Discovery of Herbig-Haro Objects and Molecular Hydrogen Jets near BOK Globule CB 34

Details Discovery of Herbig-Haro Objects and Molecular Hydrogen Jets near BOK Globule CB 34 Discovery of Herbig-Haro Objects and Molecular Hydrogen Jets near BOK Globule CB 34

Dec 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995apj...454..850m&link_type=abstract

Astrophysical Journal v.454, p.850

Astronomy and Astrophysics

Astronomy

22

Ism: Individual Alphanumeric: Cb 34, Ism: Jets And Outflows, Stars: Pre-Main-Sequence, Infrared: Ism: Lines And Bands, Ism: Globules

Scientific paper

We report the discovery of four new Herbig-Haro objects (HH 290S, HH 290N1, HH 290N2, and HH 291) and molecular hydrogen jets associated with the star formation activity seen in Bok globule CB 34. The HH objects were discovered in narrowband [S II] and Hα CCD images.
Two of these objects are also seen in a corresponding 2.12 microns V = 1-0 5(1) H2 near-infrared image confirming their shock emission nature. These objects are likely to be driven by an embedded near-infrared source belonging to the aggregate of young stellar objects recently found by Alves & Yun.
Additional shock emission features appear in the molecular hydrogen image. We identify two sets of infrared structures extending for about 0.15 pc and toward the region of highest extinction in the cloud. The features in each set are well aligned and are likely to trace the presence of embedded jets with high degrees of collimation.
Taken together, these features delineate three separate chains of shock-excited nebulae. One chain is seen in both the optical and near-infrared images. Of the other two chains, one is seen partly in the optical and partly in the infrared, and the other is seen only in the infrared images.

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