Variability of emission lines in the planetary nebulae IC 4997 and NGC 6572

Details Variability of emission lines in the planetary nebulae IC 4997 and NGC 6572 Variability of emission lines in the planetary nebulae IC 4997 and NGC 6572

May 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992pasp..104..339f&link_type=abstract

Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 104, no. 675, May 1992, p. 339-349.

Astronomy and Astrophysics

Astronomy

20

Emission Spectra, Line Spectra, Planetary Nebulae, Ultraviolet Astronomy, Iue, Spectrum Analysis, Stellar Mass Ejection, Temporal Distribution

Scientific paper

New IUE high-dispersion data and recent ground-based spectra of the planetary nebulae IC 4997 and NGC 6572 are compared with equivalent IUE observations taken in 1980 and optical data taken in 1974-1990. Significant changes are detected in many emission-line fluxes in IC 4997, and primarily in He II and C IV for NGC 6572. These changes are interpreted as due to recent temperature increases in the central stars of the planetaries which are known to belong to a small set which have shown variability in the past.

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