2009A&A...493L..27S


C.D.S. - SIMBAD4 rel 1.7 - 2021.04.19CEST03:01:45

2009A&A...493L..27S - Astronomy and Astrophysics, volume 493, L27-30 (2009/1-2)

Trigonometric parallaxes of ten ultracool subdwarfs.

SCHILBACH E., ROESER S. and SCHOLZ R.-D.

Abstract (from CDS):

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 3 mas. With six completely new parallaxes we more than doubled the number of benchmark ultracool (>sdM7) subdwarfs. Six stars in the MKs vs. J-Ks diagram fit perfectly to model subdwarf sequences from M7 to L4 with [M/H] between -1.0 and -1.5, whereas 4 are consistent with a moderately low metallicity ([M/H]=-0.5) from M7 to T6. All but one of our objects have large tangential velocities between 200 and 320km/s typical of the Galactic halo population. Our results are in good agreement with recent independent measurements for three of our targets and confirm the previously measured parallax and absolute magnitude MKs of the nearest and coolest (T-type) subdwarf 2MASS 0937+29 with higher accuracy. For all targets, we also obtained infrared J,H,Ks photometry at a level of a few milli-magnitudes relative to 2MASS standards.

Abstract Copyright:

Journal keyword(s): astrometry - stars: distances - stars: kinematics - stars: low-mass, brown dwarfs - subdwarfs - solar neighborhood

VizieR on-line data: <Available at CDS (J/A+A/493/L27): table1.dat table2.dat>

CDS comments: Table 1 SDSS 1256-0224 is 2MASS J12563716-0224522 in Simbad.

Simbad objects: 11

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Number of rows : 11

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 2MASS J05325346+8246465 BD* 05 32 54.4385958315 +82 46 45.174215154           esdL7 55 0
2 2MASSI J0937347+293142 BD* 09 37 34.87968 +29 31 40.9908           T6 80 0
3 SSSPM J1013-1356 LM* 10 13 07.3466815701 -13 56 21.261098713       18.73 16.01 sdM9.5 35 0
4 SSSPM J1256-1408 PM* 12 56 14.0124788330 -14 08 40.418424441           sdM9 7 0
5 2MASS J12563716-0224522 BD* 12 56 37.1381711583 -02 24 52.253650704           esdL3.5 33 0
6 LSPM J1425+7102 LM* 14 25 05.0227940507 +71 02 09.678947111   20.8   18.61 16.21 sdM8 29 0
7 LP 440-52 LM* 14 39 00.3087274496 +18 39 38.704121134   19.6 18.39 17.3 14.64 sdM7 60 0
8 SSSPM J1444-2019 PM* 14 44 20.67432 -20 19 22.2708       18.57 14.97 M9.0VI: 25 0
9 LSR J1610-0040 LM* 16 10 28.9562440851 -00 40 53.300190959       17.51 14.81 sdM6.5 48 0
10 2MASS J16262034+3925190 BD* 16 26 20.1331562643 +39 25 19.489643721       19.67 16.68 esdL4 44 0
11 LSPM J2036+5100 LM* 20 36 21.6141972503 +51 00 04.698980889       17.46 15.26 sdM7.5 24 1

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2021.04.19-03:01:45

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