Search Publications
On the scaling relations of bulges and early-type galaxies
Pastrav, Bogdan A.
Following from our recent work, we present here a detailed structural analysis of a representative sample of nearby spiral and early-type galaxies (ETGs) taken from the Key Insights on Nearby Galaxies: a Far-Infrared Survey with Herschel/ (KINGFISH) / Spitzer Infrared Nearby Galaxies Survey (SINGS) surveys. The photometric parameters of bulges are…
Fundamental parameters of the massive eclipsing binary HM1 8
Gamen, R.; Barbá, R. H.; Morrell, N. I. +5 more
We present a comprehensive study of the massive binary system HM1 8, based on multi-epoch high-resolution spectroscopy, V-band photometry, and archival X-ray data. Spectra from the OWN Survey, a high-resolution optical monitoring of Southern O and WN stars, are used to analyse the spectral morphology and perform quantitative spectroscopic analysis…
UVIT-HST-Gaia-VISTA study of Kron 3 in the Small Magellanic Cloud: a cluster with an extended red clump in ultraviolet
Cioni, Maria-Rosa L.; Chung, Chul; Bell, Cameron P. M. +6 more
We have demonstrated the advantage of combining multiwavelength observations, from the ultraviolet (UV) to near-infrared, to study Kron 3, a massive star cluster in the Small Magellanic Cloud. We have estimated the radius of the cluster Kron 3 to be 2.0 arcmin and for the first time, we report the identification of NUV-bright red clump (RC) stars …
New giant planet beyond the snow line for an extended MOA exoplanet microlens sample
Skowron, Jan; Fukui, Akihiko; Sumi, Takahiro +28 more
Characterizing a planet detected by microlensing is hard if the planetary signal is weak or the lens-source relative trajectory is far from caustics. However, statistical analyses of planet demography must include those planets to accurately determine occurrence rates. As part of a systematic modelling effort in the context of a >10-yr retrospe…
GLACE survey: Galaxy activity in ZwCl0024+1652 cluster from strong optical emission lines
Sánchez-Portal, Miguel; Pintos-Castro, Irene; Beyoro-Amado, Zeleke +9 more
Although ZwCl0024+1652 galaxy cluster at z ∼ 0.4 has been thoroughly analysed, it lacks a comprehensive study of star formation and nuclear activity of its members. With GaLAxy Cluster Evolution (GLACE) survey, a total of 174 H α emission-line galaxies (ELGs) were detected, most of them having [N II]. We reduced and analysed a set of [O III] and H…
The effect of continuum elimination in identifying circumstellar dust around Mira
Speck, Angela K.; Shepard, Lisa M.
Asymptotic giant branch (AGB) stars are major contributors of cosmic dust to the universe. Typically, dust around AGB stars is investigated via radiative transfer (RT) modelling, or via simple deconstruction of observed spectra. However, methodologies applied vary. Using archival spectroscopic, photometric, and temporal data for the archetypal dus…
A joint occultation and speckle investigation of the binary star TYC 1947-290-1 and of the asteroid (87) Sylvia
Richichi, A.; Dyachenko, V.; Obolentseva, M. +4 more
We report on the occultation of the star TYC 1947-290-1 by the asteroid (87) Sylvia. While asteroidal occultations occurring at fixed professional-level locations are relatively rare and are only recently starting to be observed with sufficiently high time resolution and sensitivity, they have the capability to measure sub-milliarcsecond angular d…
Far-UV Fe emission as proxy of Eddington ratios
Zheng, Wei
The Eddington ratio is a key parameter that governs the diversity of quasar properties. It can be scaled with a strong anticorrelation between optical Fe IIopt and [O III] emission. In search of such indicators in the far-UV band, the Hubble Space Telescope far-UV spectra of 150 low-redshift quasars are analysed in combination with thei…
X-ray observations of two candidate symbiotic binaries in the galactic bulge
Maccarone, T. J.; Britt, Christopher T.; Torres, M. A. P. +6 more
This paper analyses X-ray observations by the Chandra X-ray Observatory of CXOGBS J174614.3-321949 (CXB3) and CXOGBS J173620.2-293338 (CX332), two symbiotic binary star candidates identified by the Galactic Bulge Survey. Using new Chandra observations, we improved their X-ray positional uncertainties to 0.24 and 0.92 arcsec, respectively, confiden…
Monoceros OB4: a new association in Gaia DR2
Alves, J.; Teixeira, P. S.; Scholz, A. +2 more
We use Gaia DR2 data to survey the classic Monoceros OB1 region and look for the existence of a dispersed young population, co-moving with the cloud complex. An analysis of the distribution of proper motions reveals a 20-30 Myr association of young stars, about 300-400 pc away from the far side of the Mon OB1 complex, along the same general line o…