IC 4756: Difference between revisions
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{{Infobox open cluster | {{Infobox open cluster | ||
| name = IC 4756 | | name = IC 4756 | ||
| image = [[File:IC 4756. | | image = [[File:Open star clusters IC 4756 and NGC 6633.jpg|280px]] | ||
| caption = Open star clusters IC 4756 (left) and [[NGC 6633]] | |||
| epoch = [[J2000]] | | epoch = [[J2000]] | ||
|ra = {{RA|18|38|31.2}}<ref name="SIMBAD">{{cite simbad | |ra = {{RA|18|38|31.2}}<ref name="SIMBAD">{{cite simbad | ||
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IC 4756 is also known as the Tweedledee Cluster (paired with [[NGC 6633]] as Tweedledum), also as the Secret Garden Cluster.<ref>{{cite book |last=O'Meara|first=Stephen James |date=2007 |title=Deep-Sky Companions: Hidden Treasures|publisher=Cambridge University Press|page=457-458|isbn=978-0521-83704-0}}</ref> | IC 4756 is also known as the Tweedledee Cluster (paired with [[NGC 6633]] as Tweedledum), also as the Secret Garden Cluster.<ref>{{cite book |last=O'Meara|first=Stephen James |date=2007 |title=Deep-Sky Companions: Hidden Treasures|publisher=Cambridge University Press|page=457-458|isbn=978-0521-83704-0}}</ref> | ||
[[Metallicity]] of IC 4756 is similar to the Sun, at | [[Metallicity]] of IC 4756 is similar to the Sun, at −0.02{{±|0.01}} dex.<ref>{{citation|arxiv=1804.01975|year=2018|title=Chemical composition of giant stars in the open cluster IC 4756|doi=10.1051/0004-6361/201832695|last1=Bagdonas|first1=Vilius|last2=Drazdauskas|first2=Arnas|last3=Tautvaišienė|first3=Gražina|author-link3=Gražina Tautvaišienė|last4=Smiljanic|first4=Rodolfo|last5=Chorniy|first5=Yuriy|journal=Astronomy & Astrophysics|volume=615|pages=A165|bibcode=2018A&A...615A.165B|s2cid=118857628 }}</ref> | ||
==Stars== | ==Stars== | ||
Latest revision as of 13:34, 30 June 2025
Template:Short description Script error: No such module "Infobox".Template:Template other IC 4756 is a large bright open cluster in the constellation Serpens. Known as Graff's Cluster, it is bright enough to be seen with the naked eye and considered a fine cluster for binoculars or small telescopes.[1]
IC 4756 is also known as the Tweedledee Cluster (paired with NGC 6633 as Tweedledum), also as the Secret Garden Cluster.[2]
Metallicity of IC 4756 is similar to the Sun, at −0.02±0.01 dex.[3]
Stars
There are some noteworthy stars in the cluster. HD 172365[4] is a likely post-blue straggler in the IC 4756 that contains a large excess of lithium.[5] HD 172189, also in IC 4756, is an Algol variable eclipsing binary[6] with a 5.70 day period. The primary star in the system is also a Delta Scuti variable, undergoing multiple pulsation frequencies, which, combined with the eclipses, causes the system to vary by around a tenth of a magnitude.[7]
References
External links
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