Luminosity and Photometry
نویسندگان
چکیده
منابع مشابه
The luminosity calibration of the uvby − β photometry
The luminosity calibration of the uvby − β photometry Abstract. The ESA HIPPARCOS satellite has provided astrometry of unprecedented accuracy, allowing to reassess, improve and refine the pre-HIPPARCOS luminosity calibrations. We review the " classical " absolute magnitude calibrations with the Strömgren-Crawford intermediate-band photometric system. A small zero point correction of about 2-4% ...
متن کاملJHKL Photometry and the K−band Luminosity Function at the Galactic Center
J , H , K, and L photometry for the stars in the central ∼ 2 (∼ 5 pc) of the Galaxy are presented. Using the observed J − H , H −K, and K − L colors and assumed intrinsic colors, we determine the interstellar extinction at 2.2 μm (AK) for approximately 1100 individual stars. The mean AK (= 3.3 mag) is similar to previous results, but we find that the reddening is highly variable and some stars ...
متن کاملConjugateplane photometry: reducing scintillation in groundbased photometry
High-precision fast photometry from ground-based observatories is a challenge due to intensity fluctuations (scintillation) produced by the Earth’s atmosphere. Here we describe a method to reduce the effects of scintillation by a combination of pupil reconjugation and calibration using a comparison star. Because scintillation is produced by high-altitude turbulence, the range of angles over whi...
متن کاملLuminosity * †
where v+(v−) is the common velocity of all the particles in bunch +(−). Eq. (1) is a relativistic invariant, has dimensions of 1/area, and is valid for arbitrary velocities v±. (Generalization to the case when the velocity distributions are not homogeneous is given in Ref. 2.) For a storage ring collider with bunch spacing sB , bunches collide periodically with frequency fc = βc/sB . For a line...
متن کاملEvolution of Galaxy Luminosity Function and Luminosity Function by Density
Using galaxy sample observed by the BATC large-field multi-color sky survey and galaxy data of SDSS in the overlapped fields, we study the dependence of the restframe r-band galaxy luminosity function on redshift and on large-scale environment. The large-scale environment is defined by isodensity contour with density contrast δρ/ρ. The data set is a composite sample of 69,671 galaxies with reds...
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ژورنال
عنوان ژورنال: The Journal of Physiology
سال: 1897
ISSN: 0022-3751
DOI: 10.1113/jphysiol.1897.sp000647