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J/AJ/144/62  Tertiary companions to close spectroscopic binaries  (Allen+, 2012)

Low-mass tertiary companions to spectroscopic binaries. I. Common proper motion survey for wide companions using 2MASS. Allen P.R., Burgasser A.J., Faherty J.K., Kirkpatrick J.D. <Astron. J., 144, 62 (2012)> =2012AJ....144...62A
ADC_Keywords: Binaries, spectroscopic ; Stars, dwarfs ; Proper motions ; Spectral types ; Parallaxes, trigonometric Keywords: astrometry - binaries: general - brown dwarfs - stars: low-mass Abstract: We report the first results of a multi-epoch search for wide (separations greater than a few tens of AU), low-mass tertiary companions of a volume-limited sample of 118 known spectroscopic binaries within 30pc of the Sun, using the Two Micron All Sky Survey Point Source Catalog and follow-up observations with the KPNO and CTIO 4m telescopes. Note that this sample is not volume complete but volume limited, and, thus, there is incompleteness in our reported companion rates. We are sensitive to common proper motion companions with separations from roughly 200AU to 10000AU (∼10"--≳10'). From 77 sources followed-up to date, we recover 11 previously known tertiaries, 3 previously known candidate tertiaries, of which 2 are spectroscopically confirmed and 1 rejected, and 3 new candidates, of which 2 are confirmed and 1 rejected. This yields an estimated wide tertiary fraction of 19.5+5.2-3.7%. This observed fraction is consistent with predictions set out in star formation simulations where the fraction of wide, low-mass companions to spectroscopic binaries is >10%. Description: The sample was selected from "The Ninth Catalogue of Spectroscopic Binaries" (Pourbaix et al. 2004; Cat. B/sb9). We ran the full catalog of 2386 binaries through the Vizier interface of the Hipparcos catalog (Cat. I/239) to determine the distance and proper motion of each object (Table 1). We used the 2MASS Point Source Catalog (Cutri et al. 2003, Cat. II/246), which was taken between 1997 and 2001, to provide the first epoch. Second epoch near-infrared imaging was conducted with the KPNO 4m Flamingos and CTIO 4m ISPI instruments. The observations were carried out during four successful observing runs: 2007 May 3-6 (KPNO), 2007 June 3-6 (CTIO), 2008 January 20-23 (CTIO), and 2008 January 28-30 (KPNO). File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 112 118 Spectroscopic binary target list table2.dat 122 18 Candidate and known common proper motion (CPM) companions
See also: B/sb9 : 9th Catalogue of Spectroscopic Binary Orbits (Pourbaix+ 2004-2013) V/130 : Geneva-Copenhagen Survey of Solar neighbourhood III (Holmberg+, 2009) I/298 : LSPM-North Catalog (Lepine+ 2005) II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003) I/274 : Catalog of Components of Double & Multiple stars (Dommanget+ 2002) I/239 : The Hipparcos and Tycho Catalogues (ESA 1997) III/198 : Palomar/MSU nearby star spectroscopic survey (Hawley+ 1997) J/A+A/525/A95 : Search for brown-dwarf companions of stars (Sahlmann+, 2011) J/ApJS/190/100 : NIR proper motion survey using 2MASS (Kirkpatrick+, 2010) J/AJ/139/2566 : SLoWPoKES catalog (Dhital+, 2010) J/ApJS/181/62 : Survey of young solar analogs (Metchev+, 2009) J/AJ/137/1 : PMs and astrometry of late-type dwarfs (Faherty+, 2009) J/MNRAS/394/857 : UKIDSS-2MASS proper motion survey (Deacon+, 2009) J/A+A/450/681 : Companions to close spectroscopic binaries (Tokovinin+, 2006) J/AJ/126/3007 : Spectroscopy of faint red NLTT dwarfs (Reid+, 2003) J/AJ/121/2189 : Stars within 8pc of the Sun (Oppenheimer+, 2001) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 6 I6 --- HIP [171/117712] Hipparcos Number 8- 9 I2 h RAh Hour of Right Ascension (J2000) 11- 12 I2 min RAm Minute of Right Ascension (J2000) 14- 18 F5.2 s RAs Second of Right Ascension (J2000) 20 A1 --- DE- Sign of the Declination (J2000) 21- 22 I2 deg DEd Degree of Declination (J2000) 24- 25 I2 arcmin DEm Arcminute of Declination (J2000) 27- 30 F4.1 arcsec DEs Arcsecond of Declination (J2000) 32- 37 F6.2 mas plx [33/380] Parallax (1) 39- 42 F4.2 mas e_plx [0.4/7.7] Uncertainty in plx 44- 50 F7.2 mas/yr pmRA [-717/1152] Proper motion along RA (1) 52- 55 F4.2 mas/yr e_pmRA [0.3/7] Uncertainty in pmRA 57- 64 F8.2 mas/yr pmDE [-1224/714] Proper motion along DE (1) 66- 69 F4.2 mas/yr e_pmDE [0.3/7] Uncertainty in pmDE 71- 79 F9.3 d Per [0.2/70127] Period of the spectroscopic binary (2) 81- 85 F5.2 mag Vmag [-1.5/11.5] V band magnitude (2) 87- 94 A8 --- SpT MK spectral type (2) 96-107 A12 "D:M:Y" Date ? UT date of the observation 109-112 A4 --- Tel Telescope used (CTIO=Cerro Tololo or KPNO=Kitt Peak Obs.)
Note (1): Derived from the Hipparcos database (Perryman et al. 1997, I/239). Note (2): From the Ninth Catalog of Spectroscopic Binaries (Pourbaix et al. 2004, Cat. B/sb9).
Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 6 I6 --- HIP [13081/111802] Hipparcos number 8- 9 I2 h RAh Tertiary hour of right ascension (J2000) from 2MASS 11- 12 I2 min RAm Tertiary minute of right ascension (J2000) 14- 17 F4.1 s RAs Tertiary second of right ascension (J2000) 19 A1 --- DE- Tertiary sign of declination (J2000) from 2MASS 20- 21 I2 deg DEd Tertiary degree of declination (J2000) from 2MASS 23- 24 I2 arcmin DEm Tertiary arcminute of declination (J2000) 26- 27 I2 arcsec DEs Tertiary arcsecond of declination (J2000) 29- 34 F6.1 mas/yr pmRA [-566/444] Proper motion along RA (1) 36- 37 I2 mas/yr e_pmRA [24/48] pmRA uncertainty (1) 39- 44 F6.1 mas/yr pmDE [-632/280] Proper motion along DEC (1) 46- 47 I2 mas/yr e_pmDE [28/44] pmDE uncertainty (1) 49- 52 I4 AU Sep [200/9640]? Separation 54- 59 F6.3 mag JMag [4/15]? Absolute J-magnitude (2) 61- 65 F5.3 mag e_JMag [0.01/0.2]? JMag uncertainty (2) 67- 72 F6.3 mag J-Ks [-0.008/1.8]? 2MASS PSC J-Ks color index 74- 78 F5.3 mag e_J-Ks [0.02/0.3]? J-Ks uncertainty 80- 84 F5.3 mag J-H [0.1/1.2]? 2MASS PSC J-H color index 86- 90 F5.3 mag e_J-H [0.02/0.3]? J-H uncertainty 92- 97 F6.3 mag H-Ks [-0.4/0.6]? 2MASS PSC K-Ks color index 99-103 F5.3 mag e_H-Ks [0.02/0.3]? H-Ks uncertainty 105-108 A4 --- SpT Tertiary MK spectral type (3) 110-114 A5 --- SpTI Primary MK spectral type 116 I1 --- Note [1/5] Note (4) 118 A1 --- r_SpT Reference for SpT (5) 120-122 A3 --- Status Companion status (Yes/No)
Note (1): Listed proper motion measurements are derived from the data presented in this paper save for those objects with a "5" in the "Note" column. Those values were taken from Hipparcos, as those objects were saturated in our data. Note (2): Absolute J magnitudes derived from 2MASS photometry and Hipparcos parallaxes. Note (3): Companion spectral types were based either on SpeX prism spectroscopy obtained for this work (objects with "2" or "3" in the Note column) or were already known in which case the spectral type listed is from the paper referenced by the lettered superscripts in the r_Note column (objects with "1" or "5" in the Note column). Note (4): Note as follows: 1 = Previously known companion, no additional follow-up data required. 2 = Previously known candidate companion, no Spectral Type, SpeX data acquired. 3 = No previous data, SpeX data acquired. 4 = Additional photometry acquired from Vizier database, not a companion. 5 = Previously known bright companion. Saturated in these data, found via literature search using the SIMBAD database. Note (5): Reference for the companion spectral type as follows: e = Reid et al. (1995, Cat. III/198). f = Tokovinin et al. (2006, Cat. J/A+A/450/681). g = Makarov et al. (2008ApJ...687..566M). h = Joy & Sanford (1926ApJ....64..250J). i = Reid et al. (2003, Cat. J/AJ/126/3007). j = Close et al. (1990AJ....100.1968C). k = Wilson et al. (2001AJ....122.1989W). l = Gizis et al. (2001ApJ...551L.163G). m = Dommanget & Nys (2002, Cat. I/274).
History: From electronic version of the journal
(End) Greg Schwarz [AAS], Sylvain Guehenneux [CDS] 09-Oct-2013
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