View here: Details for AAVSO photometry and spectroscopy request for RW Cep and Rho Cas
Abstract: We have scheduled CHARA Array observations on 19 October and 20 November to image RW Cep and Rho Cas as part of a long-term monitoring program of stellar surface structure and the circumstellar envelope in these two peculiar hypergiant stars since 2023. Our goals are to track pulsation and convection-cell activity over time and to relate these phenomena to mass-loss behavior.
Justification: Coordinated photometry and spectroscopy are essential to interpret the interferometric data. The CHARA Array will carry out interferometry imaging in H band (1.50–1.75 µm) and K band (2.00–2.40 µm), and in the mode for imaging and visibility measurements for surface features and envelope structure. AAVSO coverage is requested for at least October 16-23 and November 17-23; cadence is given below. Nightly observations made between the CHARA windows would also be welcome.