Results 111 to 120 of about 270 (136)

AGB and POST-AGB STARS: an Overview

1997
In the last phase of their existence stars of low and intermediate main-sequence mass, M ms below about 6 M ⊘, become very luminous red giants; in the HR-diagram they populate the “Asymptotic Giant Branch”. “AGB” stars are very rare: this phase is very brief and lasts perhaps 105 yr.
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The Circumstellar Envelope of The Post-AGB Star

2000
OH17.7-2.0 is a typical POST-AGB star. We have observed the circumstellar OH maser radiation of OH17.7-2.0 using Parkes 64m radiotelescope, Australia. We have obtained four peaks in its spectra: the both peaks are from weaker-sources found in our observation run, and the other two are from the stronger-source observed previously.
Yu Zhi-yao, J. Chapman
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Chemical Compositions of Post-AGB Stars

Symposium - International Astronomical Union, 1991
Objects that may be in a post-AGB evolutionary stage include high-latitude supergiants, UU Her and RV Tau variables, and IRAS sources identified with A- to G-type supergiants. Photospheric abundance analyses of such objects typically reveal moderate to extreme iron-group deficiencies, consistent with membership in the thick-disk or halo populations ...
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Spectroscopical Masses of Post-AGB Stars

2001
The literature has been reviewed in search of available spectroscopic parameters for the post-AGB objects. The surface gravity and the effective temperature have been used for determination of spectroscopic masses from comparison with theoretical evolutionary tracks. The derived distribution of masses is relatively narrow and concentrates around 0.55 M⊙
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Chemical Abundances in Post-AGB Stars

2015
The post-AGB type objects that have a chemical abundance study in the literature have been compiled. Based on the chemical abundance data of selected postAGB stars and related objects, we have studied the distributions in metallicity [Fe/H], carbon-oxygen ratio [C/O], and alpha-element [alpha/Fe] abundances.
Sehitoglu, Gizem, Bozkurt, Zeynep
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A census of post-AGB stars in Gaia DR3: evidence for a substantial population of Galactic post-RGB stars

Monthly Notices of the Royal Astronomical Society: Letters, 2022
René Oudmaijer, Miguel Vioque
exaly  

Polarization properties of OH masers in AGB and post-AGB stars

Astronomy and Astrophysics, 2012
Marian Szymczak, Paweł Wolak, E Gérard   +2 more
exaly  

An evolutionary catalogue of galactic post-AGB and related objects

Astronomy and Astrophysics, 2007
R Szczerba, G Stasińska
exaly  

Post-AGB Discs from Common-Envelope Evolution

Galaxies, 2018
Adam Jermyn, Robert G Izzard
exaly  

Spitzer Space Telescope spectra of post-AGB stars in the Large Magellanic Cloud – polycyclic aromatic hydrocarbons at low metallicities

Monthly Notices of the Royal Astronomical Society, 2014
Van Winckel H, Masaaki Ōtsuka, Devika Kamath   +2 more
exaly