Search Publications
ISO-SWS observations of Herbig Ae/Be stars: HI recombination lines in MWC1080 and CoD -42d 11721
Benedettini, M.; Lorenzetti, D.; Nisini, B. +4 more
ISO-SWS grating spectra are obtained towards the two Herbig Ae/Be stars MWC1080 and CoD -42(deg) 11721, showing hydrogen recombination lines of the Brackett, Pfund and Humphreys series. The observed line decrements in each spectral series are consistent with emission from ionized winds, as expected from these early-type stars. We compare the obser…
The strange mid-infrared spectrum of M 31: ISOCAM observations
Sauvage, M.; Pagani, L.; Lequeux, J. +3 more
We present observations of the mid-IR spectrum of 4 small regions of M 31. The spectrum of the central 3\arcmin is characterized by a strong, broad unidentified emission band (UIB) at 11.3 mu m while the other usual UIBs at 6.2, 7.7 and 8.6 mu m are absent or very faint. We present a map of this area in the 11.3 mu m band and compare it with optic…
Probing nuclear starburst activity in a sample of nearby spiral galaxies
Alloin, D.; Pastoriza, M. G.; Bonatto, C. +1 more
As part of a systematic study of the UV properties of galaxies in the IUE library, we present in this paper an analysis of nuclear stellar populations in spiral galaxies with radial velocity <= 5000 km/s. In this sample of 60 galaxies the IUE aperture probes a mean 1.0 kpc x 2.1 kpc area. Prior to any comparison of galaxy spectra in the range c…
The molecular cloud core M17-North: ISO spectroscopy and IR/mm continuum mapping
Henning, Th.; Lemke, D.; Launhardt, R. +2 more
We present the first complete infrared spectrum of a molecular cloud core covering the wavelength region from 2.4 up to 200mu m together with a map at 1.3mm wavelength and near-infrared (NIR) images. The core is located in the northern part of
X-ray spectroscopy of the active giant beta Ceti: the SAX LECS view
Peres, G.; Favata, F.; Sciortino, S. +1 more
We present an X-ray observation of the active giant beta Cet, performed with the Low Energy Concentrator Spectrometer (LECS) on-board the SAX satellite. The resulting X-ray spectrum is well fit by an optically-thin plasma model with two discrete temperatures, and the inferred coronal metallicity is compatible both with the abundances derived from …
A search for substellar companions around nine weak-lined T-Tauri stars with the Planetary Camera 2 of the Hubble Space Telescope
Torres, Guillermo; Latham, David W.; Sartoretti, Paola +1 more
To search for substellar companions, we have obtained I-band images of 9 weak-lined T-Tauri stars in the Taurus-Auriga star-forming region using the Planetary Camera 2 of the Hubble Space Telescope. Except for a stellar companion close to HBC 407, we found no companions within 8arcsec of any of our targets. We did find 23 faint objects outside a s…
Doppler imaging of stellar surface structure. VIII. The effectively single and rapidly-rotating G8-giant HD 51066 = CM Camelopardalis
Strassmeier, K. G.; Weber, M.; Washuettl, A. +2 more
We present first Doppler images of HD 51066 from observations in 1994, 1995, 1996 and 1997, and find evidence for a vanishing polar spot in accordance with the system's long-term brightness increase. Several small spots with Delta T~500 K appear also at low latitudes. Our cross-correlation maps indicate a latitude-dependent phase-shift pattern bet…
The PL relation of galactic carbon LPVs. The distance modulus to LMC
Bergeat, J.; Knapik, A.; Rutily, B.
We present a period-luminosity (PL) diagram of 115 galactic carbon-rich long period variables (LPVs) observed by the HIPPARCOS satellite, in the form of the (MK,log P) relation. Our plot is compared to the diagram of carbon variables observed in the Large Magellanic Cloud (LMC). Both diagrams are found very similar and three samples are…
ISOCAM images of the `elephant trunks' in M16
Blommaert, Joris A. D. L.; Altieri, Bruno; Pilbratt, Goeran L. +3 more
We have used ISOCAM to obtain images of the `elephant trunks' in the M16 `Eagle nebula' in the two broadband filters LW2 (5-8.5mu m) and LW3 (12-18mu m). These pillars are clearly seen in both our filters, their emission has a colour temperature in the range 250-320K. We have also detected bright extended emission in the LW3 filter, in an area out…
The mid infrared spectrum of the hyperluminous galaxies IRAS F15307+3252 and the Cloverleaf
Aussel, H.; Boulanger, F.; Gerin, M. +4 more
We report the detections of the hyperluminous galaxy IRAS F15307 +3252 at z = 0.93 and of the Cloverleaf quasar, H 1413+117 at z = 2.56, in the mid infrared using ISOCAM. The spectrum near 10 microns (observed wavelength) joins smoothly with the data taken from the ground or with the IRAS satellite. We have detected none of the infrared features a…