منابع مشابه
The Distribution of Collisionally Induced Blue Stragglers in the Colour-Magnitude Diagram
A primary production mechanism for blue stragglers in globular clusters is thought to be collisionally-induced mergers, perhaps mediated by dynamical encounters involving binary stars. We model the formation and evolution of such blue stragglers, and produce theoretical distributions of them in the colour-magnitude diagram. We use a crude representation of cluster dynamics and detailed binary-s...
متن کاملASTRONOMY AND ASTROPHYSICS Colour - magnitude diagrams of the inner halo globular clusters NGC 5986 and NGC 6712 ?
We present V and I photometry for NGC 5986 and B and V for NGC 6712. NGC 5986 has a blue extended horizontal branch, while NGC 6712 has a composite red and blue horizontal branch, where the latter extends to unusual bluer colours. Both clusters have RR Lyrae. We derive a reddening E(B-V) ≈ 0.29 and a distance from the Sun d ≈ 11.2 kpc for NGC 5986, and E(B-V) ≈ 0.33 and d ≈ 7.9 kpc for NGC 6712...
متن کاملA Color - Magnitude Diagram for a Globular Cluster in the Giant Elliptical Galaxy NGC 5128
The Hubble Space Telescope has been used to obtain WFPC2 (V, I) photometry for a large sample of stars in the outer halo of the giant elliptical NGC 5128, at a distance 4 Mpc beyond the Local Group. The globular cluster N5128-C44, at the center of the Planetary Camera field, is well enough resolved to permit the construction of a color-magnitude diagram (CMD) for it which covers the brightest t...
متن کاملThe Globular Cluster Ngc 5286. I. a New Ccd Bv Color-magnitude Diagram *
We present BV photometry of the Galactic globular cluster NGC 5286, based on 128 V frames and 133 B frames, and covering the entire face of the cluster. Our photometry reaches almost two magnitudes below the turn-off level, and is accordingly suitable for an age analysis. Field stars were removed statistically from the cluster’s color-magnitude diagram (CMD), and a differential reddening correc...
متن کاملA new , cleaner colour - magnitude diagram for the metal - rich globular cluster NGC 6528 and the velocity dispersion in the Galactic Bulge
Using two epochs of observations with HST/WFPC2 we obtain the stellar proper motions for all stars in the field. The proper motions are used to separate the bulge from the cluster stars. The stellar sequences in the resulting colour-magnitude diagram (CMD) are better defined than in any previously published CMD. Using α-enhanced stellar isochrones we find NGC 6528 to have a probable age of 11± ...
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ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society
سال: 1976
ISSN: 0035-8711,1365-2966
DOI: 10.1093/mnras/175.3.525