Ultraviolet continuum and H/sub 2/ fluorescent emission in Herbig-Haro objects 43 and 47
The results of International Ultraviolet Explorer (IUE) short-wavelength spectra of the low-excitation Herbig-Haro objects HH 43 and HH 47 are reported. In HH 43 a number of emission lines in the Lyman band of H/sub 2/ from the excited state /sup 1/..sigma../sup +//sub u/, ..nu..' = 1, J' = 4 are observed. The lines are produced by fluorescence from the H Ly..cap alpha.. line which pumps the lower state /sup 1/..sigma../sup +//sub g/, ..nu..'' = 2.J'' = 5 which in turn is excited by a low-velocity shock wave. No evidence of emission from highly ionized gas is present in the UV spectra. Both objects exhibit a UV continuum which peaks in the vicinity of 1500 A and which is probably caused by hydrogen two-photon emission enhanced by collisional excitation in a low-velocity shock.
- Research Organization:
- Physics Department, University of Missouri, St. Louis, MO
- OSTI ID:
- 5960801
- Journal Information:
- Astrophys. J., Lett. Ed.; (United States), Journal Name: Astrophys. J., Lett. Ed.; (United States) Vol. 268:1; ISSN AJLEA
- Country of Publication:
- United States
- Language:
- English
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71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
CHEMISTRY
COSMOCHEMISTRY
ELECTROMAGNETIC RADIATION
ELEMENTS
EMISSION SPECTRA
ENERGY LEVELS
EXCITED STATES
FLUIDS
GASES
HYDROGEN
IONIZED GASES
MULTI-PHOTON PROCESSES
NEBULAE
NONMETALS
PROTOSTARS
RADIATIONS
SHOCK WAVES
SPACE VEHICLES
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ULTRAVIOLET RADIATION
ULTRAVIOLET SPECTRA
VEHICLES