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Title:
The absolute H-beta flux from NGC 7027
Authors:
Shaw, R. A.; Kaler, J. B.
Affiliation:
AA(Illinois, University, Urbana, IL), AB(Illinois, University, Urbana, IL)
Publication:
Astrophysical Journal, Part 1, vol. 261, Oct. 15, 1982, p. 510-512. (ApJ Homepage)
Publication Date:
10/1982
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
ASTRONOMICAL SPECTROSCOPY, H BETA LINE, PLANETARY NEBULAE, SPECTROPHOTOMETRY, ANOMALIES, CONTINUOUS SPECTRA, FLUX QUANTIZATION, INFRARED ASTRONOMY
Comment:
A&AA ID. AAA032.135.032
DOI:
10.1086/160361
Bibliographic Code:
1982ApJ...261..510S

Abstract

The value of log F(H-beta) for NGC 7027 is to be found within 0.01 of -10.12 from a combination of new interference filter measurements and older independent determinations, which is 18% higher than the current standard value from Miller and Mathews (1972). Substitution of the new flux in previous analyses yields an electron temperature from the Balmer continuum within 2500 K of 15,000 K, and an H-beta extinction of within 0.05 of 1.36 from the radio flux density. The latter now agrees with the optical value of within 0.02 of 1.37, implying that the ratio of total to selective absorption is standard, at three. The slope of the continuum in the optical now agrees better with theoretical prediction, although there is still an anomaly in the infrared. The hydrogen and He II Zanstra temperatures are equal at 180,000 K for a hypothetical central star at magnitude of 16.3, which is too faint to be detected by the measurements discussed here.

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