Search Publications
Neutral-gas-phase metal abundances in Zn II-selected quasar absorption line systems near redshift z = 1.2
Turnshek, David A.; Rao, Sandhya M.; Monier, Eric M. +2 more
We present 10 metallicity measurements for quasar absorbers near z = 1.2 that were selected for having unusually significant Zn II absorption in their Sloan Digital Sky Survey (SDSS) spectra. Follow-up UV space spectroscopy of the Lyα region shows that all 10 have damped Lyα (DLA) absorption, corresponding to neutral hydrogen column densities in t…
SB 796: a high-velocity RRc star
Soszyński, Igor; Gomel, Roy; Faigler, Simchon +6 more
We report here on a detailed study of a c-type RR Lyrae variable (RRc variable), SB 796, serendipitously discovered in a search of the WASP public data for stars that display large photometric periodic modulation. SB 796 displays a period of P = 0.26585 d and semi-amplitude of ∼0.1 mag. Comparison of the modulation shape and period with the detail…
The Sejong Open cluster Survey (SOS) VI. A small star-forming region in the high Galactic latitude molecular cloud MBM 110
Song, Inseok; Bessell, Michael S.; Sung, Hwankyung
We present optical photometric, spectroscopic data for the stars in the high Galactic latitude molecular cloud MBM 110. For the complete membership selection of MBM 110, we also analyse Wide-field Infrared Survey Explorer(WISE) mid-infrared data and Gaia astrometric data. Membership of individual stars is critically evaluated using the data mentio…
Faint, high proper motion star candidates selected from the SDSS and PS1 catalogues
Ofek, Eran O.; Segev, Noam
High proper motion stars probe several extreme stellar populations, including nearby objects, Galactic halo stars, and hypervelocity stars. Extending the search for high proper motion stars, to faint limits can increase their numbers and help to identify interesting targets. We conduct a search for faint (rSDSS > 19.5 mag) high prope…
Impact of galactic interactions on the evolution of the far-infrared-radio correlation
Pavlović; , M.; Prodanović +1 more
A strong correlation has been known to exist between the far-infrared (FIR) and radio emission of star-forming galaxies. Observations have shown that, although scatter is present, this correlation holds over a range of redshifts and does not evolve. However, there have been a number of more recent observations, especially in higher redshift survey…
Elemental abundances of RGB and red clump stars in the Kepler field
Wang, L.; Zhao, G.; Takeda, Y. +2 more
The helium flash is a key point in the evolution process of stars that have evolved off the main sequence. However, chemical abundance differences in the stellar photosphere before and after this step are poorly investigated, mainly because of the degeneracy of red giant branch (RGB) and red clump stars (RC) in the Hertzsprung-Russell (HR) diagram…
A new sample of southern radio galaxies: host-galaxy masses and star-formation rates
Jarvis, Matt J.; Prescott, Matthew; Marubini, Takalani +3 more
In this study we define a new sample of distant powerful radio galaxies in order to study their host galaxy properties and provide targets for future observations of H I absorption with new radio telescopes and to understand the fuelling and feedback from such sources. We have cross-matched the Sydney University Molonglo Sky Survey (SUMSS) radio c…
Probabilistic galeeactic dynamics - I. The Sun and GJ 710 with Monte Carlo, linearized, and unscented treatments
Jones, H. R. A.; Feng, F.
Deterministic galactic dynamics is impossible due to a lack of precise knowledge of the initial conditions and galactic potential. Instead of treating stellar orbits deterministically, we integrate not only the mean but also the covariance of a stellar orbit in the Galaxy. As a test case, we study the probabilistic dynamics of the Sun and the star…
Co-formation of the disc and the stellar halo
Evans, N. W.; Belokurov, V.; Koposov, S. E. +2 more
Using a large sample of main sequence stars with 7D measurements supplied by Gaia and SDSS, we study the kinematic properties of the local (within ∼10 kpc from the Sun) stellar halo. We demonstrate that the halo's velocity ellipsoid evolves strongly with metallicity. At the low-[Fe/H] end, the orbital anisotropy (the amount of motion in the radial…
A catalogue of masses, structural parameters, and velocity dispersion profiles of 112 Milky Way globular clusters
Hilker, M.; Baumgardt, H.
We have determined masses, stellar mass functions, and structural parameters of 112 Milky Way globular clusters by fitting a large set of N-body simulations to their velocity dispersion and surface density profiles. The velocity dispersion profiles were calculated based on a combination of more than 15000 high-precision radial velocities which we …