Bestand:Young Stellar System Caught in the Act of Forming Close Multiples.jpg
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Beschrijving
BeschrijvingYoung Stellar System Caught in the Act of Forming Close Multiples.jpg |
English: For the first time, astronomers have seen a dusty disc of material around a young star fragmenting into a multiple star system. This image comprises new observations from the Atacama Large Millimeter/submillimeter Array (ALMA), Chile, and reveals the process in action!
Stars form in cosmic clouds of gas and dust, when the thin material in the clouds collapses gravitationally into denser cores that in turn draw additional material inward. The infalling material forms a rotating disc around the young star, and is slowly consumed. Eventually, the young star gathers enough mass to create the necessary temperatures and pressures at its centre to trigger nuclear fusion. Stars that have no companion — such as the Sun — are not as common as we once thought. In fact, almost half of the stars in our galaxy have at least one companion, and some are more sociable still! Previous studies have indicated that the stars in multiple systems tend to be either relatively close to each other, within about 500 times the Earth-Sun distance (known as an Astronomical Unit or AU), or significantly further apart, at over 1000 AU. Given these wildly different distances, scientists concluded that there were two main mechanisms producing multiple star systems — either the original cloud collapsed unstably and fragmented, each subsequent fragment crumpling to form a new star, or the rotating disc around an existing star fragmented, with the same result. Systems with larger separations likely formed via the former process (as recent observational studies have suggested), and closer-knit stellar families via the latter (although there was limited evidence of this process). New data from ALMA have now offered observational evidence of this conclusion. This image shows the second process in action, as seen in the young triple star system L1448 IRS3B. The trio are still deeply embedded within their parent cloud in the constellation of Perseus, some 750 light-years from Earth, and are hungrily feeding from material in the surrounding disc. ALMA has revealed this disc to have a spiral structure, a feature that indicates gravitational instability. |
Datum | |
Bron | https://www.eso.org/public/images/potw1644a/ |
Auteur | ALMA (ESO/NAOJ/NRAO)/J.J. Tobin (University of Oklahoma/Leiden University) |
Licentie
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This image was produced by the ALMA Observatory.
Unless specifically noted, the images and videos distributed from the public ALMA websites (www.almaobservatory.org, www.alma.cl, and kids.alma.cl) along with the texts of press releases, announcements, pictures of the week and captions, are licensed under a Creative Commons Attribution 4.0 International License, and may on a non-exclusive basis be reproduced without fee provided the credit is clear and visible. Details on how to interpret this are given below for those who need further explanation. See the ALMA copyright notice for complete information. Conditions:
Notes:
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![]() ![]() Dit bestand is gelicenseerd onder de Creative Commons Naamsvermelding 4.0 Internationaal licentie. Naamsvermelding: ALMA
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31 okt 2016
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huidige versie | 15 nov 2016 15:40 | ![]() | 1.280 × 1.284 (64 kB) | Jmencisom | User created page with UploadWizard |
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Metadata
Dit bestand bevat metadata met EXIF-informatie, die door een fotocamera, scanner of fotobewerkingsprogramma toegevoegd kan zijn.
Gebruikte software | Adobe Photoshop CC 2015.5 (Windows) |
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Tijdstip gegevensaanmaak | 31 okt 2016 06:00 |
Tijdstip laatste bestandswijziging | 25 okt 2016 17:41 |
Tijdstip digitalisering | 30 sep 2016 10:59 |
Datum waarop de metadata het laatst zijn bewerkt | 25 okt 2016 19:41 |
Uniek ID van het originele document | xmp.did:15853da2-7391-456d-9e5f-5980876e7f32 |
Credit/Leverancier | ALMA (ESO/NAOJ/NRAO)/J.J. Tobin (University of Oklahoma/Leiden University) |
Bron | European Southern Observatory |
Korte naam |
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Omschrijving afbeelding |
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Trefwoorden | L1448 IRS3B |
Contactgegevens |
Karl-Schwarzschild-Strasse 2 Garching bei München, , D-85748 Germany |
Gebruiksvoorwaarden |
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IIM-versie | 4 |