Results 11 to 20 of about 228,090 (281)

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

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, John R. Barnes, B.D. Carter, James S. Jenkins, Duncan J. Wright, C. G. Tinney, Jeremy Bailey, Mikko Tuomi, Mikko Tuomi, Simon J. O'Toole, R. P. Butler, Robert A. Wittenmyer, Hugh R. A. Jones, Graeme Salter, Steven S. Vogt, Jonathan Horner   +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, Sung-Joon Park, Kwijong Park, Dae-Hee Lee, Jeonghyun Pyo, Bongkon Moon, Youngsik Park, Il-Joong Kim, Won-Kee Park, Duk-Hang Lee, Chan Park, Kyeongyeon Ko, Toshio Matsumoto, Norihide Takeyama, Akito Enokuchi, Goo-Whan Shin, Jangsoo Chae, Uk-Won Nam   +17 more
doaj   +1 more source

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, Landau, Susana J., Simeone, Claudio   +2 more
core   +4 more sources

The ISO Galactic Metallicity Gradient Revisited [PDF]

, 2002
Two independent groups (Giveon et al. 2002; Martin-Hernandez et al. 2002) have recently investigated the Galactic metallicity gradient as probed by ISO observations of mid-infrared emission lines from HII regions.
Giveon, Uriel, Morisset, Christophe, Sternberg, Amiel   +2 more
core   +2 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
doaj   +1 more source

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, Ricardo Carrera, Elena Pancino, Marina Rejkuba, Manuela Zoccali   +4 more
openaire   +7 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, C. -H. Kim, S. -L. KIM, J. -H. Youn, S. -G. Kwon   +4 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, M. I. Ryabov, A. L. Sukharev, V. V. Bezrukovs   +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