All Tables

Table 1: Basic parameters of the sample stars. In Cols. 1 and 2 we give the index number by which a star can be identified in tables and figures throughout this work, and the name of the star, respectively. The classification of the sources according to ME01 is listed in the third column. In Col. 5 the distances, derived from direct (Hipparcos) parallax measurements or by association to a star forming region (SFR, Col. 4), are given. For the stars where the distance is determined by association with a SFR we assume an error of 30% in the distance. The spectral type according to the MK classification, the effective temperature and the stellar luminosity are given in Cols. 6-8, respectively. Mass and age estimates for most stars, as derived by comparing their positions in the HR diagram to theoretical pre-main-sequence tracks, are given in Cols. 9 and 10. For HD 101412 we have no reliable distance estimate, and can therefore not determine its luminosity, mass and age.
Table 2: Literature infrared photometry used in this work. Columns 3-7 list the magnitudes in the J (1.25 $\mu$ m), H (1.65 $\mu$ m), K (2.2 $\mu$ m), L (3.6 $\mu$ m), and M (4.8 $\mu$ m) photometric bands, with references in Col. 8. The listed reference codes are: BO: Bouchet et al. (1991); CA: Carter (1990); CO: Cohen (1973); CU: Cutri et al. (2003); DW: de Winter et al. (2001); DW2: de Winter et al. (1996); EI: Eiroa et al. (2001); FO: Fouque et al. (1992); GL: Glass & Penston (1974); HI: Hillenbrand et al. (1992); LA: Lawrence et al. (1990); MA: Malfait et al. (1998a); ME: Mendoza (1967); ST: Strom et al. (1990); SY: Sylvester et al. (1996); VR: Vrba et al. (1976); WA: Waters et al. (1988). Columns 9-12 contain the infrared fluxes in Jy from the IRAS Point Source Catalogue (Joint IRAS Science Working Group 1988).
Table 3: Log of the TIMMI 2 observations. We list the observing date (defined as the day on which each observing night began), time (UT), airmass of the observation, and integration time in seconds (Cols. 3-6). The calibrators used for the atmospheric correction are also given, with the time and airmass of the measurements (Cols. 7-12).
Table 4: Spectral templates used for the calibrators (see Sect. 3.1).
Table 5: Characteristics of the various dust components used in the fitting procedure (see Sect. 5.1). The chemical formulae and assumed grain shapes have been indicated in the second and third column. In the fourth column, we give references for the refractive index data used.
Table 6: The best fit values of the parameters in our compositional fits. The abundances of small (0.1 $\mu$ m) and large (1.5 $\mu$ m) grains of the various dust species are given as fractions of the total dust mass, excluding the dust responsible for the continuum emission. If a species was not found, or unconstrained by the spectra, this is indicated by a - symbol. The PAH and continuum flux contributions (the last two columns) are listed as percentages of the total integrated flux over the 10 $\mu$ m region, contained in these components. These are measures for the relative flux contributions, but cannot be interpreted as relative dust masses.