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{{Short description|Hypervelocity star in the constellation Dorado}}
{{Starbox begin |
name=HE 0437-5439 }}
{{Starbox image
| image = [[Image:
| caption =
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| ra={{RA|04|38|12.772}}<ref name="aa"/>
| dec={{DEC|-54|33|11.86}}
| appmag_v=16.
}}
{{Starbox character
| class=BV or sdB+F
}}
{{Starbox astrometry
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{{Starbox detail
| mass=8
| age_myr=25 }}
{{Starbox catalog
| names=[[Guide Star Catalog II|GSC2]] S01132011256, [[Hamburg/ESO Survey|HE]] 0437-5439, [BGK2006] HV 3, HVS3. }}
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{{Starbox end}}
'''HE 0437-5439''' is a massive, unbound [[hypervelocity star]] (HVS), also called '''HVS3'''.<ref name=Brown/> It is a [[main sequence]] [[Stellar classification|B-type]] [[star]] located in the [[Dorado constellation]]. It was discovered in
In 2010 a study was published in which its [[proper motion]] was estimated using images from the [[Hubble Space Telescope]] from 2006 and 2009. This ruled out the possibility that the star came from the Large Magellanic Cloud, but was consistent with the hypothesis that it was ejected from the center of the [[Milky Way]]. Given its velocity, this would have occurred 100 million years ago. However, the star seems to be at most 20 million years old, which implies that it is a [[blue straggler]], a star born from the merger of a [[binary star system]], which was earlier ejected from the center of the Milky Way. In order for this to happen, there must have originally been a three-star system, or else there were two black holes and just the two stars.<ref name=Brown/>
== Mechanism of ejection from the Milky Way ==
Studies say that a triple-star system was traveling through the center of the [[Milky Way]] when it
The
In 2008, a team of astronomers found a match between the star's chemical composition and the characteristics of stars in the [[Large Magellanic Cloud]]. Support that the star originated in the LMC
{{multiple image
| align = center
| image1 = HE 0437-5439 mechanism.jpg
| width1 = {{#expr: (300 * (2400 / 1800)) round 0}}
| alt1 =
| caption1 = Illustration of the proposed mechanism of ejection.
| image2 = HE_0437-5439_location.jpg
| width2 = {{#expr: (300 * (2346 / 3000)) round 0}}
| alt2 =
| caption2 = Exact position of the star.
| footer =
}}
== See also ==
*[[Intergalactic
*[[Stellar kinematics]]
*[[Blue straggler]]
== References ==
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<ref name = "ESO051109">{{cite press release|title = Star on the Run - Speeding Star Observed with VLT Hints at Massive Black Hole|publisher = [[European Southern Observatory]]|date = November 9, 2005|url = http://www.ESO.Org/public/news/eso0536/|accessdate = January 28, 2008}}</ref>
<ref name="Sciencedaily">{{cite news|title = Hyperfast Star Proven To Be Alien|work = Space & Time|publisher = [[Science Daily]]|date = January 28, 2008|url =
<ref name=Brown>{{Cite journal
}}
==
*[http://www.nasa.gov/mission_pages/hubble/science/expelled-star.html HE 0437-5439 on NASA]
*[http://www.lecturemaker.com/2010/09/hot-star-leaves-dance/ Two short video clips on the HE 0437-5439 hypervelocity star] LectureMaker film crew produces an introduction and an interview with Dr. Warren R. Brown
{{Stars of Dorado}}
[[Category:B-type main sequence stars]]▼
[[Category:Dorado constellation]]▼
[[Category:Blue stragglers]]
[[Category:Extragalactic stars]]
[[Category:Intergalactic stars]]
[[Category:Hypervelocity stars]]
[[Category:Astronomical objects discovered in 2005|?]]
▲[[es:HE 0437-5439]]
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