Erste Schritte eines Babysterns
Das leistungsstarke Atacama Large Millimeter/submillimeter Array (ALMA) zeigt uns zwei gewaltige, gekräuselte Jets aus dichtem Gas, die in fast perfekter Symmetrie von einer einzigen Quelle in der Bildmitte ausgestrahlt werden. Ihr Ursprung ist ein extrem junger Stern – auch Protostern genannt – der gerade seine lange Reise auf dem Weg antritt, ein Stern wie unsere Sonne zu werden.
Das Sternbaby mit der Bezeichnung CARMA-7 und seine Jets sind etwa 1400 Lichtjahre von der Erde entfernt und sind Teil des Serpens South Sternhaufens. Dieser dichte Sternhaufen, den man erwartungsgemäß im Sternbild Schlange (lat. Serpens) findet, beherbergt mindestens 30 weitere Protosterne, die alle gerade im Entstehen begriffen sind und für die Astronomen ein perfektes Laboratorium darstellen, um die Interaktionen von Sternen mit ihrer Umgebung zu untersuchen.
Die ersten Schritte im Leben eines Sterns werden noch nicht gut verstanden. Aber Astronomen vermuten, dass diese knotigen, rauchigen Jets von periodischen Gasausbrüchen erzeugt werden, die mit enormer Geschwindigkeit von CARMA-7 in seine Umgebung ausgestoßen werden. Diese Eruptionen werden durch Materie ausgelöst, die aus einer umgebenden Staubscheibe auf den Protostern fällt. Die vom jungen Stern ausströmenden Jets kollidieren mit interstellarer Materie, wodurch sie verlangsamt und zerstreut werden. Eines Tages wird diese Materie wiederum kollabieren und eine weitere Generation von Sternen hervorbringen.
Bildnachweis:ESO/A. Plunkett
Über das Bild
| ID: | potw1545a |
| Sprache: | de-at |
| Typ: | Beobachtung |
| Veröffentlichungsdatum: | 9. November 2015 10:00 |
| Größe: | 3536 x 1172 px |
Über das Objekt
| Name: | Serpens Constellation |
| Typ: | Milky Way : Star : Evolutionary Stage : Protostar |
| Entfernung: | 1400 Lichtjahre |
Bildschirm-Hintergrundbilder
Farben & Filter
| Spektralbereich | Wellenlänge | Teleskop |
|---|---|---|
| Millimeter Band 6 | 1.31 mm | Atacama Large Millimeter/submillimeter Array |
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