Results 61 to 70 of about 215 (139)

Nitrogen enhancement of GN-z11 by metal pollution from supermassive stars

Astronomy & Astrophysics
Context. Spectroscopic observations by the James Webb Space Telescope (JWST) have revealed young, compact, high-redshift (z) galaxies with high nitrogen-to-oxygen (N/O) ratios. GN-z11 at z = 10.6 is one of these galaxies. Aims.
Ebihara S., Fujii M., Saitoh T., Hirai Y., Umeda H., Isobe Y., Nagele C.   +6 more
doaj   +1 more source

A Closer Look at the Origin of LINER Emission in Later-type Galaxies and Its Connection to Evolved Stars with a Machine Learning Classification Scheme

The Astrophysical Journal
Identifying the dominant ionizing sources in galaxies is essential for understanding their formation and evolution. Traditionally, spectra are classified based on their dominant ionizing source using strong emission lines and Baldwin, Phillips ...
Ahmad Nemer, Ivan Yu. Katkov, Joseph D. Gelfand, Changhyun Cho   +3 more
doaj   +1 more source

IK Pegasi and the Double-merger Path to Type Ia Supernovae

The Astrophysical Journal Letters
Recent Gaia astrometry has revealed thousands of main-sequence + white dwarf (MS+WD) binaries at separations of ∼0.1–10 au, including a subset hosting unusually massive (≳0.8 M _⊙ ) WDs.
Na’ama Hallakoun, Sahar Shahaf, Sagi Ben-Ami, Oren Ironi, Param Rekhi, Hans-Walter Rix   +5 more
doaj   +1 more source

Common envelope binary interaction simulations between a thermally pulsating AGB star and a low mass companion. [PDF]

Mon Not R Astron Soc, 2022
González-Bolívar M, De Marco O, Lau MYM, Hirai R, Price DJ.   +4 more
europepmc   +1 more source

Measuring neutron capture cross sections of radioactive nuclei: From activations at the FZK Van de Graaff to direct neutron captures in inverse kinematics with a storage ring at TRIUMF. [PDF]

Eur Phys J A Hadron Nucl, 2023
Dillmann I, Kester O, Baartman R, Chen A, Junginger T, Herwig F, Kaltchev D, Lennarz A, Planche T, Ruiz C, Vassh N.   +10 more
europepmc   +1 more source

The Fate of Oceans on First-generation Planets Orbiting White Dwarfs

The Astrophysical Journal
Several groups have recently suggested that small planets orbiting very closely around white dwarf stars could be promising locations for life to arise, even after stellar death.
Juliette Becker, Andrew Vanderburg, Joseph R. Livesey   +2 more
doaj   +1 more source

Hidden Molecular Bullets in Compact Young Planetary Nebulae

The Astronomical Journal
For the three planetary nebulae M 1-11, Vy 2-2, and Hen 2-459, we report the detection of kinematically distinct structures that exhibit different states and mechanisms of excitation in molecular hydrogen (H _2 ).
Kyle F. Kaplan, Harriet L. Dinerstein, Daniel T. Jaffe   +2 more
doaj   +1 more source

UEG Week 2024 Oral Presentations

United European Gastroenterology Journal, Volume 12, Issue S8, Page 9-200, October 2024.
wiley   +1 more source

Spectroscopic Survey of Faint Planetary-nebula Nuclei. V. The EGB 6-type Central Star of Abell 57

The Astrophysical Journal
During our spectroscopic survey of central stars of faint planetary nebulae (PNe), we found that the nucleus of Abell 57 exhibits strong nebular emission lines.
Howard E. Bond, Akshat S. Chaturvedi, Robin Ciardullo, Klaus Werner, Gregory R. Zeimann, Michael H. Siegel   +5 more
doaj   +1 more source

Dynamical mass loss at the end of thermally pulsating asymptotic giant branch stars

Astronomy & Astrophysics
Context. The thermally pulsating asymptotic giant branch (TP-AGB) phase plays a key role in the evolution of low- to intermediate-mass stars because it drives the mass loss that influences their final stages and contributes to galactic chemical ...
Cui Yingzhen, Wang Song, Meng Xiangcun, Liu Jifeng, Ma Shuguo, Zhao Weitao   +5 more
doaj   +1 more source