Discovery of two Herbig-Haro objects in the small dark cloud D291.4-0.2 in Carina

Astronomy and Astrophysics – Astronomy

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Dark Matter, Herbig-Haro Objects, Molecular Clouds, Charge Coupled Devices, Emission Spectra, Infrared Astronomy Satellite, Interstellar Extinction, Point Sources

Scientific paper

The discovery of two Herbig-Haro (HH) objects, designated HH 137 and 138, towards eastern Carina in a dark small cloud is reported. Their structure is investigated on the basis of narrow-band CCD images obtained in red forbidden S II lines, the H-alpha + forbidden N II emission, and the adjacent continuum. HH 137 consists of many knots distributed roughly in the east-west direction, while HH 138 has fewer knots in a similar elongation. HH 138 is located roughly on the extension of the axis of HH 137, but it is not clear whether they make a physically associated HH pair. The westernmost part of HH 137 appears to correspond to the working surface of the outflow, and one of the knots, which is bright in H-alpha + forbidden N II, is probably the Mach disk.

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