Results 71 to 80 of about 399 (192)

Systematics in the Cepheid and TRGB Distance Scales: Metallicity Sensitivity of the Wesenheit Leavitt Law

The Astrophysical Journal
Using an updated and significantly augmented sample of Cepheid and tip of the red giant branch (TRGB) distances to 28 nearby spiral and irregular galaxies, covering a wide range of metallicities, we have searched for evidence of a correlation of the zero-
Barry F. Madore, Wendy L. Freedman
doaj   +1 more source

Ureteroenteric strictures following retrosigmoid vs. conventional ileal conduit – The MOSAIC study (The DaBlaCa‐16 study)

BJU International, Volume 136, Issue 5, Page 858-865, November 2025.
Objectives To evaluate the rate of left‐sided ureteroenteric strictures (UES) following robot‐assisted radical cystectomy (RARC) with a retrosigmoid ileal conduit compared to a conventional ileal conduit in a randomised controlled trial (RCT). Patients and Methods This multicentre, RCT included 303 patients undergoing RARC between May 2020 and August ...
Simone Buchardt Brandt, Stefanie Korsgaard Körner, Rikke Vilsbøll Milling, Ninna Kjær Nielsen, Ulla Nordström Joensen, Lasse Bro, Thor Knak Jensen, Astrid Helene Livbjerg, Knud Fabrin, Marie‐Louise Vrang, Gitte Wrist Lam, Michael Vangedal, Pernille Skjold Kingo, Jørgen Bjerggaard Jensen   +13 more
wiley   +1 more source

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

Chicago–Carnegie Hubble Program: A Multiwavelength Search for the Effects of Metallicity on the Cepheid Distance Scale. I. Empirical Evidence

The Astrophysical Journal
Understanding 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

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

OGLE-IV Period–Luminosity Relation of the LMC: An Analysis Using Mean and Median Magnitudes

The Astronomical Journal
The Period–Luminosity (PL) relation for Cepheid variable stars in the LMC is crucial for distance measurements in astronomy. This study analyzes the impact of using the median rather than the mean of the PL relation’s slope and zero-point.
Jaime Muñoz, Alejandro García-Varela, Santiago Henao-Castellanos, Beatriz Sabogal, Luis Felipe Giraldo, Jorge Martínez   +5 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

IS POLARIS LEAVING THE CEPHEID INSTABILITY STRIP?

Odessa Astronomical Publications, 2017
Although Polaris is generally regarded as an overtone pulsator that may soon switch to pulsation in the fundamental mode, it is argued that the variable is actually crossing the instability strip for the first time and is in the process of leaving the ...
D. G. Turner
doaj   +1 more source

The MACHO Project LMC Variable Star Inventory: XII. Three Cepheid Variables in Eclipsing Binaries

, 2002
We present a method for solving the lightcurve of an eclipsing binary system which contains a Cepheid variable as one of its components as well as the solutions for three eclipsing Cepheids in the Large Magellanic Cloud (LMC). A geometric model is constructed in which the component stars are assumed to be spherical and on circular orbits.
Alcock, C., Allsman, R. A., Alves, D. R., Becker, A. C., Bennett, D. P., Cook, K. H., Drake, A. J., Freeman, K. C., Griest, K., Hawley, S. L., Keller, S., Lehner, M. J., Lepischak, D., Marshall, S. L., Minniti, D., Nelson, C. A., Peterson, B. A., Popowski, P., Pratt, M. R., Quinn, P. J., Rodgers, A. W., Suntzeff, N., Sutherland, W., Vandehei, T., Welch, D. L.   +24 more
openaire   +2 more sources

Mining Sky Surveys for Astrophysically Interesting Variable Stars: The Cepheid Period Range

AIP Conference Proceedings, 2009
We have undertaken a project to discover new type II Cepheids in two large‐area sky surveys. However, most of the candidates from the surveys differ from type II Cepheids in their amplitude and period distributions and they form a separate, cooler sequence relative to the Cepheids in a temperature—gravity plot.
Edward G. Schmidt, Joyce Ann Guzik, Paul A. Bradley   +2 more
openaire   +2 more sources