Results 21 to 30 of about 577 (218)

Cepheids and other variable stars and the distance to the Galactic Centre [PDF]

Proceedings of the International Astronomical Union, 2012
AbstractWe review and discuss results of our survey of variable stars towards the Galactic Centre and their distances. In our near-infrared monitoring survey using IRSF/SIRIUS, we detected a number of Miras and Cepheids (both classical and type II) within 20 arcmin of the Galactic Centre.
openaire   +1 more source

Unveiling the Milky Way’s History Using Young & Old Population Variable Stars [PDF]

, 2022
This dissertation focuses on classical Cepheids and RR Lyrae stars as tracers of the recent star formation and the early assembly of the Milky Way, respectively.
Medina Toledo, Gustavo Enrique
core   +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

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

The reclassification of NSV 1586 from a suspected Cepheid star to a UG class system [PDF]

, 2020
On 2018 August 9, a contribution to the VSNET mailing list suggested that due to certain photometric attributes, NSV 1586 could possibly belong to the Dwarf Nova (DN) class.
Galdies, Charles, Hills, Kevin, Grech, Winston, Brincat, Stephen M.   +3 more
core  

Discovery of the Longest-period Classical Cepheid in the Milky Way

The Astrophysical Journal Letters
We report the discovery of the classical Cepheid OGLE-GD-CEP-1884 (= GDS_J1535467-555656) with the longest pulsation period known in our Galaxy. The period of 78.14 days is nearly 10 days longer than that of the previous record-holding Cepheid, S ...
I. Soszyński, D. M. Skowron, A. Udalski, P. Pietrukowicz, M. Gromadzki, M. K. Szymański, J. Skowron, P. Mróz, R. Poleski, S. Kozłowski, P. Iwanek, M. Wrona, K. Ulaczyk, K. Rybicki, M. Mróz   +14 more
doaj   +1 more source

Clinical Validation of Four Point‐of‐Care High‐Risk HPV Assays, Including Two Reduced‐Valency Assays, for Cervical Cancer Screening in Low‐Resource Settings

International Journal of Cancer, EarlyView.
High‐risk human papillomavirus (hrHPV) testing improves cervical cancer screening by facilitating earlier detection and prevention. In low‐resource settings, however, cost and increased referrals limit its use. At the same time, many new and more affordable assays lack validation.
Neerja Bhatla, MaryLuz Rol, Seema Singhal, Showket Hussain, Anushree Patil, Pranay Tanwar, Shalini Singh, Vikrant M. Bhor, Kiran Munne, Richa Vashishtha, Shachi Vashist, Eric Lucas, Richard Muwonge, Arianis Tatiana Ramírez, Anju Singh, Vikas Khan, Jyoti Rani, Nasera Firdausi, Sandeep Sisodiya, Rutuja Wakchaure, María Alejandra Picconi, Alejandro Calderón, Margo Bell, Annemie De Smet, Alex Vorsters, Gary M. Clifford, Madhavi Chandra, Jitendra Kumar, Partha Basu   +28 more
wiley   +1 more source

Milky Way Classical Cepheid Distances from Calibrated Infrared Period–Luminosity–Metallicity Relations

The Astrophysical Journal
Classical Cepheids (DCEPs) serve as fundamental standard candles for measuring cosmic distances and investigating the structure and evolution of the Milky Way disk.
Huajian Wang, Xiaodian Chen
doaj   +1 more source

Resource‐Adapted Triage Strategies for Women Testing HPV Positive With Self‐Collected Vaginal Samples in Cameroon

International Journal of Cancer, EarlyView.
Although human papillomavirus (HPV) testing is recommended for cervical cancer screening in low‐ and middle‐income countries, optimal management of HPV‐positive women remains undetermined, particularly in resource‐limited settings. Here, using data from the 3T study involving women in Cameroon, the authors evaluated the ability of extended HPV ...
Micol Murtas, Pierre Vassilakos, Ania Wisniak, Ketty Hu, Marc Arbyn, Gilles W. Tankeu Happi, Esther Abatsong, François Marcel Ndam Nsangou, Jean‐Christophe Tille, Essia Saiji, Bruno Kenfack, Patrick Petignat   +11 more
wiley   +1 more source

A Novel q-PED Method: Precise Physical Properties of a Merger-origin Binary Cepheid OGLE-LMC-CEP-1347

The Astrophysical Journal Letters
Recently, a double-lined binary classical Cepheid, OGLE-LMC-CEP-1347, was discovered with the orbital period ( P _orb  = 59 days), 5 times shorter than that of any binary Cepheid known before.
Felipe Espinoza-Arancibia, Bogumił Pilecki   +1 more
doaj   +1 more source