Astronomy Archive

It is exciting to have a new machine, such the Lenovo Thinkpad X-1, but the process for setting it up can be a bit tedious. So this is a small guide what worked or didn’t through my small experience in installing Debian linux. [Just for the fun of it I proceeded with the installation of […]

A new outburst of the yellow hypergiant star Rho Cas Michaela Kraus, Indrek Kolka, Anna Aret, Dieter H. Nickeler, Grigoris Maravelias, Tõnis Eenmäe, Alex Lobel, Valentina G. Klochkova Yellow hypergiants are evolved massive stars that were suggested to be in post-red supergiant stage. Post-red supergiants that evolve back to the blue, hot side of the […]

Building upon our previous ATel #12224 we managed to obtain an optical spectrum of the counterpart. The full text follows: ATel #12237; G. Maravelias (NOA), V. Antoniou (TTU/SAO), K. Boutsia (LCO), A. Zezas (UoC/SAO), A. Z. Bonanos (NOA), F. Haberl (MPE), D. Hatzidimitriou (UoA/NOA) on 21 Nov 2018; 23:36 UT / In ATel #12224 we […]

The ATel #12224 was released on 17 Nov 2018 (19:01 UT) regarding the identification of the proposed optical counterpart to the source XTE J0052-723 (SXP 4.78; Swift J005139.2-721704) as an Hα emitting OB star. The full text follows. ATel #12224; G. Maravelias (NOA), V. Antoniou (TTU/SAO), A. Zezas (UoC/SAO), A. Strantzalis (UoA), D. Hatzidimitriou (UoA), […]

During the XXXth General Assembly of the International Astronomical Union (in Vienna, Austria) I participated in a number of different meetings. In particular: 1. A poster at the IAU Focus Meeting FM14 on IAU’s role on global astronomy outreach, the latest challenges and bridging different communities (August 23, 2018): “A paradigm to develop new contributors […]

The second week of the XXXth GA started very early actually as they were actually 3 plenary talks of the IAU 346 Symposium on “High-mass X-ray binaries: illuminating the passage from massive binaries to merging compact objects” (which actually deserves a post of its own, if I ever manage to make…). After that, we had […]

On the previous weekend (October 13-14, 2018) the 11th Free and Open Source Software Communities Meeting was held in Heraklion of Crete (Greece). This is the Greek conference of the communities that develop free and open source software (such as Mozilla, Fegora, etc.). Although the meeting focuses on programmers and students it is open to […]

In Zickgraf et al. 1989 (A&A, 220, 206) there is a comment on the density of the disk around the supergiant LHA 115-S 18. In Table 1 they provide (following Waters 1986) the mean particle density at r=R* for a number of sources: 3.2 x 1012, 2.6 x 1012, 4.6 x 1012, 1.7 x 1012 […]

Today it was my first day at the new job! It will be based at the Institute for Astronomy, Astrophysics, Space Applications and Remote Sensing (IAASARS) of the National Observatory of Athens (Greece). I will be working with Alceste Bonanos, along with Ming Yang and Frank Tramper, in a project related to the “Episodic Mass […]

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The XXXth General Assembly of the IAU is held in Vienna, Austria, from Aug 20 to 31, 2018. The first week is finished now and tomorrow the second starts. It is the biggest convention I have been so far with almost 3000 attendees, from all around the world literally. If I was to use only […]