J/MNRAS/510/3102 PN Ou5 gri and RV curves (Jones+, 2022)
The post-common-envelope binary central star of the planetary nebula Ou 5:
a doubly-eclipsing post-red-giant-branch system.
Jones D., Munday J., Corradi R.L.M., Rodriguez-Gil P., Boffin H.M.J.,
Zak J., Sowicka P., Parsons S.G., Dhillon V.S., Littlefair S.P.,
Marsh T.R., Reindl N., Garcia-Rojas J.
<Mon. Not. R. Astron. Soc. 510, 3102 (2022)>
=2022MNRAS.510.3102J 2022MNRAS.510.3102J (SIMBAD/NED BibCode)
ADC_Keywords: Planetary nebulae ; Binaries, eclipsing ;
Binaries, spectroscopic ; Photometry, ugriz ; Radial velocities
Keywords: stars: AGB and post-AGB - white dwarfs -
planetary nebulae: individual: IPHASXJ211420.0+434136 -
binaries: eclipsing - binaries: spectroscopic
Abstract:
We present a detailed study of the stellar and orbital parameters of
the post-common envelope binary central star of the planetary nebula
Ou5. Low-resolution spectra obtained during the primary eclipse - to
our knowledge the first isolated spectra of the companion to a
post-common-envelope planetary nebula central star - were compared to
catalogue spectra, indicating that the companion star is a late K- or
early M-type dwarf. Simultaneous modelling of multi-band photometry
and time-resolved radial velocity measurements was then used to
independently determine the parameters of both stars as well as the
orbital period and inclination. The modelling indicates that the
companion star is low mass (∼0.25M☉) and has a radius
significantly larger than would be expected for its mass. Furthermore,
the effective temperature and surface gravity of nebular progenitor,
as derived by the modelling, do not lie on single-star post-AGB
evolutionary tracks, instead being more consistent with a post-RGB
evolution. However, an accurate determination of the component masses
is challenging. This is principally due to the uncertainty on the
locus of the spectral lines generated by the irradiation of the
companion's atmosphere by the hot primary (used to derive companion
star's radial velocities), as well as the lack of radial velocities of
the primary.
Description:
WHT-HiPERCAM and INT-WFC photometry of the central star of PN Ou5 in
g, r and i bands, as well as i-band photometry from the IAC80.
WHT-ISIS radial velocities of the cool component of the binary central
star of PN Ou5.
Objects:
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RA (2000) DE Designation(s) (Per)
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21 14 20.03 +43 41 36.0 IPHASX J211420.0+434136 = Name PN Ou5 (0.3642268)
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
rv.dat 34 9 Radial velocity measurements of the cool component
of the central star of PN Ou5
g-hip.dat 31 1443 WHT-HiPERCAM g-band photometry of the central star
of the central star of PN Ou5
g-wfc.dat 31 72 INT-WFC g-band photometry of the central star
of the central star of PN Ou5
i-hip.dat 31 2414 WHT-HiPERCAM i-band photometry of the central star
of the central star of PN Ou5
i-iac80.dat 31 352 IAC80 i-band photometry of the central star
of the central star of PN Ou5
i-wfc.dat 31 233 INT-WFC i-band photometry of the central star
of the central star of PN Ou5
r-hip.dat 31 2501 WHT-HiPERCAM r-band photometry of the central star
of the central star of PN Ou5
r-wfc.dat 31 75 INT-WFC r-band photometry of the central star
of the central star of PN Ou5
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Byte-by-byte Description of file: rv.dat
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Bytes Format Units Label Explanations
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3- 16 F14.6 d HJD Heliocentric Julian date
20- 26 F7.2 km/s RV Radial velocity
30- 34 F5.2 km/s e_RV Uncertainty on radial velocity measurement
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Byte-by-byte Description of file: g-*.dat i-*.dat r-*.dat
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Bytes Format Units Label Explanations
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3- 16 F14.6 d HJD Heliocentric Julian date
20- 24 F5.2 mag mag Apparent magnitude in g-band
27- 31 F5.2 mag e_mag Uncertainty on apparent magnitude
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Acknowledgements:
David Jones, djones(at)iac.es
(End) Patricia Vannier [CDS] 28-Dec-2021