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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
Two rings but no fellowship: Lotr 1 and its relation to planetary nebulae possessing barium central stars
Monthly Notices of the Royal Astronomical Society, Volume 436, No. 3, Year 2013
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Description
LoTr 1 is a planetary nebula thought to contain an intermediate-period binary central star system (that is, a system with an orbital period, P, between 100 and, say, 1500 d). The system shows the signature of a K type, rapidly rotating giant and most likely constitutes an accretioninduced post-mass-transfer system similar to other PNe, such as LoTr 5, WeBo 1 and A70. Such systems represent rare opportunities to further the investigation into the formation of barium stars and intermediate-period post-asymptotic giant branch systems - a formation process still far from being understood. Here, we present the first detailed analyses of both the central star system and the surrounding nebula of LoTr 1 using a combination of spectra obtained with Very Large Telescope-Focal Reducer and low dispersion Spectrograph, Anglo- Australian Telescope-UCL Coud́e Echelle Spectrograph and New Technology Telescope- European Southern Observatory Multi-Mode Instrument, as well as SuperWASP (Wide Angle Search for Planets) photometry. We confirm the binary nature of the central star of LoTr 1 that consists of a K1 III giant and a hot white dwarf. The cool giant does not present any sign of s-process enhancement but is shown to have a rotation period of 6.4 d, which is a possible sign of mass accretion. LoTr 1 also presents broad double-peaked Ha emission lines, whose origin is still unclear. The nebula of LoTr 1 consists in two slightly elongated shells, with ages of 17 000 and 35 000 yr, respectively, and with different orientations. As such, LoTr 1 present a very different nebular morphology than A70 and WeBo 1, which may be an indication of difference in the mass-transfer episodes. © 2013 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society.
Authors & Co-Authors
Tyndall, Amy A.
United Kingdom, Manchester
The University of Manchester
Jones, David
Chile, Santiago
European Southern Observatory Santiago
Boffin, Henri M.J.
Chile, Santiago
European Southern Observatory Santiago
Miszalski, Brent
South Africa, Cape Town
South African Astronomical Observatory
South Africa, Observatory
Southern African Large Telescope
Faedi, Francesca
United Kingdom, Coventry
Faculty of Science, Engineering and Medicine
Lloyd, M.
United Kingdom, Manchester
The University of Manchester
Boumis, Panayotis
Greece, Athens
National Observatory of Athens
Lopez, J. A.
Mexico, Mexico
Universidad Nacional Autónoma de México
Martell, S.
Australia
Australian Astronomical Observatory
Pollacco, Donald L.
United Kingdom, Coventry
Faculty of Science, Engineering and Medicine
Santander-García, Miguel
Spain, Torrejon de Ardoz
Centro de Astrobiología Csic-inta
Statistics
Citations: 21
Authors: 11
Affiliations: 9
Identifiers
Doi:
10.1093/mnras/stt1713
ISSN:
00358711
e-ISSN:
13652966
Research Areas
Environmental