Membership of the Planetary Nebula Abell 8 in the Open Cluster Bica 6 and Implications for the PN Distance Scale

Details Membership of the Planetary Nebula Abell 8 in the Open Cluster Bica 6 and Implications for the PN Distance Scale Membership of the Planetary Nebula Abell 8 in the Open Cluster Bica 6 and Implications for the PN Distance Scale

May 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21812608t&link_type=abstract

American Astronomical Society, AAS Meeting #218, #126.08; Bulletin of the American Astronomical Society, Vol. 43, 2011

Astronomy and Astrophysics

Astronomy

Scientific paper

The potential link between the newly discovered open cluster Bica 6 and the planetary nebula (PN) Abell 8 (PN G167.0-00.9) proposed by Bonnato et al. (2008) is confirmed on the basis of new UBVRI CCD photometry for the cluster and spectroscopic observations of its brightest stars, in conjunction with an analysis of 2MASS data for the cluster. The reddening, estimated distance, and radial velocity (+58 ± 6 km/s) of Abell 8 are a close match to the parameters derived for Bica 6: E(B-V)(B0) ≈ 0.40, d = 1.6 kpc, Vr = +57 ±4 km/s (11 stars). The radial velocity match is particularly interesting given that the velocities are more than 50 km/s larger than expected for Galactic orbital motion at l = 167°. The cluster age of 1 billion years implies a mass of ˜2.5-3 M&sun; for the planetary nebula progenitor star, although the picture is complicated by a few blue stragglers as likely cluster members. The central star of the PN is an optical double in the 2MASS survey, with the companion indicated to be a cluster M dwarf. Abell 8 is a highly evolved PN containing a low luminosity central star (Mv ≈ +8), with a distance implied by cluster membership favoring the short PN distance scale.

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