Discovery of a Possible Early-T Thick-disk Subdwarf from the AllWISE2 Motion Survey

February 2018 • 2018AJ....155...87K

Authors • Kellogg, Kendra • Kirkpatrick, J. Davy • Metchev, Stanimir • Gagné, Jonathan • Faherty, Jacqueline K.

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.

Links

• SIMBAD http://simbad.u-strasbg.fr/simbo.pl?bibcode=2018AJ....155...87K
• PDF https://iopscience.iop.org/article/10.3847/1538-3881/aaa3f2/pdf
• PDF https://stacks.iop.org/1538-3881/155/87/pdf
• PREPRINT http://arxiv.org/abs/1712.08658
• DATA https://irsa.ipac.caltech.edu/bibdata/2018/K/2018AJ....155...87K.html
• ELECTR https://doi.org/10.3847%2F1538-3881%2Faaa3f2