Purple dwarfs : New L subdwarfs from UKIDSS and SDSS
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Author
Zhang, Z. H.
Pinfield, D.J.
Burningham, B.
Jones, H.R.A.
Day-Jones, A. C.
Marocco, F.
Gomes, J.
Galvez-Ortiz, M. C.
Attention
2299/13945
Abstract
The first L subdwarf was a discovered only ten years ago. Less than ten L subdwarfs been published in the literature to date. Metal-poor ultracool atmospheres has not been well understood. Halo mass function cross substellar limit has not been measured. We used UKIDSS and SDSS to search for L subdwarfs. We have confirmed some new L subdwarfs and are following up more candidates with ground based large telescopes. We discussed spectral features of L subdwarfs and halo brown dwarfs.