Zobrazeno 1 - 10
of 29
pro vyhledávání: '"Nowotny, P."'
Autor:
Mečina, M., Aringer, B., Nowotny, W., Groenewegen, M. A. T., Kerschbaum, F., Brunner, M., Gail, H. -P.
Publikováno v:
A&A 644, A66 (2020)
Stars on the asymptotic giant branch (AGB) lose considerable amounts of matter through their dust-driven stellar winds. A number of such sources have been imaged by Herschel/PACS, revealing a diverse sample of different morphological types. Among the
Externí odkaz:
http://arxiv.org/abs/2010.14963
We have computed a grid of hydrostatic spherical COMARCS models for C stars covering metallicities from [Z/H]=0 to -2 and values of the carbon excess [C-O] from 6.41 to 9.15, plus some temperature sequences, where the amount of oxygen and nitrogen is
Externí odkaz:
http://arxiv.org/abs/1905.09106
Publikováno v:
A&A 606, A6 (2017)
Wind-driving in asymptotic giant branch (AGB) stars is commonly attributed to a two-step process. First, matter in the stellar atmosphere is levitated by shock waves, induced by stellar pulsation, and second, this matter is accelerated by radiation p
Externí odkaz:
http://arxiv.org/abs/1706.08332
Autor:
Wittkowski, M., Hofmann, K. -H., Höfner, S., Bouquin, J. B. Le, Nowotny, W., Paladini, C., Young, J., Berger, J. -P., Brunner, M., de Gregorio-Monsalvo, I., Eriksson, K., Hron, J., Humphreys, E. M. L., Lindqvist, M., Maercker, M., Mohamed, S., Olofsson, H., Ramstedt, S., Weigelt, G.
Publikováno v:
A&A 601, A3 (2017)
We present near-infrared interferometry of the carbon-rich asymptotic giant branch (AGB) star R Sculptoris. The visibility data indicate a broadly circular resolved stellar disk with a complex substructure. The observed AMBER squared visibility value
Externí odkaz:
http://arxiv.org/abs/1702.02574
Autor:
Gonneau, A., Lançon, A., Trager, S. C., Aringer, B., Nowotny, W., Peletier, R. F., Prugniel, P., Chen, Y. -P., Lyubenova, M.
Publikováno v:
A&A 601, A141 (2017)
In a previous paper, we assembled a collection of medium-resolution spectra of 35 carbon stars, covering optical and near-infrared wavelengths from 400 to 2400 nm. The sample includes stars from the Milky Way and the Magellanic Clouds, with a variety
Externí odkaz:
http://arxiv.org/abs/1702.00819
Autor:
Rau, Gioia, Hron, Josef, Paladini, Claudia, Aringer, Benard, Eriksson, Kjell, Marigo, Paola, Nowotny, Walter, Grellmann, Rebekka
Publikováno v:
A&A 600, A92 (2017)
Modeling stellar atmospheres is a complex, intriguing task in modern astronomy. A systematic comparison of models with multi-technique observations is the only efficient way to constrain them. Aims: We performed a self-consistent modeling of the atmo
Externí odkaz:
http://arxiv.org/abs/1701.04331
Publikováno v:
A&A 589, A130 (2016)
Winds of AGB stars are thought to be driven by a combination of pulsation-induced shock waves and radiation pressure on dust. In dynamic atmosphere and wind models, the stellar pulsation is often simulated by prescribing a simple sinusoidal variation
Externí odkaz:
http://arxiv.org/abs/1603.06735
Autor:
Gonneau, A., Lançon, A., Trager, S. C., Aringer, B., Lyubenova, M., Nowotny, W., Peletier, R. F., Prugniel, P., Chen, Y. -P., Dries, M., Choudhury, O. S., Falcón-Barroso, J., Koleva, M., Meneses-Goytia, S., Sánchez-Blázquez, P., Vazdekis, A.
Publikováno v:
A&A 589, A36 (2016)
We provide a new collection of spectra of 35 carbon stars obtained with the ESO/VLT X-shooter instrument as part of the X-shooter Spectral Library project. The spectra extend from 0.3$\mu$m to 2.4$\mu$m with a resolving power above $\sim$ 8000. The s
Externí odkaz:
http://arxiv.org/abs/1602.00887
Based on a grid of hydrostatic spherical COMARCS models for cool stars we have calculated observable properties of these objects, which will be mainly used in combination with stellar evolution tracks and population synthesis tools. The high resoluti
Externí odkaz:
http://arxiv.org/abs/1601.07025
Publikováno v:
A&A 583, A106 (2015)
Context. We study the atmosphere of the carbon-rich Mira RU Vir using the mid-infrared high spatial resolution interferometric observations from VLTI/MIDI. Aims. The aim of this work is to analyse the atmosphere of the carbon-rich Mira RU Vir, with s
Externí odkaz:
http://arxiv.org/abs/1506.03978