The following paper is the result of a tedious task that my good friend Manos Kardasis undertook over the last two+ years. He noticed the presence of this (relatively newly discovered) feature in Venus and collected images from amateur observers worldwide to study in detail the discontinuity and constrain some …
When creating finding charts for observations with the OSIRIS instrument on GTC you need to check the field-of-view (fov). With the Aladin Sky Atlas it is easy to download an image and overplot an instrument footprint (Edit > Load instrument footprint). Although there is a selection of instruments, by default …
Revisiting the evolved hypergiants in the Magellanic Clouds Kourniotis, M.; Kraus, M.; Maryeva, O.; Borges Fernandes, M.; Maravelias, G. The massive stars that survive the phase of red supergiants (RSGs) spend the rest of their life in extremity. Their unstable atmospheres facilitate the formation and episodic ejection of shells that …
This is a paper that I finally managed to complete. Starting back in 2016 we looked into the light curves for ρ Cas to identify potential correlations with its latest outburst in 2013, but not all data made it through the final paper (Kraus et al. 2019). Given this first …
In the old days observations were not coming in such convenient formats like machine readable tables or though Vizier catalogs. There were written in text within the papers. So, for today’s standards it is a bit frustrating to find data in this format when you need them. The way to …
The week 1-5 of November 2021, I (virtually) participated to the IAU Symposium 366 on the origin of outflows in evolved stars. I had the opportunity to present our recently submitted work on a photometric machine-learning classifier.
This paper is a result of an attempt that started way back during my PhD thesis actually. back then in early 2010’s we started investigating a way to automate the spectral classification of Be X-ray binaries. The problem with these sources is that due to the strong emission in the …
During the 15th Hellenic Astronomical Conference I had the opportunity to present advances in two major topics: I have also contributed to the following works:
Three poster contributions during EAS 2021 with the following … statistics: all of them on massive stars, two within the framework of the ASSESS project, and two on machine-learning applications. 1. Applying machine-learning methods to build a photometric classifier for massive stars in nearby galaxies Grigoris Maravelias, Alceste Bonanos, Frank …