Physics
Scientific paper
Sep 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004sptz.prop..251b&link_type=abstract
Spitzer Proposal ID #251
Physics
Scientific paper
Wide-field near-infrared surveys such as 2MASS, DENIS, and SDSS have uncovered a vast population of ultracool stars and brown dwarfs in the Solar Neighborhood, the majority of which are Solar metallicity members of the disk population. In the past year, a number of ultracool dwarfs with spectral features indicating subsolar metallicity, as well as halo kinematics, have been identified. These ultracool subdwarfs extend into the late-type M and L spectral classes, a regime in which condensate dust plays an increasingly important role in the emergent spectral energy distributions of disk dwarfs. Because dust grains, and indeed many of the dominant absorption features in ultracool dwarfs, are comprised of metals, differences in overall atmospheric metallicity will have a substantial effect on the spectral morphology, cloud formation processes, and evolution of M, L, and T-type stars and brown dwarfs. As part of a comprehensive investigation of metal-poor ultracool dwarfs, I will undertake Spitzer IRAC and IRS observations of several of the coolest currently known subdwarfs and, through comparison to observations of disk dwarfs, search for diagnostics of metallicity. Further comparison to spectral models will enable the determination of the physical properties of these low-mass stars and brown dwarfs while also providing important feedback into our theoretical understanding of cool atmospheres. These observations are part of the PIs Spitzer Fellowship.
No associations
LandOfFree
Old and Cold: Identifying and Characterizing the Coldest Stellar and Substellar Halo Subdwarfs does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Old and Cold: Identifying and Characterizing the Coldest Stellar and Substellar Halo Subdwarfs, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Old and Cold: Identifying and Characterizing the Coldest Stellar and Substellar Halo Subdwarfs will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1823597