Search Publications
Spectroscopic confirmation of a white dwarf companion to the B star 16 Dra
Barstow, M. A.; Burleigh, M. R.
Using an Extreme Ultraviolet Explorer (EUVE) spectrum, we confirm the identification of a white dwarf companion to the B9.5V star 16 Dra (HD150100), and constrain its surface temperature to lie between 29,000 K and 35,000 K. This is the third B star + white dwarf non-interacting Sirius-type binary to be confirmed, after y Pup (HR2875, HD59635) and…
Vertical motions in the disk of NGC 5668 as seen with optical Fabry-Perot spectroscopy
Battaner, E.; Jiménez-Vicente, J.
We have observed the nearly face-on spiral galaxy NGC 5668 with the TAURUS II Fabry-Perot interferometer at the William Herschel Telescope using the Hα line to study the kinematics of the ionized gas. From the extracted data cube we construct intensity, velocity and velocity dispersion maps. We calculate the rotation curve in the innermost 2 arcmi…
Kinematics and morphology of the narrow-line region in the Seyfert galaxy NGC 1386
Dietrich, M.; Wagner, S. J.; Rossa, J.
We present a high spatial and spectral resolution 2-D echelle spectrogram of the Narrow-Line Region in the Seyfert 2 galaxy
On the relationship between shift and intensity of ultraviolet lines in coronal holes and the quiet Sun
Solanki, S. K.; Schühle, U.; Rüedi, I. +1 more
We study the relationship between wavelength shifts and intensities of chromospheric, transition-region and coronal ultraviolet emission lines in polar coronal holes and in the normal quiet Sun using SUMER data. Within coronal holes almost all the lines showing the network and formed above 30 000 K show a correlation between blueshifts and brightn…
Long-term photometry of the Wolf-Rayet stars WR 137, WR 140, WR 148, and WR 153
Altmann, M.; Panov, K. P.; Seggewiss, W.
In 1991, a long term UBV-photometry campaign of four Wolf-Rayet stars was started using the 60 cm telescope of the National Astronomical Observatory Rozhen, Bulgaria. Here we report on our observational results and discuss the light variations. The star WR 137 was observed during 1991 - 1998. No indications of eclipses were found, though random li…
Clustering of galaxies at faint magnitudes
Freudling, W.; Fynbo, J. U.; Möller, P.
Significant uncertainties exist in the measured amplitude of the angular two-point correlation function of galaxies at magnitudes I~26 and fainter. Published results from HST and ground-based galaxy catalogs seem to differ by as much as a factor of 3, and it is not clear whether the correlation amplitude as a function of magnitude increases or dec…
New infrared object in the field of the SMC cluster NGC 330
Sauvage, M.; Tanabé, T.; Vansevičius, V. +1 more
We report ISO (Infrared Space Observatory) observations of a new infrared source discovered in the vicinity of the young populous cluster NGC 330 in the Small Magellanic Cloud. The object was observed with ISOCAM at 4.5, 6.75 and 11.5 mu m and shows a prominent mid-infrared excess, indicating the presence of a dust shell. The available observation…
The Hipparcos, Tycho, TRC, and ACT catalogues --- A whole sky comparison of the proper motions
Hoogerwerf, R.; Blaauw, A.
We present a whole sky comparison of the proper motions contained in the Hipparcos Catalogue, the Tycho Catalogue, the Tycho Reference Catalogue (TRC), and the Astrographic Catalogue plus Tycho Reference Catalogue (ACT). The catalogues are compared in the 20 declination zones defined by the original Carte du Ciel project. We find that (1) the prop…
The nature of the DAB white dwarf HS 0209+0832
Reimers, D.; Wolff, B.; Jordan, S. +1 more
The DAB white dwarf
The nearby M-dwarf system Gliese 866 revisited
Franz, O. G.; Leinert, Ch.; Jahreiß, H. +3 more
We present an improved orbit determination for the visual pair in the M-dwarf triple system