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The Circumstellar Extinction of Planetary Nebulae
Robin Ciardullo, George H. Jacoby
We analyze the dependence of circumstellar extinction on core mass for the brightest planetary nebulae (PNe) in the Magellanic Clouds and M31. We show that in all three galaxies, a…
Chemical Abundances of Planetary Nebulae in the Bulge and Disk of M31
George H. Jacoby, Robin Ciardullo
We derive abundances and central star parameters for 15 planetary nebulae (PNe) in M31: 12 in the bulge and 3 in a disk field 14 kpc from the nucleus. No single abundance value cha…
A Survey for Low Surface Brightness Dwarf Galaxies Around M31
Taft E. Armandroff, James E. Davies, George H. Jacoby
By applying a digital filtering technique to 1550 square degrees of the POSS-II in the vicinity of M31, we found two previously unidentified very low surface brightness dwarf galax…
A Survey for Low-Surface-Brightness Galaxies Around M31. I. The Newly Discovered Dwarf Andromeda V
Taft E. Armandroff, James E. Davies, George H. Jacoby
We present images and a color-magnitude diagram for And V, a new dwarf spheroidal companion to M31 that was found using a digital filtering technique applied to 1550 square degrees…
Intracluster Planetary Nebulae in the Virgo Cluster I. Initial Results
John Feldmeier, Robin Ciardullo, George Jacoby
We report the initial results of a survey for intracluster planetary nebulae in the Virgo Cluster. In two 16' x 16' fields, we identify 69 and 16 intracluster planetary nebula cand…