Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988mnras.232..615r&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 232, June 1, 1988, p. 615-621.
Astronomy and Astrophysics
Astronomy
22
Emission Spectra, H Ii Regions, Hydrogen Clouds, Line Spectra, Molecular Excitation, Planetary Nebulae, Hot Stars, Stellar Mass Ejection, Stellar Winds, Wind Velocity
Scientific paper
The authors report observations of the υ = 1-0 S(1) line of molecular hydrogen in the high-excitation planetary nebula NGC 2440. The emission is particularly strong at the positions of the two bright condensations which lie well within the H II region and close to the position of the very hot T ≈ 350000K central star. The emission is consistent with an excited molecular hydrogen mass of ≈ 2 - 4×10-5M_sun; in the condensations, and the authors estimate the total mass of excited molecular hydrogen associated with the H II region to be ≈6.1×10-3M_sun;. They show that radiation pressure from the central star is insufficient to excite the S(1) line emission. The authors also show that a stellar-wind driven shock would imply a mass loss rate of 3×10-7M_sun; yr-1 if they adopt a wind velocity of 2000 km s-1.
Atherton P. D.
Reay N. K.
Walton Nic A.
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