maravelias.info

about Grigoris Maravelias

maravelias.info

maravelias.info

maravelias.info

about Grigoris Maravelias

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 2018 I am working as a post-doc at the National Observatory of Athens (although you will finding me more in Heraklion, Crete), with Dr. Alceste Bonanos for the ASSESS project.

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 publications

blog

The 2024 Summer School for Astrostatistics in Crete is ready to launch!

It is Friday night and only two days are left before another Summer School for Astrostatistics in Crete ! Everything is ready and I am excited for a totally new iteration of our school. I have to admit though that after three already successful events we have streamlined the process. …

New paper: de Wit et al. 2024: Investigating episodic mass loss in evolved massive stars: II. Physical properties of red supergiants at subsolar metallicity

Stephan extends the work he has performed previously in the Magellanic Clouds to RSGs identified in the ASSESS project in galaxies at subsolar metallicity. Investigating episodic mass loss in evolved massive stars: II. Physical properties of red supergiants at subsolar metallicity S. de Wit, A.Z. Bonanos, K. Antoniadis, E. Zapartas, …

New paper: Establishing a mass-loss rate relation for red supergiants in the Large Magellanic Cloud

This is a paper led by Kostas from the ASSESS team where we investigated the mass-loss in LMC/s RSGs. Interestingly this made its way to the astrobites site. Establishing a mass-loss rate relation for red supergiants in the Large Magellanic Cloud K. Antoniadis, A.Z. Bonanos, S. de Wit, E. Zapartas, …

The 2024 Summer School for Astrostatistics in Crete – the announcement

The deadline for the 2024 iteration of the Summer School for Astrostatistics in Crete is approaching fast. We are excited to host this event, which actually starts to settle as an annual event. And why not since it seems there is a huge need in practical training in statistics and …

New paper: X-Shooting ULLYSES: Massive Stars at low metallicity: II. DR1: Advanced optical data products for the Magellanic Clouds

Paper II of the XShootU collaboration is finally accepted at A&A! That is a cornerstone paper for the collaboration since it presents the analysis of the observations and provides the final scientific products with which the whole collaboration (and everybody else) can work with. X-Shooting ULLYSES: Massive Stars at low …

New paper: Investigating episodic mass loss in evolved massive stars: I. Spectroscopy of dusty massive stars in ten southern galaxies

A paper that collectively presents the results from our intensive observing campaign in the ASSESS project, focusing on the southern galaxies (a forthcoming paper will deal with the northern ones). Investigating episodic mass loss in evolved massive stars: I. Spectroscopy of dusty massive stars in ten southern galaxies A.Z. Bonanos, …

How does the distance affects the stars we see?

With increasing distance fainter stars, and therefore those of lower luminosity, older populations, become less observable. This means that with increasing distance we actually probe different parts of a Color-Magnitude diagram (CMD), which mainly consists of the brightest and more evolved massive stars. This is best shown in this figure …

New paper: Introducing the ASSESS project: Episodic Mass Loss in Evolved Massive Stars – Key to Understanding the Explosive Early Universe

This is the paper that describes the ASSESS project for which I have been working since 2018 ! Introducing the ASSESS project: Episodic Mass Loss in Evolved Massive Stars – Key to Understanding the Explosive Early Universe A.Z. Bonanos, G. Maravelias, M. Yang, F. Tramper, S. de Wit, E. Zapartas, …

Contributions to the 16th Hellenic Astronomical Conference

Between 26-28 of July (2023), I managed to participate in-person the 16th Hellenic Astronomical Conference, held in Athens. I personally contributed with one talk and one poster (long gone the days that I would submit two talks!), which was part of the ASSESS group’s contribution with another two talks, and …