Archive for 2015

Winter is … here!

By grigoris | Filed in Astronomy

Winter-time observations in Ondrejov are bad and good at the same time. ‘Bad’ since the weather can be really nasty (clouds, humidity, rain, snow, …) so you can get nothing all night long or something for a short amount of time (‘spending’ a lot of time just waiting of course). On the other hand they […]

The first scientific results regarding the Pluto system as observed from New Horizons have been published in Science [1]. It is impressive to see direct images and maps of such distant worlds. More remarkable is the complex geology and geomorphology which characterize both Pluto and Charon. Pluto is by far a non-dead planet as resurfacing […]

Disk tracing for B[e] supergiants in the Magellanic Clouds G. Maravelias, M. Kraus, A. Aret B[e] supergiants are evolved massive stars with a complex circumstellar environment. A number of important emission features probe the structure and the kinematics of the circumstellar material. In our survey of Magellanic Cloud B[e] supergiants we focus on the [OI] […]

The equivalent of 1 erg

By grigoris | Filed in Astronomy

A very common unit of energy in Astronomy is erg. There are stellar sources that emit up to 1040 erg/s (or even more for galaxies). But, how could we understand “how much” erg is? An interesting and funny example is given in the Wikipedia [1]: “An erg is approximately the amount of work done (or […]

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June 2015 has been quite busy as I participated in two conferences: The Physics of Evolved Stars (Nice, France; June 8-12, 2015) – poster contribution Title: “Disk tracing for B[e] supergiants in the Magellanic Clouds” Abstract: “The B[e] supergiants are an important short-lived transition phase in the life of massive stars, in which enhanced mass-loss […]

Back to (my) school!

By grigoris | Filed in Astronomy

On Thursday 14th of May 2015 I had the unique opportunity to give a talk about Astronomy at the high school I graduated from in Aigaleo (Athens, Greece). As I have moved away from Aigaleo since 2007 and my visits in Athens are scarce the least, it is difficult to think of such an event […]

Even though New Horizons has just passed from Pluto and sent us some magnificent images, it didn’t manage to uncover all the details of Pluto. Luckily, PEBLO give us another great view of Pluto:

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Baffled on how to properly acknowledge a code/software, web-service, database, or facility/observatory? And more important how to find the proper citations? A tool of rescue is the Acknowledgment Generator [1] which makes (too) easy to create these necessary sentences for the acknowledgment section, along with the appropriate citations, by simply ticking the boxes you are […]

Every three months there is a meeting among the departments of the Astronomical Institute. Each director presents some news in short, followed by a talk from a member of that department. At the Summer Interdepartmental Meeting of this year (held on Monday, 1st of June, 2015, in Ondrejov) I was “representing” the Stellar department, talking […]

New domain name !

By grigoris | Filed in Astronomy

The new domain is official: maravelias.info ! Please update your bookmarks (if you have any…!). All the content is there, but if something is missing or (too obviously) broken let me know. But why change it? When I decided to self-host my site and use a domain I though that a nice name would be […]