Search Publications
IU Cancri: a solar-type contact binary with mass transfer
Dai, Hai-Feng; Yuan, Hui-Yu; Yang, Yuan-Gui
We present new CCD photometry of the solar-type contact binary IU Cnc, which was observed from November 2017 to March 2018 with three small telescopes in China. BV light curves imply that IU Cnc is a W-type contact binary with total eclipses. The photometric solution indicates that the mass ratio and fill-out factor are q = 4.104 ± 0.004 and f = 3…
QSOs sigposting cluster size halos as gravitational lenses: halo mass, projected mass density profile and concentration at z~0.7
Bonavera, L.; González-Nuevo, J.; Negrello, M. +6 more
Magnification bias is a gravitational lensing effect that is normally overlooked because it is considered sub-optimal in comparison with the lensing shear. Thanks to the demonstrated optimal characteristics of the sub-millimetre galaxies (SMGs) for lensing analysis, in this work we were able to measure the magnification bias produced by a sample o…
Correlation length around Mars: a statistical study with MEX and MAVEN observations
Fränz, Markus; Echer, Ezequiel; Marques de Souza Franco, Adriane +1 more
Asteroseismology of the Pre-main-sequence δ Scuti Pulsator IP Persei
Li, Yan; Chen, Xinghao
A grid of theoretical models are computed to fit the nine oscillation modes of IP Per detected earlier from a multi-site ground-based campaign. Fitting results show that there are two sets of theoretical models that could reproduce the observed frequencies more or less equally as well. In view of other available spectroscopic and photometric measu…
Observational determination of the galaxy bias from cosmic variance with a random pointing survey: clustering of z ∼ 2 galaxies from Hubble's BoRG survey
Cameron, Alex J.; Livermore, Rachael C.; Trenti, Michele +1 more
Gravitational clustering broadens the count-in-cells distribution of galaxies for surveys along uncorrelated (well-separated) lines of sight beyond Poisson noise. A number of methods have proposed to measure this excess `cosmic' variance to constrain the galaxy bias (i.e. the strength of clustering) independently of the two-point correlation funct…
A nuclear ionized gas outflow in the Seyfert 2 galaxy UGC 2024
Robinson, Andrew; Schnorr-Müller, Allan; Storchi-Bergmann, Thaisa +15 more
As part of a high-resolution observational study of feeding and feedback processes occurring in the vicinity of the active galactic nucleus in 40 galaxies, we observed the inner 3{^''.}5 × 5 arcsec of the nearby spiral and Seyfert 2 galaxy UGC 2024 with the integral field unit of the Gemini-South Telescope. The observations enabled a st…
Detailed spectroscopic and photometric study of three detached eclipsing binaries
Kahraman Aliçavuş, F.; Aliçavuş, F.
Detached eclipsing binaries are remarkable systems to provide accurate fundamental stellar parameters. Fundamental stellar parameters and the metallicity values of stellar systems are needed to deeply understand stellar evolution and formation. In this study, we focus on the detailed spectroscopic and photometric studies of three detached eclipsin…
The Case for a Large-scale Occultation Network
Rice, Malena; Laughlin, Gregory
We discuss the feasibility of and present initial designs and approximate cost estimates for a large (N ∼ 2000) network of small photometric telescopes that is purpose-built to monitor V ≲ 15 Gaia mission program stars for occultations by minor solar system bodies. The implementation of this network would permit measurement of the solar system’s t…
Spectral analysis of the barium central star of the planetary nebula Hen 2-39
Boffin, H. M. J.; Jones, D.; Löbling, L.
Context. Barium stars are peculiar red giants characterized by an overabundance of the elements synthesized in the slow neutron-capture nucleosynthesis (s-process elements) along with an enrichment in carbon. These stars are discovered in binaries with white dwarf companions. The more recently formed of these stars are still surrounded by a planet…
Search for the evolutionary relationship between Galactic globular and open clusters using data from the Gaia DR2 catalogue
Bobylev, V. V.; Bajkova, A. T.
Passing through the Galactic disc, a massive object such as a globular cluster, can trigger star formation process leading to the birth of open clusters. Here, we analyse such possible evolutionary relationship between globular and open clusters. To search for the closest rapprochement between objects we computed backwards the orbits of 150 Galact…