Results 51 to 60 of about 2,384 (215)

Calibration of the Cepheid Distance Scale [PDF]

International Astronomical Union Colloquium, 1993
AbstractThe absolute calibration of the Cepheid period-luminosity (PL) relation with galactic Cepheids is discussed. Various methods, most importantly the cluster ZAMS-fitting scale and the Baade-Wesselink scale are found to yield PL zero points which agree within ∼ ± 0.1 mag. The present Cepheid calibration sets the Large Magellanic Cloud at μ0 (LMC) =
Wolfgang P. Gieren, Pascal Fouqué
openaire   +1 more source

Cepheid distances from the Baade–Wesselink method [PDF]

Proceedings of the International Astronomical Union, 2012
AbstractRecent progress on Baade–Wesselink (BW)-type techniques to determine the distances to classical Cepheids is reviewed. Particular emphasis is placed on the near-infrared surface-brightness (IRSB) version of the BW method. Its most recent calibration is described and shown to be capable of yielding individual Cepheid distances accurate to 6 ...
Gieren, Wolfgang, Storm, Jesper, Nardetto, Nicolas, Gallenne, Alexandre, Pietrzyński, Grzegorz, Fouqué, Pascal, Barnes, Thomas G., Majaess, Daniel   +7 more
openaire   +2 more sources

Mapping the HPV Detection Landscape in Botswana: A Narrative Review of Diagnostic Platforms and Their Impact on Cervical Cancer Control

Health Science Reports, Volume 9, Issue 3, March 2026.
ABSTRACT Background and Aim Cervical cancer is a major public health issue in Botswana, driven by high HIV prevalence and limited screening access. Molecular detection of high‐risk human papillomavirus (hrHPV) is crucial for prevention and early diagnosis.
Leabaneng Tawe
wiley   +1 more source

MOND rotation curves for spiral galaxies with Cepheid-based distances

, 2002
Rotation curves for four spiral galaxies with recently determined Cepheid-based distances are reconsidered in terms of modified Newtonian dynamics (MOND). For two of the objects, NGC 2403 and NGC 7331, the rotation curves predicted by MOND are compatible
Sanders, RH, Rothberg, B, R. H. Sanders, B. Rothberg, J. L. G. Pestaña, Pestana, JLG, R. Bottema, Bottema, R   +7 more
core   +1 more source

A Cepheid Distance to the Fornax Cluster

, 1998
The Hubble Space Telescope is being used to measure accurate Cepheid distances to nearby galaxies with the ultimate aim of determining the Hubble constant, H_0. For the first time, it has become feasible to use Cepheid variables to derive a distance to a galaxy in the southern hemisphere cluster of Fornax.
Madore, B. F., Freedman, W. L., Silbermann, N., Harding, P., Huchra, J., Mould, J. R., Graham, J. A., Ferrerase, L., Gibson, B. K., Han, M., Hoessel, J. G., Hughes, S. M., Illingworth, G. D., Phelps, R., Sakai, S., Stetson, P.   +15 more
openaire   +2 more sources

Factors Associated With Opioid Agonist Treatment Engagement and Harm Reduction Service Use: Findings From the New South Wales Opioid Dependence Survey

Drug and Alcohol Review, Volume 45, Issue 3, March 2026.
ABSTRACT Introduction Opioid agonist treatment (OAT) is one of the most effective treatments for opioid dependence, but there can be barriers to accessing treatment. This study examined characteristics associated with OAT engagement—never, previous or current—among people with opioid dependence in NSW, Australia, following recent reforms to OAT access.
Thomas Santo Jr, Chrianna Bharat, Craig Rodgers, Mary Harrod, Sophia Taylor, Emma Zahra, Rachel Sutherland, Amy Peacock, Jason Grebely, Matthew Hickman, Michael Farrell, Louisa Degenhardt   +11 more
wiley   +1 more source

Cepheid-based Distances to NGC 4303 and NGC 1068

The Astrophysical Journal
We present Cepheid-based distances to two canonical active galactic nuclei: NGC 4303 (M61) and NGC 1068. Data were obtained using the Hubble Space Telescope with nonredundant time spacing over 12 visits for each target, and observations were made with ...
Madison Markham, Misty C. Bentz, Laura Ferrarese, Christopher A. Onken, Marianne Vestergaard   +4 more
doaj   +1 more source

RR Lyrae and Type II Cepheid Variables in Globular Clusters: Optical and Infrared Properties

Universe, 2022
Globular clusters are both primary fossils of galactic evolution and formation and are ideal laboratories for constraining the evolution of low-mass and metal-poor stars.
Anupam Bhardwaj
doaj   +1 more source

The Cepheid Distance to NGC 4414 [PDF]

International Astronomical Union Colloquium, 2000
AbstractA search for Cepheids in NGC 4414 has been performed using HST archive data. Accurate photometry for this galaxy is challenging due to its high surface brightness background with steep gradients and the rather low S/N of stellar point sources.
openaire   +1 more source

HipparcosParallaxes and the Cepheid Distance Scale [PDF]

The Astrophysical Journal, 1998
15 pages, 4 figures, Ap. J.
Madore, Barry F., Freedman, Wendy L.
openaire   +2 more sources