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]
| NGC 6584 | |
|---|---|
 | |
| Observation data (J2000 epoch) | |
| Class | VIII |
| Constellation | Telescopium |
| Right ascension | 18h 18m 37.60s[1] |
| Declination | –52° 12′ 56.8″[1] |
| Distance | 45000[2] |
| Apparent dimensions (V) | 7.9' |
| Physical characteristics | |
| Metallicity | = −1.53±0.08[3] dex |
| Estimated age | 11.6±1.7 Gyr[3] |
As is typical for metal-poor globular clusters, NGC 6584 has an enhanced concentration of alpha elements relative to iron.[3]
References
edit- ^ a b Goldsbury, Ryan; et al. (December 2010), "The ACS Survey of Galactic Globular Clusters. X. New Determinations of Centers for 65 Clusters", The Astronomical Journal, 140 (6): 1830–1837, arXiv:1008.2755, Bibcode:2010AJ....140.1830G, doi:10.1088/0004-6256/140/6/1830, S2CID 119183070.
- ^ a b Streicher, Magda (August 2009). "A Spyglass Telescope" (PDF). Deepsky Delights. 68: 168. Bibcode:2009MNSSA..68..168S. Retrieved 29 September 2012.[permanent dead link]
- ^ a b c High-resolution Spectroscopic Abundances of Red Giant Branch Stars in NGC 6584 and NGC 7099
- ^ Toddy, Joseph M.; Johnson, Elliott W.; Darragh, Andrew N.; Murphy, Brian W. (2012). "New Variable Stars in the Globular Cluster NGC 6584". Journal of the Southeastern Association for Research in Astronomy. 6: 63–71. arXiv:1205.1034. Bibcode:2012JSARA...6...63T.
- ^ "Physical Parameters of Galactic Globular Clusters" by S. Djorgovski
External links
editMedia related to NGC 6584 at Wikimedia Commons
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