Results 131 to 140 of about 9,884 (228)

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

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

Systematic Search for Water Fountain Candidates Using the Databases of Circumstellar Maser Sources

The Astrophysical Journal Supplement Series
Water fountains (WFs) are thought to be objects in the morphological evolution of the circumstellar envelopes of low- and intermediate-mass evolved stars, transitioning from spherically symmetric to asymmetric shapes.
Haichen Fan, Jun-ichi Nakashima, D. Engels, Yong Zhang, Jian-Jie Qiu, Huan-Xue Feng, Jia-Yong Xie, Hiroshi Imai, Chih-Hao Hsia   +8 more
doaj   +1 more source

THE MATHEMATICAL MODEL OF THE PHOTOMETRIC VARIABILITY AND CLASSIFICATION OF SEMIREGULAR PULSATING ASYMPTOTIC GIANTS BRANCH STARS

Odessa Astronomical Publications, 2012
The modern review of the stars which are located at the position of asymptotic giant branch at the HRdiagram is presented. The most interesting problems connected to these objects are noted, as well as attention is paid to classification and to the ...
L. S. Kudashkina
doaj   +1 more source

Spitzer observations of large amplitude variables in the LMC and IC 1613

EPJ Web of Conferences, 2017
The 3.6 and 4.5 ìm characteristics of asymptotic giant branch variables in the LMC and IC 1613 are discussed. For C-rich Mira variables there is a very clear periodluminosity-colour relation, where the [3.6] .
Whitelock Patricia A., Kasliwal Mansi, Boyer Martha   +2 more
doaj   +1 more source

Extending the cosmic distance ladder two orders of magnitude with strongly lensed Cepheids, carbon AGB stars, and RGB stars

Astronomy & Astrophysics
Gravitational lensing by galaxy clusters can create extreme magnification (μ > 1000) near the cluster caustics, thereby enabling detections of individual luminous stars in high-redshift background galaxies.
Diego J. M., Willner S. P., Palencia J. M., Windhorst R. A.   +3 more
doaj   +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

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

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
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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