Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aipc.1273...85k&link_type=abstract
17TH EUROPEAN WHITE DWARF WORKSHOP. AIP Conference Proceedings, Volume 1273, pp. 85-90 (2010).
Astronomy and Astrophysics
Astronomy
White Dwarfs, Magnetic Field Effects, Polarimetry, Astrometry, Faint Blue Stars, White Dwarfs, Degenerate Stars, Nuclei Of Planetary Nebulae, Magnetic And Electric Fields, Polarization Of Starlight, Photometric, Polarimetric, And Spectroscopic Instrumentation, Distances, Parallaxes
Scientific paper
RE J 0317-853 is an isolated magnetic white dwarf which is hot, highly magnetized and rapidly rotating compared to the rest of the magnetic white dwarf population. Due to an alleged age discrepancy estimated by its hot nature and his colder binary counterpart LB 9802, RE J 0317-853 was assumed to be a result of a binary merger. In this work we present the parallax measurements made with the Hubble Space Telescope's Fine Guidance System and the spectro-polarimetry from Anglo-Australian Observatory in order to reassess the evolutionary history of the binary system. Through the parallax measurement we determine the radius, mass and, furthermore, with the use of evolutionary models from the literature we estimate the cooling age. Additionally, we modelled the phase resolved flux and polarisation spectra of RE J 0317-853 and for the first time our magnetic models are able to account for the formerly unexplained feature with 16% of circular polarisation. We also discuss the effect of different possible core compositions and the effect of the uncertainty of the effective temperature; the value of the latter is extremely important for a correct interpretation of the evolutionary history of RE J 0317-853. A single star origin is possible if we assume that the effective temperature is at the cooler end of the possible range from 30000 K to 50000 K; if Teff is rather at the hotter end, a binary merger scenario for RE J 0317-853 becomes more plausible.
Altmann Martin
Bastian Ulrich
Burleigh Matt
Euchner Fabian
Jordan Stefan
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