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NGC 6934

Globular cluster in the constellation Delphinus

Field	Value
name	NGC 6934
image	[[Image:NGC 6934 Hubble WikiSky.jpg	300px]]
caption	NGC 6934 by Hubble Space Telescope; 3.5 view
epoch	J2000
constellation	Delphinus
ra
dec
dist_ly	16 kpc
size_v
appmag_v	8.83
absmag_v	−7.65
class	VIII
mass_msol
metal_fe	–1.47
names

NGC 6934 (also known as Caldwell 47) is a globular cluster of stars in the northern constellation of Delphinus, about 16 kpc distant from the Sun. It was discovered by the German-born astronomer William Herschel on 24 September 1785. The cluster is following a highly eccentric orbit (with an eccentricity of 0.81) through the Milky Way along an orbital plane that is inclined by 73° to the galactic plane. It may share a common dynamic origin with NGC 5466. As of 2018, it has been poorly studied.

This appears to be a Oosterhoff type I cluster with an intermediate metallicity. It has an Shapley–Sawyer Concentration Class of VIII, with a core radius of and a half-light radius of . The estimated mass is 295,000 times the mass of the Sun. The cluster displays photometric anomalies, with a split subgiant branch on the HR diagram. Searches for variable stars have discovered 85 in the cluster field, of which 79 are of the RR Lyrae class and one is a SX Phe variable. There is some evidence for a tidal tail.

References

| access-date=2010-10-09 }}

| display-authors=1 | journal=The Astronomical Journal

| display-authors=1 | last1=Kaluzny | first1=J.

| display-authors=1 | last1=Wilhelm | first1=R.

| display-authors=1 | journal=The Astrophysical Journal

| display-authors=1 | journal=Monthly Notices of the Royal Astronomical Society

| display-authors=1 | journal=The Astronomical Journal

| display-authors=1 | last1=Hessels | first1=J. W. T.

| display-authors=1 | journal=The Astrophysical Journal

Info: Wikipedia Source

This article was imported from Wikipedia and is available under the Creative Commons Attribution-ShareAlike 4.0 License. Content has been adapted to SurfDoc format. Original contributors can be found on the article history page.

globular-clusters delphinus ngc-objects caldwell-objects astronomical-objects-discovered-in-1785

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