Ny kølig stjerne i vores baghave
Dette nye billede fra ESOs VISTA teleskop viser en ny-opdaget brun dværgstjerne med kælenavnet VVV BD001, der ligger i centrum af dette zoombare billede. Det er den første nye brune dværg, der er fundet i vores kosmiske nabolag som en del af VVV kortlægningsprojektet. VVV BD001 ligger omkring 55 lysår fra os, ind mod det tætte galaksecentrum.
Brune dværge er stjerner, der aldrig helt har været i stand til at blive store nok til at blive stjerner som vores Sol. De beskrives ofte som "mislykkede stjerner", og er større end planeter som Jupiter med mindre end stjerner.
Denne dværgstjerne er særpræget på to måder; for det første er det den første som er fundet ind mod Mælkevejens tætte centrum, et af de tætteste områder på himlen. For det andet tilhører den en usædvanlig klasse af stjerner, der kendes som "usædvanlige blå brune dværge" - det er stadigvæk ikke klart, hvorfor disse stjerner er mere blå end forventet.
Brune dværge dannes på samme måde som stjerner, men har ikke nok masse til at sætte gang i forbrændingen af brint, så de kan blive normale stjerner. Derfor er de meget koldere og producerer langt mindre lys, hvilket gør dem svære at finde. Astronomer kigger generelt efter disse objekter med nær- og midt-infrarøde kameraer, og særlige teleskoper der er følsomme overfor disse meget kolde objekter, men normalt undgår de af kigge i det meget tætte områder af rummet - som f.eks. den centrale del af vores galakse.
VISTA (the Visible and Infrared Survey Telescope for Astronomy) er verdens største kortlægningsteleskop, og ligger på ESOs Paranal-observatorium i Chile. Det laver seks separate kortlægninger af himlen, og VVV (VISTA Variables in the Via Lactea) kortlægningen er designet til at lave et katalog over en milliard objekter i Mælkevejens centrum. VVV BD001 blev opdaget ved et tilfælde i løbet af dette kortlægningsprojekt.
Forskere har brugt VVV kataloget til at skabe et 3-dimensionelt kort over Mælkevejens centrale bule (eso1339). Og data er også blevet brugt til at skabe en gigantisk 108.200 gange 81.500 pixel stor farvebillede der indeholder næsten 9 milliarder pixels (eso1242), og er et af de største astronomiske billeder der nogensinde er produceret.
Links
Kilde:ESO, and D. Minniti and J. C. Beamín (Pontificia Universidad Católica de Chile).
Om billedet
| Id: | potw1338a |
| Sprog: | da |
| Type: | Observation |
| Udgivelsesdato: | 23. september 2013 10:00 |
| Størrelse: | 1501 x 1501 px |
Om objektet
Baggrundsbilleder
Koordinater
| Position (RA): | 17 26 40.04 |
| Position (Dec): | -27° 38' 2.14" |
| Field of view: | 8.53 x 8.53 arcminutes |
| Orientering: | Nord er 33.6° droite fra lodret |
Farver & filtre
| Bånd | Bølgelængde | Teleskop |
|---|---|---|
| Infrarød J | 1.25 μm | Visible and Infrared Survey Telescope for Astronomy |
| Infrarød H | 1.65 μm | Visible and Infrared Survey Telescope for Astronomy |
| Infrarød Ks | 2.2 μm | Visible and Infrared Survey Telescope for Astronomy |
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