Results 61 to 70 of about 4,442 (177)
Infrared studies of post-AGB stars and PNe
, 2016 We present infrared two color diagrams (2CDs) for a large sample of AGB stars, post-AGB stars, and planetary nebulae (PNe) to study their spectral evolution in infrared bands. We discuss possible evolutionary tracks from AGB stars to PNe on the 2CDs.
Kyung-Won Suh
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How Important Are Metal-Poor AGB Stars As Cosmic Dust Producers?
, 2015 The efficiency of dust formation in oxygen-rich AGB stars should (in theory) be metallicity dependent since they are not producing their own raw material for dust production.
Aringer, B. +2 more
core
Multiple Stellar Populations in AGB stars of Galactic Globular Clusters
, 2021 Multiple stellar populations (MPs) are a common feature of Globular Clusters (GCs). Their general properties have been widely studied among main-sequence, red giant branch (RGB) and horizontal branch (HB) stars, but a common framework is still missing at
E. P. Lagioia +10 more
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Exploring Mass-Loss in M-type AGB Stars
, 2015 Stellar winds observed in asymptotic giant branch (AGB) stars are usually attributed to a combination of stellar pulsations and radiation pressure on dust.
Höfner, Susanne, +3 more
core
Constraining Mass Loss and Lifetimes of Low Mass, Low Metallicity AGB Stars [PDF]
, 2015 The evolution and lifetimes of thermally pulsing asymptotic giant branch (TP-AGB) stars suffer from significant uncertainties. We present a detailed framework for constraining model luminosity functions of TP-AGB stars using resolved stellar populations.
Aringer, B. +9 more
core
Abundance analysis of post-AGB stars
Journal of Physics: Conference Series, 2011 Using BD+46 442 as an example, we describe our analysis of the spectra of post-AGB stars (SpTs F-K, luminosity types I-II, [Fe/H]=−2.0...+0.5), obtained with the echelle spectrograph HERMES on the 1.2 m Mercator telescope. We obtain atmospheric parameters and atomic abundances using hydrogen line profiles and equivalent widths (EW) of weak metal lines.
openaire +1 more source
Wind Acceleration in AGB Stars : Solid Ground and Loose Ends
, 2015 The winds of cool luminous AGB stars are commonly assumed to be driven by radiative acceleration of dust grains which form in the extended atmospheres produced by pulsation-induced shock waves. The dust particles gain momentum by absorption or scattering
Hofner, Susanne,
core
AGB and post-AGB stars at high angular resolution [PDF]
Symposium - International Astronomical Union, 1999 High angular resolution observations have provided some valuable information on the circumstellar environment of AGB and post-AGB stars.We review the recent results obtained in this field and focus on observations showing evidence of non-sphericity at different spatial scales (envelope, jets, binarity, maser clumps, stellar “photosphere”, hot spots ...
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Dust in AGB Stars : Transparent or Opaque?
, 2011 The optical properties of the dust particles that drive the winds of cool giant stars affect the stellar spectra in two ways: (1) indirectly, through their influence on the dynamical structure of the atmosphere/envelope and the resulting molecular ...
Aringer, B. +2 more
core
Evolution on the AGB and beyond: on the formation of H-deficient post-AGB stars [PDF]
Astrophysics and Space Science, 2001 14 pages, including 6 PostScript figures, also available from http://www.mpifr-bonn.mpg.de/div/ir-interferometry/publications ...
openaire +2 more sources