Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...383..487c&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 383, Dec. 20, 1991, p. 487-497.
Astronomy and Astrophysics
Astronomy
67
Planetary Nebulae, Spiral Galaxies, Standards, Charge Coupled Devices, Distance, Sky Surveys (Astronomy), Stellar Evolution, Stellar Luminosity, Stellar Spectrophotometry
Scientific paper
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.
Ciardullo Robin
Harris William E.
Jacoby George H.
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