SSSPM J1444-2019: An extremely high proper motion, ultracool subdwarf

Bibcode
2004A&A...428L..25S
DOI
10.1051/0004-6361:200400098
Scholz, R.-D.; Lodieu, N.; McCaughrean, M. J.
Bibliographical reference

Astronomy and Astrophysics, v.428, p.L25-L28 (2004)

Advertised on:
12
2004
Journal
Astronomy and Astrophysics
Number of authors
3
IAC number of authors
0
Citations
41
Refereed citations
37
Description
We present the discovery of a new extreme high proper motion object (˜3.5 arcsec/year) which we classify as an ultracool subdwarf with [M/H] ˜ -0.5. 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 (U,V,W)=(-244,-256,-100)±(32,77,6) km s-1. Based on archival data from the SuperCOSMOS Sky Surveys, 2MASS, and DENIS, and observations with the ESO 3.6-m telescope (ESO 072.C-0630) and VLT (ESO 072.C-0725).
Type
Refereed
Surveys
Astrometry

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