Results 91 to 100 of about 1,680 (177)

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HemaSphere, Volume 10, Issue S1, June 2026.
wiley   +1 more source

Resolving the Hubble tension 68.261 and 73.510 km s−1 Mpc−1

AIP Advances
We present, when calculating distance ladders, that using the expression H = (km/Mpc)/AU (AU is the age of the universe) to describe the metric expansion of space in a universe with flat curvature, we resolve a baseline expression for the Hubble constant
Jody A. Geiger
doaj   +1 more source

A Bayesian Analysis of the Cepheid Distance Scale

The Astrophysical Journal, 2003
We develop and describe a Bayesian statistical analysis to solve the surface brightness equations for Cepheid distances and stellar properties. Our analysis provides a mathematically rigorous and objective solution to the problem, including immunity from Lutz-Kelker bias.
Barnes III, T. G., Jefferys, W. H., Berger, J. O., Mueller, P. J., Orr, K., Rodriguez, R.   +5 more
openaire   +2 more sources

The Orbit and Mass of the Cepheid AW Per

The Astrophysical Journal
The Cepheid AW Per is a component in a multiple system with a long-period orbit. The radial velocities of Griffin cover the 38 yr orbit well. An extensive program of interferometry with the Center for High Angular Resolution Astronomy array is reported ...
Nancy Remage Evans, Alexandre Gallenne, Pierre Kervella, Antoine Mérand, John Monnier, Richard I Anderson, H. Moritz Günther, Charles Proffitt, Elaine M. Winston, Grzegorz Pietrzynski, Wolfgang Gieren, Joanna Kuraszkiewicz, Narsireddy Anugu, Rachael M. Roettenbacher, Cyprien Lanthermann, Mayra Gutierrez, Gail Schaefer, Benjamin R. Setterholm, Noura Ibrahim, Stefan Kraus   +19 more
doaj   +1 more source

Araucaria Project: Pulsating stars in binary systems and as distance indicators

EPJ Web of Conferences, 2017
Pulsating stars, like Cepheids or RR Lyrae stars, are ones of the most important distance indicators. They are also key objects for testing the predictions of stellar evolution and stellar pulsation theory.
Pilecki Bogumił, Gieren Wolfgang, Pietrzyński Grzegorz, Smolec Radosław   +3 more
doaj   +1 more source

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

The Mira Distance to M101 and a 4% Measurement of H 0

The Astrophysical Journal
The giant spiral galaxy M101 is host to the nearest recent Type Ia supernova (SN 2011fe) and thus has been extensively monitored in the near-infrared to study the late-time light curve of the SN.
Caroline D. Huang, Wenlong Yuan, Adam G. Riess, Warren Hack, Patricia A. Whitelock, Nadia L. Zakamska, Stefano Casertano, Lucas M. Macri, Massimo Marengo, John W. Menzies, Randall K. Smith   +10 more
doaj   +1 more source

The Perfect Host: JWST Cepheid Observations in a Background-free Type Ia Supernova Host Confirm No Bias in Hubble-constant Measurements

The Astrophysical Journal Letters
Cycle 1 JWST observations of Cepheids in Type Ia supernova (SN Ia) hosts resolved their red-giant-dominated near-infrared backgrounds, sharply reducing crowding and showing that photometric bias in lower-resolution Hubble Space Telescope (HST) data does ...
Adam G. Riess, Siyang Li, Gagandeep S. Anand, Wenlong Yuan, Louise Breuval, Stefano Casertano, Lucas M. Macri, Dan Scolnic, Yukei S. Murakami, Alexei V. Filippenko, Thomas G. Brink   +10 more
doaj   +1 more source

The Milky Way as Seen by Classical Cepheids. I. Distances Based on Mid-infrared Photometry

The Astrophysical Journal Supplement Series
Classical Cepheids are the archetype of the standard candle, thanks to the period–luminosity relation, which allows us to measure their intrinsic brightness.
Dorota M. Skowron, Ronald Drimmel, Shourya Khanna, Alessandro Spagna, Eloisa Poggio, Pau Ramos   +5 more
doaj   +1 more source

APPLICATION OF CEPHEIDS TO DISTANCE SCALE: EXTENDING TO ULTRA-LONG PERIOD CEPHEIDS

Publications of The Korean Astronomical Society, 2015
Classical Cepheids (hereafter Cepheids) belong to a class of important variable stars that can be used to determine distances to nearby galaxies via the famous period-luminosity (PL) relations, i.e. the Leavitt Law. In turn, these distances can then be used to calibrate a host of secondary distance indicators located well within the Hubble ow, and ...
openaire   +2 more sources