Monday 3 October 2022

Wednesday 7 September 2022

1D Solar Atmosphere Models in IDL: Standard Solar Model (from "The Sun", by Stix)

Stix, in his book ("The Sun: An Introduction", Springer, 2002) in Sect.2.4 introduces a standard solar model from the core to the surface defined as $\tau = 2/3$. His Table 2.4 (on p.56) lists the values of various quantities of this model versus the column mass or the height. Check the book for the details of the model. The table in ascii format is here: stix_tab.2.4.txt The columns are: $m/m_\odot$, $r/r_\odot$, $p \mathrm[Pa]$, $T \mathrm[K]$, $\rho \mathrm[kg/m^3]$, $L/L_\odot$, $X$, $\mu$, $\Gamma_1$.

Wednesday 13 July 2022

NGC 7319: GTC vs JWST

The first pictures from James Webb Space Telescope are simply mind blowing! Here is a comparison of NGC 7319 (from Stephan's quintet of galaxies) from Gran Telescopio Canarias (still the largest single aperture optical telescope) and from JWST. One should keep in mind that these are different instruments observing and different wavelengths. The alignment is also not perfect.