Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999jkas...32...55h&link_type=abstract
Journal of the Korean Astronomical Society, vol. 32, no. 1, pp. 55-63
Astronomy and Astrophysics
Astronomy
5
Ism: Chemical Abundances, Ism: Planetary Nebulae, Ism: Individual (Ngc 6537)
Scientific paper
NGC 6537 is an extremely high excitation bipolar planetary nebula. It exhibits a huge range of excitation from lines of [N I] to [Si VI] or [Fe VII], i.e. from neutral atoms to atoms requiring an ionization potential of 167eV. Its kinematical structures are of special interest. We are here primarily concerned with its high resolution spectrum as revealed by the Hamilton Echelle Spectrograph at Lick Observatory (resolution 0.2 A,) and supplemented by UV and near-UV data. Photoionization model reproduces the observed global spectrum of NGC 6537, the absolute H beta flux, and the observed visual or blue magnitude fairly well. The nebulosity of NGC 6537 is likely to be the result of photo-ionization by a very hot star of Teff 180,000 K, although the global nebular morphology and kinematics suggest an effect by strong stellar winds and resulting shock heating. NGC 6537 can be classified as a Peimbert Type I planetary nebula. It is extremely young and it may have originated from a star of about 5 M_sun.
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