Discovery of two bright DO-type white dwarfs
- We discovered two bright DO-type white dwarfs, GALEXJ053628.3+544854 (J0536+5448) and GALEXJ231128.0+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-eff = 80000 +/- 4600K and log g = 8.25 +/- 0.15 for J0536+5448 and T-eff = 69400 +/- 900K and log g = 7.80 +/- 0.06 for J2311+2929. The latter shows a significant amount of carbon in its atmosphere (C = 0.003(-0.002)(+0.005), 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.
| Author details: | Nicole ReindlORCiDGND, Stephan Alfred GeierORCiDGND, R. H. Ostensen |
|---|---|
| DOI: | https://doi.org/10.1093/mnras/sty1875 |
| ISSN: | 0035-8711 |
| ISSN: | 1365-2966 |
| Title of parent work (English): | Monthly notices of the Royal Astronomical Society |
| Publisher: | Oxford Univ. Press |
| Place of publishing: | Oxford |
| Publication type: | Article |
| Language: | English |
| Date of first publication: | 2018/07/11 |
| Publication year: | 2018 |
| Release date: | 2021/09/24 |
| Tag: | stars: abundances; stars: atmospheres; white dwarfs |
| Volume: | 480 |
| Issue: | 1 |
| Number of pages: | 7 |
| First page: | 1211 |
| Last Page: | 1217 |
| Funding institution: | Royal Commission for the Exhibition of 1851; Heisenberg programme of the Deutsche ForschungsgemeinschaftGerman Research Foundation (DFG) [GE 2506/8-1] |
| Organizational units: | Mathematisch-Naturwissenschaftliche Fakultät / Institut für Physik und Astronomie |
| DDC classification: | 5 Naturwissenschaften und Mathematik / 52 Astronomie / 520 Astronomie und zugeordnete Wissenschaften |
| Peer review: | Referiert |
| Publishing method: | Open Access / Green Open-Access |
