Results 151 to 160 of about 5,135 (186)

On the Pulsation Amplitude of Cepheid Variables

Astrophysics and Space Science, 1972
On the basis of more abundant data a relation logPΔV/logΔR for cepheid variables (Fernie, 1965) is constructed. A linear relation between logP ΔV and logΔR for classical cepheids is found, which perhaps has a break at ΔR=10R ⊙. On the logΔR/logP diagram thes-cepheids (Efremov, 1968) show a distinct sequence.
N. Nikolov, Ts. Tsvetkov
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Cepheid Variables in the Antennae

AIP Conference Proceedings, 2009
An accurate measurement of the Hubble constant provides important constraints on the equation of state of dark energy. Currently, the most robust determination of H0 is based on Cepheid distances to nearby type Ia supernovae. The occurrence of SN 2007sr in the Antennae (NGC 4038/39) provides an important additional calibrator for this method since this
Joy M. Chavez, Lucas M. Macri, Adam G. Riess, Anne Pellerin, Joyce Ann Guzik, Paul A. Bradley   +5 more
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Secondary Bumps in Cepheid Variables

Publications of the Astronomical Society of Australia, 1971
The Hertzsprung phenomenon, in which secondary bumps in the light or velocity curves of cepheid variables occur at systematically earlier phases as the period lengthens, has been known for about 50 years. As part of his programme on non-linear computations of cepheid models, Christie has interpreted the effect as a progressive wave which originates ...
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A Distant Cepheid Variable in Centaurus

Publications of the Astronomical Society of the Pacific, 1973
Observations of variable stars near = 295 , b = 0 are described, including a new cepheid for which the distance is estimated to be 11.8 kpc.
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BVRIJHK Photometry of Cepheid Variables

Publications of the Astronomical Society of the Pacific, 1997
Contemporaneous BVRI and JHK photometry are presented for twenty-two Cepheid variables. Nineteen of these variables also have uvby photometry available, making them excellent candidates for application of the Infrared Flux Method of distance determination. We are in the process of acquiring high precision radial velocities of sixteen of these variables
T. G., III Barnes, J. A. Fernley, M. L. Frueh, J. G. Navas, T. J. Moffett, I. Skillen   +5 more
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Cepheid Variables and the Magellanic Clouds

1971
Because the Magellanic Clouds provide a large number of variables at approximately the same distance and with little differential reddening, they provide a unique laboratory for the study of cepheid variability. Much more systematic observation of the variables will be necessary to fully exploit the possibilities they provide.
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Maintenance of the Pulsation in Cepheid Variables

Nature, 1937
THE oscillations induced in the principal modes of vibration of a star by a free oscillation in one of them, generally of the second order in the corresponding free amplitude, are unimportant unless magnified by resonance ; so seems the evidence from Miss H. A. Kluyver's analysis1.
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Distance Determination with Cepheid Variables

1999
Cepheid variables have long formed the backbone of the extra-galactic distance scale. The HST has greatly increased the range of Cepheid studies, making many more galaxies available for calibrating secondary distance indicators. This makes the calibration of the Cepheid period-luminosity relations, and investigations of systematic uncertainties, of ...
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Diagnostic Accuracy of the Cepheid 3-gene Host Response Fingerstick Blood Test in a Prospective, Multi-site Study: Interim Results

Clinical Infectious Diseases, 2022
Jane A Shaw, Bronwyn Smith, Joseph Mendy   +2 more
exaly  

Cepheids and Other Variable Types

2018
Variable stars may have been known since antiquity, but one particular type of star is all important in the multiplicity of applications to our understanding of the universe. How and why some stars vary is a study that was essentially started by the Cepheid variable stars, a group of objects bunched under the name of their progenitor, δ in the northern
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