Results 11 to 20 of about 12,062 (300)

Cepheids as distance indicators and stellar tracers [PDF]

Astronomy and Astrophysics Review
We review the phenomenology of classical Cepheids (CCs), Anomalous Cepheids (ACs) and type II Cepheids (TIICs) in the Milky Way (MW) and in the Magellanic Clouds (MCs). We also examine the Hertzsprung progression in different stellar systems by using the
G Bono, V F Braga, A Pietrinferni
exaly   +5 more sources

Stellar twins determine the distance of the Pleiades [PDF]

Astronomy & Astrophysics, 2016
International audienceSince the release of the Hipparcos catalog in 1997, the distance to the Pleiades open cluster has been heavily debated. The distance obtained from Hipparcos and those by alternative methods differ by 10 to 15 %.
Keith Hawkins, C. Clare Worley, Hawkins, Keith,, Gerard Gilmore, Andrew R. Casey, Gilmore, Gerard,, Caroline Soubiran, Casey, Andrew R.,, Sergi Blanco-Cuaresma, Jofré, Paula,, Soubiran, C., Blanco-Cuaresma, S., Mädler, Thomas,, Worley, C. Clare,, Thomas Mädler, Paula Jofré   +15 more
core   +4 more sources

The stellar content and distance of UGC 4483 [PDF]

Monthly Notices of the Royal Astronomical Society, 2001
We present HST/WFPC2 observations of UGC 4483, an irregular galaxy in the M81/NGC 2403 complex. Stellar photometry was carried out with HSTphot, and is complete to V ~ 26.0 and I ~ 24.7. We measure the red giant branch tip at I = 23.56 +/- 0.10 and calculated a distance modulus of (m-M)o = 27.53 +/- 0.12 (corresponding to a distance of 3.2 +/- 0.2 Mpc),
L Makarova, I D Karachentsev, V E Karachentseva   +2 more
exaly   +4 more sources

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   +2 more sources

Stellar Distance and Velocity

Journal of Applied Mathematics and Physics, 2019
In this paper, a method is presented by which it is possible to determine a distance between the sun and a star as well as a velocity at which the star moves relative to the sun. In order to achieve this, it is sufficient to know three positions of the star and the unit vectors determined by the star and three arbitrarily chosen points that do not lie ...
Miloš Čojanović
exaly   +3 more sources

Statistical exponential distribution function as distance indicator to stellar groups

NRIAG Journal of Astronomy and Geophysics, 2012
In this paper, statistical distribution functions are developed for distance determination of stellar groups. This method depends on the assumption that, absolute magnitudes and apparent magnitudes follow an exponential distribution function.
Issa, I.A., Abdel Rahman, H., Sabry, M.A.   +2 more
exaly   +2 more sources

The Enigmatic (Almost) Dark Galaxy Coma P: Distance Measurement and Stellar Populations from HST Imaging* [PDF]

Astronomical Journal, 2019
We present Hubble Space Telescope (HST) observations of the low surface brightness (SB) galaxy Coma P. This system was first discovered in the Arecibo Legacy Fast ALFA H i survey and was cataloged as an (almost) dark galaxy because it did not exhibit any
Samantha W Brunker, Kristen B W Mcquinn, John J Salzer   +2 more
exaly   +3 more sources

DREAM-Stellar: parallel and space efficient exact local alignment [PDF]

BMC Bioinformatics
Background Searching large genomic data sets for local alignments poses a computational challenge. A particular obstacle is the handling of repetitive sequences that appear in various contexts and incur a high runtime cost. For practical homology search,
Evelin Aasna, Simon Gene Gottlieb, Marcel Ehrhardt, Knut Reinert   +3 more
doaj   +2 more sources

The distance of M 33 and the stellar population in its outskirts [PDF]

Astronomy and Astrophysics, 2004
We present deep V,I photometry of two $9.4' x 9.4' field in the outer regions of the M33 galaxy. We obtain a robust detection of the luminosity of the Red Giant Branch Tip (I{TRGB}=20.72 +- 0.08) from which we derived a new estimate of the distance modulus of M33, (m-M)_0=24.64 +- 0.15, corresponding to a distance D=847 +- 60 Kpc.
S Galleti, M Bellazzini, F R Ferraro
exaly   +4 more sources

Distance determination for RAVE stars using stellar models [PDF]

Astronomy and Astrophysics, 2010
The RAdial Velocity Experiment (RAVE) is a spectroscopic survey of the Milky Way which already collected over 400000 spectra of ∼330000 different stars.
T Zwitter, G Matijevic, U Munari
exaly   +3 more sources