NGC 3766
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NGC 3766 (also known as Caldwell 97) is an open star cluster in the southern constellation Centaurus. It is located in the vast star-forming region known as the Carina molecular cloud, and was discovered by Nicolas Louis de Lacaille during his astrometric survey in 1751–1752.[1] At a distance of about 1745 pc,[2] the cluster subtends a diameter of about 12 minutes of arc.[3]
There are 137 listed stars, but many are likely non-members, with only 36 having accurate photometric data.[4] It has a total apparent magnitude of 5.3 and integrated spectral type of B1.7.[2] NGC 3766 is relatively young, with an estimated age of log (7.160) or 14.4 million years,[3] and is approaching us at 14.8 km/s.[2] This cluster contains eleven Be stars, two red supergiants and four Ap stars.[4]
36 examples of an unusual type of variable star were discovered in the cluster. These fast-rotating pulsating B-type stars vary by only a few hundredths of a magnitude with periods less than half a day. They are main sequence stars, hotter than δ Scuti variables and cooler than slowly pulsating B stars.[5]
See also
References
External links
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- NGC 3766 at SEDS
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- WEBDA Data on NGC 3766 by Lynga
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