Results 161 to 170 of about 29,820 (298)

Evolution and Nucleosynthesis in Extremely Metal-Poor, Asymptotic Giant Branch Stars [PDF]

, 2009
Nobuyuki Iwamoto
openalex   +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

CEMP-s and CEMP-s/r stars: last update

, 2013
We provide an updated discussion of the sample of CEMP-s and CEMP-s/r stars collected from the literature. Observations are compared with the theoretical nucleosynthesis models of asymptotic giant branch (AGB) stars presented by Bisterzo et al.
Bisterzo, S., Cristallo, S., Gallino, R., Kaeppeler, F., Straniero, O., Wiescher, M.   +5 more
core   +1 more source

The s-Process in Rotating Asymptotic Giant Branch Stars

, 2003
(abridged) We model the nucleosynthesis during the thermal pulse phase of a rotating, solar metallicity AGB star of 3M_sun. Rotationally induced mixing during the thermal pulses produces a layer (~2E-5M_sun) on top of the CO-core where large amounts of ...
Alongi M., Dreizler S., Falk Herwig, Freytag B., Goriely S., Groenewegen M. A. T., Herwig F., Herwig F., Herwig F., Herwig F., Icke V., Jorissen A., Jorissen A., Koester D., Koesterke L., Langer N., Langer N., Maria Lugaro, Marigo P., Marigo P., Mazzitelli I., McWilliam A., Mowlavi N., Mowlavi N., Norbert Langer, Reimers C., Salasnich B., Schaller G., Spruit H. C., Stasinska G., Van Winckel H., Weidemann V., Weidemann V., Xiong D. R.   +33 more
core   +1 more source

ON THE RELATION BETWEEN THE MYSTERIOUS 21 μm EMISSION FEATURE OF POST-ASYMPTOTIC GIANT BRANCH STARS AND THEIR MASS-LOSS RATES [PDF]

, 2016
Ajay Mishra, Aigen Li, B. W. Jiang
openalex   +1 more source

Degenerate Thermal Pulses in Asymptotic Giant Branch Stars

The Astrophysical Journal, 1998
We report on the discovery of a new kind of thermal pulse in intermediate-mass asymptotic giant branch (AGB) stars. Deep dredge-up during normal thermal pulses on the AGB leads to the formation of a long unburnt tail in the helium profile. Eventually, the tail ignites under partially degenerate conditions, producing a strong shell flash with very deep ...
C. A. Frost, J. C. Lattanzio, P. R. Wood
openaire   +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

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

Evolution and nucleosynthesis in low mass Asymptotic Giant Branch stars [PDF]

, 2008
S. Cristallo
openalex   +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