Search Publications
Population Synthesis in Starburst Galaxies - MARKARIAN:710
Mas-Hesse, J. M.; Kunth, D.; Arnault, P.
Evolutionary population synthesis models have been built to study the properties of the starforming processes taking place in starburst regions. BothZ⊙ andZ⊙/10 stellar evolutionary tracks have been used to take into account that starburst galaxies are generally metal deficient. A very small time step allows us to follow the …
A Simple Population Synthesis Model for the Continuum of the SEYFERT-2 Galaxy MARKARIAN:348
Terlevich, Roberto; Terlevich, Elena; Diaz, Angeles I. +1 more
The spectral energy distribution of the Seyfert type-2 galaxy Mk 348 is analyzed based on IUE observations and published data. It is found that most of the optical and near-IR flux comes from the underlying galaxy bulge population. The rest of the emission can be fitted by a power law of the formFv ∼v‑α with α=0.6. In order t…
Some Considerations of the Non-Detection of Interstellar li and B Towards the Supernova 1987A
Molaro, P.; Vladilo, G.
A very low upper limit of 0.15 mÅ for the interstellar λ6707 Å LiI line has been recently derived towards the SN1987a by Baade and Magain (1988). This value corresponds toN(Li)<1.4×1011 cm‑2 and gives [Li/H]<5.4×10‑11 assumingN(HI)=2.6×1021 cm‑2 for the hydrogen column density in the LMC…
Chemical Abundances from B-Stars in the Magellanic Clouds
Stahl, O.; Wolf, B.; Reitermann, A. +1 more
We observed near-Main-Sequence B-stars in the Magellanic Clouds with the 3.6 m telescope and CASPEC at La Silla. We obtained spectra of high resolution and high S/N-ratio. The stars are members of the blue globular clusters NGC 1818 (LMC) and NGC 330 (SMC). The spectra are used for differential abundance analyses using ι HER as galactic reference …
The Local Interstellar Medium - a Test-Bed for the Galactic Interstellar Medium
Molaro, P.; Beckman, J. E.; Vladilo, G. +1 more
We outline a method to explore the column density of the Local Interstellar Medium (LISM) using absorptions in the resonance H and K lines of MgII. The intrinsic strengths of these lines in the temperature and density conditions prevailing in warm clouds (Teff<104 K) in the LISM allows them to be used to explore many lines…
Ultraviolet studies of the interstellar gas in the direction of the stars AE Aur (09.5V) andθ 2 Ori A (09.0V)
Avcioglu, Kamuran; Mentese, H. Huseyin
We have studied high-resolution SWP spectra of AE Aur andθ2 Ori A, obtained from the International Ultraviolet Explorer Satellite; and derived curve of growth and column densities ofCII,CII*, AlII, SiII, SiII*,SII, CrII, FeII, NiII, and ZnII. It has been possible to fit these ions on one empirical curve of growth w…
The ultraviolet spectrum of the binary system KS Persei (HD 30353)
Tektunali, H. Gokmen
Nine high- and low-resolution IEU spectra at different orbital phases during different cycles, of the hydrogen-poor single-lined spectroscopic binary KS per (HD 30353) have been studied. The near-UV spectrum is characterized by the presence of several lines of once ionized metals which show the same orbital RV shifts observed in the visual range. …