Results 61 to 70 of about 931,455 (366)

Center-to-limb polarization in continuum spectra of F, G, K stars

, 2015
Context. Scattering and absorption processes in stellar atmosphere affect the center-to-limb variations of the intensity (CLVI) and the linear polarization (CLVP) of stellar radiation. Aims. There are several theoretical and observational studies of CLVI
Berdyugina, S. V., Kostogryz, N. M.
core   +1 more source

Bakerian Lecture: The Structure and Opacity of a Stellar Atmosphere

The general problem .—“Stellar atmosphere" is the name given loosely to the outer portions of a star. The stellar atmosphere is divided observationally into three superincumbent layers, named the photospheric layers, the reversing layer and the ...
E. A. Milne
semanticscholar   +1 more source

Peptide‐based ligand antagonists block a Vibrio cholerae adhesin

FEBS Letters, EarlyView.
The structure of a peptide‐binding domain of the Vibrio cholerae adhesin FrhA was solved by X‐ray crystallography, revealing how the inhibitory peptide AGYTD binds tightly at its Ca2+‐coordinated pocket. Structure‐guided design incorporating D‐amino acids enhanced binding affinity, providing a foundation for developing anti‐adhesion therapeutics ...
Mingyu Wang, Grace Du, Charity Yongo‐Luwawa, Angelina Lu, Brett Kinrade, Kim Munro, Karl E. Klose, William D. Lubell, Peter Davies, Shuaiqi Guo   +9 more
wiley   +1 more source

Enriched volatiles and refractories but deficient titanium on the day-side atmosphere of WASP-121b revealed by JWST/NIRISS

Astronomy & Astrophysics
Context. With day-side temperatures elevated enough for all atmospheric constituents to be present in gas form, ultra-hot Jupiters offer a unique opportunity to probe the composition of giant planets. Aims.
Pelletier S., Coulombe L.-P., Splinter J., Benneke B., MacDonald R. J., Lafrenière D., Cowan N. B., Allart R., Rauscher E., Frazier R. C., Meyer M. R., Albert L., Dang L., Doyon R., Ehrenreich D., Flagg L., Johnstone D., Langeveld A. B., Lim O., Piaulet-Ghorayeb C., Radica M., Rowe J., Taylor J., Turner J. D.   +23 more
doaj   +1 more source

Pulsation-induced atmospheric dynamics in M-type AGB stars. Effects on wind properties, photometric variations and near-IR CO line profiles

, 2017
Wind-driving in asymptotic giant branch (AGB) stars is commonly attributed to a two-step process. First, matter in the stellar atmosphere is levitated by shock waves, induced by stellar pulsation, and second, this matter is accelerated by radiation ...
Eriksson, K., Höfner, S., Liljegren, S., Nowotny, W.   +3 more
core   +1 more source

Stellar atmospheres

This is a pre-print of a chapter for the Encyclopedia of Astrophysics (edited by I. Mandel, section editor F.R.N.
Puls, Joachim, Herrero, Artemio, Prieto, Carlos Allende   +2 more
openaire   +2 more sources

Radiative Transfer in Stellar Atmospheres [PDF]

EAS Publications Series, 2010
This review presents basic equations for the solution of the NLTE radiative transfer problem for trace elements and methods for its solution are summarized. The importance of frequency coupling in radiative transfer in stellar atmospheres is emphasized.
openaire   +2 more sources

The role of histone modifications in transcription regulation upon DNA damage

FEBS Letters, EarlyView.
This review discusses the critical role of histone modifications in regulating gene expression during the DNA damage response (DDR). By modulating chromatin structure and recruiting repair factors, these post‐translational modifications fine‐tune transcriptional programmes to maintain genomic stability.
Angelina Job Kolady, Siyao Wang
wiley   +1 more source

JWST TRAPPIST-1 e/b Program: Motivation and First Observations

The Astronomical Journal
One of the forefront goals in the field of exoplanets is the detection of an atmosphere on a temperate terrestrial exoplanet, and among the best suited systems to do so is TRAPPIST-1.
Natalie H. Allen, Néstor Espinoza, V. A. Boehm, Caleb I. Cañas, Kevin B. Stevenson, Nikole K. Lewis, Ryan J. MacDonald, Brett M. Morris, Eric Agol, Knicole Colón, Hannah Diamond-Lowe, Ana Glidden, Amélie Gressier, Jingcheng Huang, Zifan Lin, Douglas Long, Dana R. Louie, Meredith A. MacGregor, Laurent Pueyo, Benjamin V. Rackham, Sukrit Ranjan, Sara Seager, Guadalupe Tovar Mendoza, Jeff A. Valenti, Daniel Valentine, Roeland P. van der Marel, Hannah R. Wakeford   +26 more
doaj   +1 more source

Hα AND Hβ PROFILE VARIATIONS IN THE SPECTRA OF THE STAR 55 CYG

Odessa Astronomical Publications, 2017
We  study  the  variability  of  the  Hα and Hβ  lines in the spectra of 55 Cyg based on observations  acquired  in  2014  on  the  2-m  telescope  of  Shamakhy Astrophysical  Observatory.
Y. M. Maharramov
doaj   +1 more source