J/A+A/573/A65 Spectra of young planetary nebulae (Hajduk+, 2015)
Evolution of the central stars of young planetary nebulae.
Hajduk M., van Hoof P.A.M., Zijlstra A.A.
<Astron. Astrophys. 573, A65 (2015)>
=2015A&A...573A..65H 2015A&A...573A..65H
ADC_Keywords: Planetary nebulae ; Spectroscopy
Keywords: stars: AGB and post-AGB - stars: evolution -
planetary nebulae: general
Abstract:
The evolution of central stars of planetary nebulae was so far
documented in just a few cases. However, spectra collected a few
decades ago may provide a good reference for studying the evolution of
central stars using the emission line fluxes of their nebulae. We
investigated evolutionary changes of the [OIII] 5007Å line flux in
the spectra of planetary nebulae. We compared nebular fluxes collected
during a decade or longer. We used literature data and newly obtained
spectra. A grid of Cloudy models was computed using existing
evolutionary models, and the models were compared with the
observations. An increase of the [OIII] 5007Å line flux is
frequently observed in young planetary nebulae hosting H-rich central
stars. The increasing nebular excitation is the response to the
increasing temperature and hardening radiation of the central stars.
We did not observe any changes in the nebular fluxes in the planetary
nebulae hosting late-type Wolf-Rayet (WR) central stars. This may
indicate a slower temperature evolution (which may stem from a
different evolutionary status) of late-[WR] stars. In young planetary
nebulae with H-rich central stars, the evolution can be followed using
optical spectra collected during a decade or longer. The observed
evolution of H-rich central stars is consistent with the predictions
of the evolutionary models provided in the literature. Late-[WR] stars
possibly follow a different evolutionary path.
Description:
Optical spectra of planetary nebulae.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 72 21 Information on each object
table4.dat 40 48698 Spectra of planetary nebulae: flux data
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 10 A10 --- Name Name of the object
12- 21 A10 --- Date Ibservtion date
23- 25 I3 nm Lmin Wavelength start
27- 29 I3 nm Lmax Wavelength end
31- 33 F3.1 nm Res [0.4/1.3] Resolution
35- 43 A9 --- Tel Telescope (Torun, Radcliffe or SALT)
45 I1 --- No Number of exposures
47- 50 I4 s Texp Exposure time
52 I1 arcsec Slit [1/4] Slit width
54- 57 F4.2 --- secz [1/1.7] Airmass
59- 72 A14 --- Std Standard stars
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 10 A10 --- Name Name of the object
12- 26 F15.11 nm lambda [318/797] Spectral wavelength
28- 40 E13.7 cW/m2/nm F(lambda) Flux value in mW/m2/Å
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Acknowledgements:
Marcin Hajduk, cinek(at)ncac.torun.pl
(End) Patricia Vannier [CDS] 26-Nov-2014