Mapping the Star Formation History of the Local Group with NHST

Details Mapping the Star Formation History of the Local Group with NHST Mapping the Star Formation History of the Local Group with NHST

May 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003aas...202.4903b&link_type=abstract

American Astronomical Society Meeting 202, #49.03; Bulletin of the American Astronomical Society, Vol. 35, p.768

Astronomy and Astrophysics

Astronomy

Scientific paper

The color-magnitude diagram (CMD) is the most fundamental tool for studying the star formation history of nearby stellar populations. Strong constraints on the ages of stellar populations come from CMDs reaching the main sequence, and with the Hubble Space Telescope (HST), it is possible to produce such a CMD for stars at any distance within the Local Group. Unfortunately, resolving the main sequence in old populations beyond the satellites of the Milky Way requires an enormous investment of HST time, meaning that only a few pencil beams can be explored within the remaining HST mission. In strong contrast, an 8 meter UV-optical space telescope, diffraction limited at 0.5 microns, could map the star formation history of all galaxies in the Local Group: It would take only one hour to resolve the main sequence in any Local Group galaxy, allowing the exploration of hundreds of sight-lines in a reasonable program.

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