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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
Abell 48 - A rare WN-type central star of a planetary nebula
Monthly Notices of the Royal Astronomical Society, Volume 430, No. 3, Year 2013
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Description
A considerable fraction of the central stars of planetary nebulae (CSPNe) are hydrogendeficient. Almost all of these H-deficient central stars (CSs) display spectra with strong carbon and helium lines. Most of them exhibit emission-line spectra resembling those of massive WC stars. Therefore these stars are classed as CSPNe of spectral type [WC]. Recently, quantitative spectral analysis of two emission-line CSs, PB 8 and IC 4663, revealed that these stars do not belong to the [WC] class. Instead PB 8 has been classified as [WN/WC] type and IC 4663 as [WN] type. In this work we report the spectroscopic identification of another rare [WN] star, the CS of Abell 48. We performed a spectral analysis of Abell 48 with the Potsdam Wolf- Rayet (PoWR) models for expanding atmospheres. We find that the expanding atmosphere of Abell 48 is mainly composed of helium (85 per cent by mass), hydrogen (10 per cent) and nitrogen (5 per cent). The residual hydrogen and the enhanced nitrogen abundance make this object different from the other [WN] star IC 4663. We discuss the possible origin of this atmospheric composition. © The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society.
Authors & Co-Authors
Todt, Helge
Germany, Potsdam
Universität Potsdam
Kniazev, Alexei Yu
South Africa, Cape Town
South African Astronomical Observatory
South Africa, Observatory
Southern African Large Telescope Foundation
Russian Federation, Moscow
Lomonosov Moscow State University
Gvaramadze, V. V.
Russian Federation, Moscow
Lomonosov Moscow State University
Russian Federation, Moscow
Isaac Newton Institute of Chile
Hamann, Wolf Rainer
Germany, Potsdam
Universität Potsdam
Buckley, David A.H.
South Africa, Observatory
Southern African Large Telescope Foundation
Crause, Lisa A.
South Africa, Cape Town
South African Astronomical Observatory
Crawford, Steven M.
South Africa, Cape Town
South African Astronomical Observatory
South Africa, Observatory
Southern African Large Telescope Foundation
Sickafoose, A. A.
South Africa, Cape Town
South African Astronomical Observatory
South Africa, Observatory
Southern African Large Telescope Foundation
Hettlage, Christian
South Africa, Cape Town
South African Astronomical Observatory
South Africa, Observatory
Southern African Large Telescope Foundation
Hooper, Eric J.
United States, Madison
University of Wisconsin-madison
Husser, Tim Oliver
Germany, Gottingen
Georg-august-universität Göttingen
Kotzé, Paul P.A.
South Africa, Cape Town
South African Astronomical Observatory
South Africa, Observatory
Southern African Large Telescope Foundation
Loaring, Nicola S.
South Africa, Cape Town
South African Astronomical Observatory
South Africa, Observatory
Southern African Large Telescope Foundation
Nordsieck, Kenneth H.
United States, Madison
University of Wisconsin-madison
O'Donoghue, Darragh E.
South Africa, Observatory
Southern African Large Telescope Foundation
Pickering, Timothy E.
South Africa, Cape Town
South African Astronomical Observatory
South Africa, Observatory
Southern African Large Telescope Foundation
Potter, Stephen B.
South Africa, Cape Town
South African Astronomical Observatory
Romero-Colmenero, Encarnacion
South Africa, Cape Town
South African Astronomical Observatory
South Africa, Observatory
Southern African Large Telescope Foundation
Väisänen, Petri S.M.
South Africa, Cape Town
South African Astronomical Observatory
South Africa, Observatory
Southern African Large Telescope Foundation
Williams, Theodore B.
United States, New Brunswick
Rutgers University–new Brunswick
Wolf, Marsha J.
United States, Madison
University of Wisconsin-madison
Statistics
Citations: 21
Authors: 21
Affiliations: 8
Identifiers
Doi:
10.1093/mnras/stt056
ISSN:
00358711
e-ISSN:
13652966
Research Areas
Environmental
Study Approach
Quantitative