搜索结果: 1-15 共查到“天体物理学 variations”相关记录16条 . 查询时间(0.203 秒)
Future constraints on variations of the fine structure constant from combined CMB and weak lensing measurements
Future constraints variations fine structure constant combined CMB weak lensing measurements
2012/2/21
We forecast the ability of future CMB and galaxy lensing surveys to constrain variations of the fine structure constant. We found that lensing data, as those expected from satellite experiments as Euc...
Large Variations of the coefficient $J_2$ of geopotential, and the dynamical Love number $k_2^d$ from the analysis of laser ranging to LAGEOS~1 and LAGEOS~2
Earth’s satellites geopotential tides Love numbers
2011/8/24
Secular and seasonal variations of the coefficient $J_2$ of the geopotential are studied from the analysis of laser measurements of distances to the geodetic satellites LAGEOS~1 (1988--2003) and LAGEO...
A Model for Thermal Phase Variations of Circular and Eccentric Exoplanets
methods data analysis planetary systems
2010/11/9
We present a semi-analytic model atmosphere for close-in exoplanets that captures the essential
physics of phase curves: orbital and viewing geometry, advection, and re-radiation. We calibrate the mo...
Search for Keplerian periods in light variations of T Tauri stars and Herbig Ae stars
Keplerian periods T Tauri stars Herbig Ae stars
2010/11/15
Long-term, uniform series of UBVR observations of T Tauri and Herbig Ae stars obtained
over 20 yr at the Maidanak Observatory as part of the ROTOR program are analyzed. We find
a linear relationship...
Quantifying the challenges of detecting unseen planetary companions with transit timing variations
celestial mechanics methods n-body simulations statistical stars planetary systems
2010/11/11
Both ground and space-based transit observatories are poised to signi cantly increase the number of known transiting planets and the number of precisely measured transit times.
Extreme Climate Variations from Milankovitch-like Eccentricity Oscillations in Extrasolar Planetary Systems
Earth and Planetary Astrophysics (astro-ph.EP)
2010/12/28
Although our solar system features predominantly circular orbits, the exoplanets discovered so far indicate that this is the exception rather than the rule.
Stellar Population Variations in the Milky Way's Stellar Halo
Cosmology and Extragalactic Astrophysics (astro-ph.CO) Galaxy Astrophysics (astro-ph.GA)
2010/12/29
If the stellar halos of disk galaxies are built up from the disruption of dwarf galaxies, models predict highly structured variations in the stellar populations within these halos.
Amplitude variations of the CoRoT Be star 102719279
Solar and Stellar Astrophysics (astro-ph.SR)
2010/12/28
The Be star 102719279 is an interesting target observed with CoRoT during two runs, giving us the possibility to study the stability of the detected frequencies and to search for any correlation with ...
Variations in the axisymmetric transport of magnetic elements on the Sun: 1996-2010
Solar and Stellar Astrophysics (astro-ph.SR)
2010/12/27
We measure the axisymmetric transport of magnetic flux on the Sun by cross-correlating narrow strips of data from line-of-sight magnetograms obtained at a 96-minute cadence by the MDI instrument on th...
Transit timing variations in eccentric hierarchical triple exoplanetary systems. I. Perturbations on the time-scale of the orbital period of the perturber
Earth and Planetary Astrophysics (astro-ph.EP) Solar and Stellar Astrophysics (astro-ph.SR)
2010/12/24
We study the long-term time-scale (i.e. period comaprable to the orbital period of the outer perturber object) transit timing variations in transiting exoplanetary systems which contain a further, mor...
Variations of the amplitudes of oscillation of the Be star Achernar
Solar and Stellar Astrophysics (astro-ph.SR)
2010/12/24
We report on finding variations in amplitude of the two main oscillation frequencies found in the Be star Achernar, over a period of 5 years.
Magnetic and Velocity Field Variations in the Active Regions NOAA 10486 and NOAA 10488
Sun magnetogram—Sun Dopplergram—Sun flare
2010/9/15
We study the magnetic and velocity field evolution in the two magnetically complex active regions NOAA 10486 and NOAA 10488 observed during October–November 2003.We have used the available data to exa...
Varying couplings in the early universe: correlated variations of $\alpha$ and $G$
early universe Planck satellite mission
2010/3/19
The Cosmic Microwave Background anisotropies provide a unique opportunity to constrain simultaneous variations of the fine-structure constant $\alpha$ and Newton's gravitational constant $G$. Those co...
Calcium and light-elements abundance variations from high resolution spectroscopy in globular clusters
abundances stars evolution globular clusters general
2010/3/8
We use abundances of Ca, O, Na, Al from high resolution UVES spectra of 200 red giants in 17 globular clusters (GCs) to investigate the correlation found by Lee et al. (2009) between chemical enrichme...
Determining the masses and evolution of cvs through Ellipsoidal variations
cvs Ellipsoidal variations
2009/6/17
Determining the masses and evolution of cvs through Ellipsoidal variations。