Results 31 to 40 of about 2,384 (215)
How rotation affects masses and ages of classical Cepheids
EPJ Web of Conferences, 2017 Classical Cepheid variable stars are both sensitive astrophysical laboratories and accurate cosmic distance tracers. We have recently investigated how the evolutionary effects of rotation impact the properties of these important stars and here provide an
Anderson Richard I. +4 more
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Evidence for the extragalactic Cepheid distance bias from the kinematical distance scale
, 2002 We present new evidence for the extragalactic Cepheid distance bias. A dependence between the Hubble parameter and the absolute Cepheid magnitude limit for a galaxy may be interpreted as a significant bias in the derived photometric distances: those ...
P. Teerikorpi, G. Paturel
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Rotation and the Cepheid Mass Discrepancy [PDF]
, 2015 We recently showed that rotation significantly affects most observable Cepheid quantities, and that rotation, in combination with the evolutionary status of the star, can resolve the long-standing Cepheid mass discrepancy problem.
core +1 more source
Odessa Astronomical Publications, 2019 We present the results of a spectro- scopic and photometric investigation of 20 objects from the open cluster Collinder 394, which contains the Cepheid BB Sgr.
I. A. Usenko +6 more
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The Astrophysical Journal, 2023 We compare infrared surface brightness fluctuation (IR SBF) distances measured in galaxies that have hosted type Ia supernovae (SNe Ia) to distances estimated from SNe Ia light-curve fits.
Peter Garnavich +8 more
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The Astrophysical JournalWe examine the multiwavelength period–luminosity–color (PLC) relations for Cepheid variables in the Large and Small Magellanic Clouds and the Milky Way.
Barry F. Madore, Wendy L. Freedman
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The Astrophysical JournalThe period–luminosity (PL) relation is usually derived using time-averaged magnitudes, which require multiple-epoch observations to determine periods and adequately sample the light curves.
Mahdi Abdollahi +4 more
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The Cepheid Extragalactic Distance Scale: Past, Present and Future [PDF]
Cepheids have been the cornerstone of the extragalactic distance scale for a century. With high-quality data, these luminous supergiants exhibit a small dispersion in their Leavitt (period–luminosity) relation, particularly at longer wavelengths, and few
Madore, Barry F., Freedman, Wendy L.
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THE EXTRAGALACTIC DISTANCE SCALE WITHOUT CEPHEIDS. III. [PDF]
The Astrophysical Journal, 2008 Distances of galaxies in the Hubble Space Telescope Key Project are based on the Cepheid period-luminosity relation. An alternative basis is the tip of the red giant branch. Using archival HST data, we calibrate the infrared Tully-Fisher relation using 14 galaxies with tip of the red giant branch measurements.
Mould, Jeremy, Sakai, Shoko
openaire +5 more sources
Journal of Viral Hepatitis, Volume 33, Issue 6, June 2026.ABSTRACT Ongoing monitoring of hepatitis C virus (HCV) and HIV incidence among people who inject drugs (PWID) is important for epidemic control and assessing progress towards disease elimination. We estimated trends in HIV and HCV infection incidence in a community‐based cohort of PWID in Montreal, Canada.
Bluma Blake Kleiner +9 more
wiley +1 more source