| People | Locations | Statistics |
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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Lisse, C. M.
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (7/7 displayed)
- 2011Spitzer Observations of Eta Corvi : Evidence at ~1 Gyr for an LHB-Like Delivery of Organics & Water-Rich Material to the THZ of a Sun-Like Star.
- 2011Spitzer Observations of Eta Corvi : Evidence at ~1 Gyr for an LHB-Like Delivery of Organics & Water-Rich Material to the THZ of a Sun-Like Star.
- 2011Spitzer Observations of Eta Corvi : Evidence at ~1 Gyr for an LHB-Like Delivery of Organics & Water-Rich Material to the THZ of a Sun-Like Star
- 2011Spitzer Observations of Eta Corvi : Evidence at ~1 Gyr for an LHB-Like Delivery of Organics & Water-Rich Material to the THZ of a Sun-Like Star
- 2007On the Nature of the Dust in the Debris Disk around HD 69830citations
- 2006Spitzer Spectral Observations of the Deep Impact Ejectacitations
- 2000Constraints on models of Cometary x-ray emission with EUV and soft X-ray spectrophotometry
Places of action
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article
Constraints on models of Cometary x-ray emission with EUV and soft X-ray spectrophotometry
Abstract
We report on our Extreme Ultraviolet Explorer (EUVE) and ROSAT HRI photometric studies of close approaching comets, in particular Comets 2P/Encke and 55P/Tempel-Tuttle. EUVE observations of Comet 2P/Encke were obtained in July 1997 with the scanning telescopes and ROSAT HRI. Similar observations were obtained for Comet 55P/Tempel-Tuttle in January 1998. Extended, variable emission on the sunward side of the nucleus was found for both comets in the ROSAT HRI at 0.090 - 0.75 keV and in the EUVE scanner telescopes' Lexan B 0.090 - 0.28 keV and Al/Ti/C 0.050 - 0.16 keV bandpasses; useful upper limits were found in the Dagwood 0.020 - 0.040 eV bandpass. Similar to results obtained for other ROSAT detected comets, the emission morphology was roughly symmetric with respect to a vector from the comet's nucleus towards the Sun. The light curves from both comets showed a slowly varying baseline emission and large impulsive events. From the observed HRI count rates, we derive luminosities of 4x10<SUP>14</SUP> erg sec<SUP>-1</SUP> and 2x10<SUP>15</SUP> erg sec<SUP>-1</SUP> for Encke and Tempel-Tuttle, respectively. Using the results of our EUVE and HRI broad band spectrophotometry, we have found that the Haeberli et al. (1997) charge transfer, plasma-dust, and attogram dust models of cometary x-ray emission are inconsistent with the data, while the Wegmann et al. (1998) charge exchange, 0.15-0.45 keV thermal bremsstrahlung, and photon index 1.6 - 2.0 power law models are most consistent with our observations.