Discovery of a Possible Early-T Thick-disk Subdwarf from the AllWISE2 Motion Survey
Abstract
We have discovered a potential T0 ± 1 subdwarf from a search for sources in the AllWISE2 Motion Survey that do not have counterparts in surveys at shorter wavelengths. With a tangential velocity of ∼170 km s-1, this object—WISE J071121.36-573634.2—has kinematics that are consistent with the thick-disk population of the Milky Way. Spectral fits suggest a low-metallicity for this object but also allow for the possibility of unresolved multiplicity. If WISE J0711-5736 is indeed an sdT0 dwarf, it would be only the second early-T subdwarf discovered to date.
This paper includes data gathered with the 6.5 m Magellan Telescopes located at Las Campanas Observatory, Chile.- Publication:
-
The Astronomical Journal
- Pub Date:
- February 2018
- DOI:
- 10.3847/1538-3881/aaa3f2
- arXiv:
- arXiv:1712.08658
- Bibcode:
- 2018AJ....155...87K
- Keywords:
-
- brown dwarfs;
- infrared: stars;
- stars: individual: WISE J071121.36-573634.2;
- stars: late-type;
- stars: peculiar;
- Astrophysics - Solar and Stellar Astrophysics
- E-Print:
- 11 pages, 6 figures, accepted to AJ