Daniela Turis
Regular PhD student in Astrophysics, Universidad de Valparaíso, Chile.

Master in Astrophysics (March 2023), Universidad de Valparaíso, Valparaíso, Chile.

Licenciada en Ciencias mención Astronomía (2021) Universidad de Chile, Santiago, Chile.
Email: daniela.turis@postgrado.uv.cl

I’m currently working with prof. Michel Curé determined the stellar parameters of higher-rotation massive stars using the ZPEKTR code, which considers the oblate shape of the high-rotational stars and the effect of gravity and limb darkening.
In my master thesis, I used 10 Be stars from the BeSOS database and two extremely metal-poor O stars which far-ultraviolet spectra are from the Hubble Space Telescope, proportionated by Dr. Grace Telford from Rutgers University. I created a grid of models for each star to find the best fit for the observed spectrum.

Natalia Machuca
Regular PhD student in Astrophysics at Universidad de Valparaíso.
Master in Astrophysics (April 2022), Universidad de Valparaíso, Valparaíso, Chile.
Email: natalia.machuca@postgrado.uv.cl

I’m currently working on rewriting an IDL program called Iacob-broad into Python language. Also, I’m studying the «SEI» method for a posterior implementation of hydwind code on it. In my PhD’s thesis, I’m working with the ISOSCELES database of models, determining stellar and wind parameters of a set of observed massive stars from IACOB database.

Gonzalo Aravena
Regular PhD student in Astrophysics at Universidad de Valparaíso.
Master in Astronomy (August 2020), Universidad de Antofagasta, Antofgasta, Chile.
Email: gonzalo.aravena@postgrado.uv.cl

I am working with Professor Michel to investigate the «weak wind problem» in late O-type stars (O8-9V) using the CMFGEN and Fastwind codes with the Hydwind implementation. These codes help me to create atmospheric models that match the observed spectra of these stars on the basis that weak winds could correspond to a fast solution with the highest possible delta value.

Felipe Figueroa
Regular PhD student in astrophysics, Universidad de Valparaíso.

• Master in astrophysics (2024), Universidad de Valparaíso, Valparaíso, Chile.

Title: «Stellar Winds of O-Type Stars: A Self-Consistent Approach for Mass-Loss
Rates & Wind Parameters», https://repositoriobibliotecas.uv.cl/collections/

• Licenciado en Física con M/astronomía (Jan 2023), Universidad de Valparaíso, Valparaíso, Chile.

Website: https://felipefigueroat.github.io/ 

Email: felipe.figueroat@postgrado.uv.cl

My research focuses on the theoretical study of the hydrodynamical behavior of the winds in massive O- and B-type stars. I calculate line-force parameters in a self-consistent manner, using both the m-CAK formalism and alternative approaches that are independent of this theory. For my Master’s thesis, I developed three grids converging hundreds of self-consistent theoretical models, which enabled a more robust statistical analysis of the mass-loss rates in O-type stars. This work led to a Bayesian fitted relation describing the dependence of mass-loss rates on stellar parameters. In my current PhD research, I am expanding these calculations to a broader region of the Hertzsprung–Russell diagram and comparing the results with predictions from theoretical formalisms other than m-CAK.

Jassir Salas
Master in astrophysics, Universidad de Valparaíso, Valparaíso, Chile.
Email:

I’m Jassir Salas, and I worked with Be Stars under the supervision of professors Catalina Arcos and Maja Vučkovič. I analyzed light curves of Be stars from the Transiting Exoplanet Survey Satellite (TESS) with the help of lightkurve (Python package). The main objective of my research was to look for variability and disk presence in these stars to find correlations between these two exciting phenomena. During my undergrad at Universidad del Atlántico, Colombia, I worked on exoplanet formation and evolution.

David Concha
Master in Astrophysics (April 2023), Universidad de Valparaíso, Valparaíso, Chile.  Licenciado en Física con M/astronomía (2020), Universidad de Valparaíso, Valparaíso, Chile.
Email: david.concha@postgrados.uda.cl

I worked with prof. Catalina Arcos characterizing the disk and line-profile variability of the Be star pi Aqr. During my master’s thesis, I learned how to use the 3D Monte Carlo radiative transfer code HDUST to obtain theoretical hydrogen Iines profiles to be compared with observations. Data used in this work were from the PUCHEROS and BESS databases. Also, this work was in the frame of an international collaboration with USP (FAPESP project).

Martin Solar
PhD. Student at Adam Mickiewicz University, Poland.
Master in Astrophysics (Mar 2021), Universidad de Valparaíso, Valparaíso, Chile.
Email: msolar95@gmail.com

During my master I worked with prof. Michel Curé, in the study of stellar rotations in massive stars applying de-convolution methods for non-spherical distributions in the unit sphere of observation. Our analysis was made by using apparent rotational velocities values taken from the literature, e.g., vizier. Also, I developed an automatic procedure that uses Fourier Transform to determine the projected rotational velocity measured in different lines for a large sample of spectra.

Josephin Chamon
Regular master student in astronomy, Universidad de Antofagasta, Antofagasta, Chile.
Licenciada en Física con M/astronomía (Jan 2021), Universidad de Valparaíso, Valparaíso, Chile.
Email: josephin@live.cl

Publication: See Publications

I worked with prof. Catalina Arcos on detection of changes in the spectra of Be stars observed at different disk phases. During the last years, I learned how to carry out echelle spectroscopic observations and the corresponding data reduction, also, how to use stellar atmospheres models and contrast them with photometric and spectroscopic data determining equivalent widths and radial velocities using Gaussian/Voigt distributions.

Abigali Rodríguez
Regular PhD student at Universidad de Chile.
Master in Astrophysics (Aug 2022), Universidad de Valparaíso, Valparaíso, Chile.
Email: abigali776046@gmail.com

During my master I worked with Dr. Michel Curé in the study of viscous stellar winds in fast rotating stars. As an alternative, my main aim is to return to the physical bases that Araújo et al. 1995 considered in his paper, in order to complement the work developed by Curé in 2004.

Felipe Herrera
Master in astrophysics, Universidad de Valparaíso, Valparaíso, Chile.
Licenciado en Física con M/astronomía (Jan 2023), Universidad de Valparaíso, Valparaíso, Chile.
Email:

I just worked with prof. Catalina Arcos automating a program to obtain measurements on observed lines in optical spectra of a sample of Be stars, called Be-ROBOT.

Yanina López
Licenciatura en Física con M/astronomía, Universidad de Valparaíso, Valparaíso, Chile.
Email:

I  worked with prof. Catalina Arcos, processing spectra of Be stars from the BeSS database.