These are not the Stars You are Looking for: On the Detection of X-Ray Emission from HD 143352

Abstract

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\u2009keV energy band, with most counts detected in the 0.5–1.0\u2009keV band. The emission is consistent with a 106\u2009K plasma and L X\u2009∼\u20092\u2009×\u20091028\u2009erg\u2009s−1. This would be the second RV Tau star detected in X-ray emission. However, after estimating the temperature (T eff\u2009∼\u20096000 K) and bolometric luminosity (L bol\u2009∼\u20094L ⊙) 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\u2009∼\u200910−6.