The 680-1050 NM recombination spectrum of hydrogen and helium in the planetary nebula NGC7027

Details The 680-1050 NM recombination spectrum of hydrogen and helium in the planetary nebula NGC7027 The 680-1050 NM recombination spectrum of hydrogen and helium in the planetary nebula NGC7027

Nov 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26a...206..298p&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 206, no. 2, Nov. 1988, p. 298-315.

Astronomy and Astrophysics

Astrophysics

26

Astronomical Spectroscopy, Hydrogen Recombinations, Near Infrared Radiation, Planetary Nebulae, Astronomical Models, Charge Coupled Devices, H Beta Line, Helium, Particle Collisions, Paschen Series

Scientific paper

We report on CCD observations of over one hundred recombination lines in the 680-1050 nm spectrum of the planetary nebula NGC 7027. These lines, many of which are detected or identified for the first time, belong to the (3, n) series of H I (Paschen), the (5, n) and (6, n) series of He II, and to eight out of the ten (3l', nl) series of He I. Most of these series as well as the underlying continuum, are essentially in agreement with case B recombination theory within the 5-10% observational uncertainties, although the He I(31S, n1P) series is significantly weaker, as expected. The physical conditions allowed by the data include those deduced from a photoionization model by Gruenwald and Pequignot (1988) but exclude those deduced from observation of the Balmer and Pickering decrements by Kaler et al. (1976). Complete agreement of observation with theory requires that a number of lines of the end of the Paschen series are blended with unidentified features. An excess of continuum is discovered shortward of ˜760 nm. The He I series allow to show that the reference line (23P, 43D) λ447.15 nm is not collisionally amplified by more than 10% in this nebula.

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