  SiH has long been observed in the spectrum of our Sun and other cool stars.
Computed line lists for the main isotopologues of silicon monohydride,
$^{28}$SiH, $^{29}$SiH, $^{30}$SiH and $^{28}$SiD are presented. These line
lists consider rotation-vibration transitions within the ground $X$ $^{2}\Pi$
electronic state as well as transitions to the low-lying $A$ $^{2}\Delta$ and
$a$ $^{4}\Sigma^-$ states. Ab initio potential energy (PECs) and dipole moment
curves (DMCs) along with spin-orbit and electronic-angular-momentum couplings
between them are calculated using the MRCI level of theory with the MOLPRO
package. The PEC for the ground X $^2\Pi$ state is refined to available
experimental data with a typical accuracy of around 0.01 cm$^{-1}$ or better.
The $^{28}$SiH line list includes 11,785 rovibronic states and 1,724,841
transitions with associated Einstein-A coefficients for angular momentum $J$ up
to $82.5$ and covering wavenumbers up to 31340 cm$^{-1}$ ($\lambda$ $<$ 0.319
$\mu$m). Spectra are simulated using the new line list and comparisons made
with various experimental spectra. These line lists are applicable up to
temperatures of ~5000 K, making them relevant to astrophysical objects such as
exoplanetary atmospheres and cool stars and opening up the possibility of
detection in the interstellar medium. These line lists are available at the
ExoMol www.exomol.com and CDS database websites.
