Rapidly pulsating sdB stars search with GALEX J/ApJ/845/171 ivo://CDS.VizieR/J/ApJ/845/171 doi:10.26093/cds/vizier.18450171 CDS Boudreaux T.M. Barlow B.N. Fleming S.W. Soto A.V. Million C.,Reichart D.E. Haislip J.B. Linder T.R. Moore J.P. 2019-03-27T08:34:58Z 2018-05-22T09:21:00Z CDS support team CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France cds-question@unistra.fr subdwarf-stars ultraviolet-astronomy variable-stars NASA's Galaxy Evolution Explorer (GALEX) provided near- and far-UV observations for approximately 77% of the sky over a 10-year period; however, the data reduction pipeline initially only released single NUV and FUV images to the community. The recently released Python module gPhoton changes this, allowing calibrated time-series aperture photometry to be extracted easily from the raw GALEX data set. Here we use gPhoton to generate light curves for all hot subdwarf B (sdB) stars that were observed by GALEX, with the intention of identifying short-period, p-mode pulsations. We find that the spacecraft's short visit durations, uneven gaps between visits, and dither pattern make the detection of hot subdwarf pulsations difficult. Nonetheless, we detect UV variations in four previously known pulsating targets and report their UV pulsation amplitudes and frequencies. Additionally, we find that several other sdB targets not previously known to vary show promising signals in their periodograms. Using optical follow-up photometry with the Skynet Robotic Telescope Network, we confirm p-mode pulsations in one of these targets, LAMOST J082517.99+113106.3, and report it as the most recent addition to the sdBVr class of variable stars. 2017ApJ...845..171B https://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/845/171 Catalog Research IsServedBy TAP VizieR generic service IsServedBy Conesearch service related-to II/312 : GALEX-DR5 (GR5) sources from AIS and MIS (Bianchi+ 2011) II/294 : The SDSS Photometric Catalog, Release 7 (Adelman-McCarthy+, 2009) J/AJ/138/606 : Hot subdwarf stars in rejected PG catalog (Wade+, 2009) J/A+A/513/A6 : NOT survey of subdwarf B stars (Ostensen+, 2010) J/MNRAS/427/2180 : GALEX survey subdwarf atmospheric parameters (Nemeth+, 2012) J/ApJ/764/25 : FUSE spectra analysis of hot subdwarf stars (Jenkins, 2013) J/A+A/569/A15 : KIC 10553698A asteroseismology (Ostensen+, 2014) J/MNRAS/457/3396 : New hot subdwarf stars (Perez-Fernandez+, 2016) J/A+A/600/A50 : Catalog of hot subdwarf stars (Geier+, 2017) https://cds.unistra.fr/vizier-org/licences_vizier.html https://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/845/171 https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/845/171 http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/845/171 https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/845/171 https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/845/171 http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/845/171 GET text/xml+votable https://tapvizier.cds.unistra.fr/TAPVizieR/tap Cone search capability for table J/ApJ/845/171/sdb (List of the 1444 targets; table added by CDS) https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/845/171/sdb? https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/845/171/sdb? http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/845/171/sdb? 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45488 45513 45519 45556 45561 45666 45815 45816 46079 46174 46178 46181 46321 46399 46563 46574 46624 46844 46855 46859 46867 46878 46907 46916 46944 47006 47022 47076 47104 47105 47458 47687 47924 47935 48029 48128 48215 48274 48303 48385 48386 48387 48427 48444 48472 48501 48505 48621 48665 48769 48820 48889 48891 48894 48935 48953 48990 49007 49014 49017 49020 49077 49079 49085 49093 49102 49121 49122 49123 49129 49130 https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/845/171?format=ascii UV default J/ApJ/845/171/sdb List of the 1444 targets; table added by CDS SimbadName Simbad column added by the CDS meta.id char Name Target name (G1) meta.id;meta.main char primary recno Record number assigned by the VizieR team. Should Not be used for identification. meta.record int Kn Single GALEX visit for this known sdBVr target (table 2) meta.ref.url char Nv Number of visit for this star (table 1) meta.number int nullable Nkv Display data for this known pulsating sdBVr star (table 3) meta.ref.url int nullable G17 Display data from Geier+, 2017, J/A+A/600/A50 meta.ref.url char _RA Positions from Geier+ 2017, J/A+A/600/A50 (right ascension part) deg pos.eq.ra;meta.main _DE Positions from Geier+ 2017, J/A+A/600/A50 (declination part) deg pos.eq.dec;meta.main
J/ApJ/845/171/table1 Results from data analysis for 1444 stars recno Record number assigned by the VizieR team. Should Not be used for identification. meta.record int Name Target name (G1) meta.id;meta.main char Nv [1/119] Sequential visit number meta.record;phys.atmol.number int MJD Visit Start Time, JD-2400000.5 (G2) d time.epoch double Dur [723/1697] Visit duration s time.duration double <Noise> [-71300/1530690] Mean noise, parts per thousand (G3) instr.det.noise double Peak [5.4/3753.6] Max peak amplitude, parts per thousand (G3) src.var.amplitude float Freq [59/16667] Frequency of maximum peak (G3) uHz em.freq;src.var int Sigma [-9.2/594] Sigma metric stat.fit.param float
J/ApJ/845/171/table2 Single GALEX visit for the each of the 13 known sdBVr targets recno Record number assigned by the VizieR team. Should Not be used for identification. meta.record int Name Target name (G1) meta.id;meta.main char sdBVr [* ] *: sdBVr star identified in this study meta.code char MJD Visit Start Time, JD-2400000.5 (G2) d time.epoch double Dur [887/1694] Visit duration s time.duration double <Noise> [2.8/71.5] Mean noise, parts per thousand (G3) instr.det.noise float
J/ApJ/845/171/table3 Known pulsating sdBVr stars with GALEX-detected NUV variations recno Record number assigned by the VizieR team. Should Not be used for identification. meta.record int Name Target name (G1) meta.id;meta.main char Nv [1/2] Sequential visit number meta.record;phys.atmol.number int NUVamp [12/31] GALEX NUV amplitude, parts per thousand src.var.amplitude int e_NUVamp [2/4] Uncertainty in NUVamp, parts per thousand stat.error int Freq [2800/7880] Frequency of maximum peak (G3) uHz em.freq;src.var int e_Freq [32/121] Uncertainty in Freq uHz stat.error int Per [126/358] Period s time.period float