Search Publications
Galactic resonance rings: modelling of motions in the wide solar neighbourhood
Melnik, A. M.
Models of the Galaxy with analytical Ferrers bars can reproduce the residual velocities of OB associations in the Sagittarius, Perseus and Local System star-gas complexes located within 3 kpc of the solar neighbourhood. Ferrers ellipsoids with a density distribution defined by power indices n = 1 and 2 are considered. The successful reproduction o…
A supragalactic conundrum: the globular clusters colour pattern in Virgo galaxies
Forte, Juan C.; Vega, E. Irene; Geisler, Douglas +8 more
The presence of systematic modulations in the colour distributions in composite samples of globular clusters (GCs) associated with galaxies in the Virgo and Fornax clusters has been reported in a previous work. In this paper, we focus on the 27 brightest galaxies in Virgo, and in particular on NGC 4486, the dominant system in terms of GC populatio…
VVV-WIT-07: another Boyajian's star or a Mamajek's object?
Minniti, D.; Saito, R. K.; Baptista, R. +6 more
We report the discovery of VVV-WIT-07, a unique and intriguing variable source presenting a sequence of recurrent dips with a likely deep eclipse in 2012 July. The object was found serendipitously in the near-IR data obtained by the VISTA Variables in the Vía Láctea (VVV) ESO public survey. Our analysis is based on VVV variability, multicolour, an…
Not so different after all: properties and spatial structure of column density peaks in the pipe and Orion A clouds
Lombardi, Marco; Palau, Aina; Alfaro, Emilio +4 more
We present a comparative study of the physical properties and the spatial distribution of column density peaks in two giant molecular clouds (GMCs), the Pipe Nebula and Orion A, which exemplify opposite cases of star cluster formation stages. The density peaks were extracted from dust extinction maps constructed from Herschel/SPIRE far-infrared im…
Gas phase SiO in the circumstellar environment of the recurrent nova T Coronae Borealis
Munari, U.; Gehrz, R. D.; Shahbandeh, M. +9 more
We report the discovery of the diatomic molecule SiO in the gas phase in the environment of the recurrent nova T Coronae Borealis. While some of the SiO is photospheric, a substantial portion must arise in the wind from the red giant component of T CrB. A simple fit to the SiO feature, assuming local thermodynamic equilibrium, suggests a SiO colum…
Star-forming regions at the periphery of the supershell surrounding the Cyg OB1 association - II. ISM kinematics and YSOs in the star cluster vdB 130 region
Wiebe, D. S.; Moiseev, A. V.; Lozinskaya, T. A. +4 more
We present an observational study of small-scale feedback processes operating in the star-forming region located in the wall of the expanding supershell around the Cyg OB1 association. The interstellar gas and dust content and pre-stellar populations in the vicinity of the open star cluster vdB 130 are analysed based on new optical and IR observat…
Clues on Arp 142: The spiral-elliptical merger
Mendes de Oliveira, Claudia; Firpo, Verónica; Torres-Flores, Sergio +3 more
Nearby merging pairs are unique laboratories in which one can study the gravitational effects on the individual interacting components. In this manuscript, we report the characterization of selected H II regions along the peculiar galaxy NGC 2936, member of the galaxy pair Arp 142, an E+S interaction, known as `The Penguin'. Using Gemini South spe…
Comet C/2018 V1 (Machholz-Fujikawa-Iwamoto): dislodged from the Oort Cloud or coming from interstellar space?
de la Fuente Marcos, R.; de la Fuente Marcos, C.
The chance discovery of the first interstellar minor body, 1I/2017 U1 (`Oumuamua), indicates that we may have been visited by such objects in the past and that these events may repeat in the future. Unfortunately, minor bodies following nearly parabolic or hyperbolic paths tend to receive little attention: over 3/4 of those known have data-arcs sh…
Revised and updated catalogue of the First Byurakan Survey of Late-Type Stars: second edition
Gigoyan, K. S.; Kostandyan, G. R.; Mickaelian, A. M.
A total of 18 lists of the First Byurakan Survey of Late-Type Stars (FBS LTS) were published between 1990 and 2016. The stars were found on FBS low-dispersion spectroscopic plates. A systematic search and selection were carried out on a surface of ∼16 000 deg2 on almost the whole area of the FBS. As a result, the 'Revised and Updated Ca…
From outburst to quiescence: spectroscopic evolution of V1838 Aql imbedded in a bow-shock nebula
Chavushyan, V.; Neustroev, V.; García-Díaz, Ma T. +15 more
We analyse new optical spectroscopic, direct-image and X-ray observations of the recently discovered a high-proper motion cataclysmic variable V1838 Aql. The data were obtained during its 2013 superoutburst and its subsequent quiescent state. An extended emission around the source was observed up to 30 d after the peak of the superoutburst, interp…