| REINDL, Nicole, Matthew BAINBRIDGE, N. PRZYBILLA, S. GEIER, Milan PRVÁK, Jiří KRTIČKA, R. H. OSTENSEN, J. TELTING a K. WERNER. Unravelling the baffling mystery of the ultrahot wind phenomenon in white dwarfs. Monthly Notices of the Royal Astronomical Society. Oxford: OXFORD UNIV PRESS, 2019, roč. 482, č. 1, s. "L93"-"L98", 6 s. ISSN 0035-8711. Dostupné z: https://dx.doi.org/10.1093/mnrasl/sly191. |
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@article{1599999,
author = {Reindl, Nicole and Bainbridge, Matthew and Przybilla, N. and Geier, S. and Prvák, Milan and Krtička, Jiří and Ostensen, R. H. and Telting, J. and Werner, K.},
article_location = {Oxford},
article_number = {1},
doi = {http://dx.doi.org/10.1093/mnrasl/sly191},
keywords = {stars: AGB and post-AGB; stars: evolution; stars: magnetic field},
language = {eng},
issn = {0035-8711},
journal = {Monthly Notices of the Royal Astronomical Society},
title = {Unravelling the baffling mystery of the ultrahot wind phenomenon in white dwarfs},
url = {https://ui.adsabs.harvard.edu/abs/2019MNRAS.482L..93R/abstract},
volume = {482},
year = {2019}
}
TY - JOUR
ID - 1599999
AU - Reindl, Nicole - Bainbridge, Matthew - Przybilla, N. - Geier, S. - Prvák, Milan - Krtička, Jiří - Ostensen, R. H. - Telting, J. - Werner, K.
PY - 2019
TI - Unravelling the baffling mystery of the ultrahot wind phenomenon in white dwarfs
JF - Monthly Notices of the Royal Astronomical Society
VL - 482
IS - 1
SP - "L93"-"L98"
EP - "L93"-"L98"
PB - OXFORD UNIV PRESS
SN - 00358711
KW - stars: AGB and post-AGB
KW - stars: evolution
KW - stars: magnetic field
UR - https://ui.adsabs.harvard.edu/abs/2019MNRAS.482L..93R/abstract
L2 - https://ui.adsabs.harvard.edu/abs/2019MNRAS.482L..93R/abstract
N2 - The presence of ultrahigh excitation (UHE) absorption lines (e.g. OVIII) in the optical spectra of several of the hottest white dwarfs poses a decades-long mystery and is something that has never been observed in any other astrophysical object. The occurrence of such features requires a dense environment with temperatures near 10(6) K, by far exceeding the stellar effective temperature. Here we report the discovery of a new hot wind white dwarf, GALEXJ014636.8+323615. Astonishingly, we found for the first time rapid changes of the equivalent widths of the UHE features, which are correlated to the rotational period of the star (P=0.242035 d). We explain this with the presence of a wind-fed circumstellar magnetosphere in which magnetically confined wind shocks heat up the material to the high temperatures required for the creation of the UHE lines. The photometric and spectroscopic variability of GALEXJ014636.8+323615 can then be understood as consequence of the obliquity of the magnetic axis with respect to the rotation axis of the white dwarf. This is the first time a wind-fed circumstellar magnetosphere around an apparently isolated white dwarf has been discovered and finally offers a plausible explanation of the ultrahot wind phenomenon.
ER -
REINDL, Nicole, Matthew BAINBRIDGE, N. PRZYBILLA, S. GEIER, Milan PRVÁK, Jiří KRTIČKA, R. H. OSTENSEN, J. TELTING a K. WERNER. Unravelling the baffling mystery of the ultrahot wind phenomenon in white dwarfs. \textit{Monthly Notices of the Royal Astronomical Society}. Oxford: OXFORD UNIV PRESS, 2019, roč.~482, č.~1, s.~''L93''-''L98'', 6 s. ISSN~0035-8711. Dostupné z: https://dx.doi.org/10.1093/mnrasl/sly191.
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