Results 91 to 100 of about 3,760 (219)

On the Pre‐ and Post‐Positional Semi‐Random Graph Processes

Journal of Graph Theory, Volume 108, Issue 4, Page 819-831, April 2025.
ABSTRACT We study the semi‐random graph process, and a variant process recently suggested by Nick Wormald. We show that these two processes are asymptotically equally fast in constructing a semi‐random graph G $G$ that has property P ${\mathscr{P}}$, for the following examples of P ${\mathscr{P}}$: (1) P ${\mathscr{P}}$ is the set of graphs containing ...
Pu Gao, Hidde Koerts
wiley   +1 more source

The Chemical Composition of Asymptotic Giant Branch Stars [PDF]

International Astronomical Union Colloquium, 1989
AbstractLow resolution spectroscopic and photometric studies of Magellanic Cloud AGB stars have shown that the M → S → C sequence is the result of the third dredge-up of 12C and s-process elements in AGB stars of low mass. In this paper, data on the chemical compositions of normal Galactic M → S → C stars are reviewed and shown to be broadly consistent
openaire   +1 more source

Ecological Implications of Germination Temperature on Native and Invasive Rumex Spp.

Plant-Environment Interactions, Volume 6, Issue 2, April 2025.
ABSTRACT Rumex alpinus L. (R. alpinus) is a non‐native invasive plant in Czech mountain regions, altering ecosystem structure and function in protected areas. Rumex obtusifolius L. (R. obtusifolius) is a native species and a problematic weed in Czech meadows, while Rumex longifolius DC. (R.
Michaela Jungová, Martina Kadlecová, Vilém Pavlů, Leona Leišová‐Svobodová, Pavel Svoboda, Zdenka Martinková   +5 more
wiley   +1 more source

Agb (Asymptotic Giant Branch): Star Evolution

, 1987
Asymptotic giant branch stars are red supergiant stars of low-to-intermediate mass. This class of stars is of particular interest because many of these stars can have nuclear processed material brought up repeatedly from the deep interior to the surface ...
Becker, S. A.
core  

The s-process in asymptotic giant branch stars of low metallicity and the composition of carbon-enhanced metal-poor stars

, 2016
We present models for the slow neutron-capture process (s-process) in asymptotic giant branch stars of metallicity [Fe/H] = -2.3 and masses 0.9-6 M·.
Lugaro, Maria, Karakas, Amanda, Stancliffe, Richard, Rijs, Carlos   +3 more
core   +1 more source

Modelling of molecular bands of oxygen-rich AGB stars

, 1998
ISO observations of infrared molecular bands of oxygen-rich AGB stars are compared with synthetic spectra generated using model ...
Plez, Bertrand, Olofsson, H., Eriksson, Kjell, Gustafsson, Bengt, Ryde, Nils,   +4 more
core  

Period-Luminosity-Colour distribution and classification of Galactic oxygen-rich LPVs I. Luminosity calibrations

, 1999
The absolute K magnitudes and kinematic parameters of about 350 oxygen-rich Long-Period Variable stars are calibrated, by means of an up-to-date maximum-likelihood method, using HIPPARCOS parallaxes and proper motions together with radial velocities and,
X. Luri, Barthès, D., Luri, Xavier, Luri Carrascoso, Xavier, Alvarez, R., Mennessier, Marie Odile, Mennessier, M. O., Alvarez, Rodrigo, R. Alvarez, M. O. Mennessier, D. Barthès, I. Luminosity Calibrations   +11 more
core   +1 more source

Rb-rich Asymptotic Giant Branch stars in the Magellanic Clouds [PDF]

, 2009
We present high-resolution (R∼60,000) optical spectra of a carefully selected sample of heavily obscured and presumably massive O-rich Asymptotic Giant Branch (AGB) stars in the Magellanic Clouds (MCs).
Lugaro, Maria, Lambert, David L., A. Manchado, B. Plez, A. I. Karakas, Garcia-Hernandez, D. A., van Raai, M. A., D. L. Lambert, Manchado, A., Garcia-Lario, Pedro, Lambert, David L, Karakas, A. I., D'Antona, Francesca, M. A. Van Raai, Garcia-Lario, P., D'Antona, F., Karakas, Amanda, Plez, B., Plez, Bertrand, Lugaro, M., D. A. Garćıa-hernández, M. Lugaro   +21 more
core   +1 more source

Asymptotic giant branch stars: from understanding to predictions

, 2004
Two examples of stellar predictions from models of asymptotic giant branch (AGB) stars are presented to illustrate the difficulties associated with astronuclear studies.
N. Mowlavi
core   +1 more source

Sliding along the Eddington Limit—Heavy-Weight Central Stars of Planetary Nebulae

Galaxies, 2018
Due to thermal pulses, asymptotic giant branch (AGB) stars experience periods of convective mixing that provide ideal conditions for slow neutron-capture nucleosynthesis.
Lisa Löbling
doaj   +1 more source