نتایج جستجو برای: star catalogue
تعداد نتایج: 88057 فیلتر نتایج به سال:
Using population synthesis tools we create a synthetic Kepler Input Catalogue (KIC) and subject it to the Kepler Stellar Classification Program (SCP) method for determining stellar parameters such as the effective temperature Teff and surface gravity g. We achieve a satisfactory match between the synthetic KIC and the real KIC in the log g versus log Teff diagram, while there is a significant d...
Variable stars have been an incredibly important discovery since the early days of astronomy. Certain types of variable stars, such as Cepheids, can give not only great insight into the inner dynamics of stars, but also essential parameters of the star, such as luminosity, mass, and the distance from the observer. The number of discovered variable stars has risen dramatically over time, and sev...
دل استاندارد ذرات بنیادی به عنوان مدلی برای توصیف برهم کنش بین ذرات بنیادی، برخلاف موفقیت های فراوان مدل کاملی برای ذرات بنیادی نیست. بنابراین فیزیک پیشگان به دنبال مدلی فراسوی مدل استاندارد هستند که یکی از این مدل ها، نظریه میدان در فضای ناجابجایی است. برای نوشتن مدل استاندارد در فضای ناجابجایی دو رهیافت پیشنهاد شده است. در رهیافت اول گروه تقارنی را $u_{star}(3) imes u_{star}(2) imes u_{star...
We report the discovery of only the fourth massive WO star to be found in the Milky Way, and only the seventh identified within the Local Group. This has resulted from the first observations made in a programme of follow-up spectroscopy of candidate emission line stars from the AAO/UK Schmidt Southern Galactic Plane Hα Survey. The optical spectrum of this star, to become WR 93b in the Catalogue...
We are conducting a large program to classify newly discovered Milky Way star cluster candidates from the list of Froebrich, Scholz & Raftery (2007b). Here we present deep NIR follow-up observations from ESO/NTT of 14 star cluster candidates. We show that the combined analysis of star density maps and colour-colour/magnitude diagrams derived from deep near-infrared imaging is a viable tool to r...
Using population synthesis tools we create a synthetic Kepler Input Catalogue (KIC) and subject it to the Kepler Stellar Classification Program (SCP) method for determining stellar parameters such as the effective temperature Teff and surface gravity g. We achieve a satisfactory match between the synthetic KIC and the real KIC in the log g versus log Teff diagram, while there is a significant d...
We use high-resolution Hubble Space Telescope imaging observations of the young (∼ 15 − 25 Myr) star cluster NGC 1818 in the Large Magellanic Cloud to derive an estimate for the binary fraction of F stars (1.3 < M⋆/M⊙ < 1.6). This study provides the strongest constraints yet on the binary fraction in a young star cluster in a low-metallicity environment ([Fe/H] ∼ −0.4). Employing artificial sta...
We use the science demonstration field data of the Herschel Astrophysical Terahertz Large Area Survey to study how star formation, traced by the far-infrared Herschel data, is related to both the accretion luminosity and redshift of quasars selected from the Sloan Digital Sky Survey (SDSS) and the 2dF-SDSS luminous red galaxy (LRG) and Quasar Spectroscopic Catalogue survey. By developing a maxi...
We present the near-IR (K′-band, i.e.: λ = 2.1 μm) Tully-Fisher (TF) relation for a sample of 50 giant and dwarf late-type galaxies, selected from the Virgo Cluster Catalogue. We find that L ∝ V 4 Max along a range of 8 K′-mag for galaxies with different Hubble types (from Sa to Im-BCD), phenomenologies, structures, star-formation histories, masses, dark-to-luminous mass ratios, metallicities a...
With a peak luminosity of ∼ 1047 erg s−1, the December 27th 2004 giant flare from SGR1806-20 would have been visible by BATSE (the Burst and Transient Source Experiment) out to ≈ 50 Mpc[1, 2]. It is thus plausible that some fraction of the short duration Gamma-Ray Bursts (sGRBs) in the BATSE catalogue were due to extragalactic magnetar giant flares. According to the most widely accepted current...
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