2021RNAAS...5...52G

As part of a search for X-ray emission from RV Tau variable stars, we discovered a serendipitous X-ray detection of the closest RV Tau variable star, HD 143352. X-rays were detected in the 0.2-2.0 keV energy band, with most counts detected in the 0.5-1.0 keV band. The emission is consistent with a 10⁶ K plasma and L_X ∼ 2 × 10²⁸ erg s^–1. This would be the second RV Tau star detected in X-ray emission. However, after estimating the temperature (T_eff ∼ 6000 K) and bolometric luminosity (L_bol ∼ 4L_⊙) from the spectral energy distribution, we place HD 143352 on the main sequence. These stellar parameters suggest HD 143352 is neither an RV Tau variable nor a post-asymptotic giant branch star nor a super giant, but rather an early F-type main sequence star. The X-ray emission detected from HD 143352 is consistent with coronal-like emission with L_X/L_bol ∼ 10^–6.