1997A&AS..126..385P -
Astron. Astrophys., Suppl. Ser., 126, 385-391 (1997/December-2)
Wind variability in central stars of planetary nebulae. II.
PATRIARCHI P. and PERINOTTO M.
Abstract (from CDS):
New high resolution IUE spectra of central stars of the planetary nebulae (CSPN) NGC 40, NGC 6543, NGC 6826, and BD +30 3639 have been obtained between August 1994 and September 1995 to explore the variability of their P Cygni profiles. The data have been analyzed together with previous observations of the same stars. Significant changes in the profiles of several of the typical wind lines of the N V, O IV, O V, Si IV, C IV, and N IV ions have been revealed in all the observed stars. By combining these results with the ones obtained in a previous paper of this series (Patriarchi & Perinotto
1995A&AS..110..353P; Paper I), it is found that half of the fourteen observed CSPN exhibit changes in the shape of their P Cygni profiles up to levels of 10-50% in timescales of years, analogous to similar timescale variations exhibited by hot stars of population I. They are: NGC 40, NGC 1535, NGC 2392, NGC 6543, NGC 6826, IC 4593 and BD +30 3639. The ones for which changes have not been detected are: NGC 246, NGC 6210, NGC 6572, NGC 7009, IC 418, IC 2149 and Lo 8. The present paper completes the survey of this type (at least 2-3 well separated high resolution good exposures for each star) that could have been done in central stars of planetary nebulae using the IUE satellite. In a typical case (NGC 1535) we estimate that the changes in the physical properties of the wind, resulting from the observed changes in the P Cygni profiles, amount for {dot}(M)q
NV to a factor of 3±1.
Abstract Copyright:
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Journal keyword(s):
planetary nebulae: general - stars: mass loss
Simbad objects:
4
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