maravelias.info

on my professional endeavors...

maravelias.info

maravelias.info

maravelias.info

on my professional endeavors...

the basics

who am i?

Astrophysicist with a robust foundation in Physics and Engineering, complemented by proficient Data Science skills encompassing statistics and machine/deep learning applications.

current position

Since September 2024, I have been conducting research through PeriAstron, in collaboration with the Institute of Astrophysics – FORTH (in Crete, Greece). As a co-founder and Director of PeriAstron (est. 2022), I contribute to its mission of fostering science engagement and education, while building collaborative networks. I also teach Python at the Physics Department of the University of Crete.

research interests

Observational Astrophysics focusing on stellar astrophysics and massive stars (phases, evolution), in different galaxies. Use of statistical tools and implementation of machine/deep learning approaches. Professional-amateur networking and collaborations, and Openness in Astronomy.

latest news

The 2025 Winter School for Astrostatistics in Sharjah.
Traveling:
Teaching/Supervising:
Recent Top Publications:

Latest publications

New paper: Sana et al. 2025, A high fraction of close massive binary stars at low metallicity

New paper: Sana et al. 2025, A high fraction of close massive binary stars at low metallicity

This is a major work with contributions for many many people as we try to understand the behavior of massive stars at low metallicity. And...
Read More "New paper: Sana et al. 2025, A high fraction of close massive binary stars at low metallicity"
New paper: de Wit et al. 2025: Investigating episodic mass loss in evolved massive stars: III. Spectroscopy of dusty massive stars in three northern galaxies

New paper: de Wit et al. 2025: Investigating episodic mass loss in evolved massive stars: III. Spectroscopy of dusty massive stars in three northern galaxies

This is the complementary work to that of Alceste's published some time ago, covering the southern galaxies. Now it was Stephan and Gonzalo's turn to...
Read More "New paper: de Wit et al. 2025: Investigating episodic mass loss in evolved massive stars: III. Spectroscopy of dusty massive stars in three northern galaxies"
New paper: A machine-learning photometric classifier for massive stars in nearby galaxies II. The catalog

New paper: A machine-learning photometric classifier for massive stars in nearby galaxies II. The catalog

Finally...after some years from the initial paper on the method I managed to put everything together to publish the second part of the machine-learning classifier...
Read More "New paper: A machine-learning photometric classifier for massive stars in nearby galaxies II. The catalog"
New Paper: Antoniadis et al. 2025: Investigating the metallicity dependence of the mass-loss rate relation of red supergiants

New Paper: Antoniadis et al. 2025: Investigating the metallicity dependence of the mass-loss rate relation of red supergiants

Kostas has been actively working on determining the mass loss rate for Red Supergiants across various metallicities. We had plenty of these sources for NGC...
Read More "New Paper: Antoniadis et al. 2025: Investigating the metallicity dependence of the mass-loss rate relation of red supergiants"
New Paper: Bodensteiner et al. 2025: Binarity at Low Metallicity (BLOeM) — Multiplicity properties of Oe and Be stars

New Paper: Bodensteiner et al. 2025: Binarity at Low Metallicity (BLOeM) — Multiplicity properties of Oe and Be stars

Soon after the first paper of the BLOeM collaboration (describing the survey) another two papers followed on the multiplicity properties of specific populations. In one...
Read More "New Paper: Bodensteiner et al. 2025: Binarity at Low Metallicity (BLOeM) — Multiplicity properties of Oe and Be stars"
New Paper: Muñoz-Sanchez et al. 2024: The dramatic transition of the extreme Red Supergiant WOH G64 to a Yellow Hypergiant

New Paper: Muñoz-Sanchez et al. 2024: The dramatic transition of the extreme Red Supergiant WOH G64 to a Yellow Hypergiant

This is of the most intriguing object. We are still puzzled about its nature. From a red supergiant, it became a yellow one within months...
Read More "New Paper: Muñoz-Sanchez et al. 2024: The dramatic transition of the extreme Red Supergiant WOH G64 to a Yellow Hypergiant"

blog

New paper: Sana et al. 2025, A high fraction of close massive binary stars at low metallicity

This is a major work with contributions for many many people as we try to understand the behavior of massive stars at low metallicity. And of the key factors is binarity, how does it change when metallicity is decrease ? A high fraction of close massive binary stars at low …

Astronomy | Publications

Interview at Nea Kriti for the 2025 Summer School for Astrostatistics in Crete

It is more than a month sine the end of the 2025 Summer School of Astrostatistics in Crete. This time was needed to cool down and to complete other urgent tasks (attending another conference, complete the Python course obligations, etc). So it is actually only a few days ago that …

Astronomy

New paper: de Wit et al. 2025: Investigating episodic mass loss in evolved massive stars: III. Spectroscopy of dusty massive stars in three northern galaxies

This is the complementary work to that of Alceste’s published some time ago, covering the southern galaxies. Now it was Stephan and Gonzalo’s turn to lead this the paper for the northern galaxies, observed with the 10.4 m GTC. We managed to classify 122 additional sources, increasing the number of …

Astronomy | Publications

New paper: A machine-learning photometric classifier for massive stars in nearby galaxies II. The catalog

Finally…after some years from the initial paper on the method I managed to put everything together to publish the second part of the machine-learning classifier for massive stars in nearby galaxies. This work is actually the application of the classifier to the whole sample of 26 galaxies and about 1.1 …

Astronomy | Publications

New Paper: Antoniadis et al. 2025: Investigating the metallicity dependence of the mass-loss rate relation of red supergiants

Kostas has been actively working on determining the mass loss rate for Red Supergiants across various metallicities. We had plenty of these sources for NGC 6822 so it was natural to include them in a straight comparison with SMC, LMC and the Milky Way. However, each of these galaxies have …

Astronomy | Publications

New Paper: Bodensteiner et al. 2025: Binarity at Low Metallicity (BLOeM) — Multiplicity properties of Oe and Be stars

Soon after the first paper of the BLOeM collaboration (describing the survey) another two papers followed on the multiplicity properties of specific populations. In one of them, led by Julia Bodensteiner and Tomer Shenra, we looked into the multiplicity properties of the OBe population in the SMC. This is of …

Astronomy | Publications

New Paper: Muñoz-Sanchez et al. 2024: The dramatic transition of the extreme Red Supergiant WOH G64 to a Yellow Hypergiant

This is of the most intriguing object. We are still puzzled about its nature. From a red supergiant, it became a yellow one within months to year, showing B[e] characteristics. We are not certain if this is the correct answer or something else is undergoing. But definitely an exciting object …

Astronomy | Publications