Computer Science
Scientific paper
Jul 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994hst..prop.5325d&link_type=abstract
HST Proposal ID #5325
Computer Science
Hst Proposal Id #5325 Galaxies &Amp, Clusters Stellar Populations
Scientific paper
WFPC2 imaging of a field near the center of the dwarf spheroidal companion to M31, Andromeda-I, will be used to construct a color- magitude diagram that will reveal for the first time the morphology of the horizontal branch in this system. The dwarf spheroidal companions to the Galaxy show a large diversity of horizontal branch types and many show redder horizontal branches than would be expected from their generally low metal abundances. This trend of red horizontal branches despite low abundances, seen in both the galactic dwarf spheroidals and in some outer galactic halo globular clusters, is frequently taken as an indication that these objects formed later than the inner galactic halo. It is therefore of considerable interest to see if the And I, II and III dwarf spheroidal galaxies, which are objects in the outer halo of M31, show this same effect in their horizontal branch morphologies. The TAC has granted time to observe one object and we have decided to concentrate on And I, the most luminous and least affected by bright galactic field stars of the And systems. Subsidiary results that will also follow from this project include a comparison of horizontal branch and giant-branch-tip distance and an estimate of the internal abundance dispersion free from the complications caused by AGB star contamination on the upper giant branch.
No associations
LandOfFree
The Horizontal Branch of the M31 Dwarf Spheroidal Companion Andromeda-I CYCLE4 Medium 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 The Horizontal Branch of the M31 Dwarf Spheroidal Companion Andromeda-I CYCLE4 Medium, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The Horizontal Branch of the M31 Dwarf Spheroidal Companion Andromeda-I CYCLE4 Medium will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1255622