Results 81 to 90 of about 296 (183)

Stellar Variability and Distance Indicators in the Near-infrared in Nearby Galaxies. II. Pulsating Stars in the Carina Dwarf Spheroidal

The Astronomical Journal
We present homogeneous, near-infrared ( JHK _s bands) time-series observations of the classical Carina dwarf spheroidal (dSph) galaxy to determine accurate and precise distances using the pulsating stars as standard candles.
Chow-Choong Ngeow, Anupam Bhardwaj, Prashant Nishad, Susmita Das   +3 more
doaj   +1 more source

New variable and multiple stars in the lower part of the Cepheid instability strip [PDF]

Communications in Asteroseismology, 2007
We obtained high-resolution spectra for 33 A-type stars during 4 consecutive nights. All our targets are Hipparcos programme stars located in the lower part of the Cepheid instability strip which show hints for variability in radial velocity of a yet unidentied nature.
openaire   +1 more source

Type II Cepheids: period-luminosity-metallicity relations for the Population II distance scale

Frontiers in Astronomy and Space Sciences
Type II Cepheids are a class of pulsating variable stars that play a critical role in our understanding of stellar evolution, distance measurement and tracing the structure and kinematics of old stars in nearby galaxies.
Susmita Das, Susmita Das, Susmita Das, Anupam Bhardwaj, Marcella Marconi   +4 more
doaj   +1 more source

Toward a Comprehensive Grid of Cepheid Models with MESA. II. Impact of Physical and Numerical Assumptions on Elemental Abundances

The Astrophysical Journal Supplement Series
Modern tools for modeling stellar evolution, such as the Modules for Experiments in Stellar Astrophysics, offer state-of-the-art implementations of stellar theories.
O. Ziółkowska, R. Smolec, A. Thoul, R. Singh Rathour, V. Hocdé   +4 more
doaj   +1 more source

Analysis of pulsating variable stars using the visibility graph algorithm. [PDF]

PLoS One, 2021
Muñoz V, Garcés NE.
europepmc   +1 more source

Large-scale Spiral Structure of the Milky Way Traced by Young Classical Cepheids

The Astrophysical Journal Letters
Using 985 classical Cepheids younger than 100 Myr, we investigate the large-scale spiral structure of the Milky Way by comparing their spatial and kinematic distributions with the R19 (four-arm) and X23 (multiple-arm) spiral-arm models.
Z. H. Lin, C. J. Hao, D. J. Liu, Y. J. Li, J. J. Li, Y. W. Dong, Y. X. He, Jarken Esimbek   +7 more
doaj   +1 more source

The Period Radius Relation for Cepheid Variable Stars [PDF]

Monthly Notices of the Royal Astronomical Society, 1973
R. Woolley, B. Carter
openaire   +1 more source

Vaginal-perianal or vaginal-perineal compared with vaginal-rectal culture-based screening for Group B Streptococci (GBS) colonization during the third trimester of pregnancy: a systematic review and meta-analysis. [PDF]

BMC Pregnancy Childbirth, 2022
Nadeau HCG, Bisson C, Chen X, Zhao YD, Williams M, Edwards RK.   +5 more
europepmc   +1 more source

Gaia DR3 Open Cluster Cepheids: A Unified Catalog with Calibrated Period–Age and Period–Wesenheit Relations

The Astronomical Journal
Classical Cepheids (CCs) in Galactic open clusters (OCs) provide essential observational constraints for calibrating the period–age relation (PAR) and the period–Wesenheit relation (PWR) of CCs. However, distant and long-period OC Cepheids remain limited,
Shunhong Deng, Zhihong He, Anbing Ren, Qian Cui, Xiaoyue Zhou, Liming Peng, Chenxin Wang, Ziang Chen, Yangping Luo, Kun Wang   +9 more
doaj   +1 more source

The Role of Next-Generation Sequencing (NGS) in the Management of Tuberculosis: Practical Review for Implementation in Routine. [PDF]

Pathogens, 2023
Beviere M, Reissier S, Penven M, Dejoies L, Guerin F, Cattoir V, Piau C.   +6 more
europepmc   +1 more source