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.[2] At a distance of about 1745 pc,[3] the cluster subtends a diameter of about 12 minutes of arc.[4]
There are 137 listed stars, but many are likely non-members, with only 36 having accurate photometric data.[5] It has a total apparent magnitude of 5.3 and integrated spectral type of B1.7.[3] NGC 3766 is relatively young, with an estimated age of log (7.160) or 14.4 million years,[4] and is approaching us at 14.8 km/s.[3] This cluster contains eleven Be stars, two red supergiants and four Ap stars.[5]
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.[6]
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