We resolve stars of the nearest giant elliptical galaxy NGC 5128 using VLT with FORS1 and ISAAC. We construct deep U , V and Ks color-magnitude and color-color diagrams in two different halo fields (in the halo and in the northeastern diffuse shell). In the outer, shell field, at ∼ 14 kpc from the center of the galaxy, there is a significant recent star formation with stars as young as 10 Myr, ...

star identification is one of the most important stages in attitude determination with star trackers. this can be performed using matching algorithms between observed stars and a master star catalogue. the main challenge in this approach is to provide a fast and reliable identification algorithm that is sufficiently robust in different pointing views of the star tracker optical system in the sp...

We report the detection of a giant planet orbiting G-type star HD 167768 from radial velocity measurements using HIgh Dispersion Echelle Spectrograph (HIDES) at Okayama Astrophysical Observatory (OAO). has mass $1.08_{-0.12}^{+0.14} M_{\odot}$, radius $9.70_{-0.25}^{+0.25} R_{\odot}$, metallicity $\rm{[Fe/H]}=-0.67_{-0.08}^{+0.09}$, and surface gravity $\log g = 2.50_{-0.06}^{+0.06}$. The is wa...

Multiple stellar populations (MPs) representing star-to-star light-element abundance variations are common in nearly all ancient Galactic globular clusters. Here we provide the strongest evidence yet that populous, ~ 1.7 Gyr-old Large Magellanic Cloud cluster NGC 2173 also exhibits variations. Thus, our results suggest is youngest for which MPs have been confirmed to date. Our conclusion based ...

ABSTRACT SU Lyn is a binary system composed of white dwarf and red giant star. Although it known to be bright variable at X-ray wavelengths, the optical counterpart source appeared as single without prominent emission lines. Because lack features typical for interacting systems, was classified hidden symbiotic We present results monitoring system. While did not show substantial photometric vari...