Details

Autor(en) / Beteiligte

• Hamren, Katherine M
• Smith, Graeme H
• Guhathakurta, Puragra
• Dolphin, Andrew E
• Weisz, Daniel R
• Rajan, Abhijith
• GRILLMAIR, CARL J

Titel

HST /WFC3 OBSERVATIONS OF LOW-MASS GLOBULAR CLUSTERS AM 4 AND PALOMAR 13: PHYSICAL PROPERTIES AND IMPLICATIONS FOR MASS LOSS

Ist Teil von

• The Astronomical journal, 2013-11, Vol.146 (5), p.1-9

Ort / Verlag

United States

Erscheinungsjahr

2013

Quelle

EZB Electronic Journals Library

Beschreibungen/Notizen

• We investigate the loss of low-mass stars in two of the faintest globular clusters known, AM 4 and Palomar 13 (Pal 13), using HST/WFC3 F606W and F814W photometry. To determine the physical properties of each cluster-age, mass, metallicity, extinction, and present day mass function (MF)-we use the maximum likelihood color-magnitude diagram (CMD) fitting program MATCH and the Dartmouth, Padova, and BaSTI stellar evolution models. We find that the systematic uncertainties due to choice in assumed stellar model greatly exceed the random uncertainties, highlighting the importance of using multiple stellar models when analyzing stellar populations. Comparing our derived slopes with literature measurements of cluster integrated magnitude (M sub(V)) and MF slope indicates that AM 4 is an outlier.