Zobrazeno 1 - 10
of 136
pro vyhledávání: '"Schoenberner, D."'
Autor:
Schönberner, D., Steffen, M.
We seek to understand the evolution of Wolf-Rayet central stars by comparing the diffuse X-ray emission from their wind-blown bubbles with that from their hydrogen-rich counterparts with predictions from hydrodynamical models. We simulate the dynamic
Externí odkaz:
http://arxiv.org/abs/2401.16309
Autor:
Schönberner, D., Steffen, M.
Publikováno v:
A&A 625, A137 (2019)
Individual distances to planetary nebulae are of the utmost relevance for our understanding of post-asymptotic giant-branch evolution because they allow a precise determination of stellar and nebular properties. Also, objects with individual distance
Externí odkaz:
http://arxiv.org/abs/1904.10721
Akademický článek
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Autor:
Toalá, J. A., Guerrero, M. A., Todt, H., Hamann, W. -R., Chu, Y. -H., Gruendl, R. A., Schönberner, D., Oskinova, L. M., Marquez-Lugo, R. A., Fang, X., Ramos-Larios, G.
We present the XMM-Newton discovery of X-ray emission from the planetary nebula (PN) A78, the second born-again PN detected in X-rays apart from A30. These two PNe share similar spectral and morphological characteristics: They harbor diffuse soft X-r
Externí odkaz:
http://arxiv.org/abs/1411.3837
Publikováno v:
A&A 570, A88 (2014)
It is not yet clear whether magnetic fields play an essential role in shaping planetary nebulae (PNe), or whether stellar rotation alone and/or a close binary companion can account for the variety of the observed nebular morphologies. In a quest for
Externí odkaz:
http://arxiv.org/abs/1408.3000
Autor:
Freeman, M., Montez Jr., R., Kastner, J. H., Balick, B., Frew, D. J., Jones, D., Miszalski, B., Sahai, R., Blackman, E., Chu, Y. -H., De Marco, O., Frank, A., Guerrero, M. A., Lopez, J. A., Zijlstra, A., Bujarrabal, V., Corradi, R. L. M., Nordhaus, J., Parker, Q. A., Sandin, C., Schönberner, D., Soker, N., Sokoloski, J. L., Steffen, M., Toalá, J. A., Ueta, T., Villaver, E.
We present results from the most recent set of observations obtained as part of the Chandra X-ray observatory Planetary Nebula Survey (ChanPlaNS), the first comprehensive X-ray survey of planetary nebulae (PNe) in the solar neighborhood (i.e., within
Externí odkaz:
http://arxiv.org/abs/1407.4141
Autor:
Schoenberner, D., Jacob, R., Lehmann, H., Hildebrandt, G., Steffen, M., Zwanzig, A., Sandin, C., Corradi, R. L. M.
We present the result of a study on the expansion properties and internal kinematics of round/elliptical planetary nebulae of the Milky Way disk, the halo, and of the globular cluster M15. The purpose of this study is to considerably enlarge the smal
Externí odkaz:
http://arxiv.org/abs/1404.0391
The visibility time of planetary nebulae (PNe) in stellar systems is an essential quantity for estimating the size of a PN population in the context of general population studies. For instance, it enters directly into the PN death rate determination.
Externí odkaz:
http://arxiv.org/abs/1307.6189
Autor:
Kastner, J. H., Montez Jr, R., Balick, B., Frew, D. J., Miszalski, B., Sahai, R., Blackman, E., Chu, Y. -H., De Marco, O., Frank, A., Guerrero, M. A., Lopez, J. A., Rapson, V., Zijlstra, A., Behar, E., Bujarrabal, V., Corradi, R. L. M., Nordhaus, J., Parker, Q., Sandin, C., Schönberner, D., Soker, N., Sokoloski, J. L., Steffen, M., Ueta, T., Villaver, E.
We present an overview of the initial results from the Chandra Planetary Nebula Survey (ChanPlaNS), the first systematic (volume-limited) Chandra X-ray Observatory survey of planetary nebulae (PNe) in the solar neighborhood. The first phase of ChanPl
Externí odkaz:
http://arxiv.org/abs/1204.6055
Autor:
Guerrero, M. A., Ruiz, N., Hamann, W. -R., Chu, Y. -H., Todt, H., Schoenberner, D., Oskinova, L., Gruendl, R. A., Steffen, M., Blair, W. P., Toalá, J. A.
The planetary nebula (PN) A30 is believed to have undergone a very late thermal pulse resulting in the ejection of knots of hydrogen-poor material. Using HST images we have detected the angular expansion of these knots and derived an age of 850+280-1
Externí odkaz:
http://arxiv.org/abs/1202.4463