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J/MNRAS/454/4054    High proper motion sources from WISE     (Beamin+, 2015)

Spectrophotometric characterization of high proper motion sources from WISE. Beamin J.C., Ivanov V.D., Minniti D., Smart R.L., Muzic K., Mendez R.A., Beletsky Y., Bayo A., Gromadzki M., Kurtev R. <Mon. Not. R. Astron. Soc., 454, 4054-4065 (2015)> =2015MNRAS.454.4054B (SIMBAD/NED BibCode)
ADC_Keywords: Stars, faint ; Proper motions ; Photometry Keywords: techniques: spectroscopic - astrometry - parallaxes - brown dwarfs - stars: low-mass Abstract: The census of the solar neighbourhood is almost complete for stars and becoming more complete in the brown dwarf regime. Spectroscopic, photometric and kinematic characterization of nearby objects helps us to understand the local mass function, the binary fraction, and provides new targets for sensitive planet searches. We aim to derive spectral types and spectrophotometric distances of a sample of new high proper motion sources found with the WISE (Wide-field Infrared Survey Explorer) satellite, and obtain parallaxes for those objects that fall within the area observed by the Vista Variables in the Via Lactea survey (VVV). We used low-resolution spectroscopy and template fitting to derive spectral types, multiwavelength photometry to characterize the companion candidates and obtain photometric distances. Multi-epoch imaging from the VVV survey was used to measure the parallaxes and proper motions for three sources. We confirm a new T2 brown dwarf within ∼15pc. We derived optical spectral types for 24 sources, mostly M dwarfs within 50pc. We addressed the wide binary nature of 16 objects found by the WISE mission and previously known high proper motion sources. Six of these are probably members of wide binaries, two of those are new, and present evidence against the physical binary nature of two candidate binary stars found in the literature, and eight that we selected as possible binary systems. We discuss a likely microlensing event produced by a nearby low-mass star and a galaxy, that is to occur in the following five years. Description: The ESO Faint Object Spectrograph and Camera v.2 (EFOSC2) mounted at the 3.6-m New Technology Telescope (NTT) at la Silla observatory, is a versatile instrument for low-resolution spectroscopy, imaging and polarimetry. We obtained low-resolution long-slit spectra for 24 sources (see Table 1) using the same configuration for all the sources: 1 arcsec slit width, grism number one, covering a spectral range of λ=3185-10940Å with a resolution ∼48Å. All the sources were observed on 2014 April 17. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 55 25 Sample of WISE high PM objects selected for spectroscopic follow-up with the EFOSC2 at the NTT at La Silla observatory, and FIRE at Baade at Las Campanas observatory table3.dat 374 38 Archival photometry for sources selected for EFOSC2 spectroscopy and candidate companions table4.dat 108 25 Spectral classification and spectrophotometric distances for the stars observed with EFOSC2@NTT table5.dat 122 14 Binary/multiple system investigated in this paper
See also: B/denis : The DENIS database (DENIS Consortium, 2005) I/284 : The USNO-B1.0 Catalog (Monet+ 2003) I/305 : The Guide Star Catalog, Version 2.3.2 (GSC2.3) (STScI, 2006) I/322 : UCAC4 Catalogue (Zacharias+, 2012) I/327 : Carlsberg Meridian Catalog 15 (CMC15) (CMC, 2011) II/337 : VISTA Variables in the Via Lactea Survey DR1 (Minniti+, 2014) II/311 : WISE All-Sky Data Release (Cutri+ 2012) V/139 : The SDSS Photometric Catalog, Release 9 (Adelman-McCarthy+, 2012) VII/233 : The 2MASS Extended sources (IPAC/UMass, 2003-2006) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 24 A24 --- Name Name (2MASS or WISE) 26- 27 I2 h RAh Right ascension (J2000) 29- 30 I2 min RAm Right ascension (J2000) 32- 36 F5.2 s RAs Right ascension (J2000) 38 A1 --- DE- Declination sign (J2000) 39- 40 I2 deg DEd Declination (J2000) 42- 43 I2 arcmin DEm Declination (J2000) 45- 48 F4.1 arcsec DEs Declination (J2000) 50- 55 A6 --- ExpTime Exposure time (in seconds)
Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
1- 23 A23 --- Name Name from 2MASS point source catalogue 25- 27 A3 --- Spectra [yes/no ] Spectroscopy available for this object? 29- 34 F6.3 mag Bmag ?=- B magnitude from GSC2.3 or USNO-B1 36- 41 F6.3 mag Vmag ?=- V magnitude from GSC2.3 or USNO-B1 43- 48 F6.3 mag Rmag ?=- R magnitude from GSC2.3 or USNO-B1 49- 53 F5.2 mag Imag ?=- I magnitude from Super Cosmos IIVN 55- 60 F6.3 mag Rmag2 ?=- Old R magnitude from UCAC4 62- 67 F6.3 mag J2mag ?=- 2MASS J magnitude 69- 73 F5.3 mag e_J2mag ?=- Error in J2mag 75- 80 F6.3 mag H2mag ?=- 2MASS H magnitude 82- 86 F5.3 mag e_H2mag ?=- Error in H2mag 88- 93 F6.3 mag Ks2mag ?=- 2MASS KS magnitude 95- 99 F5.3 mag e_Ks2mag ?=- Error in KS2mag 101-106 F6.3 mag W1mag ?=- WISE W1 magnitude 108-112 F5.3 mag e_W1mag ?=- Error in W1mag 114-119 F6.3 mag W2mag ?=- WISE W2 magnitude 121-125 F5.3 mag e_W2mag ?=- Error in W2mag 127-132 F6.3 mag W3mag ?=- WISE W3 magnitude 134-138 F5.3 mag e_W3mag ?=- Error in W3mag 140-144 F5.3 mag W4mag ?=- WISE W4 magnitude 146-150 F5.3 mag e_W4mag ?=- Error in W4mag 152-157 F6.3 mag IDmag ?=- DENIS I magnitude 159-162 F4.2 mag e_IDmag ?=- Error in IDmag 164-169 F6.3 mag JDmag ?=- DENIS I magnitude 171-174 F4.2 mag e_JDmag ?=- Error in JDmag 176-181 F6.3 mag KsDmag ?=- DENIS I magnitude 183-186 F4.2 mag e_KsDmag ?=- Error in KSDmag 188-193 F6.3 mag umag ?=- SDSS DR9 u magnitude 195-199 F5.3 mag e_umag ?=- Error in umag 201-206 F6.3 mag gmag ?=- SDSS DR9 g magnitude 208-212 F5.3 mag e_gmag ?=- Error in gmag 214-219 F6.3 mag rmag ?=- SDSS DR9 r or new UCAC4 r or CMC15 r magnitude (1) 221-225 F5.3 mag e_rmag ?=- Error in rmag 227-232 F6.3 mag imag ?=- SDSS DR9 i or new UCAC4 i magnitude (1) 234-238 F5.3 mag e_imag ?=- Error in imag 240-245 F6.3 mag zmag ?=- SDSS DR9 z magnitude 247-251 F5.3 mag e_zmag ?=- Error in zmag 253-258 F6.3 mag YUmag ?=- UKIDSS Y magnitude 260-264 F5.3 mag e_YUmag ?=- Error in YUmag 266-271 F6.3 mag JUmag ?=- UKIDSS J magnitude 273-277 F5.3 mag e_JUmag ?=- Error in JUmag 279-284 F6.3 mag HUmag ?=- UKIDSS H magnitude 286-290 F5.3 mag e_HUmag ?=- Error in HUmag 292-297 F6.3 mag KUmag ?=- UKIDSS K magnitude 300-304 F5.3 mag e_KUmag ?=- Error in KUmag 306-312 F7.4 mag ZVmag ?=- VVV DR3 Z magnitude 314-319 F6.4 mag e_ZVmag ?=- Error in ZVmag 321-327 F7.4 mag YVmag ?=- VVV DR3 Y magnitude 329-334 F6.4 mag e_YVmag ?=- Error in YVmag 335-341 F7.4 mag JVmag ?=- VVV DR3 J magnitude 342-347 F6.4 mag e_JVmag ?=- Error in JVmag 348-354 F7.4 mag HVmag ?=- VVV DR3 H magnitude 355-360 F6.4 mag e_HVmag ?=- Error in HVmag 361-367 F7.4 mag KsVmag ?=- VVV DR3 Ks magnitude 369-374 F6.4 mag e_KsVmag ?=- Error in KsVmag
Note (1): for magnitudes from UCAC4 transformed to SDSS r and i filters, we assume a fixed error of 0.3 mag. for magnitudes from CMC15, the catalogue mentions they use an SDSS r filter, we assumed 0.1 errors (see discussion of errors in the text).
Byte-by-byte Description of file: table4.dat
Bytes Format Units Label Explanations
1- 23 A23 --- Name Name from 2MASS point source catalogue 25- 34 A10 --- SpType MK spectral type 38- 41 I4 K Teff SED effective temperature 43- 48 F6.3 mag Jmag 2MASS J magnitude 50- 55 F6.1 mas/yr pmRA Proper motion along RA, pmRA*cosDE 57- 59 F3.1 mas/yr e_pmRA ? rms uncertainty on pmRA 61- 66 F6.1 mas/yr pmDE Proper motion along DE 68- 70 F3.1 mas/yr e_pmDE ? rms uncertainty on pmDE 73- 77 F5.1 pc Dist1 ?=- First distance from litterature 78 A1 --- n_Dist1 [cbd] Note for Dist (1) 80- 81 I2 pc Dist2 ? Seconde distance from litterature 82 A1 --- n_Dist2 [b] Note for Dist2 (1) 84- 85 I2 pc Dist3 ? Third distance from litterature 86 A1 --- n_Dist3 [b] Note for Dist3 (1) 88- 92 F5.1 pc Dist Distance from this work (2) 94- 96 F3.1 pc E_Dist ? Error on Dist (upper value) 98-100 F3.1 pc e_Dist ? Error on Dist (lower value) 102-107 A6 --- Ref Reference for proper motion and litterature distance (3) 108 A1 --- Note [a] Note (4)
Note (1): Notes as follows: b = Photometric distance (spectral type derived from Teff using the relations in Pecaut & Mamajek (2013, Cat. J/ApJS/208/9) and online table maintained by E. Mamajek, http://www.pas.rochester.edu/~emamajek/EEM_dwarf_UBVIJHK_colors_Teff.txt) c = Parallax distance d = The paper cites the value for other object of the system (SIPS 1910-4133A) and is from photographic plates, our measurement is for SIPS 1910-4133B. Note (2): The photometric distance error from this work are ~<20 per cent. Note (3): The values of PM and distances with quoted errors were fitted from VVV data references as follows: 1 = Luhman (2014, Cat. J/ApJ/781/4) 2 = Winters et al. (2015, Cat. J/AJ/149/5) 3 = Salim & Gould (2003, Cat. J/ApJ/582/1011) 4 = Finch et al. (2007, Cat. J/AJ/133/2898) 5 = Luyten & Hughes (1980, Proper Motion Survey with the Forty-Eight Inch Schmidt Telescope 1980 MN, USA Univ. Minnesota) 6 = Subasavage et al. (2005, Cat. J/AJ/129/413) 7 = Lepine & Shara (2005AJ....129.1483L, Cat. I/298) 8 = Ammons et al. (2006ApJ...638.1004A, Cat. V/136) 9 = Fresneau, Vaughan & Argyle (2007, Cat. J/A+A/469/1221) 10 = Pickles & Depagne (2010PASP..122.1437P, Cat. VI/135) TW = this work Note (4): a = We recalculated the PM using 2MASS and the WISE ALL-SKY epoch position with the highest S/N, as we find that the Salim & Gould (2003, Cat. J/ApJ/582/1011) value for PM of LP 721-15 is inconsistent with the motion of the sources in the images, this object could be an unresolved binary, and then located furher away, see text for discussion.
Byte-by-byte Description of file: table5.dat
Bytes Format Units Label Explanations
1- 23 A23 --- Name Star 2MASS ID 25- 28 A4 --- SpType Spectral type from this work and from literature spectra 30 I1 --- r_SpType ? Reference for SpType (1) 33- 36 I4 K Teff ? Effective temperature based on photometric spectral energy distribution 38 I1 --- r_Teff ? Reference for Teff (1) 41- 46 F6.3 mag J2mag ? 2MASS J magnitude 48- 53 F6.2 arcsec rho ? Angular separation 54- 58 A5 --- n_rho Note on rho 59 A1 --- l_Dist [~] Limit flag on Dist 60- 65 F6.2 pc Dist ? Photometric distance, except for the labelled objects which have parallaxes 67- 69 F3.1 pc E_Dist ? Error on Dist (upper value) 71- 73 F3.1 pc e_Dist ? Error on Dist (lower value) 75 I1 --- r_Dist ? Reference for Dist (1) 77- 83 F7.2 mas pmRA ? Proper motion along Ra (pmRA*cosDE) 85- 87 F3.1 mas e_pmRA ? rms uncertainty on pmRA 89 I1 --- r_pmRA ? Reference for pmRA (1) 92- 97 F6.1 mas pmDE ? Proper motion along DE 99-101 F3.1 mas e_pmDE ? rms uncertainty on pmDE 103 I1 --- r_pmDE ? Reference for pmDE 106-122 A17 --- Rem Remarks (2)
Note (1): References as follows: 1 = Hawley, Gizis & Reid (1996AJ....112.2799H, Cat. III/198) 2 = van Altena, Lee & Hoffleit (1995, Cat. I/238) 3 = Luhman (2014, Cat. J/ApJ/781/4) 4 = Kirkpatrick et al. (2014ApJ...783..122K) 5 = Deacon et al. (2005, Cat. J/A+A/435/363) 6 = Winters et al. (2015, Cat. J/AJ/149/5) 7 = Houdebine (2010, Cat. J/MNRAS/407/1657) The values without reference were calculated or derived in this work, the photometric distances have a ≲20 per cent error (spectral type and effective temperature uncertainties are the main source of error). Note (2): (1) = from Hawley, Gizis & Reid (1996AJ....112.2799H, Cat. III/198)
History: From electronic version of the journal
(End) Patricia Vannier [CDS] 22-Jul-2016
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