Results 51 to 60 of about 1,680 (177)
The Classical Cepheid Distance scale in the NIR bands [PDF]
Journal of Physics: Conference Series, 2012 The Period-Luminosity (PL) relation of classical Cepheids is one of the most popular standard candle, being the first rung of the cosmic distance ladder. We discuss both theoretical and empirical features of the PL, Period-Luminosity-Color (PLC) and Period-Wesenheit (PW) relations using the largest optical (V,I; OGLEIII) and near-infrared (NIR, J,H,Ks;
Inno L. +7 more
openaire +2 more sources
Causes and Seasonality of Upper Respiratory Infections in Adults in Lesotho (2021–2022) (CORIAL)
Canadian Journal of Infectious Diseases and Medical Microbiology, Volume 2026, Issue 1, 2026.Background Upper respiratory tract infections cause morbidity and a high burden on healthcare systems worldwide, especially in low‐ and lower middle‐income countries. Recent studies throughout Africa indicate seasonal patterns that deviate from those previously described in settings with temperate climates.
Nikita Sass +15 more
wiley +1 more source
The Astronomical JournalIt is beneficial to calibrate the period–Wesenheit–metallicity relation (PWZR) of Delta Cephei stars (DCEPs), i.e., classical Cepheids, using accurate parallaxes of associated open clusters (OCs) from Gaia data release 3 (DR3).
Huajian Wang +5 more
doaj +1 more source
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 +7 more
doaj +1 more source
THE PULSATION MODE AND DISTANCE OF THE CEPHEID FF AQUILAE [PDF]
The Astrophysical Journal, 2013 To appear in ...
Turner, David Gerald, 1945- +3 more
openaire +3 more sources
The Astrophysical JournalUnderstanding 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
Z-Distribution and Period Gradient of Classical Cepheids in the Galactic Plane [PDF]
Journal of Astronomy and Space Sciences, 1986 The z-coordinate distribution of cepheids was studied and the finding of Fernie(1968) that the Cepheid layer is inclined toward a formal Galactic plane and the Sun is located above the cepheid plane was confirmed.
Chulhee Kim
doaj
Cepheids as Distance Indicators
, 1996 We review the use of Cepheids as distance indicators with particular emphasis on the methods which have been applied to HST observations of Cepheids. The calibration of the period-luminosity relations is examined in detail and we identify possible problems with the existing calibrations. New V- and I-band period luminosity relations are presented based
openaire +2 more sources