HO Puppis: Not a Be Star, but a Newly Confirmed IW And-type Star

Abstract HO Puppis (HO Pup) was considered as a Be-star candidate based on its γ Cassiopeiae-type light curve, but lacked spectroscopic confirmation. Using distance measured from Gaia Data Release 2 and the spectral-energy-distribution fit broadband photometry, nature of Pup is ruled out. Furthermore, 28,700 photometric data points collected various time-domain surveys dedicated intensive-monitoring observations, curves closely resemble those IW And-type stars (as pointed out by Kimura et al.), exhibiting characteristics such quasi-standstill phase, brightening, dips. The curve displays variability timescales, including brightening cycles ranging 23 to 61 days, variations with periods between 3.9 days 50 minutes during semiregular ∼14 day period for dip events. We have also time-series spectra (with spectral resolutions), in which Balmer emission lines other expected an star were detected (even though some these be present Be stars). detect Bowen fluorescence near that can used discriminate stars. Finally, despite only observing four nights, polarization variation detected, indicating has significant intrinsic polarization.