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Planetary nebulae as standard candles. VI - A test in the Magellanic Clouds
Jacoby, George H.; Walker, Alistair R.; Ciardullo, Robin
AA(Kitt Peak National Observatory, Tucson, AZ), AB(Kitt Peak National Observatory, Tucson, AZ), AC(Observatorio Interamericano de Cerro Tololo, La Serena, Chile)
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 365, Dec. 20, 1990, p. 471-477. (ApJ Homepage)
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NASA/STI Keywords:
Interstellar Extinction, Luminosity, Magellanic Clouds, Planetary Nebulae, Standards, Astronomical Photometry, Brightness Distribution, Distance
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The forbidden O III line 5007 fluxes of the brightest planetaries in the LMC (102 objects) and SMC (31 objects) were measured using narrow-band imaging at the CTIO 0.9 m telescope. The fluxes agree to about 5 percent with photoelectric measurements available in the literature (31 objects); agreement is much worse for objects with only spectrophotometric observations. Using the fluxes for the complete sample of bright LMC planetaries, a distance was derived using the planetary nebula luminosity function. The distance modulus was found to be 18.44 + or - 0.18. This agrees superbly with the Cepheid distance modulus of 18.47 + or - 0.15 and estimates between 18.2 and 18.5 from RR Lyrae stars, Miras, QB stars, and clusters.

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