Search Publications
HST observations of nuclear stellar disks
Jaffe, W.; Krajnović, D.
We present observations of four nearby early-type galaxies with previously known nuclear stellar disks using two instruments on-board the Hubble Space Telescope. We observed NGC 4128, NGC 4612, and NGC 5308 with the Wide Field Planetary Camera 2, and the same three galaxies, plus NGC 4570, with the Space Telescope Imaging Spectrograph. We have det…
Photometric estimates of stellar masses in high-redshift galaxies
Berta, S.; Fritz, J.; Franceschini, A. +2 more
We present a new tool for the photometric estimate of stellar masses in distant galaxies. The observed source spectral energy distributions are fitted by combining sets of various simple stellar populations, with different normalizations and different amounts of dust extinction, for a given (Salpeter) IMF. This treatment gives us the best flexibil…
Observations of the Pulsating White Dwarf G 185-32
Mazeh, T.; Hansen, C. J.; Kepler, S. O. +32 more
We observed the pulsating hydrogen atmosphere white dwarf G 185-32 with the Whole Earth Telescope in 1992. We report on a weighted Fourier transform of the data detecting 18 periodicities in its light curve. Using the Hubble Space Telescope Faint Object Spectrograph time resolved spectroscopy, and the wavelength dependence of the relative amplitud…
Subgiants as probes of galactic chemical evolution
Gustafsson, B.; Edvardsson, B.; Thorén, P.
Chemical abundances for 23 candidate subgiant stars have been derived with the aim at exploring their usefulness for studies of galactic chemical evolution. High-resolution spectra from ESO CAT-CES and NOT-SOFIN covered 16 different spectral regions in the visible part of the spectrum. Some 200 different atomic and molecular spectral lines have be…
A young and complex binary star - HD 144432
de Winter, D.; van den Ancker, M. E.; Bopp, B. W. +1 more
The southern emission-line star HD 144432 has received considerable attention due to its relative brightness (V ∼ 8.17), its late spectral type (late A-type or perhaps early F) and its relative isolation from a bona-fide active star formation region. We present new imaging and spectroscopic data of this star, which in the past has been classified …
A second glance at SN 2002ap and the M 74 field with XMM-Newton
Pian, E.; Soria, R.; Mazzali, P. A.
We have re-observed the field of M 74 in January 2003 with XMM-Newton, 11 months after the X-ray detection of SN 2002ap. From a comparison of the two XMM-Newton observations we obtain more accurate values for the X-ray luminosity and colours of the source five days after the event, and a limit on its decline rate. We compare its X-ray behaviour (p…
W Hya: Molecular inventory by ISO-SWS
Waters, L. B. F. M.; Feuchtgruber, H.; Justtanont, K. +2 more
Infrared spectroscopy is a powerful tool to probe the inventory of solid state and molecular species in circumstellar ejecta. Here we analyse the infrared spectrum of the Asymptotic Giant Branch star W Hya, obtained by the Short and Long Wavelength Spectrometers on board of the Infrared Satellite Observatory. These spectra show evidence for the pr…
ISOCAM observations in the Lockman Hole . II. The 14.3 µm deep survey: Data reduction, catalogue and source counts
Elbaz, D.; Rodighiero, G.; Cesarsky, C. +3 more
We present a new analysis of the ISOCAM 14.3 µm deep survey in a 20 × 20 square arcmins area in the Lockman Hole. This survey is intermediate between the ultra-deep surveys and the shallow surveys in the ELAIS fields. The data have been analyzed with the method presented by Lari et al. (\cite{Lar01}). We have produced a catalogue of 283 sour…
X-ray spectroscopy of the W UMa-type binary VW Cephei
Gondoin, P.
VW Cephei, a W UMa-type binary system, was observed twice with a four week interval in October 2002 by the XMM-Newton space observatory. During the first observation, the source appears to be quiescent. A shallow dip in the X-ray light curve during primary eclipse indicates that the primary and secondary stars both contribute to the X-ray emission…
Integral field spectroscopy of extended Lyα emission from the DLA galaxy in Q2233+131
Jahnke, K.; Popović, L. Č.; Christensen, L. +5 more
This paper presents observations of an extended Lyman-α emission nebula surrounding the galaxy responsible for the Damped Lyman-α Absorption (DLA) line in the spectrum of the quasar