Results 111 to 120 of about 3,760 (219)

Modelling self-pollution of globular clusters from asymptotic giant branch stars [PDF]

, 2004
A self-consistent model of the chemical evolution of the globular cluster NGC 6752 is presented to test a popular theory that observed abundance anomalies are due to 'internal pollution' from intermediate-mass asymptotic giant branch stars.
S. Campbell, B. K. Gibson, Fenner, Y., Campbell, S., A. I. Karakas, Y. Fenner, Fenner, Y, Gibson, Bradley K, Karakas, A. I., Campbell, S, Gibson, BK, Karakas, Amanda, Lattanzio, John, Lattanzio, J. C., J. C. Lattanzio, Gibson, Brad K., Karakas, AI   +16 more
core   +1 more source

Spectral evolution of asymptotic giant branch stars

The Astrophysical Journal, 1988
L'evolution des etoiles de masse intermediaire de la branche geante asymptotique est simulee numeriquement a partir d'un modele de perte de masse simple. Les resultats sont compares aux donnees photometriques et spectrometriques enregistrees par le satellite IRAS dans le domaine ...
Kevin Volk, Sun Kwok
openaire   +1 more source

Phosphorus-bearing molecules PO and PN at the edge of the Galaxy. [PDF]

Nature, 2023
Koelemay LA, Gold KR, Ziurys LM.
europepmc   +1 more source

I-band Asymptotic Giant Branch (IAGB) Stars. II. A First Estimate of Their Precision and a Differential Zero Point

The Astronomical Journal
Hubble Space Telescope observations of 92 galaxies that have a strong showing of I -band asymptotic giant branch (IAGB) stars in their color–magnitude diagrams (CMDs) are used to measure the relative offset between the mean apparent I -band magnitudes of
Wendy L. Freedman, Barry F. Madore, Taylor Hoyt, In Sung Jang, Abigail J. Lee, Kayla A. Owens   +5 more
doaj   +1 more source

Carbon stars in populations of different metallicity

, 1998
Our current knowledge of carbon stars in the local group and beyond, is discussed. Although many carbon stars and late M-stars have been identified in external galaxies a coherent understanding in terms of the chemical evolution-and star formation rate ...
Groenewegen, M.A.T., Max-Planck-Institut fuer Astrophysik, Garching (Germany)   +1 more
core  

Rubidium, zirconium, and lithium production in intermediate-mass asymptotic giant branch stars

, 2012
Context. A recent survey of a large sample of Galactic intermediate-mass (>3 M ⊙) asymptotic giant branch (AGB) stars shows that they exhibit large overabundances of rubidium (Rb) up to 100-1000 times solar. In contrast, zirconium (Zr) is not enriched
Lugaro, Maria, Karakas, Amanda, M. A. van Raai, Yong, David, D. A. García-Hernández, D. Yong, Garcia-Hernandez, D. A., A. I. Karakas, van Raai, M. A., M. Lugaro   +9 more
core   +1 more source

Dusty Stellar Source Classification by Implementing Machine Learning Methods Based on Spectroscopic Observations in the Magellanic Clouds

The Astrophysical Journal
Dusty stellar point sources are a significant stage in stellar evolution and contribute to the metal enrichment of galaxies. These objects can be classified using photometric and spectroscopic observations using color–magnitude diagrams and infrared ...
Sepideh Ghaziasgar, Mahdi Abdollahi, Atefeh Javadi, Jacco Th. van Loon, Iain McDonald, Joana Oliveira, Amirhossein Masoudnezhad, Habib G. Khosroshahi, Bernard H. Foing, Fatemeh Fazel Hesar   +9 more
doaj   +1 more source

Long Secondary Periods in Pulsating Asymptotic Giant Branch Stars: An Investigation of their Origin

, 2015
Approximately 25%-30% of pulsating asymptotic giant branch (AGB) stars show long secondary periods (LSPs) of typical length ∼400-1500 days, roughly 10 times longer than the primary period of pulsation. Here we seek an explanation for the LSPs.
Wood, Peter R, Kawaler, S D, Olivier, Enrico A   +2 more
core   +1 more source

Theoretical Models for the Late Thermal Pulse in Post-asymptotic Giant Branch Stars: The Case of DY Cen

The Astrophysical Journal
We present theoretical predictions of the born-again scenario for post-asymptotic giant branch stars. An extensive model grid for born-again objects has been constructed, particularly including models for the very late thermal pulse with and without ...
Zhongyang Liu, C. Simon Jeffery, Xianfei Zhang, Shaolan Bi, Tanda Li   +4 more
doaj   +1 more source

A Parameter Study of 1D Atmospheric Models of Pulsating AGB Stars

Galaxies
Using the atmospheric pulsation code written by George Bowen, we have performed a parameter study examining the effects of modifying various parameters of models of oxygen-rich AGB atmospheres pulsating in the fundamental and first-overtone modes.
Henry A. Prager, Lee Anne M. Willson, Joyce A. Guzik, Michelle J. Creech-Eakman, Qian Wang   +4 more
doaj   +1 more source