IC 2391

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IC 2391 (also known as the Omicron Velorum Cluster or Caldwell 85) is an open cluster in the constellation Vela consisting of hot, young, blueish stars, some of which are binaries and one of which is a quadruple. Persian astronomer A. a.-R. al-Sufi first described it as "a nebulous star" in c. Template:TrimScript error: No such module "Check for unknown parameters"..[1][2] It was re-found by Abbe Lacaille and cataloged as Lac II 5.

Description

IC 2391 is centred about 490 light-years away from Earth and can be seen with the naked eye. It contains about 30 stars with a total visual magnitude of 2.5, spread out across 50 arcminutes.

Member stars

These are some of the prominent members of IC 2391:[3]

Name Apparent
magnitude (V)		 Spectral type Distance (LY)
HD 74195 (ο Velorum) 3.63 varies[4] style="background:#Template:Color temperature;"|B3/5(V)[5] Script error: No such module "val".[6]
HD 74560 (HY Velorum) sp. binary 4.815[7] style="background:#Template:Color temperature;"| B3IV[5] Script error: No such module "val".[8]
HD 74146 (NZ Velorum) sp. binary 5.19[9] style="background:#Template:Color temperature;"|B5IV[5] Script error: No such module "val".[10]
HD 74071 (HW Velorum) 5.44[7] style="background:#Template:Color temperature;"|B5V[5] Script error: No such module "val".[11]
HD 74196 cepheid variable 5.61[9] style="background:#Template:Color temperature;"|B9/A0[5] Script error: No such module "val".[12]
HD 74535 (KT Velorum) alpha2 CVn variable 5.47[7] style="background:#Template:Color temperature;"|B9III(pSi)[5] Script error: No such module "val".[13]
HD 75466 6.27[7] style="background:#Template:Color temperature;"|B8V[5] Script error: No such module "val".[14]
HD 73952 6.43[7] style="background:#Template:Color temperature;"|B8V[5] Script error: No such module "val".[15]
HD 74438, youngest known quadruple star.[16][17][18] 7.58[7] style="background:#Template:Color temperature;"|A2mA5-A8[5] Script error: No such module "val".[19]

The stars' era of formation is similar to open cluster IC 2602 in neighbouring Carina,[20] and has a lithium depletion boundary age of about 50 million years.[21] The latter group averages about the same distance, placed at about 485 light years away.[22]

File:O Velorum Cluster iTelescope.png
A close of image of IC 2391. Credits: iTelescope.net (T59)

Argus Association

The components formed at about the same time as a nearer group, known as the "Argus Association" which one motion model suggests began in their own nebula cloud. These are in a similar direction, roughly the Vela constellation, within the local galactic arm.[23] The supposed association may chiefly comprise:[23]

Name Constellation Distance Radial velocity
Epsilon Pavonis Pavo 105 −6.7
HD 88955 Vela 100 +7.4
HD 61005 Puppis 119 +22

See also

References

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External links

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Template:Sky Template:Caldwell catalogue Template:Vela (constellation)

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