A heavy-metal home

This 10.5-billion-year-old globular cluster, NGC 6496, is home to heavy-metal stars of a celestial kind! The stars comprising this spectacular spherical cluster are enriched with much higher proportions of metals — elements heavier than hydrogen and helium, are in astronomy curiously known as metals — than stars found in similar clusters.

A handful of these high-metallicity stars are also variable stars, meaning that their brightness fluctuates over time. NGC 6496 hosts a selection of long-period variables — giant pulsating stars whose brightness can take up to, and even over, a thousand days to change — and short-period eclipsing binaries, which dim when eclipsed by a stellar companion.

The nature of the variability of these stars can reveal important information about their mass, radius, luminosity, temperature, composition, and evolution, providing astronomers with measurements that would be difficult or even impossible to obtain through other methods.

NGC 6496 was discovered in 1826 by Scottish astronomer James Dunlop. The cluster resides at about 35 000 light-years away in the southern constellation of Scorpius (The Scorpion).

Credit:

ESA/Hubble & NASA

Acknowledgement: Judy Schmidt (Geckzilla)

About the Image

Id:potw1622a
Type:Observation
Release date:30 May 2016, 06:00
Size:4259 x 4035 px

About the Object

Name:NGC 6496
Type:Milky Way : Star : Grouping : Cluster : Globular
Distance:35000 light years
Constellation:Scorpius
Category:Star Clusters

Image Formats

Large JPEG
10.0 MB
Screensize JPEG
711.4 KB

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734.2 KB
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1.1 MB
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1.6 MB
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1.8 MB
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2.5 MB

Coordinates

Position (RA):17 59 3.21
Position (Dec):-44° 16' 7.58"
Field of view:2.81 x 2.66 arcminutes
Orientation:North is 4.1° right of vertical

Colours & filters

BandWavelengthTelescope
Optical
V
606 nm Hubble Space Telescope
ACS
Optical
B
438 nm Hubble Space Telescope
WFC3
Ultraviolet
U
336 nm Hubble Space Telescope
WFC3
Infrared
I
814 nm Hubble Space Telescope
ACS

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