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39 results on '"Molster, F.J."'

2. Interplanetary Dust Particles and Astrobiology

Author

Molster, F.J., Appenzeller, I., Bahcall, J. N., Bertola, F., Cassinelli, J. P., Cesarsky, C. J., Engvold, O., McCray, R., Murdin, P. G., Pacini, F., Radhakrishnan, V., Sato, K., Shu, F. H., Somov, B. V., Sunyaev, R. A., Tanaka, Y., Tremaine, S., Weiss, N. O., Burton, W.B., editor, Kuijpers, J. M. E., editor, van den Heuvel, E. P. J., editor, van Der Laan, H., editor, Ehrenfreund, Pascale, editor, Irvine, William, editor, Owen, Toby, editor, Becker, Luann, editor, Blank, Jen, editor, Brucato, John, editor, Colangeli, Luigi, editor, Derenne, Sylvie, editor, Dutrey, Anne, editor, Despois, Didier, editor, Lazcano, Antonio, editor, and Robert, Francois, editor

Published
2005
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5. ISO's View on AFGL 4106

Author

Molster, F.J., Waters, L.B.F.M., Van Loon, J. Th., De Jong, T., Bouwman, J., Yamamura, I., Trams, N., Van Winckel, H., Waelkens, C., and Henning, T.

Published
1997
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7. An oxygen-rch dust disk surrounding an evolved star in the Red Rectangle

Author

Waters, L.B.F.M., Waelkens C., van Winckel, H., Molster, F.J., Tielens, A.G.G.M., van Loon, J., Morris, P.W., Cami,J., Bouwman, J., de Koter,A., de Jong, T., and de Graauw, Th.

Subjects
Nebulae -- Research, Environmental issues, Science and technology, Zoology and wildlife conservation
Abstract

The Red Rectangle is a prototype of carbon-rich reflection nebulae around low-mass stars in the final phases of evolution. Infrared observations of of the Red Rectangle reveal that oxygen-rich material is present in the circumbinary disk. The oxygen rich dust has properties similar to those of dusty disks around young stars.

Published
1998

8. European Space Agency experiments on thermodiffusion of fluid mixtures in space

Author

Braibanti, M., Artola, P.A., Baaske, P., Bataller, H., Bazile, J.P., Bou-Ali, M., Cannell, D.S., Carpineti, M., Cerbino, R., Croccolo, F., Diaz, J., Donev, A., Errarte, A., Ezquerro Navarro, José Miguel, Frutos-Pastor, A., Galand, Q., Galliero, G., Gaponenko, Y., Garcia-Fernandez, L., Gavalda, J., Giavazzi, F., Giglio, M., Giraudet, C., Hoang, H., Kufner, E., Köehler, W., Lapeira, E., Laverón Simavilla, Ana, Legros, J.C., Lizarraga, I., Lyubimova, T., Mazzoni, S., Melville, N., Mialdun, A., Minster, O., Montel, F., Molster, F.J., Ortiz de Zarate, J.M., Rodríguez, Javier, Rousseau, B., Ruiz, X., Ryzhkov, I. I., Schraml, M., Shevtsova, V., Takacs, C. J., Triller, T., Van Vaerenbergh, S., Vailati, A., Verga, A., Vermorel, R., Vesovic, V., Yasnou, V., Xu, S., Zapf, D., Zhang, K., Braibanti, M., Artola, P.A., Baaske, P., Bataller, H., Bazile, J.P., Bou-Ali, M., Cannell, D.S., Carpineti, M., Cerbino, R., Croccolo, F., Diaz, J., Donev, A., Errarte, A., Ezquerro Navarro, José Miguel, Frutos-Pastor, A., Galand, Q., Galliero, G., Gaponenko, Y., Garcia-Fernandez, L., Gavalda, J., Giavazzi, F., Giglio, M., Giraudet, C., Hoang, H., Kufner, E., Köehler, W., Lapeira, E., Laverón Simavilla, Ana, Legros, J.C., Lizarraga, I., Lyubimova, T., Mazzoni, S., Melville, N., Mialdun, A., Minster, O., Montel, F., Molster, F.J., Ortiz de Zarate, J.M., Rodríguez, Javier, Rousseau, B., Ruiz, X., Ryzhkov, I. I., Schraml, M., Shevtsova, V., Takacs, C. J., Triller, T., Van Vaerenbergh, S., Vailati, A., Verga, A., Vermorel, R., Vesovic, V., Yasnou, V., Xu, S., Zapf, D., and Zhang, K.

Abstract

This paper describes the European Space Agency (ESA) experiments devoted to study thermodiffusion of fluid mixtures in microgravity environment, where sedimentation and convection do not affect the mass flow induced by the Soret effect. First, the experiments performed on binary mixtures in the IVIDIL and GRADFLEX experiments are described. Then, further experiments on ternary mixtures and complex fluids performed in DCMIX and planned to be performed in the context of the NEUF-DIX project are presented. Finally, multi-component mixtures studied in the SCCO project are detailed.

Published
2019

9. Low-temperature crystallization of silicate dust in circumstellar disks

Author

Molster, F.J., Yamamura, I., Waters, L.B.F.M., Tielens, A.G.G.M., de Graauw, Th., de Jong, T., de Koter, A., Malfait, K., vand den Ancker, M.e., van Winckel, H., Voors, R.H.M., and Waelkens, C.

Subjects
Circumstellar matter -- Research, Environmental issues, Science and technology, Zoology and wildlife conservation
Abstract

Observations of highly crystalline silicate dust in the disks around binary red-giant stars are reported. The temperatures in the disks are too low for the grains to anneal and some low-temperature process must therefore be responsible. The results indicated that low-temperature crystallization of silicate grains can occur in protoplanetary systems.

Published
1999

12. The Science Case for 4GLS

Author

Allan, R.J., Allen, M.P., Alexandrov, A.S., Ashfold, M.N.R., Atkinson, R., Avaldi, L., Bain, C.D., Bancroft, J., Barrett, S.D., Barron, L.D., Bayliss, S., Becker, U., Benning, L.G., Berrah, N., Binns, C., Bisby, R.H., Bizau, J.M., Blake, R.J., Bowler, M.A., Bowyer, J., Brettle, J., Briggs, D., Brown, L.M., Brown, W.A., Burke, P.G., Cacho, C., Carter, R., Catlow, R., Cernik, R.J., Chesters, M., Clark, S.A., Clarke, D.T., Clarke, J.A., Codling, K., Cogdell, R., Connaughton, D., Connerade, J.P., Costello, J.T., Crapper, M.D., Creaser, C., Currell, F.J., Davies, P.B., de Jong, M., Dessent, C., Dhanak, V.R., Dobson, D.M., Dobson, P.J., Doig, A.J., Donovan, R.J., Dumas, P., Dunn, K., Dutuit, O., Dyke, J.M., Eastham, D.A., Egdell, R.G., Eland, J.H.D., Emerson, D.R., Eriksson, M., Erman, P., Evans, A., Evans, H., Evans, S., Field, T., Fielding, H., Fisher, A., Flavell, W.R., Ford, R., Frasinski, L.J., Freeman, N., Galayda, J.N., Gardner, P., Garside, J., Gay, N.J., Gejo, T., George, M., Gray, M.D., Greenshaw, T.J., Greig, D., Halsall, M.P., Hamilton, B., Harrison, N.M., Hasnain, S.S., Hatherly, P.A., Heathcote, P., Helliwell, J.R., Henderson, C.M.B, Hepburn, J., Hill, J., Hirst, G., Hirst, J.D., Holland, D.M.P., Horn, A.B., Horton, P., Hunt, M.R.C., Hutchinson, H., Inglesfield, J.E., Ivanov, V.K., Johnson, C.A.F., Johnson, L.N., Jones, D., Jones, F.H., Jones, G.R., Jones, L., Kadodwala, M., Karlsson, L., Kennedy, E.T., King, G.C., King, M.R.F., Kirkman, I.W., Kleese, K., Knight, P.L., Kylstra, N., Larkins, F.P., Latimer, C., Lawley, K.P., Leggett, G.J., Lewis, R.A., Lindsey, K., Lu, J.R., Lyng, F.M., Macdonald, M.A., Malins, A., Marangos, J.P., Margaritondo, G., Marsi, M., Marston, G., Martin, S.R., Martin-Fernandez, M.L., Mason, N.J., Matthew, J.A.D., McCoustra, M.R.S., McGilp, J., McGovern, I.T., McGrath, R., Meldrum, R.A., Meyer, M., Millar, T.J., Mitchell, D., Møller, S.P., Molster, F.J., Moriarty, P., Morin, P., Munro, I.H., Murdin, B.N., Nahon, L., Newell, W.R., Noble, C.J., Nordgren, E.J., Norman, P.R., O'Brien, P., O'Neill, P., O'Shea, P., Owen, H., Pain, R., Papiz, M., Parker, A., Parker, J., Parr, A., Pattrick, R., Pemble, M.E., Picardo, M., Pidgeon, C.R., Pinheiro, T.J.T., Poliakoff, E.D., Poole, M.W., Potts, A., Potvliege, R., Powis, I., Price, S.D., Quinn, F.M., Radford, S., Rachlew-Källne, E., Raval, R., Read, F.H., Reddish, T.J., Ridley, P.A., Roberts, G., Russell, A.E., Ryan, A.J., Sapelkin, A., Sato, S., Schneider, A., Seddon, E.A., Shaw, E.A., Shen, T., Sherwood, P., Šiller, L., Smith, A.D., Smith, D.A., Smith, I., Smith, S.L., Snowdon, K., Softley, T.P., Sokell, E., Southworth, S.H., Srivistava, G.P., Stankiewicz, M., Sule-Suso, J., Sutherland, J.C., Surman, M., Svensson, S., Taylor, A.O., Temmerman, W.M., Thomas, A., Tiddy, G.J., Tobin, M., Towns-Andrews, Elizabeth, Towrie, M., Truscott, G., Tuckett, R.P., Turner, Tracy, Twigg, M.V., Vagdama, P., van der Hart, H.W., Volk, M., Vrakkring, M.J.J., Walker, I.C., Wander, A., Wasserman, S.P., Watanabe, M., Weightman, P., Welton, T., West, J.B., Wharton, C.W., Whitehead, J.C., Williams, G.P., Winick, H., Withnall, R., Woodruff, D.P., and Zayats, A.

Subjects
Q1
Published
2001

15. ISO spectroscopy of circumstellar dust

Author

Waters, L.B.F.M., Molster, F.J., Hony, S., Kemper, F., Yamamura, I., de Jong, T., Tielens, A.G.G.M., Waelkens, C., Sitko, M.L., Sprague, A.L., Lynch, D.K., and Low Energy Astrophysics (API, FNWI)

Published
2000

20. The composition and nature of the dust shell surrounding the binary AFGL 4106

Author

Molster, F.J., Waters, L.B.F.M., Trams, N.R., van Winckel, H., Decin, L.K.E., van Loon, J.T., Jaeger, C., Henning, T., Kaufl, H.U., de Koter, A., Bouwman, J., and Low Energy Astrophysics (API, FNWI)

Subjects
Astrophysics (astro-ph), FOS: Physical sciences, Astrophysics
Abstract

We present infrared spectroscopy and imaging of AFGL~4106. The 2.4-5 micron ISO-SWS spectrum reveals the presence of a cool, luminous star (T_eff ~ 3750 K) in addition to an almost equally luminous F star (T_eff ~ 7250 K). The 5-195 micron SWS and LWS spectra are dominated by strong emission from circumstellar dust. We find that the dust consists of amorphous silicates, with a minor but significant contribution from crystalline silicates. The amorphous silicates consist of Fe-rich olivines. The presence of amorphous pyroxenes cannot be excluded but if present they contain much less Fe than the amorphous olivines. Comparison with laboratory data shows that the pure Mg-end members of the crystalline olivine and pyroxene solid solution series are present. In addition, we find strong evidence for simple oxides (FeO and Al2O3) as well as crystalline H2O ice. Several narrow emission features remain unidentified. Modelling of the dust emission using a dust radiation transfer code shows that large grains (~1 micron) must be present and that the abundance of the crystalline silicates is between 7 and 15% of the total dust mass, depending on the assumed enstatite to forsterite ratio, which is estimated to be between 1 and 3. The amorphous and crystalline dust components in the shell do not have the same temperature, implying that the different dust species are not thermally coupled. We find a dust mass of ~3.9 x 10^-2 M_sol expelled over a period of 4 x 10^3 years for a distance of 3.3 kpc. The F-star in the AFGL~4106 binary is likely a post-red-supergiant in transition to a blue supergiant or WR phase., 22 pages (including 12 figures), accepted by Astronomy and Astrophysics

Published
1999

21. A silicate carbon star as seen by ISO

Author

Yamamura, I., de Jong, T., Waters, L.B.F.M., Molster, F.J., Kessler, M.F., Cox, P., and Low Energy Astrophysics (API, FNWI)

Published
1999

23. ISO observations of AGB and post AGB stars

Author

Waters, L.B.F.M., Beintema, D.A., Cami, J., de Graauw, Th., Hony, S., de Jong, T., Justtanont, K., Kemper, F., de Koter, A., van Loon, J.T., Molster, F.J., Tielens, A.G.G.M., Waelkens, C., van Winckel, H., Yamamura, I., Kessler, M.F., Cox, P., and Low Energy Astrophysics (API, FNWI)

Published
1999

26. Circumstellar silicate mineralogy

Author

Tielens, A.G.G.M., Waters, L.B.F.M., Molster, F.J., Justtanont, K., Waelkens, C., van der Hucht, K.A., Zaal, P.A., and Low Energy Astrophysics (API, FNWI)

Published
1998

27. The binary RV Tauri star AC Her and evidence for a long-lived dust-disc

Author

Winckel, H. van, Waelkens, C., Waters, L.B.F.M., Molster, F.J., Udry, S., Bakker, E.J., and TNO Fysisch en Elektronisch Laboratorium

Subjects
Stars: evolution, Physics, Stars: individual: AC Her, HD 44179, Stars: AGB and post-AGB, evolution [Stars], AGB and post-AGB [Stars], individual: AC Her, HD 44179 [Stars], binaries: close [Stars], Stars: binaries: close
Abstract

We present in this letter a homogeneous set of CORAVEL radial velocity measurements of the well studied RV Tauri star AC Her showing it to be a binary with a period of 1196 ± 6 days. The photospheric abundances are deduced using high resolution, high signal-to-noise optical spectra and prove that AC Her is another RV Tauri star displaying depletion of refractory elements, strengthening the relation between binarity and the depletion process. Our full ISO-SWS spectrum shows that the unusual broad emission feature at 8-12 μm is due to a high crystallisation fraction of the circumstellar silicates. We review all observational evidence that the circumstellar material is trapped in a long-lived disc in the system similar to what is observed in the Red Rectangle nebula.

Published
1998

29. ISO's view on AFGl 4106

Author

Molster, F.J., Waters, L.B.F.M., van Loon, J.T., de Jong, T., Bouwman, J., Yamamura, I., Trams, N.R., van Winckel, H., Waelkens, C., Henning, T., van der Hucht, K.A., Zaal, P.A., and Low Energy Astrophysics (API, FNWI)

Published
1998

31. The beta Pic phenomenon in Herbig Ae/Be stars: UV observations

Author

Grady, C.A., Perez, M.R., Talavera, A., The, P.S., de Winter, D., Molster, F.J., van den Ancker, M.E., Bjorkman, K.S., Sitko, M.L., Grinin, V.P., Buss, R.H., Calvet, N., Johnson, S.D., McCollum, B., Vidal-Madjar, A., Ferlet, R., and Low Energy Astrophysics (API, FNWI)

Published
1995

36. An infrared study of Roberts 22

Author

Molster, F.J., primary, Waters, L.B.F.M., additional, de Jong, T., additional, Prusti, T., additional, Zijlstra, A., additional, and Meixner, M., additional

Published
1997
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37. Bipolar outflows in OH/IR stars.

Author

Zijlstra, A.A., Chapman, J.M., te Lintel Hekkert, P., Likkel, L., Comeron, F., Norris, R.P., Molster, F.J., and Cohen, R.J.

Subjects
BIPOLAR outflows (Astrophysics), ASYMPTOTIC giant branch stars
Abstract

We investigate the development of bipolar outflows during the early post-AGB evolution. A sample of 10 OH/IR stars with irregular OH spectra and unusually large expansion velocities is observed at high angular resolution. The sample includes bipolar nebulae (e.g., OH231.8+4.2), bright post-AGB stars (HD 101584) and reflection nebulae (e.g., Roberts 22). The IRAS colour–colour diagram separates the sample into different types of objects. One group may contain the immediate progenitors to the (few) extreme bipolar planetary nebulae. Two objects show colours and chemistry very similar to the planetary nebulae with late IR-[WC] stars. One object is a confirmed close binary. A model is presented consisting of an outer AGB wind which is swept up by a faster post-AGB wind, with either the AGB or post-AGB wind being non-spherically symmetric. The interface of the two winds is shown to exhibit a linear relation between velocity and distance from the star, giving the impression of an accelerating outflow. The OH data confirm the predicted linear velocity gradients, and also reveal torus-like, uniformly expanding components. All sources are discussed in detail using optical/HST images where available. ISO data for Roberts 22 reveal a chemical dichotomy, with both crystalline silicates and PAH features being present. IRAS 16342-3814 shows a dense torus with mass 0.1 M[sub ⊙] and density of 10[sup 8] cm[sup -3]; HST data show four point-like sources located symmetrically around the nebula, near the outer edge of the dense torus. Lifetimes for the bipolar OH/IR stars are shown to be in excess of 10[sup 4] yr, longer than normal post-AGB time-scales. This suggests that the toruses or discs are near-stationary. We suggest that accretion from such a disc slows down the post-AGB evolution. Such a process could explain the link between the long-lived bipolar nebular geometry and the retarded star. [ABSTRACT FROM AUTHOR]

Published
2001
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38. Identification of iron sulphide grains in protoplanetary disks.

Author

Keller, L.P., Hony, S., Bradley, J.P., Molster, F.J., Waters, L.B.F.M., Bouwman, J., de Koter, A., Brownlee, D.E., Flynn, G.J., Henning, T., and Mutschke, H.

Subjects
SULFUR compounds, DISKS (Astrophysics)
Abstract

Identifies iron sulphide grains in protoplanetary disks. Reduction of sulphur in cold dense molecular clouds; Characteristics of pyrrhotite; Mechanism of iron sulphide destruction.

Published
2002
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39. Detection of carbonates in dust shells around evolved stars.

Author

Kemper, F., Jäger, C., Waters, L.B.F.M., Henning, Th., Molster, F.J., Barlow, M.J., Lim, T., and de Koter, A.

Subjects
CALCITE, DOLOMITE, CARBONATES, COSMIC dust
Abstract

Reports on the discovery of the carbonates calcite and dolomite in the dust shells of evolved stars, where the conditions are too primitive for the formation of large parent bodies with liquid water. Mineralogy of interstellar dust; Presence of carbonates in meteorites; Alternative formation mechanism for the carbonates.

Published
2002
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