Results 141 to 150 of about 1,424,303 (245)

Shaping the horizontal branch: The role of envelope mass in the evolution of stripped core-helium-burning stars

Astronomy & Astrophysics
The location of a star along the horizontal branch (HB) during core-helium burning is primarily determined by the amount of mass lost by its progenitor.
Arancibia Rojas E., Zorotovic M., Vučković M., Bobrick A., Durán-Reyes A.   +4 more
doaj   +1 more source

Asymptotic giant branch stars near the sun

The Astronomical Journal, 1992
The available red and near infrared photometry of M, S, and C stars in the Bright Star Catalogue is discussed on the basis of the asymptotic giant branch (AGB) ledge in the temperature-luminosity plane that was previously found to satisfy all old disk population objects.
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

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

The Contribution of Asymptotic Giant Branch Stars to the Infrared Luminosities of Galaxies [PDF]

, 2011
Using resolved stellar photometry in Hubble Space Telescope WFC3 images of 22 nearby galaxies, we measure the fraction of near-infrared (NIR) luminosity produced by short-lived asymptotic giant branch (AGB) stars.
Melbourne, J., Girardi, L., Dalcanton, J., Williams, B., Marigo, P., MARIGO, PAOLA   +5 more
core  

Mg And Al production in intermediate-mass asymptotic giant branch stars

, 2015
We study how the production of the magnesium and aluminum isotopes in intermediate mass Asymptotic Giant Branch stars is affected by uncertainties in the 22Ne + α-capture reaction rates.
Wiescher, M., Karakas, Amanda, Lugaro, Maria Anna, Görres, Joachim, Ugalde, C.   +4 more
core   +1 more source

FEAST: Probing the Stellar Population of the Starburst Dwarf Galaxy NGC 4449 with JWST/NIRCam

The Astrophysical Journal
We present new JWST/NIRCam observations of the starburst irregular galaxy NGC 4449, obtained in Cycle 1 as part of the Feedback in Emerging extrAgalactic Star clusTers program, which we use to investigate its resolved stellar populations and their ...
Matteo Correnti, Giacomo Bortolini, Flavia Dell’Agli, Angela Adamo, Michele Cignoni, Elena Sacchi, Monica Tosi, Alex Pedrini, Anne S. M. Buckner, Daniela Calzetti, Ana Duarte-Cabral, Bruce G. Elmegreen, Helena Faustino Vieira, John S. Gallagher, Kathryn Grasha, Benjamin Gregg, Kelsey E. Johnson, Thomas S.-Y. Lai, Drew Lapeer, Sean T. Linden, Matteo Messa, Goran Ostlin, Elena Sabbi, Linda J. Smith, Paolo Ventura   +24 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

Velocity Observations of Multiple-Mode Asymptotic Giant Branch Variable Stars [PDF]

, 2002
Numerous infrared spectroscopic observations were obtained of nine asymptotic giant branch (AGB) field M giants that have multiple periods of light variability.
Lebzelter, Thomas, Hinkle, Kenneth H., Fekel, Francis C., Joyce, Richard R.   +3 more
core   +1 more source

Updates on the Ultraviolet Emission from Asymptotic Giant Branch Stars

, 2019
A comprehensive study of UV emission from asymptotic giant branch (AGB) stars with the Galaxy Evolution Explorer (GALEX) revealed that out of the 316 observed AGB stars, 57% were detected in the near-UV (NUV) bandpass and 12% were detected in the far-UV (
Montez, R., Vlemmings, Wouter, Vlemmings, Wouter,, Ramstedt, S.,, Kastner, J. H., Montez, R.,, Ramstedt, S., Kastner, J. H.,   +7 more
core   +1 more source