The Planetary Nebula K 648 in the Globular Cluster M15
Our team has obtained HST WFPC2 images of this prototypical example
of a planetary nebula in a globular cluster. K 648 was cataloged as a star
by Kustner, but identified spectroscopically as a planetary nebula by Pease,
both in the 1920's.
General WFPC2 view of M15 and K 648 (located near top left edge)
Closeup false-color image of the planetary nebula (red = [N
II], green = H-alpha, blue = [O III])
for paper (Alves, Bond, & Livio; Astronomical Journal 120,
2044, 2000). The paper deals with the (non)-variability of the
central star, morphology of the nebula, and evolution of the nucleus. The
nucleus is shown to have an unusually high mass of 0.60 Msun, and we argue
that it must have undergone mass augmentation in a binary that has undergone
mass transfer or a merger.
Last updated 2000 October 19