Observations of NGC 7027 in the near infrared

Details Observations of NGC 7027 in the near infrared Observations of NGC 7027 in the near infrared

Jun 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978pasp...90..257s&link_type=abstract

Astronomical Society of the Pacific, Publications, vol. 90, June-July 1978, p. 257-261. Research supported by the National Rese

Astronomy and Astrophysics

Astronomy

11

Astronomical Spectroscopy, Infrared Astronomy, Near Infrared Radiation, Planetary Nebulae, H Lines, Helium, Infrared Spectra, Line Spectra

Scientific paper

An independent absolute flux calibration of the planetary nebula NGC 7027 is presented based on the flux of the Paschen-beta line of hydrogen at 12,818 A. Absolute fluxes are also determined for several other lines in the spectral region from 0.86 to 1.65 microns observed with a resolution of 1.5 per cm, including He I (12,785 and 10,830 A), Paschen-gamma (10,939 A), He II (10,123 A), and forbidden S III (9532 and 9069 A). The results confirm the absolute flux measurement of Miller and Mathews (1972) for the H-beta line and show that there is no accumulated wavelength-dependent error in line strengths extended redward from H-beta. An electron temperature of about 11,600 K is computed from the intensities of the forbidden S III lines for the region of NGC 7027 where sulfur is doubly ionized. Results of an unsuccessful search for three strong lines of HeH(+) in the region from 1.1 to 1.6 microns are also reported which imply that the unidentified feature previously detected near 3.3 microns cannot be due to HeH(+).

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