Volume 428, Number 3, December IV 2004
|Page(s)||L25 - L28|
|Published online||07 December 2004|
Letter to the Editor
SSSPM J1444-2019: An extremely high proper motion, ultracool subdwarf*
Astrophysikalisches Institut Potsdam, An der Sternwarte 16, 14482 Potsdam, Germany e-mail: firstname.lastname@example.org
2 University of Leicester, Department of Physics & Astronomy, University Road, Leicester LE1 7RH, UK e-mail: email@example.com
3 University of Exeter, School of Physics, Stocker Road, Exeter EX4 4QL, UK e-mail: firstname.lastname@example.org, email@example.com
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 . 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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