J/ApJ/911/51ivo://CDS.VizieR/J/ApJ/911/51doi:10.26093/cds/vizier.19110051CDSLee C.-D.Ou J.-Y.Yu P.-C.Ngeow C.-C.Huang P.-C.Ip W.-H.,Hambsch F.-J.Sung H.-I.van Roestel J.Dekany R.Drake A.J.,Graham M.J.Duev D.A.Kaye S.Kupfer T.Laher R.R.Masci F.J.,Mroz P.Neill J.D.Riddle R.Rusholme B.Walters R.2022-11-16T06:00:08Z2022-11-09T10:25:13ZCDS support team

CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France

cds-question@unistra.frvariable-starsinfrared-photometryvisible-astronomysurveysHO Puppis (HO Pup) was considered as a Be-star candidate based on its {gamma} Cassiopeiae-type light curve, but lacked spectroscopic confirmation. Using distance measured from Gaia Data Release 2 and the spectral-energy-distribution fit on broadband photometry, the Be-star nature of HO Pup is ruled out. Furthermore, based on the 28700 photometric data points collected from various time-domain surveys and dedicated intensive-monitoring observations, the light curves of HO Pup closely resemble those of IW And-type stars (as pointed out by Kimura+ 2020PASJ...72...22K), exhibiting characteristics such as a quasi-standstill phase, brightening, and dips. The light curve of HO Pup displays various variability timescales, including brightening cycles ranging from 23 to 61days, variations with periods between 3.9d and 50min during the quasi-standstill phase, and a semiregular ~14d period for the dip events. We have also collected time-series spectra (with various spectral resolutions), in which Balmer emission lines and other spectral lines expected for an IW And-type star were detected (even though some of these lines were also expected to be present for Be stars). We detect Bowen fluorescence near the brightening phase, and that can be used to discriminate between IW And-type stars and Be stars. Finally, despite only observing for four nights, the polarization variation was detected, indicating that HO Pup has significant intrinsic polarization.2021ApJ...911...51Lhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/911/51CatalogResearchIsServedByTAP VizieR generic servicerelated-toB/gcvs : General Catalogue of Variable Stars (Samus+, 2007-2017)II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)II/264 : ASAS Variable Stars in Southern hemisphere (Pojmanski+, 2002-2005)I/305 : The Guide Star Catalog, Version 2.3.2 (GSC2.3) (STScI, 2006)II/311 : WISE All-Sky Data Release (Cutri+ 2012)I/322 : UCAC4 Catalogue (Zacharias+, 2012)II/349 : The Pan-STARRS release 1 (PS1) Survey - DR1 (Chambers+, 2016)I/345 : Gaia DR2 (Gaia Collaboration, 2018)II/358 : SkyMapper Southern Sky Survey. DR1.1 (Wolf+, 2018)II/366 : ASAS-SN catalog of variable stars (Jayasinghe+, 2018-2020)I/353 : The Guide Star Catalog, Version 2.4.2 (GSC2.4.2) (STScI, 2020)J/A+A/548/A79 : INTEGRAL-OMC optically variable sources (Alfonso-Garzon+, 2012)J/ApJ/788/48 : X-ray through NIR photometry of NGC 2617 (Shappee+, 2014)J/AJ/153/252 : Phot. variability of BeSS-KELT stars (Labadie-Bartz+, 2017)J/AJ/156/241 : First cat. of variable stars measured by ATLAS (Heinze+, 2018)J/AJ/155/91 : Be stars in open clusters with PTF/iPTF. I. (Yu+, 2018)J/A+A/621/A38 : Gaia catalogue of hot subluminous stars (Geier+, 2019)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/911/51https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/911/51http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/911/51https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/911/51https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/911/51http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/911/51GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticalInfrareddefaultJ/ApJ/911/51/table1Collected light curves with 28700 data points for HO Pupr_omagSource of photometry (1)meta.refcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintMJD[13146.3/58938.6] Modified Julian Date, (JD-2400000.5)dtime.epochdoubleindexedomag[12.4/16.05] Observed magnitude in Filtmagphot.magfloate_omag[0.001/0.42] Magnitude errormagstat.error;phot.magfloatFiltFilter (BV, grizy, W1, W2)meta.id;instr.filterchar