Astronomy and Astrophysics – Astronomy
Scientific paper
May 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apj...256..120l&link_type=abstract
Astrophysical Journal, Part 1, vol. 256, May 1, 1982, p. 112-119.
Astronomy and Astrophysics
Astronomy
14
Andromeda Galaxy, Astronomical Photography, Galactic Clusters, Galactic Structure, Local Group (Astronomy), Planetary Nebulae, Radial Velocity, Velocity Modulation, Brightness, Interstellar Extinction, Luminosity, Magellanic Clouds, Star Distribution, Stellar Evolution
Scientific paper
A sequence of velocity-modulated photographs made with a camera consisting of a temperature-tuned, 2.1 A (FWHM) O III forbidden line 5007 A interference filter, a two-stage cooled image intensifier, and a calibrating photomultiplier, was used to find and measure the radial velocities of 42 faint planetary nebulae in the center of M31. Of the 42, 19 are new identifications. After deriving a planetary-to-luminosity ratio (PLR) value of 69 + or - 9 for the luminosity corresponding to an integrated blue magnitude of 8.37, the PLR is combined with M31's integrated magnitude to estimate that there are approximately 2800 + or - 350 nebulae in the first 3 mag of M31's luminosity function, and 21,000 planetary nebulae within 8 mag of the brightest nebulae.
Ford Holland C.
Lawrie D. G.
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