Protostar HH-34 in Orion

Three-colour composite of the young object Herbig-Haro 34 (HH-34), now in the protostar stage of evolution. It is based on CCD frames obtained with the FORS2 instrument in imaging mode, on November 2 and 6, 1999.

This object has a remarkable, very complicated appearance that includes two opposite jets that ram into the surrounding interstellar matter. This structure is produced by a machine-gun-like blast of "bullets" of dense gas ejected from the star at high velocities (approaching 250 km/sec). This seems to indicate that the star experiences episodic "outbursts" when large chunks of material fall onto it from a surrounding disc.

HH-34 is located at a distance of approx. 1,500 light-years, near the famous Orion Nebula, one of the most productive star birth regions. Note also the enigmatic "waterfall" to the upper left, a feature that is still unexplained.

The composite of three images was taken through three different filters : B (wavelength 429 nm; Full-Width-Half-Maximum (FWHM) 88 nm; exposure time 10 min; here rendered as blue), H-alpha (centered on the hydrogen emission line at wavelength 656 nm; FWHM 6 nm; 30 min; green) and S II (centrered at the emission lines of inonized sulphur at wavelength 673 nm; FWHM 6 nm; 30 min; red) during a period of 0.8 arcsec seeing. The field shown measures 6.8 x 6.8 arcmin and the images were recorded in frames of 2048 x 2048 pixels, each measuring 0.2 arcsec. North is up; East is left.

Herkunftsnachweis:

ESO

Über das Bild

ID:eso9948b
Typ:Beobachtung
Veröffentlichungsdatum:17. November 1999
Dazugehörige Veröffentlichungen:eso9948
Größe:4961 x 4961 px

Über das Objekt

Name:HH 34
Typ:Milky Way : Star : Evolutionary Stage : Protostar
Entfernung:1500 Lichtjahre
Constellation:Orion
Kategorie:Nebulae

Bildformate

Großes JPEG
4,3 MB

Skalierbar


Bildschirm-Hintergrundbilder

1024x768
296,7 KB
1280x1024
469,4 KB
1600x1200
655,2 KB
1920x1200
758,2 KB
2048x1536
984,3 KB

Koordinaten

Position (RA):5 35 27.97
Position (Dec):-6° 25' 45.39"
Field of view:6.71 x 6.71 arcminutes
Orientierung:Die Nordrichtung liegt 1.6° rechts zur Vertikale

Farben & Filter

SpektralbereichWellenlängeTeleskop
Optisch
B
429 nmVery Large Telescope
FORS2
Optisch
H-alpha
656 nmVery Large Telescope
FORS2
Optisch
SII
673 nmVery Large Telescope
FORS2