NGC 3766
NGC 3766
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| NGC 3766 | |
|---|---|
 NGC 3766 image taken with the MPG/ESO 1.2-metre telescope at the La Silla Observatory[1] Credit: ESO | |
| Observation data (J2000 epoch) | |
| Constellation | Centaurus |
| Right ascension | 11h 36.1m |
| Declination | −61° 37′ |
| Distance | 5.5 kly |
Apparent magnitude (V) | 5.3 |
| Apparent dimensions (V) | 12.0′ |
| Physical characteristics | |
| Radius | 9.6 ly |
| Notable features | Easy to view via binoculars or telescope |
| Other designations | NGC 3766, Lacaille III.7, Dunlop 289, Melotte 107, Collinder 248, C1133-613, Caldwell 97 |
Map showing the location of NGC 3766.
NGC 3766 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. 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] Total apparent magnitude of 5.3 and integrated spectral type of B1.7.[2] NGC 3766 is relatively young that is estimated as log (7.160) or 14.4 million years,[3] and 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[edit]
- New General Catalogue
References[edit]
^ "New Kind of Variable Star Discovered". ESO Press Release. Retrieved 14 June 2013..mw-parser-output cite.citation{font-style:inherit}.mw-parser-output q{quotes:"""""""'""'"}.mw-parser-output code.cs1-code{color:inherit;background:inherit;border:inherit;padding:inherit}.mw-parser-output .cs1-lock-free a{background:url("//upload.wikimedia.org/wikipedia/commons/thumb/6/65/Lock-green.svg/9px-Lock-green.svg.png")no-repeat;background-position:right .1em center}.mw-parser-output .cs1-lock-limited a,.mw-parser-output .cs1-lock-registration a{background:url("//upload.wikimedia.org/wikipedia/commons/thumb/d/d6/Lock-gray-alt-2.svg/9px-Lock-gray-alt-2.svg.png")no-repeat;background-position:right .1em center}.mw-parser-output .cs1-lock-subscription a{background:url("//upload.wikimedia.org/wikipedia/commons/thumb/a/aa/Lock-red-alt-2.svg/9px-Lock-red-alt-2.svg.png")no-repeat;background-position:right .1em center}.mw-parser-output .cs1-subscription,.mw-parser-output .cs1-registration{color:#555}.mw-parser-output .cs1-subscription span,.mw-parser-output .cs1-registration span{border-bottom:1px dotted;cursor:help}.mw-parser-output .cs1-hidden-error{display:none;font-size:100%}.mw-parser-output .cs1-visible-error{font-size:100%}.mw-parser-output .cs1-subscription,.mw-parser-output .cs1-registration,.mw-parser-output .cs1-format{font-size:95%}.mw-parser-output .cs1-kern-left,.mw-parser-output .cs1-kern-wl-left{padding-left:0.2em}.mw-parser-output .cs1-kern-right,.mw-parser-output .cs1-kern-wl-right{padding-right:0.2em}
^ abc "NGC 3766". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2013-06-13.
^ ab "WEBDA Astronomical Database". WEBDA Page for NGC 3766. Retrieved 2013-06-13.
^ ab "Webda Astronomical Database". WEBDA Page for NGC 3766a. Retrieved 2013-06-13.
^ Saio, H; Ekström, S; Mowlavi, N; Georgy, C; Saesen, S; Eggenberger, P; Semaan, T; Salmon, S. J. A. J (2017). "Period–luminosity relations of fast-rotating B-type stars in the young open cluster NGC 3766". Monthly Notices of the Royal Astronomical Society. 467 (4): 3864. arXiv:1702.02306. Bibcode:2017MNRAS.467.3864S. doi:10.1093/mnras/stx346.
External links[edit]
- NGC 3766 at SEDS
- Astrophotograph Link
- WEBDA Data on NGC 3766 by Lynga
- NGC 3766 on WikiSky: DSS2, SDSS, GALEX, IRAS, Hydrogen α, X-Ray, Astrophoto, Sky Map, Articles and images
Coordinates: 
11h 36m 06s, −61° 37′ 00″
Caldwell catalogue | |
|---|---|
| List |
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| See also |
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Book:Caldwell catalogue
Category:Caldwell objects 
Portal:Astronomy
Commons:Caldwell objectsCategories:
- Open clusters
- NGC objects
- Centaurus (constellation)
- Caldwell objects
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