Results 71 to 80 of about 10,963 (195)

On the Age Distribution of Classical Cepheids in the Galaxy

Astronomische Nachrichten, Volume 346, Issue 5, June 2025.
ABSTRACT We revisit the problem of the positive correlation between age and Galactocentric distance seen in Galactic Classical Cepheids, which at first sight may seem counter‐intuitive in the context of inside‐out galaxy formation. To explain it, we use the Besançon Galaxy Model and a simulation of star particles in the Galactic disc coupled with ...
Friedrich Anders, Chloé Padois, Marc Vilanova Sar, Marcin Semczuk, Marc del Alcázar‐Julià, Francesca Figueras   +5 more
wiley   +1 more source

Chicago–Carnegie Hubble Program: A Multiwavelength Search for the Effects of Metallicity on the Cepheid Distance Scale. I. Empirical Evidence

The Astrophysical Journal
Understanding the effects of metallicity on the multiwavelength properties of Cepheids is of continuing importance for their effective use as extragalactic distance indicators and an accurate measure of the Hubble constant, H _0 .
Barry F. Madore, Wendy L. Freedman
doaj   +1 more source

I-band Cepheid Distance to WLM [PDF]

International Astronomical Union Colloquium, 1993
WLM (DD0221) is a highly resolved dwarf irregular galaxy in the Local Group. Fifteen Cepheids in this galaxy have been studied by Sandage & Carlson (1985, AJ, 90, 1464) using photographic photometry. We have obtained BVRI CCD photometry of stars in the central area (2.2' x 3.5') of WLM.
Myung Gyoon Lee, Wendy L. Freedman, Barry F. Madore   +2 more
openaire   +1 more source

Tumor burden and heterogenous treatment effect of apalutamide in metastatic castration‐sensitive prostate cancer

Cancer, Volume 131, Issue 7, 1 April 2025.
Abstract Background Investigation remains incomplete regarding potential variations in the effect of androgen receptor pathway inhibitors, including apalutamide, based on baseline tumor burden in patients with metastatic castration‐sensitive prostate cancer (mCSPC).
Wataru Fukuokaya, Keiichiro Mori, Takafumi Yanagisawa, Fumihiko Urabe, Pawel Rajwa, Alberto Briganti, Shahrokh F. Shariat, Nobuaki Matsubara, Takahiro Kimura, Akihiro Hirakawa   +9 more
wiley   +1 more source

JWST Observations Reject Unrecognized Crowding of Cepheid Photometry as an Explanation for the Hubble Tension at 8σ Confidence

The Astrophysical Journal Letters
We present high-definition observations with the James Webb Space Telescope (JWST) of >1000 Cepheids in a geometric anchor of the distance ladder, NGC 4258, and in five hosts of eight Type Ia supernovae, a far greater sample than previous studies with ...
Adam G. Riess, Gagandeep S. Anand, Wenlong Yuan, Stefano Casertano, Andrew Dolphin, Lucas M. Macri, Louise Breuval, Dan Scolnic, Marshall Perrin, Richard I. Anderson   +9 more
doaj   +1 more source

Cepheid distances from infrared long-baseline interferometry [PDF]

Astronomy & Astrophysics, 2004
16 pages, 12 figures, accepted for publication in Astronomy & ...
Mourard, D., Nardetto, N., Bersier, D., Kervella, P., Mourard, D., Kervella, P., Bersier, D., Coudé Du Foresto, V., Coudé Du Foresto, V., Mourard, D., Bersier, D., Nardetto, N., Kervella, P., Foresto, V., Nardetto, N., Du Foresto, V.   +15 more
openaire   +2 more sources

Multiplicity of Galactic Cepheids from long-baseline interferometry I. CHARA/MIRC detection of the companion of V1334 Cygni [PDF]

, 2013
We aim at determining the masses of Cepheids in binary systems, as well as their geometric distances and the flux contribution of the companions. The combination of interferometry with spectroscopy will offer a unique and independent estimate of the ...
Baron, F., Brummelaar, T. ten, Che, X., Farrington, C., Gallenne, A., Gieren, W., Kervella, P., Kraus, S., McAlister, H., Monnier, J. D., Mérand, A., Pedretti, E., Pietrzynski, G., Schaefer, G. H., Sturmann, J., Sturmann, L., Szabados, L., Turner, N., Vargas, N.   +18 more
core   +4 more sources

The Cepheid Distance Scale: A Novel Method for Obtaining Mean Magnitudes from Single-epoch Observations

The Astronomical Journal
We present a novel technique for mapping single-phase observations of Cepheids in any given band into their time-averaged values, using strong priors on the known interrelations of the multiwavelength widths of Cepheid period–luminosity (PL) relations ...
Barry F. Madore, Wendy L. Freedman, Kayla Owens   +2 more
doaj   +1 more source

PULSATIONAL AND ORBITAL PERIODS OF SMALL-AMPLITUDE CEPHEID SU CAS

Odessa Astronomical Publications, 2007
New seven high-resolutional spectra of small-amplitude Cepheid SU Cas have been obtained to determine its atmosphere parameters (Teff=6384 K; log g=2.4; Vt=3.3 km s-1) and to measure its radial velocities.
I. A. Usenko, V. G. Klochkova, N. S. Tavolzhanskaya   +2 more
doaj   +1 more source

High resolution spectroscopy for Cepheids distance determination [PDF]

Astronomy & Astrophysics, 2006
The ratio of pulsation to radial velocity (the projection factor) is currently limiting the accuracy of the interferometric Baade-Wesselink method. This work aims at establishing a link between the line asymmetry evolution over the Cepheids' pulsation cycles and their projection factor, with the final objective to improve the accuracy of the Baade ...
Nardetto, N., Mourard, D., Kervella, P., Mathias, Ph., Merand, A., Bersier, D.   +5 more
openaire   +3 more sources