Long term changes in EUV and X-ray emissions from the solar corona and chromosphere as measured by the response of the Earth’s ionosphere during total solar eclipses from 1932 to 1999 [PDF]
Annales Geophysicae, 2001 Measurements of the ionospheric E region during total solar eclipses in the period 1932–1999 have been used to investigate the fraction of Extreme Ultra Violet and soft X-ray radiation, 8, that is emitted from the limb corona and chromosphere.
C. J. Davis +5 more
doaj +1 more source
Origin of apparent period variations in eclipsing post-common-envelope binaries [PDF]
Astronomy & Astrophysics, 2013 Apparent period variations detected in several eclipsing, close-compact binaries are frequently interpreted as being caused by circumbinary giant planets. This interpretation raises the question of the origin of the potential planets that must have either formed in the primordial circumbinary disk, together with the host binary star, and survived its ...
Zorotovic, M., Schreiber, M. R.
openaire +9 more sources
Variation of the fine-structure constant: an update of statistical analyses with recent data [PDF]
, 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 +4 more sources
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 +7 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
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The long bar as seen by the VVV Survey: II. Star counts [PDF]
, 2013 Context: There is still some debate about the presence and the morphological properties of the long bar in the inner Galaxy. Aims: We investigate the morphological properties of the long Galactic bar using the VVV survey extending star counts at least ...
Amôres, Eduardo +5 more
core +2 more sources
Roche Model and Absolute Dimensions of the Eclipsing Binary Y Cam with a Pulsating Component [PDF]
Journal of Astronomy and Space Sciences, 2002 We performed CCD photometric observations of the eclipsing binary Y Cam with a pulsating component, for 16 nights from November 2000 to May 2001 using a V filter attached to the 61-cm reflector at Sobaeksan Optical Astronomy Observatory.
J. W. Lee +4 more
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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
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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 +7 more sources
Cepstrum Analysis of Terrestrial Impact Crater Records [PDF]
Journal of Astronomy and Space Sciences, 2008 Study of terrestrial impact craters is important not only in the field of the solar system formation and evolution but also of the Galactic astronomy. The terrestrial impact cratering record recently has been examined, providing short- and intermediate ...
Heon-Young Chang, Cheongho Han
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