Results 111 to 120 of about 10,963 (195)

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

SPECTROSCOPIC INVESTIGATIONS OF GALACTIC CLUSTERS WITH ASSOCIATED CEPHEID VARIABLES. II. NGC 5662 AND V CEN

Odessa Astronomical Publications, 2018
We present the results of a spectroscopic and photometric investigation of 15 objects from the open cluster NGC 5662, which contains the Cepheid V Cen. Besides the Cepheid, we studied one G-supergiant, two K-giants, four B-giants, and seven main sequence
I. A. Usenko, A. Yu. Kniazev, V. V. Kovtyukh, T. V. Mishenina, A. S. Miroshnichenko, D. G. Turner, Yu. I. Protsyuk   +6 more
doaj   +1 more source

A Cepheid Distance to NGC 4603 in Centaurus

, 1999
In an attempt to use Cepheid variables to determine the distance to the Centaurus cluster, we have obtained images of NGC 4603 with the Hubble Space Telescope on 9 epochs using WFPC2 and the F555W and F814W filters.
Alibert Y., Barry F. Madore, Graham J. A., Guzman R., Jeffrey A. Newman, Jerjen H., Labhardt L., Lucey J. R., Lucey J. R., Lucey J. R., Marc Davis, N. Silbermann, Nevalainen J., Nusser A., Peter B. Stetson, Randy Phelps, Sasselov D. D., Stein P., Stephen E. Zepf, Wendy L. Freedman, Willick J. A.   +20 more
core   +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

DISCOVERY OF THE FIRST SUPER-LITHIUM RICH BEAT CEPHEID: V371 PER

Odessa Astronomical Publications, 2012
Four high-resolution spectra of the double-mode Cepheid V371 Per, obtained for the first time, showed the presence of the abnormally strong Li i 6707.76 Å line.
V. V. Kovtyukh, N. I. Gorlova, M. Hillen
doaj   +1 more source

A Cepheid distance to NGC 4258

, 1999
Approved for publication in Nature. Strictly embargoed from publicity until one week before publication.
Maoz, Eyal, Newman, Jeffrey A., Ferrarese, Laura, Stetson, Peter B., Zepf, Stephen E., Davis, Marc, Freedman, Wendy L., Madore, Barry F.   +7 more
openaire   +2 more sources

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

The distances of cepheid variables [PDF]

Monthly Notices of the Royal Astronomical Society, 1977
T. G. Barnes, J. F. Dominy, D. S. Evans, P. W. Kelton, S. B. Parsons, R. J. Stover   +5 more
openaire   +1 more source

On Cepheid Distances in the $${H}_{0}$$ Measurement

Comment: 20 pages plus references. Finalized in early October 2023. To appear as a chapter in the Book "The Hubble Constant Tension", edited by E. Di Valentino and D.
openaire   +2 more sources

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