The pulsating nucleus of the planetary nebula Longmore 4

Details The pulsating nucleus of the planetary nebula Longmore 4 The pulsating nucleus of the planetary nebula Longmore 4

Sep 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990aj....100..788b&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 100, Sept. 1990, p. 788-792.

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31

Planetary Nebulae, Stellar Oscillations, Variable Stars, Charge Coupled Devices, Light Curve, Power Spectra, Stellar Evolution, Stellar Spectrophotometry

Scientific paper

CCD photometry of the planetary nebula Longmore 4 is presented to show that the central star of the nebula is a multiperiodic pulsator. Both its spectrum, which is dominated by features of He II and C IV, and its pulsation periods are very similar to those of the other known pulsating central star, K 1-16. The four known pulsating GW Vir white dwarfs are also dominated by features of He II, C IV, and O IV, indicating extremely hot (100,000 K or higher), hydrogen-deficient, and carbon- and oxygen-rich surface layers. The apparent uniformity of the chemical compositions supports a pulsation mechanism based on cyclical ionization of carbon and oxygen.

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