RVA FW Boo phase plot looks suspiciously like EB, but period… and amplitude…
Sometimes the variability types actually fit the star! Looks like the prototypical RVa with alternating minima. I had a look at the GAIA3 and LAMOST4 spectra for the star. The GAIA one is a mess since it is just the average of all the scans, so the different brightness levels are not taken into account. The two LAMOST4 spectra are interesting. At the blue end, 3700A - 5000A, where one does the ‘classical’ MK spectral classification, it looks like about G0, consistent with with the VSX type of F9. The blue portion of the spectrum is fairly noisy, so that’s about as detailed as I’d make it. In the far-red, longward of 6000A, I classify it as M0/1IIIe, with strong H-alpha emission and significant TiO absorption bands with strengths close to M0 and M1 templates I have. I think this is known phenomenon. It suggests getting photometry at (say) B, V, and I (or even Sloan z) would show the pattern of temperature changes in the star.
\Brian
Thank you Brian! Indeed color indexes should change during pulsations. I even thought to propose AAVSOnet BVRI observations on pair of FW Boo periods, but field is poor.