Results 11 to 20 of about 4,442 (177)

Magnetic fields of AGB and post-AGB stars [PDF]

Proceedings of the International Astronomical Union, 2018
AbstractThere is ample evidence for the presence of strong magnetic fields in the envelopes of (post-)Asymptotic Giant Branch (AGB) stars as well as supergiant stars. The origin and role of these fields are still unclear. This paper updates the current status of magnetic field observations around AGB and post-AGB stars, and describes their possible ...
Vlemmings, Wouter
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The mid- and far-infrared colours of AGB and post-AGB stars [PDF]

Astronomy & Astrophysics, 2006
With the advent of space missions, like SPITZER and ASTRO-F, with sensitive detectors in the near- and mid-infra red covering a reasonable field-of-view and having a good spatial resolution, it will be possible to detect individual AGB stars in Local Group galaxies.
M. A. T. Groenewegen
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ISO observations of AGB and post AGB stars

, 1999
We review some of the highlights of the ISO observing programmes dedicated to the photospheres and winds of late-type stars. The ISO mission has provided for the first time an unbiased view of the gas-phase molecular components in the extended atmospheres of cool stars.
Waters, L.BF.M., Beintema, D.A., Cami, J., de Graauw, T., Hony, S., de Jong, T., Justtanont, K., Kemper, F., de Koter, A., van Loon, J.T., Molster, F.J., Tielens, A.GG.M., Waelkens, Christoffel, Van Winckel, Hans, Yamamura, I.   +14 more
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Distance estimates for AGB stars from parallax measurements [PDF]

, 2022
Context. Estimating the distances to asymptotic giant branch (AGB) stars using optical measurements of their parallaxes is not straightforward because of the large uncertainties introduced by their dusty envelopes, their large angular sizes, and their ...
Ramstedt, Sofia, Andriantsaralaza, Miora, Ramstedt, Sofia,, Beck, Elvire De,, Vlemmings, Wouter, De Beck, E.,, Vlemmings, Wouter,, Andriantsaralaza, Miora,, Ramstedt, S., Vlemmings, W. H. T.,, W. H. T. Vlemmings, E. De Beck, De Beck, E., S. Ramstedt, Vlemmings, W. H. T., M. Andriantsaralaza, Andriantsaralaza, M., Beck, Elvire De, Ramstedt, S.,, Vlemmings, W. H. T   +19 more
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Post-Agb Stars as Extragalactic Candles [PDF]

Symposium - International Astronomical Union, 1997
The extragalactic distance scale depends heavily on one primary distance indicator: Cepheid variables. Given the conflict between stellar ages and the age of the Universe implied by H0, it is worth checking the zero point with as many independent methods as possible.
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Post-AGB stars in the LMC and SMC [PDF]

Proceedings of the International Astronomical Union, 2011
AbstractGalactic post-AGB stars show a large diversity in chemical compositions as well as in the kinematical and geometrical properties of their circumstellar material. The theoretical interpretation is hampered by the lack of good distances to almost all Galactic objects.
Hans Van Winckel, Els van Aarle, Peter R. Wood, Devika Kamath, Tom Lloyd Evans, Kenneth De Smedt, Nadya Gorlova, Clio Gielen   +7 more
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Rubidium and zirconium production in massive AGB stars

, 2016
A recent survey of a large sample of massive Galactic asymptotic giant branch (AGB) stars shows that significant overabundances of rubidium (up to 100 times solar), but merely solar zirconium, are present in these stars.
Karakas, Amanda, Lugaro, Maria Anna, Garcia-Hernandez, D. A., van Raai, M. A.   +3 more
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AGB stars in Gaia DR2

, 2019
Gaia Data Release 2 (DR2; April 25, 2018) provides astrometric and photometric data for more than a billion stars - among them many AGB stars. As part of DR2 the light curves of several hundreds of thousand variable stars, including many long-period ...
Marigo, Paola, Trabucchi, Michele, Gaia Collaboration, Pastorelli, Giada, Lebzelter, Thomas, Lecoeur-Taibi, Isabelle, Wood, Peter, Mowlavi, Nami   +7 more
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RELICS OF ANCIENT POST-AGB STARS IN A PRIMITIVE METEORITE [PDF]

The Astrophysical Journal, 2013
Graphite is one of the many presolar circumstellar condensate species found in primitive meteorites. While the isotopic compositions of low-density graphite grains indicate an origin in core-collapse supernovae, some high-density grains have extreme isotopic anomalies in C, Ca and Ti, which cannot be explained by envelope predictions of asymptotic ...
Jadhav, M., Pignatari, M., Herwig, F., Zinner, E., Gallino, R., Huss, G. R.   +5 more
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Possible Post-AGB Stars

, 2003
Radial velocities were measured for 5 potential post-AGB stars, two in the globular cluster NGC 1851 and three in the dSph galaxy Ursa Minor. All five potential PAGB stars were found to be radial velocity non-members.
Wallerstein, G., Gonzalez, G., Shetrone, M. D.   +2 more
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