RE1016 - 05: a white dwarf binary discovered with the ROSAT Wide Field Camera
| Autor: | Tim Naylor, M. G. Watson, Keith O. Mason, G. E. Bromage, B. J. M. Hassall, S. T. Hodgkin, Graziella Branduardi-Raymont, C. M. Jomaron |
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| Rok vydání: | 1993 |
| Předmět: |
Physics
Astrophysics::High Energy Astrophysical Phenomena White dwarf Astronomy Balmer series Flux Astronomy and Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics Astrophysics Spectral line Abundance of the chemical elements symbols.namesake Space and Planetary Science ROSAT symbols Astrophysics::Solar and Stellar Astrophysics Astrophysics::Earth and Planetary Astrophysics Spectroscopy Astrophysics::Galaxy Astrophysics Line (formation) |
| Zdroj: | Monthly Notices of the Royal Astronomical Society. 264:219-227 |
| ISSN: | 1365-2966 0035-8711 |
| DOI: | 10.1093/mnras/264.1.219 |
| Popis: | We present new data on the extreme-ultraviolet source RE1016−05, discovered in the ROSAT Wide Field Camera All-Sky Survey. Spectroscopy of possible optical counterparts reveals an object with a composite DA white dwarf and M dwarf spectrum, only 19 arcsec distant from the Wide Field Camera (WFC) source coordinates. The spectra exhibit hydrogen Balmer line emission in the cores of wide Balmer absorption lines arising from the white dwarf, together with weaker He I line emission. There is evidence for variability in the optical emission-line flux on time-scales of hours, but no variation in EUV output is detected. We classify the cool companion in the range dM1-dM3, and determine the white dwarf temperature to be in the range 37 000-47 000 K |
| Databáze: | OpenAIRE |
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