Bibcode
Lodieu, N.
Bibliographical reference
Handbook of Exoplanets, ISBN 978-3-319-55332-0. Springer International Publishing AG, part of Springer Nature, 2018, id.173
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2018
Citations
0
Refereed citations
0
Description
This chapter reviews our current knowledge of metal-poor ultracool
dwarfs with spectral types later than M7. The current census of M, L,
and T subdwarfs is explored. The main color trends of subdwarfs from the
optical to the mid-infrared are described and their spectral features
presented, which led to a preliminary and tentative spectral
classification subject to important changes in the future when more of
these metal-poor objects are discovered. Their multiplicity and the
determination of their physical parameters (effective temperature,
gravity, metallicity, and mass) are discussed. Finally, some suggestions
and future guidelines are proposed to foster our knowledge on the oldest
and coolest members of our Galaxy.
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