Burley G. =2016AJ....152...24W (SIMBAD/NED BibCode) ================================================================================ ADC_Keywords: Stars, dwarfs ; Stars, nearby ; Proper motions ; Spectral types ; Parallaxes, trigonometric Keywords: astrometry - brown dwarfs - stars: low-mass Abstract: We report trigonometric parallaxes for 134 low-mass stars and brown dwarfs, of which 38 have no previously published measurement and 79 more have improved uncertainties. Our survey focused on nearby targets, so 119 are closer than 30pc. Of the 38 stars with new parallaxes, 14 are within 20pc and seven are likely brown dwarfs (spectral types later than L0). These parallaxes are useful for studies of kinematics, multiplicity, and spectrophotometric calibration. Two objects with new parallaxes are confirmed as young stars with membership in nearby young moving groups: LP 870-65 in AB Doradus and G161-71 in Argus. We also report the first parallax for the planet-hosting star GJ3470; this allows us to refine the density of its Neptune-mass planet. T-dwarf 2MASSJ12590470-4336243, previously thought to lie within 4pc, is found to be at 7.8pc, and the M-type star 2MASSJ01392170-3936088 joins the ranks of nearby stars as it is found to be within 10pc. Five stars that are overluminous and/or too red for their spectral types are identified and deserve further study as possible young stars. Description: CAPSCam operates on the 2.5-m du Pont telescope at the Las Campanas Observatory in Chile. CAPSCam has no internal moving parts and employs an astrometric quality filter as its window, which is approximately z band (865nm with a bandpass of 100nm). The field of view is 6.7arcmin on a side, with 2048*2048 pixels, each subtending 0.196''. File Summary: -------------------------------------------------------------------------------- FileName Lrecl Records Explanations -------------------------------------------------------------------------------- ReadMe 80 . This file table1.dat 110 134 *Observational information for CAPSCam targets with solved parallaxes table2.dat 124 134 Astrometric results -------------------------------------------------------------------------------- Note on table1.dat: CAPSCam operates on the 2.5-m du Pont telescope at the Las Campanas Observatory in Chile. -------------------------------------------------------------------------------- See also: II/328 : AllWISE Data Release (Cutri+ 2013) I/311 : Hipparcos, the New Reduction (van Leeuwen, 2007) II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003) III/198 : Palomar/MSU nearby star spectroscopic survey (Hawley+ 1997) 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/A+A/556/A110 : HARPS radial velocities of GJ 163 (Bonfils+, 2013) J/ApJ/752/56 : BDKP. III. Parallaxes for 70 ultracool dwarfs (Faherty+, 2012) J/ApJS/201/19 : Hawaii Infrared Parallax Program. I. (Dupuy+, 2012) J/AJ/137/1 : Proper motions of late-type dwarfs (Faherty+, 2009) J/AJ/136/452 : Astrometric studies of GAT stars (Gatewood, 2008) J/AJ/133/2825 : Star beyond the NLTT catalog (Reid+, 2007) J/A+A/446/515 : Distances of nearby ultracool dwarfs (Phan-Bao+, 2006) J/AJ/132/866 : New M dwarfs in solar neighborhood (Riaz+, 2006) J/A+A/442/211 : Spectroscopic distances of 322 NLTT stars (Scholz+, 2005) J/A+A/441/653 : 32 DENIS nearby red dwarfs (Crifo+, 2005) J/A+A/440/1061 : Southern red high proper motion objects (Lodieu+, 2005) J/A+A/435/363 : Southern Infrared Proper Motion Survey (Deacon+, 2005) J/PASP/117/676 : LHS faint proper-motion stars (Reid+, 2005) J/AJ/126/3007 : Spectroscopy of faint red NLTT dwarfs (Reid+, 2003) J/AJ/123/2828 : Spectroscopy of northern NLTT stars (Cruz+, 2002) J/AJ/108/2338 : Photographic astrometry. VIII. (Heintz 1994) J/AJ/105/1571 : USNO Photographic Parallaxes IX (Harrington+ 1993) Byte-by-byte Description of file: table1.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 13 A13 --- Name Target identifier 15- 16 I2 h RAh Hour of Right Ascension (J2000) 18- 19 I2 min RAm Minute of Right Ascension (J2000) 21- 25 F5.2 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- 37 F4.1 arcsec DEs Arcsecond of Declination (J2000) 39- 44 A6 --- SpT Spectral type, visual wavelength where available 46- 47 A2 --- r_SpT Reference for SpT (1) 49- 51 I3 s tFF [20/240] Full Field integration time (t_int,FF_) (2) 53- 56 F4.1 s tGW [0.2/30]? Guide Window integration time (t_int,GW_) (2) 58- 59 I2 --- Nr [6/57] Number of reference stars 61- 62 I2 --- Ne [4/28] Number of epochs 64- 72 F9.1 d JD0 Julian Date of the observation start 74- 82 F9.1 d JD1 Julian Date of the observation end 84- 86 F3.1 yr dT [1.1/8] Time between start and end of observation ({Delta}t) 88- 93 F6.3 mag Jmag [6.6/15.4] 2MASS J band magnitude (m_J_) 95- 99 F5.3 mag e_Jmag [0.017/0.051] Uncertainty in Jmag ({sigma}m_J_) 101-105 F5.2 mag [3.4] [5.7/15]? The 3.4{mu}m band (W1) magnitude from AllWISE catalog (Cutri et al. 2013, Cat. II/328) 107-110 F4.2 mag e_[3.4] [0.02/0.14]? Uncertainty in [3.4] ({sigma}m_W1_) -------------------------------------------------------------------------------- Note (1): Reference codes for the spectral types are defined as follows: 1 = Reid et al. 1995 (Cat. III/198); 2 = Faherty et al. 2009 (Cat. J/AJ/137/1); 3 = Kendall et al. (2007MNRAS.374..445K); 4 = Phan-Bao & Bessell 2006 (Cat. J/A+A/446/515); 5 = Hawley et al. 1996 (Cat. III/198); 6 = Cruz & Reid 2002 (Cat. J/AJ/123/2828); 7 = Reid et al. 2003 (Cat. J/AJ/126/3007); 8 = Riaz et al. 2006 (Cat. J/AJ/132/866); 9 = Bonfils et al. 2013 (Cat. J/A+A/556/A110); 10 = Bowler et al. (2010ApJ...710...45B); 11 = Crifo et al. 2005 (Cat. J/A+A/441/653); 12 = Reid & Gizis 2005 (Cat. J/PASP/117/676); 13 = Marshall 2008 (2008AJ....135.1000M); 14 = Scholz et al. 2005 (Cat. J/A+A/442/211); 15 = Lodieu et al. 2005 (Cat. J/A+A/440/1061); 16 = Reid et al. 2007 (Cat. J/AJ/133/2825). Note (2): The field of view is 6.7' on a side, with 2048*2048 pixels, each subtending 0.196''. A subarray, also known as the "guide window," is arbitrarily sizable and locatable and may be read out independently from the rest of the field. A bright target star is placed in the guide window, which is then read out fast enough so the star does not saturate while the rest of the pixels integrate on the reference stars; a mechanical shutter in front of the entrance window ensures that the exposure time on the bright star remains as commensurate as possible with that on the full field. Thus, the camera can achieve high dynamic range without excessive overhead. -------------------------------------------------------------------------------- Byte-by-byte Description of file: table2.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 13 A13 --- Name Target identifier 15- 16 I2 h RAh Hour of Right Ascension (J2000) 18- 19 I2 min RAm Minute of Right Ascension (J2000) 21- 25 F5.2 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- 37 F4.1 arcsec DEs Arcsecond of Declination (J2000) 39- 44 F6.2 mas plx [9.1/412.5] Relative trigonometric parallax ({pi}_rel_) 46- 50 F5.2 mas e_plx [0.2/11.4] Uncertainty in plx ({sigma}{pi}_rel_) 52- 56 F5.2 mas ZPt [-8.4/6.8] Zero point parallax correction 58- 61 F4.2 mas e_ZPt [0/2.5] Uncertainty in ZPt ({sigma}_ZPt_) 63- 68 F6.2 mas PLX [12.3/418.9]? Literature trigonometric parallax ({pi}_Lit._) (3) 70- 74 F5.2 mas e_PLX [0.28/41]? Uncertainty in PLX ({sigma}{pi}_Lit_) 76- 82 A7 --- r_PLX Reference(s) for PLX (4) 84- 91 F8.2 mas/yr pmRA [-3808.1/3955.6] Relative proper motion along Right Ascension ({mu}_RA_*cos{delta}) 93- 96 F4.2 mas/yr e_pmRA [0.1/6] Relative uncertainty in pmRA ({sigma}{mu}_RA_) 98-105 F8.2 mas/yr pmDE [-5045/1595] Relative proper motion along Declination ({mu}_{delta}_) 107-111 F5.2 mas/yr e_pmDE [0.11/12.85] Relative uncertainty in pmDE ({sigma}{mu}_{delta}_) 113-118 F6.2 mas Plx [8.6/413.2] Final absolute trigonometric parallax ({pi}_abs_) 120-124 F5.2 mas e_Plx [0.31/11.4] Uncertainty in Plx ({sigma}{pi}_abs_) -------------------------------------------------------------------------------- Note (3): Literature parallaxes are weighted averages when more than one value exists. Note (4): Reference codes for the literature parallax are defined as follows: 1 = van Altena et al. (1995gcts.book.....V); 2 = Tinney et al. (1995AJ....110.3014T); 3 = Costa et al. (2005AJ....130..337C); 4 = Harrington & Dahn (1980AJ.....85..454H); 5 = Dahn et al. (1988AJ.....95..237D); 6 = Dahn et al. (2002AJ....124.1170D); 7 = Dahn et al. (1982AJ.....87..419D); 8 = Henry et al. (2006AJ....132.2360H); 9 = Costa et al. (2006AJ....132.1234C); 10 = Riedel et al. (2010AJ....140..897R); 11 = Faherty et al. 2012 (Cat. J/ApJ/752/56); 12 = Tinney (1996MNRAS.281..644T); 13 = Dieterich et al. 2014 (Cat. J/AJ/147/94); 14 = Vrba et al. (2004AJ....127.2948V); 15 = Riedel et al. 2014 (Cat. J/AJ/147/85); 16 = Marocco et al. (2013AJ....146..161M); 17 = Gatewood et al. 2008 (Cat. J/AJ/136/452); 18 = Riedel et al. (2011AJ....142..104R); 19 = Andrei et al. (2011AJ....141...54A); 20 = Heintz 1994 (Cat. J/AJ/108/2338); 21 = Ianna & Fredrick (1995ApJ...441L..47I); 22 = Anglada-Escude et al. (2012ApJ...746...37A); 23 = Smart et al. (2010A&A...514A..84S); 24 = Jao et al. (2005AJ....129.1954J); 25 = Jao et al. (2011AJ....141..117J); 26 = Deacon & Hambly (2001A&A...380..148D); 27 = van Leeuwen 2007 (Cat. I/311); 28 = Harrington et al. 1993 (Cat. J/AJ/105/1571); 29 = Deacon et al. 2005 (Cat. J/A+A/435/363); 30 = Dupuy & Liu 2012 (Cat. J/ApJS/201/19); 31 = Pravdo & Shaklan (2009ApJ...700..623P); 32 = Mamajek et al. (2013AJ....146..154M). -------------------------------------------------------------------------------- History: From electronic version of the journal ================================================================================ (End) Prepared by [AAS]; Sylvain Guehenneux [CDS] 14-Sep-2016