Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...178..227i&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 178, no. 1-2, May 1987, p. 227-236.
Astronomy and Astrophysics
Astrophysics
47
Astronomical Photography, Astronomical Spectroscopy, H Alpha Line, Planetary Nebulae, Fabry-Perot Interferometers, Stellar Color, Stellar Luminosity, Stellar Spectra
Scientific paper
Two large (diam. ≥ 13arcmin) nearby (D ≤ 0.33 kpc) planetary nebula (PN) were discovered by use of Kiso plates and POSS prints. Both are nebulae of very late evolutionary state with Hα surface brightnesses of ≥25.1 mag/arcsec2, linear radii r ≥ 0.56 pc and electron densities ne< 10 cm-3. The expansion velocities are small, Vexp≤ 8 km s-1 in [O III]. Also, the absolute magnitudes of the central stars are very small: one (Mv = +10.0) appears even to be of extremely low luminosity with log L/L_sun; ≤ 1.10. The detection of these nearby objects motivated the authors also to investigate the local PN population including all close PN discovered after the editing of the PK-catalogue. The total number of PN in the Galaxy is in excess of 105 - the overwhelming majority obviously are planetary nebulae in very late stages of evolution.
Ishida Keiichi
Weinberger Ram
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