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Full-Text Articles in Physical Sciences and Mathematics
The Acs Survey Of Galactic Globular Clusters: M54 And Young Populations In The Sagittarius Dwarf Spheroidal Galaxy, Michael H. Siegel, Aaron Dotter, Steven R. Majewski, Ata Sarajedini, Brian Chaboyer, David L. Nidever, Jay Anderson, Antonio Martin-French, Alfred Rosenberg, Luigi R. Bedin, Antonio Aparicio, Ivan King, Giampolo Piotto, I. Neill Reid
The Acs Survey Of Galactic Globular Clusters: M54 And Young Populations In The Sagittarius Dwarf Spheroidal Galaxy, Michael H. Siegel, Aaron Dotter, Steven R. Majewski, Ata Sarajedini, Brian Chaboyer, David L. Nidever, Jay Anderson, Antonio Martin-French, Alfred Rosenberg, Luigi R. Bedin, Antonio Aparicio, Ivan King, Giampolo Piotto, I. Neill Reid
Dartmouth Scholarship
As part of the ACS Survey of Galactic Globular Clusters, we present new Hubble Space Telescope photometry of the massive globular cluster M54 (NGC 6715) and the superposed core of the tidally disrupted Sagittarius (Sgr) dSph galaxy. Our deep (F606W ~ 26.5), high-precision photometry yields an unprecedentedly detailed color-magnitude diagram showing the extended blue horizontal branch and multiple main sequences of the M54+Sgr system. The distance and reddening to M54 are revised using both isochrone and main-sequence fitting to (m - M)0 = 17.27 and E(B - V) = 0.15. Preliminary assessment finds the …