Astronomy and Astrophysics, volume 301, 537-544 (1995/9-2)
HST imaging of the planetary nebula K 648 in M 15.
BIANCHI L., FORD H., BOHLIN R., PARESCE F. and DE MARCHI G.
Abstract (from CDS):
Two images of the Planetary Nebula K 648 in M 15 were taken in the PC mode of the WFPC1 camera on HST in the narrow [OIII] and Hα filters, and an image in [OIII] light with the FOC. This object, never resolved before in ground-based data, is resolved in the HST images. It shows a bipolar structure: a spherical shell containing a brighter torus, of about 2.5 arcsec diameter. A surrounding fainter spherical emission extending to about 5 arcsec diameter is detected. The measured diameter allows to determine better than was previously possible the mass of the ionized gas, Mgas≃0.07±0.02M☉. The stellar and nebular parameters derived from the HST data and archive IUE data, confirm a distance of K 648 consistent with that of M 15. The morphological structure can be studied in the resolved HST images. The observed intensity distribution is modeled with a 3-D density distribution with cylindrical symmetry, the equatorial plane being close to the line of sight. On reanalysing IUE archive data, we derive the following parameters for the central star: Teff=35000K, consistent with most previous findings, M*=0.58±0.02M☉, R*=1.9R☉, L=4680L☉, Vedge=-1630km/s of the wind line, Vesc=300km/s. The object is still evolving towards hotter temperatures in the constant-luminosity post-AGB phase.
planetary nebulae: individual: K 648 (PN G065.0-27.3) - stars: population II - stars: post AGB - stars: evolution - ultraviolet: ISM
Status at CDS:
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