Understanding the photometric variability of {\zeta} Ori Aa
| Autor: | Buysschaert, B., Neiner, C., Ramiaramanantsoa, T., Richardson, N. D., David-Uraz, A., Moffat, A. F. J. |
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| Rok vydání: | 2016 |
| Předmět: | |
| Druh dokumentu: | Working Paper |
| Popis: | We studied the variability of the magnetic O-type supergiant $\zeta$ Ori Aa using multi-colour BRITE photometry. We confirmed the known rotation frequency $f_{\rm rot} = 0.15 \pm 0.02$ c/d, and detected some of its higher harmonics, of which $4f_{\rm rot}$ is compatible with the known DAC recurrence timescale. Thanks to simultaneous high-resolution CHIRON spectroscopy, we could identify another frequency $f_{\rm env} = 0.10 \pm 0.02$ c/d, caused by the circumstellar environment. Variations in the circumstellar environment are believed to cause the observed difference between the BRITE lightcurves. Comment: 7 pages, 3 figures, proceedings for the Second BRITE-Constellation Science Conference |
| Databáze: | arXiv |
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