Results 11 to 20 of about 368,263 (301)
Variation of the fine-structure constant: an update of statistical analyses with recent data [PDF]
Astronomy & Astrophysics, Volume 557, id.A36, 9 pp., September
2013, 2013 We analyze the consistency of different astronomical data of the variation in the fine-structure constant obtained with KECK and VLT. We tested the consistency using the Student test and confidence intervals.
Kraiselburd, Lucila +2 more
core +5 more sources
The stability of the optical flux variation gradient for 3C120 [PDF]
A&A 581, A93 (2015), 2015 New $B$- and $V$-band monitoring in 2014 $-$ 2015 reveals that the Seyfert 1 Galaxy, 3C120, has brightened by a magnitude of $1.4$, compared to our campaign that took place in 2009 $-$ 2010.
Chini, Rolf +4 more
core +2 more sources
Detection of an exoplanet around the evolved K giant HD 66141 [PDF]
, 2012 Aims. We have been carrying out a precise radial velocity (RV) survey for K giants to search for and study the origin of the lowamplitude and long-periodic RV variations. Methods. We present high-resolution RV measurements of the K2 giant HD 66141 from
Han, I. +4 more
core +2 more sources
Treatment planning with a 2.5 MV photon beam for radiation therapy
Journal of Applied Clinical Medical Physics, Volume 23, Issue 12, December 2022., 2022 Abstract Purpose The shallow depth of maximum dose and higher dose fall‐off gradient of a 2.5 MV beam along the central axis that is available for imaging on linear accelerators is investigated for treatment of shallow tumors and sparing the organs at risk (OARs) beyond it.
Navid Khaledi +5 more
wiley +1 more source
Signals embedded in the radial velocity noise [PDF]
Astronomy & Astrophysics, 2013 The abilities of radial velocity exoplanet surveys to detect the lowest-mass extra-solar planets are currently limited by a combination of instrument precision, lack of data, and "jitter". Jitter is a general term for any unknown features in the noise, and reflects a lack of detailed knowledge of stellar physics (asteroseismology, starspots, magnetic ...
D. J. Pinfield +15 more
openaire +6 more sources
Conceptual Design of the NISS onboard NEXTSat-1 [PDF]
Journal of Astronomy and Space Sciences, 2014 The NISS onboard NEXTSat-1 is being developed by Korea astronomy and space science institute (KASI). For the study of the cosmic star formation history, the NISS performs the imaging spectroscopic observation in the near-infrared range for nearby ...
Woong-Seob Jeong +17 more
doaj +1 more source
Period Change of the Contact Binary AH Tauri [PDF]
Journal of Astronomy and Space Sciences, 2004 New BVRI photometric observations of the contact binary AH Tau were performed with the 61 cm reflector and a 2K CCD camera at the Sobaeksan Optical Astronomy Observatory during seven nights from September to December, 2001. A total of 144 times of minima
Dongjoo Lee +5 more
doaj +1 more source
PERIODIC AND SPORADIC VARIATIONS IN THE SPECTRAL FLUX DENSITY OF THE CAS A SUPERNOVA REMNANT [PDF]
Radio Physics and Radio Astronomy, 2020 Purpose: Based on the long-term study data in all radio spectrum ranges, the nature of deviations of spectral flux density of the Cas A supernova remnant from the tendency of its secular decrease is considered.
A. A. Gorbunov +3 more
doaj +1 more source
Observation of coronal loop torsional oscillation [PDF]
, 2003 We suggest that the global torsional oscillation of solar coronal loop may be observed by the periodical variation of a spectral line width. The amplitude of the variation must be maximal at the velocity antinodes and minimal at the nodes of the ...
Zaqarashvili, T. V.
core +3 more sources
Low-resolution spectroscopy of main sequence stars belonging to 12 Galactic globular clusters [PDF]
Astronomy & Astrophysics, 2010 Globular clusters show abundance variations for light elements that are not yet well understood. The preferred explanation involves a self-enrichment scenario, with two subsequent generations of stars. Observations of main sequence stars allow us to investigate the signature of this chemically processed material without the complicating effects of ...
Ricardo Carrera +4 more
openaire +6 more sources