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26 April 2024 |
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Unveiling Palomar 2: The Most Obscure Globular Cluster in the Outer Halo | | W.E.Harris
; P.R.Durrell
; G.R.Petitpas
; T.M.Webb
; S.C.Woodworth
; | | Date: |
3 Jul 1997 | | Subject: | astro-ph | | Abstract: | We present the first color-magnitude study for Palomar 2, a distant and heavily obscured globular cluster near the Galactic anticenter. Our (V,V-I) color-magnitude diagram (CMD), obtained with the UH8K camera at the CFHT, reaches V(lim) = 24 and clearly shows the principal sequences of the cluster, though with substantial overall foreground absorption and differential reddening. The CMD morphology shows a well populated red horizontal branch with a sparser extension to the blue, similar to clusters such as NGC 1261, 1851, or 6229 with metallicities near [Fe/H] = -1.3$. From an average of several indicators, we estimate the foreground reddening at E(B-V) = 1.24 +- 0.07 and obtain a true distance modulus (m-M)_0 = 17.1 +- 0.3$, placing it about 34 kpc from the Galactic center. We use starcounts of the bright stars to measure the core radius, half-mass radius, and central concentration of the cluster. Its integrated luminosity is M_V = -7.9, making it clearly brighter and more massive than most other clusters in the outer halo. | | Source: | arXiv, astro-ph/9707049 | | Services: | Forum | Review | PDF | Favorites | |
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