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Measurement of Galactic Logarithmic Spiral Arm Pitch Angle Using Two-Dimensional Fast Fourier Transform Decomposition
Galactic Logarithmic Spiral Arm Pitch Angle Two-Dimensional Fast Fourier Transform Decomposition
2012/2/21
A logarithmic spiral is a prominent feature appearing in a majority of observed galaxies. This feature has long been associated with the traditional Hubble classification scheme, but historical quotes...
The Galactic dust-to-metals ratio and metallicity using gamma-ray bursts
Gamma-ray burst: general – ISM: abundances – dust, extinction – Galaxy: abundances – X-rays: ISM
2011/7/29
The metallicity and dust-to-metals ratio of the Galaxy are fundamental parameters in understanding the ISM, but there is still uncertainty surrounding these parameters. In this paper, the dust-to-meta...
Pairwise Velocities of Dark Matter Halos: a Test for the Lambda Cold Dark Matter Model using the Bullet Cluster
method : N-body simulations — galaxies : evolution — galaxies : for-mation — galaxies: clusters — cosmology : theory — cosmology : dark matter
2011/7/26
The existence of a bullet cluster (such as 1E0657-56) poses a challenge to the concordance Lambda cold dark matter model. Here we investigate the velocity distribution of dark matter halo pairs in lar...
On using the beaming effect to measure spin-orbit alignment in stellar binaries with Sun-like components
measure spin-orbit alignment stellar binaries Sun-like components
2011/7/22
The beaming effect (aka Doppler boosting) induces a variation in the observed flux of a luminous object, following its observed radial velocity variation. We describe a photometric signal induced by t...
On the Detection of (Habitable) Super-Earths Around Low-Mass Stars Using Kepler and Transit Timing Variation Method
Planetary Systems
2011/7/14
We present the results of an extensive study of the detectability of Earth-sized planets and super-Earths in the habitable zones of cool and low-mass stars using transit timing variation method. We ha...
Using Star Spots to Measure the Spin-orbit Alignment of Transiting Planets
Using Star Spots Measure Alignment Transiting Planets
2011/7/11
Spectroscopic follow-up of dozens of transiting planets has revealed the degree of alignment between the equators of stars and the orbits of the planets they host. Here we determine a method, applicab...
Distance determination for RAVE stars using stellar models III: The nature of the RAVE survey and Milky Way chemistry
Stars: distances, Stars: fundamental parameters, Galaxy: abundances, Galaxy: disk, Galaxy: stellar content, Galaxy: structure
2011/7/6
We apply the method of Burnett & Binney (2010) for the determination of stellar distances and parameters to the internal catalogue of the Radial Velocity Experiment (Steinmetz et al. 2006). Subsamples...
Probing structure and populations of our Galaxy using the kinematics of old stars. II
Probing structure kinematics of old stars Galaxy
2009/6/30
Probing structure and populations of our Galaxy using the kinematics of old stars. II。
Probing structure and populations of our Galaxy using the kinematics of old stars. I
Probing structure kinematics of old stars Galaxy
2009/6/30
Probing structure and populations of our Galaxy using the kinematics of old stars. I。
A new RR Lyrae Survey of the Galactic Halo using QUEST Collaboration Data
Galactic Halo QUEST Collaboration Data
2009/6/26
A new RR Lyrae Survey of the Galactic Halo using QUEST Collaboration Data。
A Redetermination of the LMC Proper Motion using Four Quasar Fields
LMC Proper Motion Four Quasar Fields
2009/6/26
A Redetermination of the LMC Proper Motion using Four Quasar Fields。
Confirmation of halo substructure using quest rr lyrae data：the new virgo stellar stream (VSS)
halo substructure virgo stellar rr lyrae data
2009/6/25
Confirmation of halo substructure using quest rr lyrae data：the new virgo stellar stream (VSS)。
An empirical criterion to classify T Tauri stars and substellar analogs using low-resolution spectroscopy
T Tauri stars low-resolution spectroscopy
2009/6/18
An empirical criterion to classify T Tauri stars and substellar analogs using low-resolution spectroscopy。
Survey of stellar associations using proper motions。
Using the Seismology of Non-magnetic Chemically Peculiar Stars as a Probe of Dynamical Processes in Stellar Interiors
Variable stars diffusion
2009/5/12
Chemical composition is a good tracer of the hydrodynamical
processes that occur in stars as they often lead to mixing and particle transport.
By comparing abundances predicted by models and those o...