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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 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…

Estimating stellar parameters from spectra using a hierarchical Bayesian approach

Aerts, C.; Decin, L.; Molenberghs, G. +1 more

A method is developed for fitting theoretically predicted astronomical spectra to an observed spectrum. Using a hierarchical Bayesian principle, the method takes both systematic and statistical measurement errors into account, which has not been done before in the astronomical literature. The goal is to estimate fundamental stellar parameters and …