J/A+A/642/A71 Spectra of 14 Magellanic Cloud planetary nebulae (Hajduk, 2020)
Rapid evolution of [WC] stars in the Magellanic Clouds.
Hajduk M.
<Astron. Astrophys. 642, A71 (2020)>
=2020A&A...642A..71H 2020A&A...642A..71H (SIMBAD/NED BibCode)
ADC_Keywords: Magellanic Clouds ; Planetary nebulae ; Stars, white dwarf ;
Models, evolutionary ; Spectroscopy
Keywords: stars: AGB and post-AGB - planetary nebulae: general -
stars: evolution - Magellanic Clouds
Abstract:
We obtained new spectra of fourteen Magellanic Cloud planetary nebulae
with the South African Large Telescope to determine heating rates of
their central stars and to verify evolutionary models of post
asymptotic giant branch stars. We compared new spectra with
observations made in previous years. Five planetary nebulae showed an
increase of the excitation with time. Four of their central stars
exhibit [WC] features in their spectra, including three new
detections. This raises the total number of [WC] central stars of PNe
in the Magellanic Clouds to ten. We compared determined heating rates
of the four [WC] central stars with the He burning post asymptotic
giant branch evolutionary tracks and the remaining star with the
H-burning tracks. Determined heating rates are consistent with the
evolutionary models for both H and He-burning post asymptotic giant
branch stars. The central stars of the PNe which show the fastest
increase of excitation are also the most luminous in the sample. This
indicates that [WC] central stars in the Magellanic Clouds evolve
faster than H-burning central stars and originate from more massive
progenitors.
Description:
New spectra of fourteen planetary nebulae in Magellanic Clouds are
presented.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
list.dat 119 14 List of fits spectra
fits/* . 14 Individual fits spectra
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Byte-by-byte Description of file: list.dat
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Bytes Format Units Label Explanations
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1- 13 A13 --- Name Name
15- 16 I2 h RAh Simbad Right ascension (J2000)
18- 19 I2 min RAm Simbad Right ascension (J2000)
21- 25 F5.2 s RAs Simbad Right ascension (J2000)
27 A1 --- DE- Declination sign (J2000)
28- 29 I2 deg DEd Declination (J2000)
31- 32 I2 arcmin DEm Declination (J2000)
34- 37 F4.1 arcsec DEs Declination (J2000)
39- 42 I4 --- Nx Number of pixels along X-axis
44 I1 --- Ny Number of spectra
46- 55 A10 "date" Obs.date Observation date
57- 63 F7.2 0.1nm blambda Lower value of wavelength interval
65- 71 F7.2 0.1nm Blambda Upper value of wavelength interval
73- 80 F8.6 0.1nm dlambda Wavelength resolution
82- 84 I3 Kibyte size Size of FITS file
86- 97 A12 --- FileName Name of FITS file, in subdirectory fits
99-119 A21 --- Title Title of the FITS file
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Acknowledgements:
Marcin Hajduk, marcin.hajduk(at)uwm.edu.pl
(End) Patricia Vannier [CDS] 08-Jul-2020