Study of planetary nebula K1-2 and its variable nucleus

Details Study of planetary nebula K1-2 and its variable nucleus Study of planetary nebula K1-2 and its variable nucleus

Oct 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982mnras.201...21k&link_type=abstract

Monthly Notices of the Royal Astronomical Society, vol. 201, Oct. 1982, p. 21-26.

Astronomy and Astrophysics

Astronomy

6

Astronomical Spectroscopy, Blue Stars, Planetary Nebulae, Subdwarf Stars, Variable Stars, Astronomical Photography, Periodic Variations, Radiant Flux Density, Stellar Luminosity, Stellar Temperature, Temperature Distribution, Visible Spectrum

Scientific paper

The prime focus (f/3) of the 3.6 m telescope of the European Southern Observatory at La Silla, Chile was used to make photographic, photometric, and first spectroscopic observations of K1-2. Observations indicate that K1-2 is a high excitation old planetary nebula at 2.4 kpc. Its blue subdwarf nucleus has a luminosity of 500-1000 solar masses, an effective temperature (He II) of 91,000-79,000 K, and a radius of 0.09-0.17 solar masses. An optical variability of the central star in the range of 16.5-17.7 mag (B and V mag) has been confirmed. The period 0.6707 day found by Bond (1979) was not negated, but also was not proven.

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