| Issue |
A&A
Volume 428, Number 3, December IV 2004
|
|
|---|---|---|
| Page(s) | L25 - L28 | |
| Section | Letters | |
| DOI | https://doi.org/10.1051/0004-6361:200400098 | |
| Published online | 07 December 2004 | |
Letter to the Editor
SSSPM J1444-2019: An extremely high proper motion, ultracool subdwarf*
1
Astrophysikalisches Institut Potsdam, An der Sternwarte 16, 14482 Potsdam, Germany e-mail: rdscholz@aip.de
2
University of Leicester, Department of Physics & Astronomy, University Road, Leicester LE1 7RH, UK e-mail: nl41@star.le.ac.uk
3
University of Exeter, School of Physics, Stocker Road, Exeter EX4 4QL, UK e-mail: mjm@aip.de, mjm@astro.ex.ac.uk
Received:
19
October
2004
Accepted:
30
October
2004
We present the discovery of a new extreme high proper motion object
(~3.5 arcsec/year) which we classify as an ultracool subdwarf
with ![${\rm [M/H]} \sim -0.5$](/articles/aa/abs/2004/48/aagj192/aagj192_tex_eq1.png)
. It has
a formal spectral type of sdM9 but also shows L-type features: while the VO bands are completely absent, it exhibits extremely strong TiO absorption in
its optical spectrum. With a radial velocity of about -160 km s-1 and a
rough distance estimate of 16–24 pc, it is likely one of the nearest halo
members crossing the Solar neighbourhood with a heliocentric space velocity of
km s-1.
Key words: surveys / astrometry / stars: kinematics / stars: low-mass, brown dwarfs / subdwarfs / solar neighbourhood
© ESO, 2004
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