A study of the Herbig-Haro object HH 120 and the associated cometary globule CG 30

Astronomy and Astrophysics – Astronomy

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Cometary Atmospheres, Cosmic Dust, Herbig-Haro Objects, Infrared Astronomy, Stellar Spectrophotometry, Electron Density (Concentration), Electron Energy, Emission Spectra, Line Spectra, Pre-Main Sequence Stars, Radial Velocity, Stellar Evolution

Scientific paper

Infrared and spectroscopic observations are presented of a new Herbig-Haro object, here named HH 120, in the cometary globule CG 30. The emission line spectrum indicates a very low degree of excitation of the same order as that found for HH 47, HH 7, and HH 11. From several spectra a radial velocity of -42 km-1±12 km s-1 is deduced and the electron temperature, Te, and electron number density, Ne, are found to be 9100K±400K and 1700 cm-3±600 cm-3, respectively. Infrared scans of CG 30 revealed five sources, two of which are very close to HH 120. It is argued that one of them, CG 30-IRS4, is the source of energy producing HH 120 and an associated reflection nebula.

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