Color-Magnitude Diagrams of Globular Clusters in M31: CYCLE4 Medium

Details Color-Magnitude Diagrams of Globular Clusters in M31: CYCLE4 Medium Color-Magnitude Diagrams of Globular Clusters in M31: CYCLE4 Medium

Jul 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994hst..prop.5420f&link_type=abstract

HST Proposal ID #5420

Astronomy and Astrophysics

Astronomy

Hst Proposal Id #5420 Galaxies &Amp, Clusters Distance Scale

Scientific paper

The solution of the distance-scale problem is crucial in Astronomy. The main goals of this program are: a) to improve the accuracy of globular cluster distance (and age) determinations by deriving the dependence of Mv(HB) on metallicity and HB morphology, taking advantage of the M31 globular clusters being in practice all at the same distance; b) to study the HB morphologies as a function of various parameters (e.g. metallicity, galactocentric distance, concentration, etc.) for the essential information they may provide on the formation and early evolutionary phases of galaxies. Structural parameters (e.g. core radius, ellipticity, surface brightness profile) can also be derived. With the allocated observing time we can only obtain Colour-Magnitude Diagrams of two globular clusters in M31 using the FOC/96 and the filters F430W (B) and F480LP (V). Besides, two more clusters will be observed in parallel mode (WFC). With the proposed exposure times it will be possible to measure HB stars with an accuracy of approximately 0.1 mag. The number of clusters will not be sufficient to draw any firm conclusion, but this represents the first important step for an accurate feasibility study and for additional future observations.

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