J/A+A/562/A89 i light curve ans spectra of Hen2-11 central star (Jones+, 2014)
The post-common-envelope, binary central star of the planetary nebula Hen 2-11.
Jones D., Boffin H.M.J., Miszalski B., Wesson R., Corradi R.L.M.,
Tyndall A.A.
<Astron. Astrophys. 562, A89 (2014)>
=2014A&A...562A..89J 2014A&A...562A..89J
ADC_Keywords: Binaries, eclipsing ; Planetary nebulae ; Photometry, CCD ;
Spectroscopy
Keywords: binaries: close - binaries: eclipsing - circumstellar matter -
ISM: abundances - stars: AGB and post-AGB -
planetary nebulae: individual: Hen 2-11
Abstract:
We present a detailed photometric study of the central star system of
the planetary nebula Hen 2-11, selected for study because of its
low-ionisation filaments and bipolar morphology - traits which have
been strongly linked with central star binarity. Photometric
monitoring with NTT-EFOSC2 reveals a highly irradiated,
double-eclipsing, post-common-envelope system with a period of 0.609
d. Modelling of the lightcurve indicates that the nebular progenitor
is extremely hot, while the secondary in the system is probably a
K-type main sequence star. The chemical composition of the nebula is
analysed, showing Hen 2-11 to be a medium-excitation non-Type I
nebula. A simple photoionisation model is constructed determining
abundance ratios of C/O and N/O which would be consistent with the
common-envelope cutting short the AGB evolution of the nebular
progenitor.
The detection of a post-common-envelope binary system at the heart of
Hen 2-11 further strengthens the link between binary progeny and the
formation of axisymmetric planetary nebulae with patterns of
low-ionisation filaments, clearly demonstrating their use as
morphological indicators of central star binarity.
Description:
i-band photometry of the central star of Hen2-11 and extracted 1D
spectra and reduced 2D spectra.
Objects:
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RA (2000) DE Designation(s)
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08 37 07.98 -39 25 05.4 Hen 2-11 = PN G259.1+00.9
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
phot.dat 32 200 i-band photometry of Hen 2-11 central star
list.dat 78 3 List of FITS spectra
sp/* . 3 Individual 1D FITS spectra
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Byte-by-byte Description of file: phot.dat
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Bytes Format Units Label Explanations
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1- 15 F15.7 d JD Julian Date
18- 24 F7.4 mag imag Gunn i-band apparent magnitude
27- 32 F6.4 mag e_imag Uncertainty of Gunn i-band magnitude
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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- 7 F7.2 0.1nm lambda1 [3900/6300] Lower value of wavelength interval
8 A1 --- --- [/]
9- 15 F7.2 0.1nm lambda2 [6180/9300] Upper value of wavelength interval
17- 21 F5.3 0.1nm dlambda [0.66/0.98] Wavelength step (resolution)
23- 32 A10 "Y-M-D" ObsDate Date of observation
34- 37 I4 --- Nx [3170] Number of wavelengths
38 A1 --- --- [x]
39 I1 --- Nsp [1/2] Number of files (2nd is background)
41- 50 A10 --- FileName Name of FITS file in subdirectory sp
52- 78 A27 --- Title Title fo the spectrum
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Acknowledgements:
David Jones, djones(at)eso.org
(End) David Jones [ESO, Chile], Patricia Vannier [CDS] 08-Jan-2014