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Date and Time of the Query: 2019-05-25 T10:05:33 PDT
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For refcode 1993ApJ...419..479C:
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1993ApJ...419..479C A COMPARISON OF THE PLANETARY NEBULA LUMINOSITY FUNCTION AND SURFACE BRIGHTNESS FLUCTUATION DISTANCE SCALES ROBIN CIARDULLO Department of Astronomy and Astrophysics, Penn State University, 525 Davey Lab, University Park, PA 16802 GEORGE H. JACOBY Kitt Peak National Observatory, National Optical Astronomy Observatories, P.O. Box 26732, Tucson, AZ 85726 AND JOHN L. TONRY Massachusetts Institute of Technology, 6-204, Cambridge, MA 02139 Received 1993 February 8; accepted 1993 June 28 ABSTRACT Two of the best techniques for measuring distances greater than ~3 Mpc are the planetary nebula luminosity function (PNLF) and the surface brightness fluctuation (SBF) method. We compare the results of both methods and analyze the internal and external errors associated with the measurements. We find that the PNLF distances are systematically larger than the SBF distances by 0.07 +/- 0.03 mag, but this error can be entirely attributed to uncertainties in the Local Group calibrations which both methods employ. After correcting for this effect, we find the random scatter in the difference between the PNLF and SBF distance determinations, {DELTA} = (m - M)_SBF_ - (m - M)_PNLF_ = 0.17 mag, is in exact agreement with that predicted from the internal uncertainties of the methods. We show that {DELTA} is not measurably correlated with such parameters as galaxy color, metallicity, specific PN density, and specific globular cluster frequency, but does correlate slightly with galactic absolute B magnitude. We discuss the reality of this correlation and show that the trend is not important for extragalactic distance applications. Subject headings: distance scale - galaxies: distances and redshifts - galaxies: photometry - galaxies: stellar content - planetary nebulae: general
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