Long Period Variables of M81: CYCLE3MEDIUM

Details Long Period Variables of M81: CYCLE3MEDIUM Long Period Variables of M81: CYCLE3MEDIUM

Jul 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993hst..prop.4348h&link_type=abstract

HST Proposal ID #4348

Physics

Hst Proposal Id #4348

Scientific paper

This is part of a very long term project to identify Long-Period Variables (LPVs) in external galaxies. Most LPVs are members of the Asymptotic Giant Branch (AGB), and hence one of the main reasons for studying the LPVs will be to understand the AGB, and how it varies in nearby galaxies. So far the only AGB LPVs to be identified in external galaxies are those in the Magellanic Clouds. Ground based programs are currently underway to identify the AGB LPVs in M31, and using HST to identify the LPVs in a galaxy beyond the local group will tell us how important a part galactic environment plays in the formation of AGB progenitor stars (ie initial main sequence masses of between ~0.8 and 9 solar masses). An important bonus of studying LPVs is that they possess a precise PL relation, which will be a very useful check against the distance derived from Cepheids in the H_0 key project (Program No. 2227).

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