Ultracool Subdwarfs: Subsolar Metallicity Objects Down to Substellar Masses

Details Ultracool Subdwarfs: Subsolar Metallicity Objects Down to Substellar Masses Ultracool Subdwarfs: Subsolar Metallicity Objects Down to Substellar Masses

2007-01-29

arxiv.org/abs/astro-ph/0701793v1

Astronomy and Astrophysics

Astrophysics

5 pages, 4 figures, contribution to proceedings for the 14th Cambridge Workshop on Cool Stars, Stellar Systems and the Sun, 6-

Scientific paper

In the past few years, astronomers have uncovered several very low-temperature, metal-poor stars with halo or thick disk kinematics and peculiar spectral and photometric properties, so-called ultracool subdwarfs. These include the first examples of L subdwarfs - metal-poor analogs of the L dwarf spectral class - and slightly metal-deficient T dwarfs. Ultracool subdwarfs provide useful empirical tests of low temperature atmosphere and evolutionary models, and are probes of the halo mass function down to and below the (metal-dependent) hydrogen burning limit. Here I summarize the optical and near-infrared spectroscopic properties of these objects, review recent research results, and point out scientific issues of interest in this developing subject.

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