CAOSP abstracts, Volume: 32, No.: 2, year: 2002
- Author(s): Koza, J.; Kučera, A.
- Journal: Contributions of the Astronomical Observatory Skalnaté Pleso, vol. 32, no. 2, p. 190-204.
- Date: 10/2002
- Title: Spectral line response to temperature perturbation in solar and stellar photospheric models. I. Neutral Fe I line 522.5nm case
- Keyword(s): solar photosphere, line formation, line profiles, perturbations
- Pages: 190 -- 204
The sensitivity of the line profile of the neutral Fe I 522.5nm line to Gaussian
perturbations of temperature distribution in the photospheric models is examined.
Stokes I response functions to temperature of the Fe I 522.5nm line have been
calculated using different classes of the solar
In the LTE approximation three one-component models HOLMU, HSRA, VAL3C and a new
two-component photospheric model are tested.
In the (log τ_5, λ) plane the response functions have been calculated for
all four models.
It is shown that in the case of one-component models, the temperature
perturbation in the upper photospheric layers only affects the core of the
line profile and in contrast, the temperature perturbation of the deep photosphere
affects only the line-wings.
This is not the case in the two-component model, where the heating or cooling of the
upper photosphere significantly modifies not only the line-core but also the wings.
A detailed examination of this effect is presented and discussed to point out the
incompatibility of simplified one-component models with the real physical conditions
of the stellar photosphere.
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