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Title:
Planetary nebulae as standard candles. VII - A test versus Hubble type in the NGC 1023 group
Authors:
Ciardullo, Robin; Jacoby, George H.; Harris, William E.
Affiliation:
AA(Pennsylvania State University, University Park), AB(Kitt Peak National Observatory, Tucson, AZ), AC(McMaster University, Hamilton, Canada)
Publication:
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 383, Dec. 20, 1991, p. 487-497. (ApJ Homepage)
Publication Date:
12/1991
Category:
Astronomy
Origin:
STI
NASA/STI Keywords:
PLANETARY NEBULAE, SPIRAL GALAXIES, STANDARDS, CHARGE COUPLED DEVICES, DISTANCE, SKY SURVEYS (ASTRONOMY), STELLAR EVOLUTION, STELLAR LUMINOSITY, STELLAR SPECTROPHOTOMETRY
DOI:
10.1086/170807
Bibliographic Code:
1991ApJ...383..487C

Abstract

The results of a forbidden O III 5007 survey for planetary nebulae in the NGC 1023 Group are presented. In all, 143 planetary nebula candidates were detected: 110 in the SBO galaxy NGC 1023 and 33 in the halo of the edge-on Sb spiral NGC 891. Using a statistically complete and homogeneous sample of planetary nebulae and the procedures described in previous papers in the series, distances to these galaxies are derived using the planetary nebula luminosity function (PNLF). After correcting for foreground extinction by using the estimated reddening values of Burstein and Heiles, the distance moduli for NGC 1023 and NGC 891 are found to be 29.97 +/- 0.14 and 29.97 +/- 0.16, respectively. The similarity of these distances demonstrates the insensitivity of the PNLF to galaxy Hubble types and population age, and again confirms it as one of the best extragalactic standard candles.

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