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So far NOAHelmos2Admin has created 32 blog entries.

First deep images catalogue of extended IPHAS PNe

By |2021-09-01T16:00:37+03:00August 31st, 2021|

A significative fraction of all massive stars in the Milky Way move supersonically through their local interstellar medium (ISM), producing bow shock nebulae by wind-ISM interaction. The stability of these observed astrospheres around cool massive stars challenges precedent two-dimensional (magneto-)hydrodynamical simulations of their surroundings. We present three-dimensional magneto-hydrodynamical (3D MHD) simulations of the circumstellar medium of runaway M-type red supergiant stars moving with velocity v* = 50 km s−1 . We treat the stellar wind with ...

3D MHD astrospheres: applications to IRC-10414 and Betelgeuse

By |2021-07-17T12:35:25+03:00July 12th, 2021|

A significative fraction of all massive stars in the Milky Way move supersonically through their local interstellar medium (ISM), producing bow shock nebulae by wind-ISM interaction. The stability of these observed astrospheres around cool massive stars challenges precedent two-dimensional (magneto-)hydrodynamical simulations of their surroundings. We present three-dimensional magneto-hydrodynamical (3D MHD) simulations of the circumstellar medium of runaway M-type red supergiant stars moving with velocity v* = 50 km s−1 . We treat the stellar wind with ...

Call for proposals – 2021

By |2022-01-24T12:52:52+02:00April 10th, 2021|

Call for proposals - 2021 Proposal deadline for the observing period July 1- October 31, 2021 was May 7, 2021 (23:59 Local Time). How to apply In order to apply for time to use the Aristarchos telescope please fill out the application form. Applications for observation time can only [...]

‘Ears’ formation in supernova remnants: overhearing an interaction history with bipolar circumstellar structures

By |2021-07-16T03:40:17+03:00April 1st, 2021|

A characteristic feature that is frequently found in nearby supernova remnants (SNRs) is the existence of two antisymmetric, local protrusions that are projected as two 'ears' in the morphology of the nebula. In this paper, we present a novel scenario for the 'ear' formation process,

Aristarchos Telescope Participates in the Optical Radionet Pilot (ORP) Program

By |2021-10-10T23:36:28+03:00March 23rd, 2021|

Aristarchos Telescope Participates in the Optical Radionet Pilot (ORP) Program First meeting of the Board of Directors of the new Optical Radionet Pilot program Aristarchos telescope participates in an international network of astronomical stations in the Optical Radionet Pilot program's framework to strengthen the research in Observational Astronomy. The director [...]

Edge-on boxes with X-features as parts of galactic bars – NGC 352: A direct piece of observational evidence

By |2021-07-16T03:51:20+03:00March 1st, 2021|

This paper is a contribution to the discussion about whether the X/peanut component is part of the bar, or the bar itself. Our goal is to present a clear-cut case of a barred-spiral galaxy in which all structural components (i.e. the thick and thin part of the bar and the spiral arms) can be observed in its image and their dimensions directly measured there. We obtained deep images of the nearby galaxy NGC 352, which has an ideal inclination allowing us to observe all of the parts that compose its morphology, estimate their relative sizes, and determine the topology of the luminous matter...

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