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2012 Epsilon Aurigae
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Skrifað af: Snævarr   
Miðvikudagur, 06. Maí 2009 19:19

Epsilon Aurigae, by Starry Night Pro

 

Í stjörnumerkinu Hjarðmanni (latína: Aurigae) er að finna eina óvenjulegustu myrkvastjörnu sem um getur. Epsilon Aurigae, eða Almaz, er nyrst kiðlinganna oddmyndaðs samstirnis myndað af þremur stjörnum (sjá 1. mynd). Kiðlingarnir (Epsilon, Hoedus I og Hoedus II) eru skammt suðvestan við Kapellu (Kaupamannastjörnuna) sem er sjötta bjartasta stjarna himins. Á myndinni er Lambda (SAO 40233)einnig merkt en í ljósmælingunum var hún notuð sem viðmið.

Myrkvatvístirni eru stjörnur þar sem ljósdeyfing á sér stað tímabundið. Því veldur að önnur stjarnan gengur fyrir hina og við það verður breyting á heildarbirtu kerfisins, séð frá athuganda. Misjafnt er hve lengi myrkvi stendur yfir. Annars staðar á heimasvæðinu er umfjöllun um myrkvatvístirnin XZ AND í stjörnumerkinu Andrómedu og W UMa í StóraBirni (Karlsvagninum). Birtulotur flestra þekktra myrkvatvístirna standa yfir í nokkrar klukkustundir til örfárra daga, í mesta lagi nokkra mánuði. Epsilon er hins vegar óvenjuleg að því leyti að 27,1 ár (9892 dagar) skilja á milli myrkva og þeir standa yfir í um tvö ár.

Nýverið lauk myrkva Epsilon. Höfundur tók þátt í alþjóðlegu samstarfi, árin 2009 - 2011,  í að safna gögnum, þ.e. að mæla birtu hennar á meðan myrkvanum stóð. Feril myrkvans má sjá hér fyrir neðan (2. mynd).  Næsti myrkvi hennar verður 2036 - 38. Til nánari upplýsinga um þessa merkilegu myrkvastjörnu, sjá heimildir neðst, m.a. um rannsóknarverkefnið.

 

epsilon aurigae eclipse

 

Epsilon AUR Tegund: EA/GS
Stöðuhnit 05:01'58  +43° 49' 24"
Birtustig (V)
 2,92 - 3,83
Birtulota 9892 dagar, 27,1 ár
almyrkvi
 446 dagar
lengd myrkva 647 dagar
B-V 0,54

 

Vefsíða tileinkuð Epsilon Aurigae:
http://www.hposoft.com/Astro/PEP/EpsilonAurigae.html

Umfjöllun um Epsilon á APOD:

http://apod.nasa.gov/apod/ap100108.html

 

Síðast uppfært: Miðvikudagur, 25. Janúar 2012 16:34
 

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