Results 91 to 100 of about 11,049 (214)
NEW ASPECT OF SMALL-AMPLITUDE CEPHEID SU CAS
Odessa Astronomical Publications, 2008 New 17 high-resolutional spectra of small-amplitude Cepheid SU Cas have been obtained to determine its atmosphere parameters (Teff=6353 K; log g=2.38; Vt=3.25 km s -1 and to measure its radial velocities.
I. A. Usenko +2 more
doaj +1 more source
EPJ Web of Conferences, 2017 We present a distance determination to the Small Magellanic Cloud (SMC) using optical and near-infrared photometry from OGLE and IRSF. Applying a multiband method to V, I, J, H and K OGLE and IRSF data, we measured the SMC true distance modulus and mean ...
Wielgorski Piotr +2 more
doaj +1 more source
Cepheids as Distance Indicators: Some Current Problems
Odessa Astronomical Publications, 2001 A general review is given of the calibration of the Cepheid distance scale, with particular reference to its use in the determination of H0. Emphasis is placed on the advantage of using a galactic calibration of the Cepheid scale, rather than relying on an adopted distance to the LMC. It is then possible to use LMC data to test for possible metallicity
openaire +3 more sources
THE CEPHEID DISTANCE TO NGC 0247
The Astrophysical Journal, 2009 We report VRI CCD observations of nine Cepheids in the South Polar (Sculptor) Group spiral galaxy NGC 0247. Periods of these Cepheids range from 20 to 70 days. Over the past 20 years, the brightest Cepheid in our sample, NGC 0247:[MF09] C1, has decreased its period by 6%, faded by 0.8 mag in the V band, and become bluer by 0.23 mag in (V–I).
Barry F. Madore +3 more
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Drug and Alcohol Review, Volume 43, Issue 7, Page 2077-2088, November 2024.Abstract Introduction Limited data exists on psychological impacts of the COVID‐19 pandemic among people who use drugs (PWUD). This study aimed to determine the prevalence and correlates of severe psychological distress (PD) among PWUD in Montreal around the beginning of the pandemic.
Iuliia Makarenko +7 more
wiley +1 more source
Calibrating the Cepheid distance scalewith Gaia
, 2021 Cepheid stars play a considerable role as astronomical distances indicators thanks to the empirical relation between their pulsation period and intrinsic luminosity: the PL relation. The uncertainty on this relation is the largest contributor to the error budget of the Hubble constant, that describes the Universe's expansion.
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APMIS, Volume 132, Issue 9, Page 657-662, September 2024.An observational and retrospective study was carried out to analyse HCoV positivity from a multiplex PCR respiratory panel and RT‐PCR for SARS‐CoV‐2 in respiratory samples from 1 June 2020 to 31 July 2023 at the Príncipe de Asturias University Hospital (HUPA) in Alcalá de Henares, Madrid, Spain.
Rojo‐Marcos Gerardo +4 more
wiley +1 more source
Prospects for X-Ray and FUV Observations to Provide Insight Into the “Cepheid Mass Problem”
Frontiers in Astronomy and Space Sciences, 2019 The classical Cepheid Leavitt Law (Period-Luminosity relation) has been known for 100 years, and used in extragalactic distance determination for nearly as long.
Nancy Remage Evans, Scott Engle
doaj +1 more source
, 2004 In a previous paper, we reported on the discovery of more than a hundred new Cepheid variables in the Sculptor Group spiral NGC 300 from wide-field images taken in the B and V photometric bands at ESO/La Silla.
Alistair Walker +17 more
core +3 more sources
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.
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