Search Publications
Comparison of the composition of the Tempel 1 ejecta to the dust in Comet C/Hale Bopp 1995 O1 and YSO HD 100546
Li, A.; Kraemer, K. E.; Lisse, C. M. +2 more
Spitzer Infrared Spectrograph observations of the Deep Impact experiment in July 2005 have created a new paradigm for understanding the infrared spectroscopy of primitive solar nebular (PSN) material—the ejecta spectrum is the most detailed ever observed in cometary material. Here we take the composition model for the material excavated from Comet…
Evolution of Dust and Ice Features around FU Orionis Objects
Quanz, S. P.; Henning, Th.; van Boekel, R. +5 more
We present spectra for a sample of 14 FUors and two T Tauri stars observed with Spitzer or ISO. Based on the appearance of the 10 µm silicate feature, we define two categories of FUors. Objects showing the silicate feature in absorption (Category 1) are still embedded in a circumstellar envelope. The shape of the silicate bands is in good ag…
The outburst of the eruptive young star OO Serpentis between 1995 and 2006
Prusti, T.; Siebenmorgen, R.; Hony, S. +4 more
Aims:OO Serpentis is a deeply embedded pre-main sequence star in the Serpens NW star-forming region. The star went into outburst in 1995 and gradually faded afterwards. In many respects its eruption resembled the well-known FU Orionis-type (FUor) or EX Lupi-type (EXor) outbursts. Since very few such events have ever been documented at infrared wav…
The molecular and dusty composition of Betelgeuse's inner circumstellar environment
Nguyen, Q. N.; Lopez, B.; Leinert, Ch. +6 more
Context: The study of the atmosphere of red supergiant stars in general and of
Aims: A molecular shell, the MOLsphere (Tsuji 2000a, ApJ, 538, 80…
The initial conditions of isolated star formation - VII. Spitzer mapping of pre-stellar cores
Ward-Thompson, D.; André, P.; Kirk, J. M.
We have retrieved Spitzer archive data of pre-stellar cores taken with the Multiband Imaging Photometer for Spitzer (MIPS) at a wavelength of 160 µm. Seventeen images, containing 18 cores, were constructed. Flux densities were measured for each core, and background estimates were made. Mean off-source backgrounds were found to be 48 +/- 10 M…
The infrared compactness-temperature relation for quiescent and starburst galaxies
Elbaz, D.; Chanial, P.; Vigroux, L. +3 more
Context: IRAS observations show the existence of a correlation between the infrared luminosity L_IR and dust temperature Td in star-forming galaxies, in which larger L_IR leads to higher dust temperature. The L_IR -Td relation is commonly seen as reflecting the increase in dust temperature in galaxies with higher star formati…
The cooling of atomic and molecular gas in DR21
Schneider, N.; Ossenkopf, V.; Bontemps, S. +5 more
Aims: We present an overview of a high-mass star formation region through the major (sub-)mm, and far-infrared cooling lines to gain insight into the physical conditions and the energy budget of the molecular cloud.
Methods: We used the KOSMA 3 m telescope to map the core (10'× 14') of the Galactic star-forming region DR21/DR21 (OH) in the Cyg…
The Mid-Infrared Emission of Seyfert Galaxies: A New Analysis of ISOCAM Data
Pérez García, A. M.; Acosta-Pulido, J. A.; Ramos Almeida, C. +1 more
We present mid-infrared data of a sample of 57 AGNs obtained with the instrument ISOCAM on board the Infrared Space Observatory (ISO) satellite. The images were obtained through the LW2 (6.75 µm) and LW7 (9.62 µm) filters. This is a new analysis of the Clavel et al. galaxy sample, which is divided into 26 type 1 (<=1.5) and 28 type …
The ISO LWS high-resolution spectral survey towards Sagittarius B2
Cernicharo, José; Polehampton, Edward T.; Swinyard, Bruce M. +5 more
A full spectral survey was carried out towards the giant molecular cloud complex, Sagittarius B2 (SgrB2), using the Infrared Space Observatory (ISO) Long Wavelength Spectrometer (LWS) Fabry-Pérot mode. This provided complete wavelength coverage in the range 47-196µm (6.38-1.53THz) with a spectral resolution of 30-40kms-1. This is …
Long-term infrared variability of the UX Ori-type star SV Cep
Prusti, T.; Ábrahám, P.; Dullemond, C. P. +1 more
We investigate the long-term optical-infrared variability of SVCep and explain it in the context of an existing UX Ori (UXOR) model. A 25-month monitoring programme was completed with the Infrared Space Observatory in the 3.3-100 µm wavelength range. Following a careful data reduction, the infrared light curves were correlated with the varia…