Sowicka, P;
Jones, D;
Corradi, RLM;
Wesson, R;
Garcia-Rojas, J;
Santander-Garcia, M;
Boffin, HMJ;
(2017)
The planetary nebula IC 4776 and its post-common-envelope binary central star.
Monthly Notices of the Royal Astronomical Society
, 471
(3)
pp. 3529-3546.
10.1093/mnras/stx1697.
Preview |
Text
Wesson.pdf - Published Version Download (1MB) | Preview |
Abstract
We present a detailed analysis of IC 4776, a planetary nebula displaying a morphology believed to be typical of central star binarity. The nebula is shown to comprise a compact hourglass-shaped central region and a pair of precessing jet-like structures. Time-resolved spectroscopy of its central star reveals a periodic radial velocity variability consistent with a binary system. Whilst the data are insufficient to accurately determine the parameters of the binary, the most likely solutions indicate that the secondary is probably a low-mass main-sequence star. An empirical analysis of the chemical abundances in IC 4776 indicates that the common-envelope phase may have cut short the asymptotic giant branch evolution of the progenitor. Abundances calculated from recombination lines are found to be discrepant by a factor of approximately 2 relative to those calculated using collisionally excited lines, suggesting a possible correlation between low-abundance discrepancy factors and intermediate-period post-common-envelope central stars and/or Wolf-Rayet central stars. The detection of a radial velocity variability associated with the binarity of the central star of IC 4776 may be indicative of a significant population of (intermediate-period) post-common-envelope binary central stars that would be undetected by classic photometric monitoring techniques.
| Type: | Article |
|---|---|
| Title: | The planetary nebula IC 4776 and its post-common-envelope binary central star |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1093/mnras/stx1697 |
| Publisher version: | http://doi.org/10.1093/mnras/stx1697 |
| Language: | English |
| Additional information: | © 2017 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | Science & Technology, Physical Sciences, Astronomy & Astrophysics, binaries: spectroscopic, stars: mass-loss, ISM: jets and outflows, planetary nebulae: individual: (IC 4776, PN G002.0-13.4), GALACTIC BULGE, ABUNDANCE DISCREPANCY, NGC 6778, ELEMENTAL ABUNDANCES, PERIOD DISTRIBUTION, MAGNETIC-FIELDS, EVOLUTION, BIPOLAR, DISCOVERY, NUCLEUS |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy |
| URI: | https://discovery-pp.ucl.ac.uk/id/eprint/1561825 |
Archive Staff Only
 |
View Item |
