News Release Archive:

News Release 717 of 1051

October 7, 1999 12:00 PM (EDT)

News Release Number: STScI-1999-35

Hubble Heritage Project's First Anniversary


Image: Herbig Haro 32: Jets of Material Ejected From a Young Star

Herbig Haro 32: Jets of Material Ejected From  a Young StarSTScI-PRC1999-35

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HH 32 is an excellent example of a "Herbig-Haro object," which is formed when young stars eject jets of material back into interstellar space. This object, about 1,000 light-years from Earth, is somewhat older than Hubble's variable nebula, and the wind from the bright central star has already cleared much of the dust out of the central region, thus exposing the star to direct view. Many young stars, like the central object in HH 32, are surrounded by disks of gas and dust that form as additional material is attracted gravitationally from the surrounding nebula. Material in the disk gradually spirals in toward the star and eventually some of it accretes onto the star, increasing its mass. A fraction of the gas, however, is ejected perpendicularly to the disk at speeds near 200 miles per second, and forms two oppositely directed jets. These jets plow into the surrounding nebula, producing strong shock waves that heat the gas and cause it to glow in the light of hydrogen atoms (green) and sulfur ions (blue), several other atoms and ions, and sometimes radiation from the exciting star that is reflected by the surrounding gas (red). This glow is called a Herbig-Haro object, in honor of astronomers George Herbig and Guillermo Haro, who did much of the early work in this area in the 1950's. The jet on the top side, whose furthest extent is about 0.2 light-year from the star, is pointed more nearly in our direction, while the opposite jet on the bottom lies on the far side of the star and is fainter either because it is partially obscured by dust surrounding the star or because there is much less material in front of the star.

The Hubble Heritage team (NASA/AURA/STScI) made this image from observations of Herbig-Haro 32 acquired by Salvador Curiel, Jorge Cant", Alejandro Raga, (UNAM), Alberto Noriega-Crespo (IPAC), and collaborators.

Object Names: Herbig Haro 32, HH 32

Image Type: Astronomical

Image Credit: NASA and The Hubble Heritage Team (AURA/STScI).


The above image is part of a montage:

Montage Image: Hubble Heritage Project's First Anniversary Image Type: Astronomical Hubble Heritage Project's First Anniversary Hubble's Variable Nebula (NGC 2261) Image Type: Astronomical Hubble's Variable Nebula (NGC 2261)PRC1999-36 NGC 2346 Image Type: Astronomical NGC 2346PRC1999-37 NGC 2440 Image Type: Astronomical NGC 2440PRC1999-38

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