CoBiToM Project — II: Evolution of contact binary systems close to the orbital period cut-off
Ultra-short orbital period contact binaries (Porb
Discovery of an optical cocoon tail behind the runaway HD 185806
Studies on the circumstellar structures around evolved stars provide vital information on the evolution of the parent star and the properties of the local interstellar medium. In this work, we present the discovery and characterization of an optical cocoon tail behind the star HD 185806. The cocoon apex emission is puzzling, as it is detected in the infrared but shows no signal in the optical wavelength.
Laser optical links were made between the Aristarchos telescope and the AlphaSat telecommunication satellite
Between June 26 and July 2, laser optical links were made between the Aristarchos telescope and the AlphaSat telecommunication satellite. The team visiting from ESA worked with the Helmos Observatory team to complete several experiments in which the telescope not only recorded the beam from AlphaSat but also the quality and characteristics of the signal.
Call for proposals – 2022
The next proposal deadline for the observing period July 1- October 31, 2022 is May 6, 2022 (23:59 Local Time).
Deep optical study of the mixed-morphology supernova remnant G 132.7+1.3 (HB3)
We present optical ccd images of the large supernova remnant (SNR) G132.7 + 1.3 (HB3) covering its full extent for the first time, in the emission lines of H α+ [N II], [S II] and [O III], where new and known filamentary and diffuse structures are detected. These observations are supplemented by new low-resolution long-slit spectra and higher-resolution images in the same emission lines. Both the flux-calibrated images and spectra confirm that the optical emission originates from shock-heated gas since the [S II]/H α > 0.4.
Constraints on the structure and seasonal variations of Triton’s atmosphere from the 5 October 2017 stellar occultation and previous observations
A stellar occultation by Neptune's main satellite, Triton, was observed on 5 October 2017 from Europe, North Africa, and the USA. We derived 90 light curves from this event, 42 of which yielded a central flash detection. We aimed at constraining Triton's atmospheric structure and the seasonal variations of its atmospheric pressure since the Voyager 2 epoch (1989). We also derived the shape of the lower atmosphere from central flash analysis.
CoBiToM Project — II: Evolution of contact binary systems close to the orbital period cut-off
Ultra-short orbital period contact binaries (Porb
Additional equipment and tests in the framework of ScyLight project
After the successful installation of the equipment of the ScyLight program last July, the ESA team visits again the observatory of Helmos where in collaboration with the staff of IAASARS, they continue the tests with the telescope “Aristarchos”.
First deep images catalogue of extended IPHAS PNe
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 ...
First light for the ESA ScyLight program
The European Space Agency (ESA) has decided to build the first ground station of the ambitious ARTES ScyLight program next to the Helmos Observatory in Achaia, the National Observatory of Athens’ largest research center.