Discovery of an O vi -emitting Nebula around the Hot White Dwarf KPD 0005+5106
| Autor: | W. Van Dyke Dixon, Birgit Otte, Ravi Sankrit |
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| Rok vydání: | 2004 |
| Předmět: |
Physics
Nebula Astrophysics::High Energy Astrophysical Phenomena Far ultraviolet Astrophysics (astro-ph) FOS: Physical sciences White dwarf Astronomy and Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics Astrophysics Photoionization medicine.disease_cause Planetary nebula Space and Planetary Science medicine Astrophysics::Solar and Stellar Astrophysics Astrophysics::Earth and Planetary Astrophysics Surface brightness Astrophysics::Galaxy Astrophysics Ultraviolet |
| Zdroj: | The Astrophysical Journal. 606:L143-L146 |
| ISSN: | 1538-4357 0004-637X |
| Popis: | A survey of diffuse interstellar sight lines observed with the Far Ultraviolet Spectroscopic Explorer has led to the serendipitous discovery of a high-ionization nebula around the hot white dwarf KPD 0005+5106. The nebula has an OVI 1032A surface brightness of up to 25,000 photons/s/cm^2/sr, making it the brightest region of extended OVI emission in our survey. Photoionization models using the incident white dwarf continuum successfully reproduce the observed OVI intensity. The OVI emission arises in the highly ionized inner region of a planetary nebula around KPD 0005+5106. This newly discovered nebula may be one member of a class of high-ionization planetary nebulae that are difficult to detect in the optical, but which can be easily identified in the ultraviolet. accepted for publication in ApJL, 11 pages including 2 figures |
| Databáze: | OpenAIRE |
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