Discovery of two bright DO-type white dwarfs
| Autor: | Reindl, Nicole, Geier, Stephan, Østensen, Roy H. |
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| Rok vydání: | 2018 |
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| Druh dokumentu: | Working Paper |
| DOI: | 10.1093/mnras/sty1875 |
| Popis: | We discovered two bright DO-type white dwarfs, GALEXJ053628.3+544854 (J0536+5448) and GALEX231128.0+292935(J2311+2929), which rank among the eight brightest DO-type white dwarfs known. Our non-LTE model atmosphere analysis reveals effective temperatures and surface gravities of $T_{\mathrm{eff}}=80000\pm4600\,\mathrm{K}$ and $\log \mathrm{g}=8.25\pm0.15$ for J0536+5448 and $T_{\mathrm{eff}}=69400\pm900\,\mathrm{K}$ and $\log \mathrm{g}=7.80\pm0.06$ for J2311+2929. The latter shows a significant amount of carbon in its atmosphere ($C=0.003^{+0.005}_{-0.002}$, by mass), while for J0536+5448 we could derive only an upper limit of $C<0.003$. Furthermore, we calculated spectroscopic distances for the two stars and found a good agreement with the distances derived from the Gaia parallaxes. Comment: 7 pages, 4 figures, accepted for publication in MNRAS |
| Databáze: | arXiv |
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