The open cluster NGC 2818 and its associated planetary nebula

Details The open cluster NGC 2818 and its associated planetary nebula The open cluster NGC 2818 and its associated planetary nebula

Dec 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989aj.....98.2146p&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 98, Dec. 1989, p. 2146-2155. Research supported by NSERC.

Astronomy and Astrophysics

Astronomy

15

Astronomical Photometry, Open Clusters, Planetary Nebulae, Charge Coupled Devices, Color-Magnitude Diagram, Interstellar Extinction, Ubv Spectra

Scientific paper

New CCD UBV photometry of the open cluster NGC 2818 central region indicates that previously derived values of distance and reddening for the cluster have been considerably overestimated, leading to erroneous values for the physical parameters of its associated planetary nebula (PK 261 + 8.1 deg). The analysis of the new data yields E(B-V) = 0.18 + or - 0.03 and V(0)-M(v) = 11.80 + or - 0.2 (2.3 + or - 0.2 kpc) for the cluster's color excess and distance modulus, respectively. If cluster membership is assumed for the planetary nebula, the above estimates result in physical parameters that compare better with those of a typical planetary nebula in the Galaxy and the Magellanic Clouds.

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