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Post Info TOPIC: NGC 5694


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Posts: 131433
Date:
Caldwell 66
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NGC 5694 (also Caldwell 66, ESO 512-SC10 and GCL 29) is a magnitude +10.2 globular cluster located 105000 light-years away in the constellation Hydra.

The cluster was discovered by German-British astronomer William Herschel using a 47.5 cm (18.7 inch) f/13 speculum reflector at Datchet, Berkshire, on the 22nd May 1784. 

Right Ascension 14h 39m 36.5s, Declination -26° 32' 18.0"

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Posts: 131433
Date:
Tombaugh's Globular Cluster
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NGC 5694 is a magnitude +10.2 globular cluster, 105,000 light-years from Earth. Also called "Tombaugh's Globular Cluster", it is a Shapley class VII cluster; the classification indicates that it has intermediate concentration at its nucleus. Though it was discovered as a non-stellar object in 1784 by William Herschel, its status as a globular cluster was not ascertained until 1932, when Clyde Tombaugh looked at photographic plates taken of the region near Pi Hydrae on 12 May 1931.
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Posts: 131433
Date:
NGC 5694
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Title: NGC5694: another extra-galactic globular cluster
Authors: A. Mucciarelli, M. Bellazzini, M. Catelan, P. Amigo, M. Correnti, C. Cortés, E. Dalessandro, V. D'Orazi

We discuss the chemical composition of six giant stars of the outer Halo globular cluster NGC5694, through the analysis of UVES@FLAMES high-resolution spectra. The cluster has an average iron content [Fe/H]=--1.83±0.01, solar-scaled [alpha/Fe] ratios and a very low Ba abundance ([Ba/Fe]=--0.71±0.06). These anomalous abundance patterns are different from those observed in other Halo globular clusters but similar to those of the metal-poor stars in typical dwarf spheroidal galaxies. These findings suggest an extra-galactic origin for NGC5694, likely from a dwarf spheroidal galaxy.

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