2 Input spectra for synthetic photometry

A set of input spectra for the synthetic photometry to be carried out in this Paper II has been assembled. It includes normal and peculiar stars. Both sets can be downloaded from the ADPS web site, where further information on them is available.

Normal stars include synthetic spectra of $\iota$ Her (B3 IV), Vega (A0 V), Sun (G2 V), Arcturus (K2 III) and Betelgeuse (M2 Iab) as representative of the range of stars over the HR diagram. The spectrum of a carbon star characterized by  $T_{\rm eff}=3000$ K, $\lg g=0.0$, solar metallicity and ${\rm C/O}=1.1$ is added to the set of normal stars. Vega and the Sun are among the stellar sources more frequently used in literature in the computation of effective wavelengths. The spectrum of $\iota$ Her is taken from Castelli et al. (1997), the carbon star spectrum is from Ya. Pavlenko (private communication), and the others were downloaded from Kurucz's web site (http://kurucz.harvard.edu/), who computed them. Figure 1 presents the 3000 Å-6 $\mu$m portion of these spectra in a linear flux scale and logarithmic wavelength scale.

Peculiar stars include observed spectra of a sample of peculiar objects representative of those affected by emission lines. The spectra, absolutely fluxed, come from the spectral survey of Munari & Zwitter (2002) and cover the wavelength range 3200-9100 Å at a dispersion of $\sim$2.5 Å/pix. The spectra of the peculiar stars are used only with the optical photometric systems. For those bands which outer wings extended outside the 3200-9100 Å interval, the spectra of peculiar stars have been expanded by blackbody approximations of their continua to cover the whole profile band. Figure 2 displays the spectra in a logarithmic flux scale and linear wavelength scale, suitable to expand the dynamical range of the plot and to emphasize visibility of weak features. The peculiar objects are:

WN:

average spectrum of the two Wolf-Rayet stars of nitrogen type HD 50896 and HD 96548;

WC:   

average spectrum of the two Wolf-Rayet stars of carbon type HD 136488 and HD 165763;

PN_{$_{\rm Ne}$}:   

spectrum of the compact planetary nebula M1-13, that is given as representative of low electron density conditions (strong forbidden emission lines);

PN$^{\rm Ne}$:

spectrum of the compact planetary nebula M1-12, that is given as representative of high electron density conditions (hydrogen emission lines dominating);

Nova:

average spectrum of the three novae Nova Lup 1993, Nova Cir 1995 and Nova Cen 1995 during their nebular phases;

WDA:

average spectrum of the white dwarfs of type A (hydrogen dominated spectra) EG 274, LTT 7987 and LTT 4816.