ACS photometry of the remote M31 globular cluster B514

被引：24

作者：

Galleti, S. ^{[1
]}

Federici, L. ^{[1
]}

Bellazzini, M. ^{[1
]}

Buzzoni, A. ^{[1
]}

Pecci, F. Fusi ^{[1
]}

机构：

[1] Osservatorio Astron Bologna, INAF, I-40127 Bologna, Italy

来源：

ASTROPHYSICAL JOURNAL | 2006年 / 650卷 / 02期

关键词：

galaxies : individual (M31); globular clusters : individual (B514); stars : abundances; stars : Population II;

D O I：

10.1086/508884

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present deep F606W, F814W ACS photometry of the recently discovered globular cluster B514, the outermost known globular in the M31 galaxy. The cluster appears quite extended, and member stars are unequivocally identified out to similar to 200 pc from the center. The color-magnitude diagram reveals a steep red giant branch (RGB), and a horizontal branch extending blueward of the instability strip, indicating that B514 is a classical old metal-poor globular cluster. The RGB locus and the position of the RGB bump are both consistent with a metallicity [Fe/H] similar to -1.8, in excellent agreement with spectroscopic estimates. A preliminary estimate of the integrated absolute V magnitude (M-V less than or similar to -9.1 ) suggests that B514 is among the brightest globulars of M31.

引用

页码：L107 / L110

页数：4

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