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 news

Traveling:

Currently I am back home. No travels arrangements in the near future!

Teaching/Mentoring:
  • Mentoring Stella Avgousti on her MSc thesis (since Sep 2022).
Recent Publications:

Latest publications

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"
New paper: Zapartas et al. 2024: The effect of mass loss in models of red supergiants in the Small Magellanic Cloud:

New paper: Zapartas et al. 2024: The effect of mass loss in models of red supergiants in the Small Magellanic Cloud:

During the ASSESS project we carried out tons of observations and careful analysis in order to identify mass-losing evolved stars. At the same time though,...
Read More "New paper: Zapartas et al. 2024: The effect of mass loss in models of red supergiants in the Small Magellanic Cloud:"
New paper: Shenar et al. 2024: Binarity at LOw Metallicity (BLOeM): I. a spectroscopic VLT monitoring survey of massive stars in the SMC

New paper: Shenar et al. 2024: Binarity at LOw Metallicity (BLOeM): I. a spectroscopic VLT monitoring survey of massive stars in the SMC

This is the first paper of the "Binarity at LOw Metallicity (BLOeM)" collaboration which targets to obtain spectra for about 1000 massive stars in the...
Read More "New paper: Shenar et al. 2024: Binarity at LOw Metallicity (BLOeM): I. a spectroscopic VLT monitoring survey of massive stars in the SMC"
New paper: de Wit et al. 2024: Investigating episodic mass loss in evolved massive stars: II. Physical properties of red supergiants at subsolar metallicity

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...
Read More "New paper: de Wit et al. 2024: Investigating episodic mass loss in evolved massive stars: II. Physical properties of red supergiants at subsolar metallicity"
New paper: Establishing a mass-loss rate relation for red supergiants in the Large Magellanic Cloud

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...
Read More "New paper: Establishing a mass-loss rate relation for red supergiants in the Large Magellanic Cloud"
New paper: X-Shooting ULLYSES: Massive Stars at low metallicity: II. DR1: Advanced optical data products for the Magellanic Clouds

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

blog

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

New paper: Zapartas et al. 2024: The effect of mass loss in models of red supergiants in the Small Magellanic Cloud:

During the ASSESS project we carried out tons of observations and careful analysis in order to identify mass-losing evolved stars. At the same time though, Manos Zapartas was taking advantage of the new red supergiant mass loss fits we managed and put them into some perspective with theory. Equipped with …

Astronomy | Publications

New paper: Shenar et al. 2024: Binarity at LOw Metallicity (BLOeM): I. a spectroscopic VLT monitoring survey of massive stars in the SMC

This is the first paper of the “Binarity at LOw Metallicity (BLOeM)” collaboration which targets to obtain spectra for about 1000 massive stars in the SMC! Apart from being an extremely interesting project it really matches many of the sources I have been working with in the SMC. So perfect …

Astronomy | Publications

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, …

Astronomy | Publications

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, …

Astronomy | Publications

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 …

Astronomy | Publications