Planetary nebulae and H II regions in NGC 3109

Details Planetary nebulae and H II regions in NGC 3109 Planetary nebulae and H II regions in NGC 3109

Jan 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aj....103...54r&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 103, Jan. 1992, p. 54-59. Research supported by NSERC.

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25

H Ii Regions, Planetary Nebulae, Spiral Galaxies, Astronomical Spectroscopy, Distance, Star Formation, Stellar Luminosity

Scientific paper

The first planetary nebulae have been discovered in the late-type spiral galaxy NGC 3109 from CFHT images in the light of forbidden O III line 5007 and H-alpha. From their luminosities, the best estimate of the distance modulus is 25.96 super (+0.1)(-0.4) mag (1.6 Mpc), with 26.17 +/-0.37 mag (1.7 +/-0.4 Mpc) being a hard upper limit. A consideration of all other distance estimates for NGC 3109 indicates that 26.0 +/-0.4 mag is the best estimate for the true distance modulus. Compared to other galaxies, the number of planetary nebulae found per unit luminosity is anomalously high.

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