100 citations · 235 across the 18 of their papers we have counts for
19 papers
Tracing M22's origins: Spatial and chemical constraints on its formation history
Emanuele Dondoglio, Antonino P. Milone, Randa Asa'd +9
Globular clusters (GCs) are well known to host stellar populations characterized by light-element variations. A subset of Galactic GCs, beyond such 'canonical' populations, contain…
Tidally perturbed pulsations in OO Dra
Niveditha Parthasarathy, Mikhail Kovalev, Randa Asa'd
We perform a pulsation analysis of OO Dra using Light Curve data from TESS and present the first identification of six dipole modes as doublets from the primary star in OO Dra. The…
Multiple populations along the asymptotic giant branch: a Gaia+APOGEE study of 22 Galactic globular clusters
Emanuele Dondoglio, A. P. Milone, A. F. Marino +9
We present an investigation of multiple stellar populations along the asymptotic giant branch (AGB) in 22 globular clusters (GCs), exploiting APOGEE spectroscopy combined with AGB…
Semi-empirical versus Theoretical Stellar Population Models: a comparison with Star Clusters
Randa Asad, Paula R. T. Coelho, Johina M. John +3
Stellar population synthesis (SPS) models are a key tool for deriving the age, metallicity, radial velocity and reddening of star clusters from their integrated spectra. Using a sa…
NGC1856: Using machine learning techniques to uncover detailed stellar abundances from MUSE data
Randa Asa'd, S. Hernandez, Johina M. John +5
We present the first application of the novel approach based on data-driven machine learning methods applied to Multi-Unit Spectroscopic Explorer (MUSE) field data to derive stella…
Search for spectroscopic binaries using rotational velocities in five open clusters observed by ESO
Mikhail Kovalev, Mariyam Ahmed, Randa Asa'd
In this paper we detect double-lined spectroscopic binaries (SB2) in five open clusters: NGC 2243, NGC 2420, NGC 3532, NGC 6253 and NGC 6705 (M 11) using a method based on high val…
Detailed Chemical Abundances of Star Clusters in the Large Magellanic Cloud
Randa Asa'd, S. Hernandez, A. M. As'ad +4
We derive the first detailed chemical abundances of three star clusters in the Large Magellanic Cloud (LMC), NGC1831 (436+/-22 Myr), NGC1856 (350+/-18 Myr) and [SL63]268 (1230+/-62…
On the Precision of Full-Spectrum Fitting of Simple Stellar Populations. IV. A Systematic Comparison with Results from Colour-Magnitude Diagrams
Randa Asa'd, Paul Goudfrooij, A. M. As'ad
In this fourth paper of a series on the precision of ages of stellar populations obtained through the full-spectrum fitting technique, we present a first systematic analysis that c…
On the Precision of Full-spectrum Fitting of Stellar Populations. III. Identifying Age Spreads
Randa Asa'd, Paul Goudfrooij, A. M. As'ad +4
In this third paper of a series on the precision of obtaining ages of stellar populations using the full spectrum fitting technique, we examine the precision of this technique in d…
On the precision of full-spectrum fitting of simple stellar populations. II. The dependence on star cluster mass in the wavelength range 0.3-5.0 m
Paul Goudfrooij, Randa Asa'd
In this second paper of a series on the accuracy and precision of the determination of age and metallicity of simple stellar populations (SSPs) by means of the full spectrum fittin…
On the Precision of Full-spectrum Fitting of Simple Stellar Populations. I. Well-sampled Populations
Randa Asa'd, Paul Goudfrooij
We investigate the precision of the ages and metallicities of 21,000 mock simple stellar populations (SSPs) determined through full-spectrum fitting. The mock SSPs cover an age ran…
Analysis of Red-Supergiants in VdBH 222
Randa Asa'd, M. Kovalev, B. Davies +6
Recent surveys uncovered new Young Massive Clusters (YMCs) that host dozens of Red Supergiants (RSGs) in the inner Milky Way. These clusters are ideal for studying the most recent…
Searching for Multiple Populations in the Integrated Light of the Young and Extremely Massive Clusters in the Merger Remnant NGC~7252
Nate Bastian, Carmela Lardo, Christopher Usher +8
Recent work has shown that the properties of multiple populations within massive stellar clusters (i.e., in the extent of their abundance variations as well as the fraction of star…
Multiple populations in globular clusters and their parent galaxies
A. P. Milone, A. F. Marino, G. S. Da Costa +14
The 'chromosome map' diagram (ChM) proved a successful tool to identify and characterize multiple populations (MPs) in 59 Galactic Globular Clusters (GCs). Here, we construct ChMs…
Multiple Populations in Integrated Light Spectroscopy of Intermediate Age Clusters
Nate Bastian, Christopher Usher, Sebastian Kamann +9
The presence of star-to-star light-element abundance variations (a.k.a. multiple populations, MPs) appears to be ubiquitous within old and massive clusters in the Milky Way and all…
Using Star Clusters as Tracers of Star Formation and Chemical Evolution: the Chemical Enrichment History of the Large Magellanic Cloud
Igor Chilingarian, Randa Asa'd
The star formation (SFH) and chemical enrichment (CEH) histories of Local Group galaxies are traditionally studied by analyzing their resolved stellar populations in a form of colo…
Young LMC clusters: the role of red supergiants and multiple stellar populations in their integrated light and CMDs
Randa S. Asa'd, Alexandre Vazdekis, Miguel Cervino +3
The optical integrated spectra of three LMC young stellar clusters (NGC 1984, NGC 1994 and NGC 2011) exhibit concave continua and prominent molecular bands which deviate significan…
Ages of LMC Star Clusters using ASAD
Randa S. Asa'd, Alexandre Vazdekis, Sami Zeinelabdin
We use ASAD, the new version of ASAD (Analyzer of Spectra for Age Determination), to obtain the age and reddening of 27 LMC clusters from full fitting of integrated spectra usi…
Analyzer of Spectra for Age Determination (ASAD) - Algorithm and Applications
Randa Asa'd
Analyzer of Spectra for Age Determination (ASAD) is a new package that can easily predict the age and reddening of stellar clusters from their observed optical integrated spectra b…