Colère stellaire : L’explosion énergétique d’une étoile naissante traverse l’espace.

Herbig-Haro HH34

Image du télescope spatial Hubble de l’objet Herbig-Haro HH34. Crédit : ESA/Hubble & ; NASA, B. Nisini

L’explosion énergétique d’une étoile naissante traverse cette image du ;” data-gt-translate-attributes=”[{” attribute=””>NASA/ESA Hubble Space Telescope. This stellar tantrum — produced by an extremely young star in the earliest phase of formation — consists of an incandescent jet of gas traveling at supersonic speeds. As the jet collides with material surrounding the still-forming star, the shock heats this material and causes it to glow. The result is the colorfully wispy structures, which astronomers refer to as Herbig–Haro objects, billowing across the lower left of this image.

Herbig–Haro objects are seen to evolve and change significantly over just a few years. This particular object, called HH34, was previously captured by Hubble between 1994 and 2007 (see image below), and again in glorious detail in 2015. HH34 resides approximately 1250 light-years from Earth in the Orion Nebula, a large region of star formation visible to the unaided eye. The Orion Nebula is one of the closest sites of widespread star formation to Earth, and as such has been pored over by astronomers in search of insights into how stars and planetary systems are born.

The data in this image are from a set of Hubble observations of four nearby bright jets with the Wide Field Camera 3 taken to help pave the way for future science with the NASA/ESA/CSA James Webb Space Telescope. Webb — which will observe at predominantly infrared wavelengths — will be able to peer into the dusty envelopes surrounding still-forming protostars, revolutionizing the study of jets from these young stars. Hubble’s high-resolution images of HH34 and other jets will help astronomers interpret future observations with Webb.

Stellar Jet HH 34

These images taken by the NASA/ESA Hubble Space Telescope show how a bright, clumpy jet, ejected from a young star, has changed over time. The jet, called Herbig-Haro 34 (or HH 34), is a signpost of star birth. Several bright regions in the clumps signify where material is slamming into other patches of material, heating up, and glowing. The images show that a couple of bright areas on the right faded over time, as heated material cooled. Two regions at left, however, brightened over the 14-year span of observations, pinpointing fresh collision sites. Ejected episodically by a young star like cannon salvos, the blobby material in HH 34 zips along at more than 700,000 kilometers per hour. The speedy jet is confined to narrow beams by the powerful stellar magnetic field.
These images are part of a series of time-lapse movies astronomers have made showing the motion of several Herbig-Haro jets over time. The movies were stitched together from images taken over a 14-year period by Hubble’s Wide Field Planetary Camera 2. Hubble followed the HH 34 jets over three epochs, 1994, 1998, and 2007.
Credit: NASA, ESA, and P. Hartigan (Rice University)

Leave a Comment