Two or more halos? Two or more timescales?

Details Two or more halos? Two or more timescales? Two or more halos? Two or more timescales?

Aug 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001noao.prop..274c&link_type=abstract

NOAO Proposal ID #2001B-0274

Computer Science

Scientific paper

The Galaxy's halo may have two rather different origins: the lower halo may be related to the formation of the Galaxy's disk while the more distant, ``higher" halo may have formed independently of the Galaxy and was later accreted by it, perhaps in many separate events. Evidence for this includes some recently discovered tidal streams, and differences in chemical abundances, RR Lyrae pulsational periods, and binary frequency among stars located at different distances from the plane or whose motions carry them to different distances. We propose to explore the possible halo dichotomy chemically and with a reasonably precise surrogate chronometer: the relative abundances of r-process and s- process elements in local metal-poor dwarfs whose motions are well known. These stars' motions classify them as ``low halo" or ``high halo", while the ratio of the more rapidly-formed r-process elements compared to the slightly more slowly formed s-process elements provides us with a means of estimating the relative star formation timescales for the two populations.

Affiliated with

Also associated with

No associations

Rating

Two or more halos? Two or more timescales? 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 Two or more halos? Two or more timescales?, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Two or more halos? Two or more timescales? will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-818914