Results 91 to 100 of about 5,915 (202)

Stellar Variability and Distance Indicators in the Near-infrared in Nearby Galaxies. I. RR Lyrae and Anomalous Cepheids in Draco Dwarf Spheroidal

The Astronomical Journal
The Draco Dwarf spheroidal (dSph) galaxy is one of the nearest and the most dark-matter-dominated satellites of the Milky Way. We obtained multiepoch near-infrared (NIR, JHK _s ) observations of the central region of Draco dSph covering a sky area of ∼21′
Anupam Bhardwaj, Marina Rejkuba, Chow-Choong Ngeow, Marcella Marconi, Vincenzo Ripepi, Abhinna Sundar Samantaray, Harinder P. Singh   +6 more
doaj   +1 more source

Non-particle dark matter from Hubble parameter

European Physical Journal C: Particles and Fields, 2019
The measurements of the Hubble parameter using the cosmic microwave background radiation appear to be inconsistent with the measurements of this parameter using Cepheid variable stars.
Nikodem J. Popławski
doaj   +1 more source

Impact of Real‐Time, On‐Demand Influenza and Respiratory Syncytial Virus Testing at Point‐of‐Care on Antibiotic Prescribing and Clinical Outcome in Pediatric Outpatients With Acute Respiratory Illness: A Prospective, Quasi‐Randomized, Controlled Study

Influenza and Other Respiratory Viruses, Volume 20, Issue 1, January 2026.
ABSTRACT Background Rapid and accurate detection and identification of viral pathogens have an impact on physician decision‐making for patients with acute respiratory illness (ARI). We aimed to evaluate the Xpert Xpress Flu/RSV test for the management of antibiotic prescribing in pediatric outpatients with ARI. Methods We performed a prospective, quasi‐
Yue Xie, Tianming Chen, Bing Liu, Haijuan Xiao, Xinghui Gao, Qinjing Li, Bing Hu, Cuiying Liu, Chengsong Zhao, Yuchuan Li, Xin Xu, Mengran Li, Yi‐Wei Tang, Gang Liu   +13 more
wiley   +1 more source

Self-consistent Nonlinear Classical Cepheid Pulsations during Stellar Evolution with MESA

The Astrophysical Journal
We extend the time-dependent convection (TDC) treatment in MESA by introducing eddy-viscous dissipation. This software change brings MESA-TDC into closer alignment with the radial stellar pulsation (RSP) framework of the MESA-RSP module.
Ebraheem Farag, Earl P. Bellinger, Philip Mocz, Selim Kalici, Radoslaw Smolec, Shashi Kanbur, Kyra Bettwy, Christopher Lindsay   +7 more
doaj   +1 more source

The evolution of the Galactic nuclear bulge traced by Cepheid variable stars [PDF]

Journal of Physics: Conference Series, 2012
The Galactic nuclear bulge hosts significant populations of young stars, within a few hundred parsecs around the Galactic Centre, unlike the more extended bulge. Recently, we discovered classical Cepheid variable stars (hereinafter Cepheids) in the Galactic nuclear bulge.
openaire   +1 more source

Systematics in the Cepheid and TRGB Distance Scales: Metallicity Sensitivity of the Wesenheit Leavitt Law

The Astrophysical Journal
Using an updated and significantly augmented sample of Cepheid and tip of the red giant branch (TRGB) distances to 28 nearby spiral and irregular galaxies, covering a wide range of metallicities, we have searched for evidence of a correlation of the zero-
Barry F. Madore, Wendy L. Freedman
doaj   +1 more source

No Evidence for Classical Cepheids and a New Dwarf Galaxy Behind the Galactic Disk

, 2015
Based on data from the ongoing OGLE Galaxy Variability Survey (OGLE GVS) we have verified observed properties of stars detected by the near-infrared VVV survey in a direction near the Galactic plane at longitude l~-27 deg and recently tentatively ...
Kozlowski, S., Mroz, P., Pawlak, M., Pietrukowicz, P., Pietrzynski, G., Poleski, R., Skowron, J., Soszynski, I., Szymanski, M. K., Udalski, A., Ulaczyk, K., Wyrzykowski, L.   +11 more
core   +1 more source

The Orbit and Mass of the Cepheid AW Per

The Astrophysical Journal
The Cepheid AW Per is a component in a multiple system with a long-period orbit. The radial velocities of Griffin cover the 38 yr orbit well. An extensive program of interferometry with the Center for High Angular Resolution Astronomy array is reported ...
Nancy Remage Evans, Alexandre Gallenne, Pierre Kervella, Antoine Mérand, John Monnier, Richard I Anderson, H. Moritz Günther, Charles Proffitt, Elaine M. Winston, Grzegorz Pietrzynski, Wolfgang Gieren, Joanna Kuraszkiewicz, Narsireddy Anugu, Rachael M. Roettenbacher, Cyprien Lanthermann, Mayra Gutierrez, Gail Schaefer, Benjamin R. Setterholm, Noura Ibrahim, Stefan Kraus   +19 more
doaj   +1 more source

The detection of a companion star to the Cepheid variable Eta Aquilae

The Astrophysical Journal, 1980
Ultraviolet spectra have been obtained with IUE of the classical Cepheid Eta Aquilae at several phases in the 7.18 day period. Significant ultraviolet emission is detected at wavelengths less than 1600 A, where little flux is expected from classical Cepheids.
J. T. Mariska, G. A. Doschek, U. Feldman
openaire   +1 more source

Chicago–Carnegie Hubble Program: A Multiwavelength Search for the Effects of Metallicity on the Cepheid Distance Scale. I. Empirical Evidence

The Astrophysical Journal
Understanding the effects of metallicity on the multiwavelength properties of Cepheids is of continuing importance for their effective use as extragalactic distance indicators and an accurate measure of the Hubble constant, H _0 .
Barry F. Madore, Wendy L. Freedman
doaj   +1 more source