Results 51 to 60 of about 5,513 (166)

Converging on the Cepheid Metallicity Dependence: Implications of Nonstandard Gaia Parallax Recalibration on Distance Measures

The Astrophysical Journal
By comparing Cepheid brightnesses with geometric distance measures including Gaia EDR3 parallaxes, most recent analyses conclude metal-rich Cepheids are brighter, quantified as γ ∼ −0.2 mag dex ^−1 .
Louise Breuval, Gagandeep S. Anand, Richard I. Anderson, Rachael Beaton, Anupam Bhardwaj, Stefano Casertano, Gisella Clementini, Mauricio Cruz Reyes, Giulia De Somma, Martin A. T. Groenewegen, Caroline D. Huang, Pierre Kervella, Saniya Khan, Lucas M. Macri, Marcella Marconi, Javier H. Minniti, Adam G. Riess, Vincenzo Ripepi, Martino Romaniello, Daniel Scolnic, Erasmo Trentin, Piotr Wielgórski, Wenlong Yuan   +22 more
doaj   +1 more source

FREQUENCY ANALYSIS OF PHOTOGRAPHIC OBSERVATIONS OF PULSATING STARS

Odessa Astronomical Publications, 2017
The Fourier analysis are performed for photoelectric and photographic B-observations (Goranskij and Shugarov, 1979) of RR Lyrae star RW Ari. Besides the main frequency f0 and four its first harmonics two more frequencies are found: f1 =f0 /3 and f2 =0 ...
V. P. Bezdenezhnyi
doaj   +1 more source

Hepatitis B Virus in Jordan: Prevalence, Incidence and Clearance From Cross‐Sectional and Cohort Studies

Journal of Viral Hepatitis, Volume 32, Issue 10, October 2025.
ABSTRACT Hepatitis B virus (HBV) infection is a global health challenge, with the World Health Organization (WHO) targeting its elimination by 2030. Jordan lacks sufficient data on HBV epidemiology, including prevalence, incidence and clearance. This study addresses these gaps through a retrospective analysis of HBV testing data from 40,268 individuals
Issa Abu‐Dayyeh, Hiam Chemaitelly, Ahmad Al Tibi, Mohammad Ghunaim, Thaer Hasan, Amid Abdelnour, Laith J. Abu‐Raddad   +6 more
wiley   +1 more source

Laboratory diagnosis of tuberculous meningitis in human immunodeficiency virus–seropositive patients: Correlation with the uniform case definition

Southern African Journal of Infectious Diseases, 2020
Background: Laboratory confirmation of the diagnosis of tuberculous meningitis (TBM) has always been problematic. Using the uniform case definition suggested by Marais et al., we determined the sensitivity of a variety of laboratory tests.
Mohammed Mitha, Melendhran Pillay, Julie Y. Moodley, Yusentha Balakrishna, Nathlee Abbai, Smita Bhagwan, Zaynah Dangor, Ahmed I. Bhigjee   +7 more
doaj   +1 more source

V659 Cen: System Members Updated

The Astronomical Journal
V659 Cen is a classical Cepheid which is part of a multiple system. Previous observations have shown that a hot companion dominates an ultraviolet spectrum and a cooler main-sequence star dominates an XMM-Newton spectrum. The Hubble Space Telescope Space
Nancy Remage Evans, Charles Proffitt, Pierre Kervella, Joanna Kuraszkiewicz, H. Moritz Günther, Richard I. Anderson, Alexandre Gallenne, Antoine Mérand, Boris Trahin, Giordano Viviani, Shreeya Shetye   +10 more
doaj   +1 more source

‘Raise the Bar’, a Canadian intervention to combat disparities in the recognition and management of iron deficiency: Development of the intervention, feasibility and implementation

British Journal of Haematology, Volume 207, Issue 5, Page 2219-2223, November 2025.
Grace H. Tang, Zoe Phillips, Susan Poutanen, Paul Yip, Davor Brinc, Elaine Goh, Mark Cheung, Menaka Pai, Curtis Oleschuk, Daniel Beriault, Cristiana Stefan, Larissa Matukas, David Good, Angela Weyand, Jillian Baker, Mark Crowther, Jacob Cogan, Nicole White‐AlHabeeb, Zahraa Mohammed‐Ali, Miranda Wozniak, Dana Nyholt, Sonieya Nagarajah, Carine Bekdache, Hui Li, Hasan Ghaffar, Kika Veljkovic, Uvaraj Uddayasankar, Lusia Sepiashvili, Peter Catomeris, Rita Selby, Michelle Sholzberg   +30 more
wiley   +1 more source

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

Stellar Pulsation and Evolution: A Combined Theoretical Renewal and Updated Models (SPECTRUM). I. Updating Radiative Opacities for Pulsation Models of Classical Cepheid and RR-Lyrae

The Astrophysical Journal
Pulsating stars are universally recognized as precise distance indicators and tracers of stellar populations. Their variability, combined with well-defined relationships between pulsation properties and intrinsic evolutionary parameters such as ...
Giulia De Somma, Marcella Marconi, Santi Cassisi, Roberto Molinaro   +3 more
doaj   +1 more source

The OGLE Collection of Variable Stars. Anomalous Cepheids in the Magellanic Clouds [PDF]

, 2015
I. Soszyński, A. Udalski, M. K. Szymański, G. Pietrzyński, Ł. Wyrzykowski, K. Ulaczyk, R. Poleski, P. Pietrukowicz, S. Kozłowski, J. Skowron, D. M. Skowron, P. Mróz, M. Pawlak   +12 more
openalex   +2 more sources

New Cepheid variables in the young open clusters Berkeley 51 and Berkeley 55 [PDF]

, 2018
M. E. Lohr, I. Negueruela, H. M. Tabernero, J. S. Clark, Fraser Lewis, P. F. Roche   +5 more
openalex   +1 more source