Results 21 to 30 of about 22,483 (180)

Synthetic Population of Binary Cepheids. II. The Effect of Companion Light on the Extragalactic Distance Scale

The Astrophysical Journal, 2023
Because of their period–luminosity relation (PLR), classical Cepheids play a key role in the calibration of the extragalactic distance scale and the determination of the Hubble–Lemaître constant H _0 .
Paulina Karczmarek, Gergely Hajdu, Grzegorz Pietrzyński, Wolfgang Gieren, Weronika Narloch, Radosław Smolec, Grzegorz Wiktorowicz, Krzysztof Belczynski   +7 more
doaj   +1 more source

Highlights on eclipsing binary variables from Araucaria Project

EPJ Web of Conferences, 2015
The Araucaria Project, which main goal is to provide precise determination of the cosmic distance scale, has recently made a set of discoveries involving variable stars in binary systems. Among these discoveries we highlight three: 1% precise measurement
Karczmarek Paulina, Pietrzyński Grzegorz, Gieren Wolfgang, Pilecki Bogumił, Graczyk Dariusz, Thompson Ian, Górski Marek, Konorski Piotr, Suchomska Ksenia, Nardetto Nicholas, Smolec Radoslaw   +10 more
doaj   +1 more source

High-resolution Spectroscopic Metallicities of Milky Way Cepheid Standards and Their Impact on the Leavitt Law and the Hubble Constant

The Astrophysical Journal Letters, 2023
Milky Way Cepheid variables with accurate Hubble Space Telescope photometry have been established as standards for primary calibration of the cosmic distance ladder to achieve a percent-level determination of the Hubble constant ( H _0 ).
Anupam Bhardwaj, Adam G. Riess, Giovanni Catanzaro, Erasmo Trentin, Vincenzo Ripepi, Marina Rejkuba, Marcella Marconi, Chow-Choong Ngeow, Lucas M. Macri, Martino Romaniello, Roberto Molinaro, Harinder P. Singh, Shashi M. Kanbur   +12 more
doaj   +1 more source

Convection Theory and Related Problems in Stellar Structure, Evolution, and Pulsational Stability II. Turbulent Convection and Pulsational Stability of Stars

Frontiers in Astronomy and Space Sciences, 2021
Using our non-local and time-dependent theory of convection and a fixed set of convective parameters (C1,  C2/C1 ,   C3)= (0.70,   0.50,   3.0) calibrated against the Sun, the linear non-adiabatic oscillations for evolutionary models with masses 1–20 M ...
Da-run Xiong
doaj   +1 more source

Faint (and bright) variable stars in the satellites of the Milky Way

EPJ Web of Conferences, 2017
I describe two ongoing projects related with variable stars in the satellites of the MilkyWay. In the first project, we are searching for dwarf Cepheid stars (a.k.a δ Scuti and/or SX Phe) in some of the classical dwarf spheroidal galaxies. Our goal is to
Vivas A. Katherina
doaj   +1 more source

Zwicky Transient Facility and Globular Clusters: The Period–Luminosity and Period–Wesenheit Relations for Anomalous Cepheids Supplemented with Large Magellanic Cloud Sample

The Astronomical Journal, 2022
We present the first gri -band period–luminosity (PL) and period–Wesenheit (PW) relations for the fundamental mode anomalous Cepheids. These PL and PW relations were derived from a combined sample of five anomalous Cepheids in globular cluster M92 and ...
Chow-Choong Ngeow, Anupam Bhardwaj, Matthew J. Graham, Steven L. Groom, Frank J. Masci, Reed Riddle   +5 more
doaj   +1 more source

New variable stars towards the Galactic Bulge. I. The bright regime★† [PDF]

Monthly notices of the Royal Astronomical Society, 2018
We report the detection of 1143 variable stars towards the Galactic bulge, including 320 previously uncatalogued variables, using time-series photometry extracted from data obtained with the VIMOS imager at the Very Large Telescope.
N. Kains, A. Calamida, M. Rejkuba, A. Bhardwaj, L. Inno, K. Sahu, M. Zoccali, G. Bono, F. Surot, J. Anderson, S. Casertano   +10 more
semanticscholar   +1 more source

Catalog of Integrated-light Star Cluster Light Curves in TESS

The Astronomical Journal, 2023
We present the first integrated-light, TESS-based light curves for star clusters in the Milky Way, Small Magellanic Cloud, and Large Magellanic Cloud. We explore the information encoded in these light curves, with particular emphasis on variability.
Tobin M. Wainer, Gail Zasowski, Joshua Pepper, Tom Wagg, Christina L. Hedges, Vijith Jacob Poovelil, Tara Fetherolf, James R. A. Davenport, P. Marios Christodoulou, Jack T. Dinsmore, Avi Patel, Kameron Goold, Benjamin J. Gibson   +12 more
doaj   +1 more source

Semiregular Variable Stars [PDF]

Astrophysics, 2018
Studies of semiregular variable stars by different authors are examined and the main theoretical and observational problems associated with these stars are reviewed.
L. S. Kudashkina
semanticscholar   +1 more source

Application of Artificial Intelligence in Clinical Microbiology: From Research to Practice

iLABMED, EarlyView.
This paper reviews the application of AI in clinical microbiology practice at home and abroad, including rapid pathogen identification, accurate characterization of microbial resistance patterns, optimization of laboratory workflows, and public health interventions.
Ting Ding, Yi‐Wei Tang, Xiaoke Hao
wiley   +1 more source