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Metallicity and radial velocity of the second parameter globular cluster Terzan 1 in the galactic bulge
Bica, E.; Barbuy, B.; Ortolani, S. +3 more
Terzan 1 is the globular cluster with closest projection relative to the Galactic center. We report radial velocities and metallicities of 17 stars in order to investigate their membership in the cluster. From the 11 probable members of Terzan 1, a radial velocity of vr = 114 +/- 14 km s-1 is obtained. For this sample an inte…
The EIT coil-like structure in the March 20, 2000 eruptive prominence
Karlický, M.; Šimberová, S.
The evolution of the March 20, 2000 prominence eruption observed in the 195 Å(EIT/SOHO), Hα , (MDI/SOHO), 1-3 GHz radio and hard X-ray (BATSE) was analyzed. A unique EIT coil-like structure with a hot core, indicating an electric current, was observed at the beginning of the prominence eruption. This structure with about 5 turns was associated wit…
Chemically distinct nuclei and circumnuclear rings in lenticular galaxies NGC 4429 and NGC 7013
Sil'chenko, O. K.; Afanasiev, V. L.
The central regions of the regular lenticular galaxies NGC 4429 and NGC 7013 have been studied with the Multi-Pupil Field (Fiber) Spectrograph (MPFS) of the 6 m telescope of the Special Astrophysical Observatory RAS (Nizhnij Arkhyz, Russia) in two spectral ranges, the blue one including the strong absorption lines Mg I and Fe I and the red one inc…
Astrometry of the stellar image of U Her amplified by the circumstellar 22 GHz water masers
Vlemmings, W. H. T.; van Langevelde, H. J.; Diamond, P. J.
The 22 GHz H2O masers in the circumstellar envelope of the Mira variable star U Her have been observed with MERLIN using a phase referencing technique to determine accurate astrometric positions. The positions were compared with the optical positions obtained with the Hipparcos satellite to an accuracy of 18 mas. The absolute radio posi…
A photometric study of the recently discovered eclipsing binary V899 Herculis
Bulut, İ.; Demircan, O.; Soydugan, F. +4 more
The radial velocity and UBV light curves of V899 Her as found in the literature were studied for the first time to obtain the orbital parameters and geometry of the system. The solutions obtained by using the Wilson-Devinney code reveal an over-contact system with a fill-out factor of 23.7%. This solution is only possible with a large amount of th…
The 3 mu m spectrum of R Doradus observed with the ISO-SWS
Ryde, N.; Eriksson, K.
We have modeled the 2.6-3.7 µm spectrum of the red semiregular variable R Doradus observed with the Short-Wavelength Spectrometer on board the Infrared Space Observatory. The wavelength resolution of the observations varies between R ~ 2000-2500. We have calculated a synthetic spectrum using a hydrostatic model photosphere in spherical geome…
FUSE observations towards the pole-on Be star HR 5223
Frémat, Y.; Zorec, J.; Ferlet, R. +5 more
New spectra have been obtained for the pole-on Be star HR 5223 (HD 120991) using the Far Ultraviolet Satellite Explorer (FUSE). We give a complete description of the far-UV spectral range (920 to 1180 Å). The spectra are affected by strong blends with interstellar lines and molecular bands that also significantly lower the energy distribution of t…
Infrared emission towards SN 1987A 11 years after outburst: Measurements with ISOCAM
Völk, H. J.; Tuffs, R. J.; Fischera, Jg.
We present measurements of the mid-infrared (MIR) emission from SN 1987A, made using the Infrared Space Observatory (ISO) 11 years after outburst. They are the only late epoch detections of this source in the thermal IR regime. The position of the source, determined from an offset to an IR-emitting star, suggests that the emission is associated wi…
New binary stars discovered by lunar occultations. VI.
Stecklum, B.; Richichi, A.; Calamai, G.
We present additional results from our ongoing lunar occultation program. Observations are presented here for a total of seventeen sources, for the majority of which one or two new companions are detected. The sample comprises mostly field stars, spanning a large range of spectral types. Two infrared objects without optical counterpart are also in…
Models for solar magnetic loops. I. A simple theoretical model and diagnostic procedure
Landini, M.; Landi, E.
In the present paper the quasi-static model of Landini & Monsignori Fossi (\cite{Landini75}) for coronal loops is improved and a simple diagnostic procedure is developed to compare the most important physical properties of the model with a set of spectral observations of loops such as those obtained by the CDS and SUMER instruments on SOHO. Th…