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Skrifað af: Snævarr   
Sunnudagur, 30. Desember 2012 15:23

Veturinn 2012 - 2013 tókst höfundi vefsvæðisins að nema þvergöngur fjarreikistjarna. Þær ganga umhverfis stjörnur sem eru auðkenndar:

  1. XO-2 (í Gaupunni)
  2. WASP 33 (í Andrómedu)
  3. HAT-P-10/WASP 11(í Hrútnum)
  4. WASP-12b (í Ökumanni)
  5. HAT-P-3b (í Stórabirni)

Þetta eru fyrstu mælingar sem hafa verið gerðar á fjarreikistjörnum héðan frá Íslandi. Sagt er frá mælingunum á vefsíðu Almanaks Háskóla Íslands. Til þess að sjá greinina skaltu smella hér . Einnig var sagt frá þeim í Morgunblaðinu 9. janúar 2013, og greint frá á vefsíðu þess, smelltu hér. Niðurstöður hafa verið sendar í alþjóðlegan gagnabanka yfir fjarreikistjörnur; Exoplanet Transit Database og þær samþykktar. Framlag stjörnuáhugamanna bætir í sístækkandi þekkingarbrunn um þvergöngur fjarreikistjarna og nýtist til frekari rannsókna á fjarlægum sólkerfum.

Ísland á kortið!
Heimskortið á vefsvæði gagnabankans (ETD) sýnir staði þar sem mælingar fjarreikistjarna eru unnar. Smelltu hér.

Myndin sýnir dæmi um reikistjörnu í þvergöngu fyrir móðurstjörnu sína.
Efst t.v. (enska: This is what we see) sést tindrandi stjarnan eins og hún myndi birtast í sjónauka. Engar vísbendingar fást um hvað á sér stað nema með því að mæla ljósið frá henni nákvæmlega.
Sólstjarnan og þvergangan fyrir miðri mynd, atburðurinn (e: This is happening). Lóðréttar línur birtast þegar þvergangan hefst (e. begin), er hálfnuð (mid) og endar (end).
Neðst er birtustigsferillinn yfir atburðinn. Punktarnir eru mælistök, aflað með CCD ljósmyndavél og sjónauka. Á meðan atburðinum mælist birtan örlitlu minni en fyrir og eftir.

 

Síðast uppfært: Laugardagur, 06. Júlí 2013 13:58
 

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