Zobrazeno 1 - 10
of 66
pro vyhledávání: '"Asa'd, Randa"'
Autor:
Asa'd, Randa, Hernandez, S., John, Johina M., Alfaro-Cuello, M., Wang, Z., As'ad, A., Vasini, A., Matteucci, F.
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 stellar abundances of star clusters. MUSE has been used to target more than
Externí odkaz:
http://arxiv.org/abs/2404.15527
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 values of the projected rotational velocity when they are fitted with sin
Externí odkaz:
http://arxiv.org/abs/2312.04787
Autor:
Asa'd, Randa, Hernandez, S., As'ad, A. M., Molero, M., Matteucci, F., Larsen, S., Chilingarian, Igor V.
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 Myr) using integrated-light spectroscopic observations obtained with
Externí odkaz:
http://arxiv.org/abs/2203.11868
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 compare the age, metallicity and reddening of star clusters obtained fr
Externí odkaz:
http://arxiv.org/abs/2203.09985
Autor:
Asa'd, Randa, Goudfrooij, Paul, As'ad, A. M., El-Mir, H. G., Begum, L., Aljasmi, A., Almatroushi, O.
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 deriving possible age spreads within a star cluster. We test how well a
Externí odkaz:
http://arxiv.org/abs/2104.11873
Autor:
Goudfrooij, Paul, Asa'd, Randa
Publikováno v:
MNRAS, 501, 440-466 (2021)
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 fitting technique, we study the influence of star cluster mass through stoch
Externí odkaz:
http://arxiv.org/abs/2011.08244
On the Precision of Full-spectrum Fitting of Simple Stellar Populations. I. Well-sampled Populations
Autor:
Asa'd, Randa, Goudfrooij, Paul
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 range of 6.8 $<$ log (age/yr) $<$ 10.2, for three wavelength ranges in th
Externí odkaz:
http://arxiv.org/abs/2008.07582
Autor:
Asa'd, Randa, Kovalev, M., Davies, B., Ivanov, V. D., Rejkuba, M., Gonneau, A., Hernandez, S., Lardo, C., Bergemann, M.
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 and violent star formation events in the inner Galaxy. However, due to
Externí odkaz:
http://arxiv.org/abs/2007.06583
Autor:
Bastian, Nate, Lardo, Carmela, Usher, Christopher, Kamann, Sebastian, Larsen, Soeren S., Cabrera-Ziri, Ivan, Chantereau, William, Martocchia, Silvia, Salaris, Maurizio, Asa'd, Randa, Hilker, Michael
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 stars that show the anomalous chemistry) depend on the mass as well as the
Externí odkaz:
http://arxiv.org/abs/2003.03428
Autor:
Bastian, Nate, Usher, Christopher, Kamann, Sebastian, Lardo, Carmela, Larsen, Søren S., Cabrera-Ziri, Ivan, Chantereau, William, Martocchia, Silvia, Salaris, Maurizio, Schiavon, Ricardo P., Asa'd, Randa, Hilker, Michael
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 studied nearby galaxies. Most previous studies have focussed on resol
Externí odkaz:
http://arxiv.org/abs/1909.01404