Aims. We search for very small-diameter galactic planetary nebulae (PNe) representing the earliest phases of PN evolution. The IPHAS catalogue of Ha-emitting stars provides a useful basis for this study since all sources present in this catalogue must be of small angular diameter. Methods. The PN candidates are selected based on their location in two colour-colour diagrams: IPHAS (Z Ha) vs. (Z ...

We present the results of our investigation of three samples kinematically representative of the thin and thick disks and the Hercules stream using the catalogue of Soubiran & Girard (2005). We have observed abundance trends and age distribution of each component. Our results show that the two disks are chemically well separated, they overlap greatly in metallicity and both show parallel decrea...

Spectacular images of colliding galaxies like the "Antennae", taken with the Hubble Space Telescope, have revealed that a burst of star/cluster formation occurs whenever gas-rich galaxies interact. The ages and locations of these clusters reveal the interaction history and provide crucial clues to the process of star formation in galaxies. We propose to carry out state-of-theart numerical simul...

The problem of real-time, on-board star pattern identification is considered which must precede any spacecraft attitude estimation algorithm based on measured line of sight directions to stars. Following the use of the search-less k-vector method[1, 2] to access feasible candidate stars, a tiered logical structure is introduced in which inter-star angles for pairs, triples and general elementar...

ABSTRACT We present the Heraklion Extragalactic Catalogue, or HECATE, an all-sky value-added galaxy catalogue, aiming to facilitate and future multiwavelength multimessenger studies in local Universe. It contains 204 733 galaxies up a redshift of 0.047 (D${\lesssim }200\, \text{Mpc}{}$), it is >50 per cent complete terms B-band luminosity density at distances 0–170 Mpc range. By incorpor...

We investigate the star cluster system in the starburst galaxy NGC 7673 using archival Hubble Space Telescope WFPC2 broad-band images. For the first time we are able to examine the internal structures of the prominent optical clumps in this galaxy. The clumps are composed of young stars, 16− 33% of which are in bright star clusters. We identify 268 star cluster candidates in both the F555W and ...

The AKARI FU-HYU mission program carried out mid-infrared imaging of several well studied Spitzer fields preferentially selecting fields already rich in multi-wavelength data from radio to X-ray wavelengths filling in the wavelength desert between the Spitzer IRAC and MIPS bands. We present the initial results for the FU-HYU survey in the GOODS-N field. We utilize the supreme multiwavelength co...