Search Publications
Precise photometry and astrometry in the core of the globular cluster NGC 6121 using PSF-R techniques
Tolstoy, Eline; Milli, Julien; Fiorentino, Giuliana +6 more
Precise stellar photometry and astrometry require the best possible modelling of the point spread function (PSF). To date, the best performances have been obtained when building the PSF a posteriori, meaning directly from the image of dense stellar fields, by exploiting the fact that each star represents a different realisation of the same PSF. Th…
Subsurface ice on comet 67P is softer than candyfloss
Crane, Leah
Report from ILEWG Task Groups: Science, Technology, human aspects, roadmaps, socio-economics, young lunar explorers, MoonVillage, MoonMars synergies, EuroMoonMars, ArtMoonMars
Foing, Bernard
ILEWG has been organising since 1994 ICEUM International Conferences on Exploration & Utilisation of the Moon with published proceedings, and where community declarations have been prepared and endorsed by community participants. ILEWG has co-organised and co-sponsored lunar sessions at EGU, COSPAR, EPSC.ILEWG task groups include science, tech…
Herbig-Haro flows around the BBWo 192E (GM 1-23) nebula
Bally, J.; Rastorguev, A. S.; Movsessian, T. A. +2 more
Looking for evidence of recent star formation, we have studied a small comet-shaped reflection nebula, known as BBWo 192E (GM 1-23), which is located in the dark cloud SL 4 in the Vela Molecular Ridge cloud C, and a young infrared cluster embedded into the nebula. We obtained the images of BBWo 192E in Hα and [S II] lines and in a Sloan Digital Sk…
Kinematical structure of open clusters within 1 kpc by Gaia
Elsanhoury, W. H.
The work is based on proper motions, radial velocities, and absolute magnitudes of 56 open clusters located within 1 kpc. We classify those as a function of their distances into five groups (Freedman and Diaconis's rule) as well as a double frequency table may be achieved. For these groups, we calculated their velocity ellipsoid parameters VEPs, e…
Ammonium salts on comet 67P
Smith, Keith T.
Erratum: 'XMM-newton large program on SN1006 - II: Thermal emission' (2016, MNRAS, 462, 158)
Vink, Jacco; Miceli, Marco; Bocchino, Fabrizio +2 more
Comparative study of activity of the near-parabolic orbitcomet C/1977 R1 (Kohler)
de Almeida, A. A.; Sanzovo, G. C.; de Araújo, L. F.
Kohler is considered a case of young, nearly parabolic comet. In this work we deduce, semi-empirically, water and hydroxyl production rates from the photometric observations of this comet taken from the Archive of Photometric Data on Comets and British Astronomical Society archives. Our results are being compared with those obtained from radio obs…
Gaia DR2 and Serbian-Bulgarian investigations
Damljanović, Goran
On April $25^{th}$ 2018, the second release of the Gaia catalog (DR2) appeared. It is based on 640 days of Gaia satellite observations; GAIA means Global Astrometric Interferometer for Astrophysics. The observing period was August $22^{nd}$ 2014 - May $23^{rd}$ 2016 (1.75 yr or 21 months with some interruptions). The reference epoch is J2015.5 . T…
An AGB Star with a Thick Circumstellar Shell
Wang, Lifan; Durré, Mark; Mould, Jeremy +1 more
The Asymptotic Giant Branch is the terminal phase of red giant evolution with timescales of millions of years and a total mass lost from the star that is a significant fraction of the initial mass. Investigation of one of these stars, WISEA J173046.10-344455.5, a kpc in the direction of the center of the Galaxy, reveals a cool oxygen rich star wit…