Page 84 - analysis-and-interpretation-of-astronomical-sp

Analysis and Interpretation of Astronomical Spectra 84

I

Synthetic
Solar Spectrum

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Of course, in practice, the temperature estimation of the investigated star is requested,
rather than the reproduction of an already known temperature of a synthetic profile. This
requests a radiometric correction of the obtained pseudo-continuum with a recorded stan-
dard star, according to sect. 8.11. Therefore, the accuracy of this measurement is also di-
rectly dependent on the quality of this relatively demanding correction procedure.

The following chart shows, in the context of the synthetic solar spectrum, the continua of
various effective temperatures according to Vspec Radiometry/Planck. In the range be-
tween 3,000 and 20,000 K, the increasingly closer following curves are displayed in 1,000
K steps. Above 20,000 K the intermediate spaces become so close, that here only the con-
tinua for 30,000 and 40,000 K are shown. It also shows that this estimation method is lim-
ited to the middle and late spectral types. In addition, with increasing temperature, the dif-
ferentiating influence of the spectral class to the radiometric correction is significantly de-
creasing (sect. 8.11).

I

7000 K Synthetic
Solar spectrum

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