M 1-77 : a peculiar planetary nebula.
Abstract
Photographic, spectroscopic and photometric observations of M1-77 indicate that nebular emissions of forbidden line O III are absent, and high dispersion spectra of the nebula yield an upper limit gas expansion velocity of 10 km/sec. In view of these results, it is concluded that M1-77 is a low excitation planetary nebula surrounding a cold central star whose mass is close to the lower boundary for planetary nebulae nuclei.
- Publication:
-
Astronomy and Astrophysics
- Pub Date:
- July 1983
- Bibcode:
- 1983A&A...123..147S
- Keywords:
-
- Planetary Nebulae;
- Stellar Mass;
- Astronomical Photography;
- Astronomical Photometry;
- Astronomical Spectroscopy;
- Interstellar Extinction;
- Red Giant Stars;
- Astronomy