Zobrazeno 1 - 10
of 307
pro vyhledávání: '"Varela Alejandro"'
Context. Mass is the most critical physical parameter in the evolution of a star. Since stars form in clusters their Initial Mass Function (IMF) is decisive in their evolution. Aims. Use Gaia DR3-based stellar masses_mass flame and the stellar member
Externí odkaz:
http://arxiv.org/abs/2410.23527
Autor:
Muñoz, Jaime, García-Varela, Alejandro, Henao-Castellanos, Santiago, Sabogal, Beatriz, Giraldo, Luis Felipe
Publikováno v:
The Astronomical Journal, 168:162 (9pp), 2024
TThe Period-Luminosity (PL) relation for Cepheid variable stars in the Large Magellanic Cloud (LMC) is crucial for distance measurements in astronomy. This study analyzes the impact of using the median rather than the mean on the PL relation's slope
Externí odkaz:
http://arxiv.org/abs/2408.01592
Publikováno v:
A&A 689, A18 (2024)
Context. Since the first publication of the Gaia catalogue a new view of our Galaxy has arrived. Its astrometric and photometric information has improved the precision of the physical parameters of open star clusters obtained from them. Aims. Using t
Externí odkaz:
http://arxiv.org/abs/2407.09407
Autor:
Bottazzi, Tamara, Varela, Alejandro
We formulate the issue of minimality of self-adjoint operators on a Hilbert space as a semi-definite problem, linking the work by Overton in [1] to the characterization of minimal hermitian matrices. This motivates us to investigate the relationship
Externí odkaz:
http://arxiv.org/abs/2405.08923
Autor:
Klobouk Abel H., Varela Alejandro
Publikováno v:
Demonstratio Mathematica, Vol 50, Iss 1, Pp 330-350 (2017)
Given a Hermitian matrix M ∈ M3(ℂ) we describe explicitly the real diagonal matrices DM such that ║M + DM║ ≤ ║M + D║ for all real diagonal matrices D ∈ M3(ℂ), where ║ · ║ denotes the operator norm. Moreover, we generalize our t
Externí odkaz:
https://doaj.org/article/7a6aa9f5db834c608f299a71f5da2f94
Machine learning (ML) is a promising approach for predicting small molecule properties in drug discovery. Here, we provide a comprehensive overview of various ML methods introduced for this purpose in recent years. We review a wide range of propertie
Externí odkaz:
http://arxiv.org/abs/2308.12354
Publikováno v:
A&A 677, A163 (2023)
Context. Near open clusters as Pleiades, Praesepe and Blanco 1 have been extensively studied due to their proximity to the Sun. The Gaia data brings the opportunity to investigate these clusters, since it contains valuable astrometric and photometric
Externí odkaz:
http://arxiv.org/abs/2304.00164
Autor:
Bottazzi, Tamara, Varela, Alejandro
We define the (convex) joint numerical range for an infinite family of compact operators in a Hilbert space H. We use this set to determine whether a self-adjoint compact operator A with {||A||, -||A||} in its spectrum is minimal respect to the set o
Externí odkaz:
http://arxiv.org/abs/2303.04128