Results 11 to 20 of about 236 (117)
Rotating and Expanding Gas in Binary Post-AGB Stars
Astronomy, 2022 There is a class of binary post-AGB stars (binary system including a post-AGB star) that are surrounded by Keplerian disks and outflows resulting from gas escaping from the disk. To date, there are seven sources that have been studied in detail through interferometric millimeter-wave maps of CO lines (ALMA/NOEMA). For the cases of the Red Rectangle, IW
Iván Gallardo Cava +6 more
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Evolution and Pulsations of Population I Post-AGB Stars [PDF]
Astronomy Letters, 2019 14 pages, 4 figures, accepted to Astron ...
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Polarization properties of OH masers in AGB and post-AGB stars [PDF]
Astronomy & Astrophysics, 2011 Context: Ground-state OH maser emission from late-type stars is usually polarized and remains a powerful probe of the magnetic field structure in the outer regions of circumstellar envelopes if observed with high angular and spectral resolutions. Observations in all four Stokes parameters are quite sparse and this is the most thorough, systematic study
Wolak, P., Szymczak, M., Gérard, E.
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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.
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MSX Sources in the LMC: Dust-Enshrouded AGB Stars, Post-AGB Stars and PN [PDF]
Symposium - International Astronomical Union, 2003 The Midcourse Space (MSX) Experiment (Price 1995) detected large numbers of point sources in the LMC at 8.28 μm (Egan et al. 2001). Near-infrared J H K L imaging and monitoring of the 504 MSX sources in a region of size 3° x 3.5° covering most of the LMC bar has been carried out. Spectra have been taken for most of the post-AGB stars and a selection of
P. R. Wood, M. Cohen
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Carbon and oxygen stars evolution in post-AGB phase [PDF]
Proceedings of the International Astronomical Union, 2006 Despite many studies, the post-AGB phase is still not well understood. To make progress in this field, we searched for information about proto-planetary nebulae and built a catalogue of post-AGB objects. Based on collected data we were able to trace the evolution of stars in their late stages making a distinction between carbon and oxygen-rich objects.
N. Siódmiak +3 more
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Stellar Evolution and Nucleosynthesis of Post-AGB Stars [PDF]
, 2001 I discuss recent new models of post-Asymptotic Giant Branch stellar evolution. These models aim to clarify the evolutionary origin and status of a variety of hydrogen-deficient post-AGB stars such as central stars of planetary nebulae of Wolf-Rayet spectral type, PG1159 stars or Sakurai's object.
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Near-infrared and Br_gamma observations of post-AGB stars
Astronomy & Astrophysics, 2000 We investigate the infrared properties of the IRAS sources not confirmed as PNe in Van de Steene & Pottasch (1993). We observed 28 objects in the N-band of which 20 were detected and 5 were resolved. We obtained medium resolution Br_gamma spectra and we took high resolution JHKL images of these 20 objects.
Van de Steene, GC +2 more
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Post-AGB stars in the Magellanic Clouds and neutron-capture processes in AGB stars [PDF]
Astronomy & Astrophysics, 2015 We explore modifications to the current scenario for the slow neutron capture process in asymptotic giant branch (AGB) stars to account for the Pb deficiency observed in post-AGB stars of low metallicity ([Fe/H] ~ -1.2) and low initial mass (~ 1 - 1.5 Msun) in the Large and Small Magellanic Clouds.
Lugaro, M. +5 more
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Spectroscopic and photometric monitoring of southern post-AGB stars [PDF]
International Astronomical Union Colloquium, 2004 AbstractWe present the results of contemporaneous photometric and spectroscopic monitoring of 20 post-AGB stars from Mt John University Observatory. Photometric measures were carried out using Johnson BV and Cousins RI filters, and the radial velocity measurements were acquired using spectra from an echelle spectrograph.
D.J. Pooley +3 more
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