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J/A+A/493/L27   Parallaxes of 10 ultracool subdwarfs    (Schilbach+, 2009)

Trigonometric parallaxes of ten ultracool subdwarfs. Schilbach E., Roeser S., Scholz R.-D. <Astron. Astrophys., 493, L27-L30 (2009)> =2009A&A...493L..27S
ADC_Keywords: Stars, subdwarf ; Parallaxes, trigonometric ; Photometry, infrared ; Proper motions Keywords: astrometry - stars: distances - stars: kinematics - stars: low-mass, brown dwarfs - subdwarfs - solar neighborhood Abstract: We measure absolute trigonometric parallaxes and proper motions with respect to many background galaxies for a sample of ten ultracool subdwarfs. Observations were taken in the H-band with the OMEGA2000 camera on the 3.5 m-telescope at Calar Alto, Spain during a time period of 3.5-years. For the first time, the reduction of the astrometric measurements was carried out directly with respect to background galaxies. We obtained absolute parallaxes with mean errors ranging between 1 and 3mas. Description: The observations were made with the OMEGA2000 camera on the 3.5m-telescope of the Centro Astronomico Hispano Aleman (CAHA) at Calar Alto, Spain. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 59 10 Targets with previously known proper motions, JHKs photometry and spectral types table2.dat 135 10 Absolute parallaxes, absolute proper motions and infrared magnitudes of ultracool Subdwarfs
See also: J/AJ/124/1190 : Northern high proper motion stars in DSS (Lepine+, 2002) J/ApJ/564/421 : Spectra of T dwarfs. I. (Burgasser+, 2002) J/AJ/125/1598 : New high proper motion stars in the northern sky (Lepine+ 2003) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 15 A15 --- Name Name 16 A1 --- n_Name [*] Individual note on Name (1) 18- 23 F6.3 mag Jmag2 2MASS J magnitude 26- 31 F6.3 mag Hmag2 2MASS H magnitude 34- 39 F6.3 mag Ksmag2 2MASS Ks magnitude 42- 48 A7 --- SpType MK spectral type 50 A1 --- n_SpType [+] Note on SpType (1) 52- 53 I2 --- r_pm Proper motion reference (2) 55- 59 A5 --- r_SpType Spectral type reference (2)
Note (1): Notes as follows: * = Lepine et al. (2002, Cat. J/AJ/124/1190) listed an erroneous position and proper motion for this object + = Discovered by Lepine et al. (2003ApJ...591L..49L) as the first possible L subdwarf. Cushing & Vacca (2006AJ....131.1797C) described it as a very peculiar object (M6p/sdM), and Dahn et al. (2008ApJ...686..548D) recently found it to be an astrometric binary of the Galactic halo population consisting of a mildly metal-poor M dwarf and a substellar companion. Note (2): References as follows: 1 = Burgasser et al. (2002, Cat. J/ApJ/564/421) 2 = Lepine et al. (2003ApJ...591L..49L) 3 = Scholz et al. (2004A&A...425..519S) 4 = Sivarani et al. (2009ApJ...694L.140S) 5 = Burgasser et al. (2003ApJ...592.1186B) 6 = Burgasser (2004ApJ...614L..73B) 7 = Vrba et al. (2004AJ....127.2948V) 8 = Lepine et al. (2003ApJ...585L..69L) 9 = Lepine et al. (2003, Cat. J/AJ/125/1598) 10 = Scholz et al. (2004A&A...428L..25S) 11 = Burgasser et al. (2007ApJ...657..494B) 12 = Scholz et al. (unpublished, preliminary proper motion solution based on available SSS and 2MASS data)
Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 15 A15 --- Name Name 18- 26 F9.6 h RAhr Right ascension in decimal hours (J2000.0) (3) 28- 37 F10.6 deg DEdeg Declination in decimal degrees (J2000.0) (3) 39- 44 F6.2 mas plx Absolute trigonometric parallax 46- 50 F5.2 mas Dplx Applied correction converting the relative parallaxes to absolute ones (1) 52- 59 F8.2 mas/yr pmRA Absolute proper motion along RA, pmRA*cos(DE) 61- 68 F8.2 mas/yr pmDE Absolute proper motion along DE 70- 75 F6.3 mag Jmag J magnitude 77- 82 F6.3 mag Hmag H magnitude 84- 89 F6.3 mag Ksmag Ks magnitude 91- 95 F5.2 mag KsMAG Absolute Ks magnitude (2) 97- 99 I3 km/s Vt(LSR) Tangential velocity corrected for solar motion 101-104 F4.2 mas e_plx rms uncertainty on plx 106-109 F4.2 mas e_Dplx rms uncertainty on Dplx 111-114 F4.2 mas/yr e_pmRA rms uncertainty on pmRA 116-119 F4.2 mas/yr e_pmDE rms uncertainty on pmDE 121-122 I2 mmag e_Jmag rms uncertainty on Jmag 124 I1 mmag e_Hmag rms uncertainty on Hmag 126-127 I2 mmag e_Ksmag rms uncertainty on Ksmag 129-132 F4.2 mag e_KsMAG rms uncertainty on KsMAG 134-135 I2 km/s e_Vt(LSR) rms uncertainty on Vt(LSR)
Note (1): (plx(abs)=plx(rel)-Dplx) Note (2): computed from the corresponding trigonometric parallax and Ks. Note (3): Barycentric position for epoch J2000.
History: From electronic version of the journal
(End) Patricia Vannier [CDS] 28-Apr-2009
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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