Search Publications
Variable stars in young open cluster NGC 2244
Michalska, Gabriela
We present results of a UBVIC variability survey in the young open cluster NGC 2244. In total, we found 245 variable stars. Most of them, 211 stars, are variables with irregular variations. Furthermore, 23 periodic variables were found. We also detected four candidates for δ Scuti stars and seven eclipsing binaries. Based on the mid-inf…
Young star clusters and the structure of the second Galactic quadrant II
Molina Lera, J. A.; Baume, G.; Gamen, R.
Galactic spiral arms are traced using young objects as giant molecular clouds, H II regions, OB stars, or young open/embedded clusters. To improve the knowledge of the Galactic structure in the second quadrant we selected, from more than 200 open clusters covered by the SDSS, a sample of 10 young stellar clusters to conduct a spectrophotometric st…
Inquiring into the nature of the Abell 2667 brightest cluster galaxy: physical properties from MUSE
Berta, S.; Popesso, P.; Rodighiero, G. +21 more
Based on HST and MUSE data, we probe the stellar and gas properties (i.e. kinematics, stellar mass, star formation rate) of the radio-loud brightest cluster galaxy (BCG) located at the centre of the X-ray-luminous cool-core cluster Abell 2667 (z = 0.2343). The bi-dimensional modelling of the BCG surface brightness profile reveals the presence of a…
Heterogeneous evolution of the Galaxy and the origin of the short-lived nuclides in the early solar system
Kaur, Tejpreet; Sahijpal, Sandeep
We present Galactic chemical evolution (GCE) models of the short-lived radionuclides (SLRs), 26Al, 36Cl, 41Ca, 53Mn, and 60Fe, across the entire Milky Way galaxy. The objective is to understand the spatial and temporal distribution of the SLRs in the galaxy. The gamma-ray observations infer wi…
Search for multiwavelength emission from the binary millisecond pulsar PSR J1836-2354A in the globular cluster M22
de Martino, D.; Di Salvo, T.; Iaria, R. +5 more
We present a multiband search for X-ray, optical, and γ-ray emission of the radio binary millisecond pulsar J1836-2354A, hosted in the globular cluster M22. X-ray emission is significantly detected in two Chandra observations, performed in 2005 and 2014, at a luminosity of ∼2-3 × 1030 erg s-1, in the 0.5-8 keV energy range. T…
Monitoring of the D doublet of neutral sodium during transits of two `evaporating' planets
Hirano, T.; Ansdell, M.; Gaidos, E.
Spectroscopic transit detection of constituents in winds from `evaporating' planets on close-in transiting orbits could provide desperately needed information on the composition, formation, and orbital evolution of such objects. We obtained high-resolution optical spectra of the host stars during a single transit of Kepler-1520b and two transits o…
Depth of the dynamo region and zonal circulation of the molecular layer in Saturn inferred from its equatorially symmetric gravitational field
Schubert, Gerald; Kong, Dali; Zhang, Keke
The high-precision equatorially symmetric gravitational field of Saturn (the even gravitational coefficients J2, J4, …, J12) measured by the Cassini Grand Finale reflects its internal structure, its non-spherical shape caused by rotation and its strong zonal circulation whose location is controlled by the depth of …
VALES V: a kinematic analysis of the molecular gas content in H-ATLAS galaxies at z ∼ 0.03-0.35 using ALMA
Leiton, R.; Bauer, F. E.; Farrah, D. +19 more
We present Atacama Large Millimeter/submillimeter Array (ALMA) resolved observations of molecular gas in galaxies up to z = 0.35 to characterize the role of global galactic dynamics on the global interstellar medium properties. These observations consist of a sub-sample of 39 galaxies taken from the Valparaíso ALMA Line Emission Survey (VALES). Fr…
Quantifying the AGN-driven outflows in ULIRGs (QUADROS) IV: HST/STIS spectroscopy of the sub-kpc warm outflow in F14394+5332
Batcheldor, D.; Ramos Almeida, C.; Tadhunter, C. +1 more
Considerable uncertainties remain about the nature of warm, AGN-driven outflows and their impact on the evolution of galaxies. This is because the outflows are often unresolved in ground-based observations. As part of a project to study the AGN outflows in some of the most rapidly evolving galaxies in the local Universe, here we present Hubble Spa…
A transiting super-Earth close to the inner edge of the habitable zone of an M0 dwarf star
Bonavera, L.; Rebolo, R.; González Hernández, J. I. +9 more
We present a super-Earth orbiting close to the inner edge of the habitable zone of the cool dwarf star K2-286 (EPIC 249889081), detected with data from the K2 mission in its 15th campaign. The planet has radius of 2.1 ± 0.2 R⊕, near the 1.5-2.0 R⊕ gap in the radii distribution. The equilibrium temperature is 347^{+21}_{-11} K…