J/A+A/576/A44ivo://CDS.VizieR/J/A+A/576/A44doi:10.26093/cds/vizier.35760044CDSKupfer T.Geier S.Heber U.Ostensen R.H.Barlow B.N.Maxted P.F.L.,Heuser C.Schaffenroth V.Gaensicke B.T.2018-05-30T05:07:52Z2015-06-26T12:11:45ZCDS support team

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

cds-question@unistra.frsubdwarf-starsmultiple-starsphotometryradial-velocityeffective-temperatureThe project Massive Unseen Companions to Hot Faint Underluminous Stars from SDSS (MUCHFUSS) aims at finding hot subdwarf stars with massive compact companions like massive white dwarfs (M>1.0M_{sun}_), neutron stars, or stellar-mass black holes. The existence of such systems is predicted by binary evolution theory, and recent discoveries indicate that they exist in our Galaxy. We present orbital and atmospheric parameters and put constraints on the nature of the companions of 12 close hot subdwarf B star (sdB) binaries found in the course of the MUCHFUSS project. The systems show periods between 0.14 and 7.4days. In nine cases the nature of the companions cannot be constrained unambiguously whereas three systems most likely have white dwarf companions. We find that the companion to SDSSJ083006.17+475150.3 is likely to be a rare example of a low-mass helium-core white dwarf. SDSSJ095101.28+034757.0 shows an excess in the infrared that probably originates from a third companion in a wide orbit, which makes this system the second candidate hierarchical triple system containing an sdB star. SDSSJ113241.58-063652.8 is the first helium deficient sdO star with a confirmed close companion. This study brings to 142 the number of sdB binaries with orbital periods of less than 30 days and with measured mass functions. We present an analysis of the minimum companion mass distribution and show that it is bimodal. One peak around 0.1M_{sun}_ corresponds to the low-mass main sequence (dM) and substellar companions. The other peak around 0.4M_{sun}_ corresponds to the white dwarf companions. The derived masses for the white dwarf companions are significantly lower than the average mass for single carbon-oxygen white dwarfs. In a T_eff_-logg diagram of sdB+dM companions, we find signs that the sdB components are more massive than the rest of the sample. The full sample was compared to the known population of extremely low-mass white dwarf binaries as well as short-period white dwarfs with main sequence companions. Both samples show a significantly different companion mass distribution indicating either different selection effects or different evolutionary paths. We identified 16 systems where the dM companion will fill its Roche Lobe within a Hubble time and will evolve into a cataclysmic variable; two of them will have a brown dwarf as donor star. Twelve systems with confirmed white dwarf companions will merge within a Hubble time, two of them having a mass ratio to evolve into a stable AMCVn-type binary and another two which are potential supernova Ia progenitor systems. The remaining eight systems will most likely merge and form RCrB stars or massive C/O white dwarfs depending on the structure of the white dwarf companion.2015A&A...576A..44Khttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/576/A44CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+A/530/A28 : Priority targets for the MUCHFUSS project (Geier+, 2011)J/A+A/559/A35 : FBS 0117+396 pulsating sdB star photometry (Ostensen+, 2013)J/A+A/577/A26 : MUCHFUSS RV variable hot subluminous stars (Geier+, 2015)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/576/A44https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/576/A44http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/576/A44https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/576/A44https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/576/A44http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/576/A44GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/576/A44/sample (Orbital parameters (table A2) and photometry, spectroscopic distances and companion types (table A3) of all published He-burning hot subdwarf binaries)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/576/A44/sample?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/576/A44/sample?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/576/A44/sample?GETtext/xml+votable180.050000true133.34862516.82647220.0055555555555555566/64 1957 2641 2981 3092 3139 4078 4293 4346 4497 4604 4610 4613 4931 5021 5270 5544 5710 6108 6471 6613 7557 7830 8016 8284 8388 8696 8770 8791 8982 9328 9470 9664 9683 9775 10024 10123 10132 10315 10333 10379 10400 11159 11294 11680 12334 13339 13646 14217 14396 14573 14578 14669 14770 14779 14825 14961 15132 15348 16625 16744 17323 18003 18063 18132 18372 18550 18748 18900 18906 18997 19270 20224 20279 20383 20474 20904 21867 23510 25061 25068 25531 25624 25845 25905 25921 25927 26112 26348 26609 26780 26808 26837 26886 26959 27177 27324 27352 27379 27905 27956 28390 28415 28586 28880 28973 30168 31332 31372 31491 32372 32380 32476 32672 33097 33795 34101 35150 35383 35713 35720 35798 36307 36382 38667 38751 38857 41656 43860 44026 44789 44969 45027 45270 45566 45681 46295 46795 47381 48477 48753 491291.143914381504295e-19 3.852589004194616e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/576/A44?format=asciidefaultJ/A+A/576/A44/sampleOrbital parameters (table A2) and photometry, spectroscopic distances and companion types (table A3) of all published He-burning hot subdwarf binariesSimbadNameSimbad column added by the CDSmeta.idcharn_Type[lc ] lc: type identified photometricallymeta.notecharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintn_Object[*] * for SDSS troncated namesmeta.notecharObjectObject namemeta.id;meta.maincharTeff[20300/46400]? Effective temperatureKphys.temperature.effectiveintnullablee_Teff[0/1800]? rms uncertainty on TeffKstat.error;phys.temperature.effectiveintnullablelogg[4.9/6.1]? Surface gravitylog(cm.s**-2)phys.gravityfloatnullablee_logg[0.02/0.2]? rms uncertainty on logglog(cm.s**-2)stat.errorfloatnullablePer[0.04/28] Orbital Perioddtime.perioddoublee_Per[0/0.2]? rms uncertainty on Perdstat.errordoublenullablegamma[-113/136]? System velocity {gamma}km/sphys.velocfloatnullablee_gamma[0.08/20]? rms uncertainty on gammakm/sstat.errorfloatnullableK[12/377]Semi-amplitude radial velocity Kkm/sspect.dopplerVeloc;em.IR.Kfloate_K[0.04/8.6]? rms uncertainty on Kkm/sstat.errorfloatnullableRef1References, in refs.dat filemeta.ref;pos.framecharVmag[9.8/18.3]? V magnitudemagphot.mag;em.opt.Vfloatnullablee_Vmag? rms uncertainty on Vmagmagstat.error;phot.mag;em.opt.VfloatnullableJmag[10.3/18.5]? J magnitudemagphot.mag;em.IR.Jfloatnullablee_Jmag[0/0.15]? rms uncertainty on Jmagmagstat.error;phot.mag;em.IR.Jfloatnullableq_Jmag[BCD] 2MASS colours of quality B, C or D which were excluded from the analysismeta.code.qualcharHmag[10.4/18.3]? H magnitudemagphot.mag;em.IR.Hfloatnullablee_Hmag[0/0.23]? rms uncertainty on Hmagmagstat.error;phot.mag;em.IR.Hfloatnullableq_Hmag[BCD] 2MASS colours of quality B, C or D which were excluded from the analysismeta.code.qualcharDist[0.1/5.8]? Distancekpcpos.distance;pos.heliocentricfloatnullableE_Dist[0/0.74]? Error on Dist (upper value)kpcstat.error;stat.maxfloatnullablee_Dist[0/0.51]? Error on Dist (lower value)kpcstat.errorfloatnullableTypeCompanion type: MS=MainSequence, WD=WhiteDwarf, BD=BrownDwarfsrc.classcharRef2References, in refs.dat filemeta.ref;pos.framechar_RARight Ascension (J2000) from SIMBAD (not part of the original data)degpos.eq.ra;meta.main_DEDeclination (J2000) from SIMBAD (not part of the original data)degpos.eq.dec;meta.mainJ/A+A/576/A44/refsReferencesBibCodeBibcodemeta.bib.bibcodecharAutAuthor's namemeta.bib.authorcharComCommentsmeta.notecharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRefReference numbermeta.id;meta.mainchar