J/ApJ/911/51 1894-2020 opt-to-NIR photometry of HO Puppis (Lee+, 2021)
HO Puppis: not a Be star, but a newly confirmed IW And-type star.
Lee 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.
<Astrophys. J., 911, 51 (2021)>
=2021ApJ...911...51L 2021ApJ...911...51L
ADC_Keywords: Stars, variable; Photometry, infrared; Optical; Surveys
Keywords: Dwarf novae ; Be stars ; Sky surveys ; Time series analysis
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 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 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.
Description:
Time-series photometric data ranging from optical to infrared for
HO Pup were collected from various survey catalogs, including the ZTF,
the ASAS-SN, the Digital Access to a Sky Century @ Harvard (DASCH,
Grindlay+ 2012IAUS..285...29G 2012IAUS..285...29G), the third phase of the All Sky
Automated Survey (ASAS-3, Pojmanski+ 2002, II/264), the Panoramic
Survey Telescope and Rapid Response System 3π survey (Pan-STARRS,
Chambers+ 2016, II/349), the Wide-field Infrared Survey Explorer
(WISE, Cutri+ 2012, II/311), and observations available via the
American Association of Variable Star Observers (AAVSO).
These light-curve data were supplemented with dedicated observations
taken at the Lulin Observatory with the 0.4m SLT telescope in Taiwan.
These light curves are listed in Table 1 and cover years from 1894 to
2020. See Section 2.1.
Spectroscopic observations with low and high spectral resolutions were
conducted by P60/SEDM, the 1.8m Optical Telescope at the Bohyunsan
Optical Astronomy Observatory (BOAO)/Bohyunsan Optical Echelle
Spectrograph (BOES), CFHT/ESPaDOnS, and P200/DBSP. Additionally,
polarization was measured on four different nights in late October
2018 using the TRIPOL2 instrument installed at the Lulin Observatory.
See Section 2.2.
Objects:
----------------------------------------------------------
RA (ICRS) DE Designation(s)
----------------------------------------------------------
07 33 54.18 -15 45 38.3 HO Pup = V* HO Pup
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File Summary:
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FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table1.dat 37 28700 Collected light curves with 28700 data points
for HO Pup
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See also:
B/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)
Byte-by-byte Description of file: table1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 10 F10.4 d MJD [13146.3/58938.6] Modified Julian Date,
(JD-2400000.5)
12- 17 F6.3 mag omag [12.4/16.05] Observed magnitude in Filt
19- 23 F5.3 mag e_omag [0.001/0.42] Magnitude error
25- 26 A2 --- Filt Filter (BV, grizy, W1, W2)
28- 37 A10 --- r_omag Source of photometry (1)
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Note (1): Source(s) of observed magnitudes as follows:
AAVSO = observations available via the American Association
of Variable Star Observers;
ASAS-3 = All Sky Automated Survey, 3rd phase;
ASAS-SN = All-Sky Automated Survey for Supernovae;
DASCH = Digital Access to a Sky Century at Harvard;
Lulin = Dedicated observations, Lulin Observatory, Taiwan
(see the Description section);
Pan-STARRS = Panoramic Survey Telescope and Rapid Response
System 3π survey;
WISE = Wide-field Infrared Survey Explorer;
ZTF = Zwicky Transient Facility.
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 11-Oct-2022