NGC_6584 Knowpia

NGC 6584
NGC 6584
Observation data (J2000 epoch)
Constellation	Telescopium
Right ascension	18h 18m 37.60s
Declination	–52° 12′ 56.8″
Distance	45000
Apparent dimensions (V)	7.9'
Physical characteristics
Metallicity	= −1.53±0.08 dex
Estimated age	11.6±1.7 Gyr
	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]

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 edit

Media related to NGC 6584 at Wikimedia Commons

[aj140_6_1830-1] 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.

[SAAO-2] Streicher, Magda (August 2009). "A Spyglass Telescope" (PDF). Deepsky Delights. 68: 168. Bibcode:2009MNSSA..68..168S. Retrieved 29 September 2012.^{[permanent dead link]}

[Omalley2018-3] High-resolution Spectroscopic Abundances of Red Giant Branch Stars in NGC 6584 and NGC 7099

[Toddy2012-4] 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.

[5] "Physical Parameters of Galactic Globular Clusters" by S. Djorgovski

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Summary

References edit

External links edit