1.3k citations · 13.9k across the 272 of their papers we have counts for
27 papers · 1 filter
Active galactic nucleus activity in nearby disk galaxies: The roles of bar strength and spiral arm morphology
Zh. R. Martirosyan, A. A. Hakobyan, V. Adibekyan +3
(abridged) We investigate the dependence of AGN activity on bar strength and spiral arm morphology in nearby spiral galaxies, with a particular emphasis on disentangling their indi…
Supernovae Ia ejecta velocities and host galaxy environments: the role of survey-selection effects
L. V. Barkhudaryan, A. A. Hakobyan, M. H. Gevorgyan +6
The origin of the near-maximum-light Si II 6355 velocity diversity among supernovae Ia (SNe Ia) remains uncertain. Previous studies have suggested that high-velocity (HV) and no…
Calcium versus silicon ejecta velocities and decline rates in supernovae Ia: The role of high-velocity features
A. A. Hakobyan, M. H. Gevorgyan, A. G. Karapetyan +4
Photospheric and high-velocity features (PVFs and HVFs) of Si II 6355 and Ca II IR3 lines in supernova Ia (SN Ia) spectra provide insights into ejecta structure, energetics, and…
The Gaia-ESO Public Spectroscopic Survey: Implementation, data products, open cluster survey, science, and legacy
S. Randich, G. Gilmore, L. Magrini +161
In the last 15 years different ground-based spectroscopic surveys have been started (and completed) with the general aim of delivering stellar parameters and elemental abundances f…
Type Ia supernovae in the star formation deserts of spiral host galaxies
A. A. Hakobyan, A. G. Karapetyan, L. V. Barkhudaryan +2
Using a sample of nearby spiral galaxies hosting 185 supernovae (SNe) Ia, we perform a comparative analysis of the locations and light curve decline rates of normal and…
The Gaia-ESO Survey: Oxygen abundance in the Galactic thin and thick disks
Mariagrazia Franchini, Carlo Morossi, Paolo Di Marcantonio +18
We analyze the oxygen abundances of a stellar sample representative of the two major Galactic populations: the thin and thick disks. The aim is to investigate the differences betwe…
Supernovae and their host galaxies -- VII. The diversity of Type Ia supernova progenitors
A. A. Hakobyan, L. V. Barkhudaryan, A. G. Karapetyan +5
We present an analysis of the light curve (LC) decline rates of 407 normal and peculiar supernovae (SNe) Ia and global parameters of their host galaxies. As previously…
The Gaia-ESO survey: the non-universality of the age-chemical-clocks-metallicity relations in the Galactic disc
G. Casali, L. Spina, L. Magrini +36
In the era of large spectroscopic surveys, massive databases of high-quality spectra provide tools to outline a new picture of our Galaxy. In this framework, an important piece of…
Supernovae and their host galaxies -- VI. Normal Type Ia and 91bg-like supernovae in ellipticals
L. V. Barkhudaryan, A. A. Hakobyan, A. G. Karapetyan +4
We present an analysis of the galactocentric distributions of the "normal" and peculiar "91bg-like" subclasses of 109 supernovae (SNe) Ia, and study the global parameters of their…
The impact of spiral density waves on the star formation distribution: a view from core-collapse supernovae
A. G. Karapetyan, A. A. Hakobyan, L. V. Barkhudaryan +4
We present an analysis of the impact of spiral density waves (DWs) on the radial and surface density distributions of core-collapse (CC) supernovae (SNe) in host galaxies with diff…
The impact of spiral density waves on the distribution of Supernovae
A. G. Karapetyan, A. A. Hakobyan, L. V. Barkhudaryan +4
We present an analysis of the impact of spiral density waves (DWs) on the radial and surface density distributions of supernovae (SNe) in host galaxies with different arm classes.…
The Gaia-ESO Survey: the origin and evolution of s-process elements
L. Magrini, L. Spina, S. Randich +45
Several works have found an increase of the abundances of the s-process neutron-capture elements in the youngest Galactic stellar populations, giving important constraints to stell…
Estimating stellar birth radii and the time evolution of the Milky Way's ISM metallicity gradient
I. Minchev, F. Anders, A. Recio-Blanco +14
We present a semi-empirical, largely model-independent approach for estimating Galactic birth radii, r_birth, for Milky Way disk stars. The technique relies on the justifiable assu…
Supernovae and their host galaxies - V. The vertical distribution of supernovae in disc galaxies
A. A. Hakobyan, L. V. Barkhudaryan, A. G. Karapetyan +6
We present an analysis of the height distributions of the different types of supernovae (SNe) from the plane of their host galaxies. We use a well-defined sample of 102 nearby SNe…
The Distribution of Supernovae Relative to Spiral Arms of Host Disc Galaxies
L. S. Aramyan, A. A. Hakobyan, A. R. Petrosian +7
Using a sample of 215 supernovae (SNe), we analyse their positions relative to the spiral arms of their host galaxies, distinguishing grand-design (GD) spirals from non-GD (NGD) ga…
Supernovae Distribution and Host Galaxy Properties
A. A. Hakobyan, A. G. Karapetyan, L. V. Barkhudaryan +6
We present the summary of our last results on the spatial distribution and relative frequencies of Supernovae (SNe) in a large number of host galaxies from the Sloan Digital Sky Su…
The Impact of Bulges on the Radial Distribution of Supernovae in Disc Galaxies
A. A. Hakobyan, A. G. Karapetyan, L. V. Barkhudaryan +6
We present the results of the analysis of the impact of bulges on the radial distributions of the different types of supernovae (SNe) in the stellar discs of host galaxies with var…
The impact of bars on the radial distribution of supernovae in disc galaxies
A. A. Hakobyan, A. G. Karapetyan, L. V. Barkhudaryan +6
We present an analysis of the impact of bars on the radial distributions of the different types of supernovae (SNe) in the stellar discs of host galaxies with various morphologies.…
Supernovae and their host galaxies - IV. The distribution of supernovae relative to spiral arms
L. S. Aramyan, A. A. Hakobyan, A. R. Petrosian +7
Using a sample of 215 supernovae (SNe), we analyze their positions relative to the spiral arms of their host galaxies, distinguishing grand-design (GD) spirals from non-GD (NGD) ga…
Supernovae and their host galaxies - III. The impact of bars and bulges on the radial distribution of supernovae in disc galaxies
A. A. Hakobyan, A. G. Karapetyan, L. V. Barkhudaryan +6
We present an analysis of the impact of bars and bulges on the radial distributions of the different types of supernovae (SNe) in the stellar discs of host galaxies with various mo…
The Gaia-ESO Survey: Insights on the inner-disc evolution from open clusters
L. Magrini, S. Randich, P. Donati +37
Context. The inner disc, linking the thin disc with the bulge, has been somehow neglected in the past because of intrinsic difficulties in its study, due, e.g., to crowding and hig…
Supernovae and their host galaxies - II. The relative frequencies of supernovae types in spirals
A. A. Hakobyan, T. A. Nazaryan, V. Zh. Adibekyan +8
We present an analysis of the relative frequencies of different supernova (SN) types in spirals with various morphologies and in barred or unbarred galaxies. We use a well-defined…
The Gaia-ESO Survey: the Galactic Thick to Thin Disc transition
A. Recio-Blanco, P. de Laverny, G. Kordopatis +36
(Abridged) We have used the atmospheric parameters, [alpha/Fe] abundances and radial velocities, determined from the Gaia-ESO Survey GIRAFFE spectra of FGK-type stars (iDR1), to pr…
Searching for solar siblings among the HARPS data
S. F. A. Batista, V. Zh. Adibekyan, S. G. Sousa +3
The search for the solar siblings has been particularly fruitful in the last few years. Until now, there are four plausible candidates pointed out in the literature: HIP21158, HIP8…