ACS photometry of the globular cluster B514

Details ACS photometry of the globular cluster B514 ACS photometry of the globular cluster B514

2006-09-15

arxiv.org/abs/astro-ph/0609439v1

Astrophys.J.650:L107-L110,2006

Astronomy and Astrophysics

Astrophysics

4 pages, 3 figures. Accepted for publication in ApJ Letters

Scientific paper

10.1086/508884

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 ~200 pc from the center. The Color Magnitude Diagram reveals a steep Red Giant Branch (RGB), and a Horizontal Branch (HB) extending blue ward 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] ~ -1.8, in excellent agreement with spectroscopic estimates. A preliminary estimate of the integrated absolute V magnitude (M_V< -9.1) suggests that B514 is among the brightest globulars of M31.

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