NGC 6584

NGC 6584
NGC 6584 as observed by the Hubble Space Telescope.
Observation data (J2000 epoch)
ConstellationTelescopium
Right ascension18h 18m 37.60s[1]
Declination–52° 12′ 56.8″[1]
Distance45000[2]
Apparent dimensions (V)7.9'
Physical characteristics
Metallicity = −1.53±0.08[3] dex
Estimated age11.6±1.7 Gyr[3]
See also: Globular cluster, List of globular clusters

NGC 6584 is a globular cluster in the constellation Telescopium that lies near Theta Arae and is 45000 light-years distant.[2] It is an Oosterhoff type I cluster, and contains at least 69 variable stars, most of which are RR Lyrae variables: 46 stars were identified as RRab variables; 15 as RRc variables, 1 RRe variable, 4 eclipsing binaries and 3 long period variables.[4] NGC 6584 is about 4 kpc from the Galactic Center and about 2.7 kpc from the Galactic plane.[5]

As is typical for metal-poor globular clusters, NGC 6584 has an enhanced concentration of alpha elements relative to iron.[3]

  1. ^ a b Cite error: The named reference aj140_6_1830 was invoked but never defined (see the help page).
  2. ^ a b Cite error: The named reference SAAO was invoked but never defined (see the help page).
  3. ^ a b c High-resolution Spectroscopic Abundances of Red Giant Branch Stars in NGC 6584 and NGC 7099
  4. ^ Cite error: The named reference Toddy2012 was invoked but never defined (see the help page).
  5. ^ "Physical Parameters of Galactic Globular Clusters" by S. Djorgovski