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. |
Další formáty:
BibTeX
LaTeX
RIS
@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.
|