NGC 6535
{{Short description|Globular cluster in the constellation Serpens}}
{{Use dmy dates|date=March 2024}}
{{Infobox globular cluster
| name = NGC 6535
| image = Potw1452a.tif
| caption =
| epoch = J2000
| class = XI{{cn|date=September 2024}}
| constellation = Serpens
| dist_ly = {{cvt|6.8|kpc|kly|order=flip|lk=on}}
| size_v =
| mass_msol = {{val|2.21|0.78|e=4}}
| radius_ly =
| v_hb =
| notes =
| names = {{odlist | NGC=6535 }}, C 1801-003, Glc 83
}}
NGC 6535 is a globular cluster of stars located at a distance of 22,200 light years from Earth in the equatorial constellation of Serpens, and is listed in the New General Catalogue. Its discovery is usually attributed to astronomer John Russell Hind in 1852. However, Wolfgang Steinicke has uncovered evidence that William Herschel's first discovery was actually NGC 6535, which he observed on 24 August 1780.
This is a halo globular cluster located close to the galactic bulge at a distance of {{cvt|3.9|kpc|kly|order=flip}} from the Galactic Center. It has an estimated age of 12.75 billion years. For a object of its type, NGC 6535 has a relatively low mass of {{val|2.2|e=4}} times the mass of the Sun. The core radius is {{cvt|0.71|pc|ly|order=flip}} and the tidal radius is {{cvt|15.3|pc|ly|order=flip}}. It has an unusually high mass-to-light ratio of 11.
The cluster is suspected to harbour an intermediate-mass black hole in its center. Unusually for a low-mass globular cluster, it has multiple generations of stars. Rather small and sparse for a globular cluster, this cluster contains no known RR Lyrae variables, which is unusual for a globular cluster. Nine blue stragglers have been discovered.
References
{{Reflist|refs=
| title=NGC 6535
| access-date=2017-05-16}}
| title=The ACS Survey of Galactic Globular Clusters. X. New Determinations of Centers for 65 Clusters
| last1=Goldsbury | first1=Ryan | last2=Richer | first2=Harvey B.
| last3=Anderson | first3=Jay | last4=Dotter | first4=Aaron
| last5=Sarajedini | first5=Ata | last6=Woodley | first6=Kristin
| display-authors=1 | journal=The Astronomical Journal
| volume=140 | issue=6 | pages=1830–1837 | date=December 2010
| doi=10.1088/0004-6256/140/6/1830 | arxiv=1008.2755
| bibcode=2010AJ....140.1830G | s2cid=119183070 }}
| title=Ultraviolet Properties of Galactic Globular Clusters with Galex. II. Integrated Colors
| display-authors=1 | last1=Dalessandro | first1=Emanuele
| last2=Schiavon | first2=Ricardo P. | last3=Rood | first3=Robert T.
| last4=Ferraro | first4=Francesco R. | last5=Sohn | first5=Sangmo T.
| last6=Lanzoni | first6=Barbara | last7=O'Connell | first7=Robert W.
| journal=The Astronomical Journal
| volume=144 | issue=5 | id=126 | pages=13 | date=November 2012
| doi=10.1088/0004-6256/144/5/126 | s2cid=56419886
| bibcode=2012AJ....144..126D | arxiv=1208.5698 }}
| title=Hubble Sees an Ancient Globular Cluster
| last=Hille | first=Karl
| date=2015-02-24 | website=NASA
| url=http://www.nasa.gov/content/goddard/hubble-sees-an-ancient-globular-cluster
| access-date=2021-03-10 }}
| title=New General Catalog Objects: NGC 6500 - 6549
| first=Courtney | last=Seligman
| website=cseligman.com
| url=https://cseligman.com/text/atlas/ngc65.htm#6535
| access-date=2021-03-10 }}
| title=Photos | website=www.klima-luft.de
| url=http://www.klima-luft.de/steinicke/ngcic/persons/herschel_w.htm
| access-date=2021-03-10 }}
| title=MOCCA-SURVEY Database I: Is NGC 6535 a dark star cluster harbouring an IMBH?
| last1=Askar | first1=Abbas | last2=Bianchini | first2=Paolo
| last3=De Vita | first3=Ruggero | last4=Giersz | first4=Mirek
| last5=Hypki | first5=Arkadiusz | last6=Kamann | first6=Sebastian
| journal=Monthly Notices of the Royal Astronomical Society
| volume=464 | issue=3 | pages=3090–3100 | year=2016
| doi=10.1093/mnras/stw2573 | doi-access=free
| arxiv=1607.08275 | display-authors=1 }}
| title=NGC 6535: The lowest mass Milky Way globular cluster with a Na-O anti-correlation?
| display-authors=1 | last1=Bragaglia | first1=A.
| last2=Carretta | first2=E. | last3=d'Orazi | first3=V.
| last4=Sollima | first4=A. | last5=Donati | first5=P.
| last6=Gratton | first6=R. G. | last7=Lucatello | first7=S.
| journal=Astronomy & Astrophysics
| volume=607 | pages=A44 | year=2017
| doi=10.1051/0004-6361/201731526
| arxiv=1708.07705 | s2cid=119235401 }}
| title=Horizontal-Branch Morphology and Dense Environments: Hubble Space Telescope Observations of Globular Clusters NGC 2298, 5897, 6535, and 6626
| display-authors=1 | last1=Testa | first1=Vincenzo
| last2=Corsi | first2=Carlo E. | last3=Andreuzzi | first3=Gloria
| last4=Iannicola | first4=Giacinto | last5=Marconi | first5=Gianni
| last6=Piersimoni | first6=Anna Marina | last7=Buonanno | first7=Roberto
| journal=The Astronomical Journal
| volume=121 | issue=2 | pages=916–934 | year=2001
| bibcode=2001AJ....121..916T | s2cid=118936939
| doi=10.1086/318752 | doi-access=free}}
| title=CCD Photometry of the Galactic globular cluster NGC 6535 in the B and V Passbands
| last=Sarajedini | first=Ata
| journal=Publications of the Astronomical Society of the Pacific
| volume=106 | pages=404 | year=1994
| bibcode=1994PASP..106..404S
| doi=10.1086/133392
| doi-access=}}
}}
External links
- {{commonscat-inline}}
- {{Cite web| url = http://spider.seds.org/spider/MWGC/n6535.html
| title = SEDS | access-date = 2017-05-15}}
{{Ngc70}}
{{Serpens}}
{{DEFAULTSORT:NGC 6535}}