Results 121 to 130 of about 10,963 (195)
The Cepheid Distance Scale after Hipparcos
, 1998 More than two hundred classical cepheids were measured by the Hipparcos astrometric satellite, making possible a geometrical calibration of the cepheid distance scale. However, the large average distance of even the nearest cepheids measured by Hipparcos implies trigonometric parallaxes of at most a few mas.
openaire +2 more sources
Cepheid, Tully-Fisher and SNIa Distances
, 2002 We first discuss why the uncomfortable fine-tuning of the parameters of the Lambda-CDM cosmological model provides continuing, strong motivation to investigate Hubble's Constant. Then we review evidence from the HST Key Project that there is a significant scale error between raw Cepheid and Tully-Fisher distances.
Shanks, T. +3 more
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The Mira Distance to M101 and a 4% Measurement of H 0
The Astrophysical JournalThe 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 +10 more
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An independent Cepheid distance scale: Current status [PDF]
An independent distance scale for Cepheid variables is discussed. The apparent magnitude and the visual surface brightness, inferred from an appropriate color index, are used to determine the angular diameter variation of the Cepheid.
Barnes, T. G., III
core +1 more source
The Milky Way as Seen by Classical Cepheids. I. Distances Based on Mid-infrared Photometry
The Astrophysical Journal Supplement SeriesClassical 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 +5 more
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The Astrophysical Journal LettersCycle 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 +10 more
doaj +1 more source
The Orbit and Dynamical Mass of Polaris: Observations with the CHARA Array
The Astrophysical JournalThe 30 yr orbit of the Cepheid Polaris has been followed with observations by the Center for High Angular Resolution Astronomy (CHARA) Array from 2016 through 2021.
Nancy Remage Evans +21 more
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Rebuilding the Cepheid Distance Scale. I. A Global Analysis of Cepheid Mean Magnitudes
The Astrophysical Journal, 1997 54 pages, 7 figures, 4 tables, submitted to ...
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Abstract Supplement HIV Glasgow 10–13 November 2024, Glasgow, UK/Virtual
Journal of the International AIDS Society, Volume 27, Issue S6, November 2024.
wiley +1 more source
The Astrophysical JournalThe Hubble Tension, a >5 σ discrepancy between direct and indirect measurements of the Hubble constant ( H _0 ), has persisted for a decade and motivated intense scrutiny of the paths used to infer H _0 .
Siyang Li +9 more
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