Lifting the dust veil from the Globular Cluster Palomar2

Abstract

This work employs high-quality {\em Hubble Space Telescope} ({\em HST}) Advanced Camera for Surveys (ACS) F606W and F814W photometry to correct for the differential reddening affecting the colour-magnitude diagram (CMD) of the poorly-studied globular cluster (GC) Palomar\,2. Differential reddening is taken into account by assuming that morphological differences among CMDs extracted across the field of view of Palomar\,2 correspond essentially to shifts (quantified in terms of $\delta E(B-V)$) along the reddening vector due to a non-uniform dust distribution. The average reddening difference over all partial CMDs is $\overline{\delta E(B-V)}=0.24\pm 0.08$, with the highest reaching $\delta E(B-V)=0.52$. The corrected CMD displays well-defined and relatively narrow evolutionary sequences, especially for the evolved stars, i.e. the red-giant, horizontal and asymptotic giant branches (RGB, HB and AGB, respectively). The average width of the upper main sequence and RGB profiles of the corrected CMD corresponds to 56\% of the original one. Parameters measured on this CMD show that Palomar\,2 is $\approx 13.25$\,Gyr old, has the mass $M\sim 1.4\times 10^5{m}_{\odot }$ stored in stars, is affected by the foreground $E(B-V)\approx 0.93$, is located at $d_{\odot }\approx 26$\,Kpc from the Sun, and is characterized by the global metallicity $Z/Zo\approx 0.03$, which corresponds to the range $-1.9\le [Fe/H]\le -1.6$ (for $0.0\le [\alpha /Fe]\le +0.4$), quite consistent with other outer halo GCs. Additional parameters are the absolute magnitude $M_V\approx -7.8$, and the core and half-light radii $r_C\approx 2.6$\,pc and $R_{HL}\approx 4.7$\,pc, respectively.

Accepted for publication by MNRAS

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Cited by in corpus (3)

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• S-PLUS: Exploring wide field properties of multiple populations in galactic globular clusters at different metallicities