Search Publications
Coronal oscillation above a supergranular cell of the quiet Sun chromospheric network?
Peter, H.; Gontikakis, C.; Dara, H. C.
We have detected an oscillation in the low corona, using a raster of the SUMER EUV spectrograph in the Ne viii, 770 Å line formed at about 700 000 K. The oscillation was found in the Ne viii Doppler map above the interior of a supergranular cell of the chromospheric network in the quiet Sun, while it is absent in line radiance. The photospheric ma…
Early BVRcIc imaging and the discovery of the optical afterglow of GRB 041218
Fukazawa, Y.; Tsunemi, H.; Torii, K.
We report early BVR_cIc imaging of the INTEGRAL GRB 041218. The observation started 129 s after the burst and a sequence of exposures in V, R_c, I_c, and B bands were repeated. The optical afterglow is detected in Rc and Ic bands while it was not detected in B and V. We find that the early afterglow deviates from a…
Orbit correction without variational equations. The orbits of Caliban, 46P/Wirtanen and 67P/Churyumov-Gerasimenko
Aksnes, K.; Grav, T.
Differential orbit correction is performed by computing an osculating orbit from observations from which the perturbations have been subtracted. No variational equations need to be integrated except to solve for non-gravitational forces. The perturbations in the observations are obtained by subtracting a two-body orbit from an integrated, perturbe…
The HeI abundance in Solar filaments
Chiuderi Drago, F.
Three filaments observed with the CDS instrument on the SOHO satellite are analysed to determine the HeI/HI ratio. The HI and Hel bound-free absorptions are the major processes responsible for the lower intensity of transition region (TR) lines observed above filaments. One of the filaments was also observed by SUMER at λ > 912 Å, thus supplyin…
HST photometry of the binary globular cluster Sersic 13N-S in NGC 5128
Minniti, D.; Funes, J. G.; Villegas, D.
Using Hubble Space Telescope archival images we resolved individual stars in two young globular clusters centered in the giant HII region Sersic 13, on the dust band of NGC 5128. We resolved 5 sources in the southern cluster and 4 sources in the northern one. The high U luminosity of these stars (-9.3 < MF336W <-7.8) added to the …
Near infrared imaging of the broad absorption line quasar BAL QSO 0134+3253
Eckart, A.; Zuther, J.
In this paper we present near infrared (NIR) imaging data of the host galaxy of the broad absorption line quasar (BALQ) at z=2.169, serendipitously found close to 3C 48 (Canalizo et al. 1998, AJ, 115, 890). The data were obtained with the ESO-VLT camera ISAAC during period 67. We find extended, rest-frame optical emission around the BALQ after sub…
Third San Juan photoelectric astrolabe catalogue (CPASJ3)
Zhao, G.; Alonso, E.; Manrique, W. T. +9 more
Resulting from the cooperation between Beijing, San Juan and La Plata Astronomical Observatories, the photoelectric astrolabe Mark II(PAII) of the Beijing Astronomical Observatory was moved and installed at the San Juan Observatory, Argentina in January, 1992 for observations of stars in the southern hemisphere. Using the data observed with the in…
The Geneva-Copenhagen survey of the Solar neighbourhood. Ages, metallicities, and kinematic properties of ∼14 000 F and G dwarfs
Pont, F.; Holmberg, J.; Nordström, B. +6 more
We present and discuss new determinations of metallicity, rotation, age, kinematics, and Galactic orbits for a complete, magnitude-limited, and kinematically unbiased sample of 16 682 nearby F and G dwarf stars. Our ∼63 000 new, accurate radial-velocity observations for nearly 13 500 stars allow identification of most of the binary stars in the sa…
Spectroscopic [Fe/H] for 98 extra-solar planet-host stars. Exploring the probability of planet formation
Santos, N. C.; Mayor, M.; Israelian, G.
We present stellar parameters and metallicities, obtained from a detailed spectroscopic analysis, for a large sample of 98 stars known to be orbited by planetary mass companions (almost all known targets), as well as for a volume-limited sample of 41 stars not known to host any planet. For most of the stars the stellar parameters are revised versi…
The 2-8 keV cosmic X-ray background spectrum as observed with XMM-Newton
Molendi, S.; De Luca, A.
We have measured the spectrum of the Cosmic X-ray Background (CXB) in the 2-8 keV range with the high throughput EPIC/MOS instrument onboard XMM-Newton. A large sample of high galactic latitude observations was used, covering a total solid angle of 5.5 square degrees. Our study is based on a very careful characterization and subtraction of the ins…