J/AJ/144/93ivo://CDS.VizieR/J/AJ/144/93doi:10.26093/cds/vizier.51440093CDSMorgan D.P.West A.A.Garces A.Catalan S.Dhital S.Fuchs M.,Silvestri N.M.2019-08-06T11:58:47Z2015-05-21T12:40:58ZCDS support team

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

cds-question@unistra.frspectroscopic-binary-starsdwarf-starswhite-dwarf-starsWe present a study of close white dwarf and M dwarf (WD+dM) binary systems and examine the effect that a close companion has on the magnetic field generation in M dwarfs. We use a base sample of 1602 white dwarf main-sequence binaries from Rebassa-Mansergas et al. to develop a set of color cuts in GALEX, SDSS, UKIDSS, and 2MASS color space. Then using the SDSS Data Release 8 spectroscopic database, we construct a sample of 1756 WD+dM high-quality pairs from our color cuts and previous catalogs. We separate the individual WD and dM from each spectrum using an iterative technique that compares the WD and dM components to best-fit templates. Using the absolute height above the Galactic plane as a proxy for age, and the H{alpha} emission line as an indicator for magnetic activity, we investigate the age-activity relation for our sample for spectral types <=M7. Our results show that early-type M dwarfs (<=M4) in close binary systems are more likely to be active and have longer activity lifetimes compared to their field counterparts. However, at a spectral type of M5 (just past the onset of full convection in M dwarfs), the activity fraction and lifetimes of WD+dM binary systems become more comparable to that of the field M dwarfs. One of the implications of having a close binary companion is presumed to be increased stellar rotation through disk disruption, tidal effects, or angular momentum exchange. Thus, we interpret the similarity in activity behavior between late-type dMs in WD+dM pairs and late-type field dMs to be due to a decrease in sensitivity in close binary companions (or stellar rotation), which has implications for the nature of magnetic activity in fully convective stars. Using the WD components of the pairs, we find WD cooling ages to use as an additional constraint on the age-activity relation for our sample. We find that, on average, active early-type dMs tend to be younger and that active late-type dMs span a much broader age regime making them indistinguishable from the inactive late-type population. We also show that magnetic strength, as measured by H{alpha}, is comparable between paired and field M dwarfs until a spectral type of M6/M7 where M dwarf activity for stars with close companions becomes much stronger. In addition, we present 37 very close candidate pairs with fast-moving orbits that display radial velocity changes over hour timescales.2012AJ....144...93Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/144/93CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toII/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)II/294 : SDSS Photometric Catalog, Release 7 (Adelman-McCarthy, 2009)II/312 : GALEX-DR5 (GR5) sources from AIS and MIS (Bianchi+ 2011)II/319 : UKIDSS-DR9 LAS, GCS and DXS Surveys (Lawrence+ 2012)J/AJ/129/2428 : M dwarf-white dwarf binary systems (Silvestri+, 2005)J/AJ/134/26 : Binaries with white dwarf in 2MASS (Hoard+, 2007)J/MNRAS/382/1377 : SDSS WD main-sequence binaries (Rebassa-Mansergas+, 2007)J/A+A/496/191 : Spectral analysis of 636 SDSS WD-M binaries (Heller+, 2009)J/MNRAS/402/620 : SDSS WD main-sequence binaries (Rebassa-Mansergas+, 2010)J/MNRAS/424/1841 : SDSS-UKIDSS white dwarf-main sequence binaries (Liu+, 2012)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/144/93https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/144/93http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/144/93https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/144/93https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/144/93http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/144/93GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/144/93/table (Parameters for 1756 close WD+dM pairs)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/144/93/table?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/144/93/table?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/144/93/table?GETtext/xml+votable180.050000true0.2892680625.916536110.0055555555555555565/1026 1187 1249 1312 2640 4521 4709 4851 6/0 1 2 21 26 51 65 527 545 714 715 722 725 902 904 908 910 971 992 997 1009 1011 1013 1015 1699 1701 1703 2033 2034 2066 2091 2094 2298 2300 2629 2644 3965 4053 4111 4117 4119 4123 4126 4129 4133 4134 4135 4139 4140 4142 4143 4152 4153 4154 4159 4166 4174 4179 4185 4199 4202 4210 4220 4233 4240 4249 4255 4261 4268 4272 4274 4279 4283 4287 4293 4296 4298 4300 4304 4310 4324 4325 4326 4330 4338 4339 4347 4358 4382 4386 4391 4396 4406 4407 4411 4412 4413 4414 4419 4422 4428 4432 4433 4440 4444 4450 4464 4466 4474 4483 4491 4494 4508 4509 4515 4520 4529 4531 4536 4545 4554 4557 4563 4565 4578 4582 4589 4608 4613 4616 4619 4625 4626 4628 4629 4630 4639 4640 4653 4663 4666 4673 4679 4683 4685 4689 4691 4692 4698 4704 4707 4708 4716 4717 4730 4731 4734 4739 4743 4746 4756 4769 4770 4771 4772 4774 4789 4794 4795 4796 4797 4799 4801 4803 4809 4810 4814 4817 4822 4827 4833 4845 4851 4853 4854 4864 4871 4879 4880 4881 4883 4890 4898 4911 4913 4919 4922 4924 4925 4929 4941 4943 4946 4956 4965 4972 4973 4976 4978 4983 4995 5002 5005 5010 5028 5029 5035 5048 5059 5065 5086 5102 5105 5106 5112 5120 5121 5131 5148 5164 5177 5178 5179 5187 5197 5199 5201 5204 5207 5212 5213 5218 5219 5228 5238 5240 5253 5265 5267 5269 5270 5274 5286 5287 5296 5301 5304 5309 5310 5326 5334 5344 5350 5357 5360 5361 5367 5372 5384 5387 5388 5417 5419 5424 5428 5432 5433 5434 5445 5452 5474 5475 5484 5492 5499 5510 5511 5518 5536 5537 5541 5570 5600 5616 5619 5624 5637 5643 5653 5660 5665 5667 5678 5681 5688 5695 5696 5703 5711 5713 5727 5741 5756 5757 5764 5772 5778 5782 5791 5796 5798 5803 5807 5808 5816 5818 5843 5850 5871 5875 5879 5891 5892 5896 5907 5908 5910 5913 5914 5921 5940 5942 5946 5975 5990 5992 6011 6018 6025 6032 6042 6052 6057 6079 6082 6093 6094 6096 6102 6105 6117 6124 6128 6162 6163 6165 6197 6210 6211 6214 6217 6219 6234 6241 6257 6260 6266 6312 6340 6343 6344 6345 6353 6358 6367 6381 6387 6389 6390 6393 6394 6397 6399 6409 6416 6426 6433 6440 6444 6450 6463 6490 6495 6510 6514 6515 6519 6526 6531 6536 6537 6540 6541 6545 6547 6555 6560 6563 6568 6569 6577 6578 6593 6598 6601 6607 6608 6612 6630 6631 6632 6648 6655 6710 6712 6713 6726 6727 6729 6732 6741 6913 7178 7248 7250 7257 7270 7272 7286 7309 7311 7314 7315 7320 7321 7323 7330 7331 7334 7339 7358 7361 7372 7378 7387 7388 7396 7403 7417 7427 7429 7440 7444 7445 7456 7463 7468 7495 7496 7503 7507 7513 7515 7516 7528 7529 7536 7538 7553 7555 7558 7602 7743 7779 7836 8126 8142 8143 8164 8169 8170 8193 8197 8207 8242 8259 8264 8265 8267 8268 8270 8275 8276 8283 8287 8315 8328 8331 8336 8345 8352 8355 8367 8376 8384 8414 8418 8426 8432 8434 8438 8441 8445 8458 8459 8460 8470 8476 8477 8486 8496 8498 8505 8516 8517 8518 8530 8531 8539 8573 8575 8605 8608 8619 8640 8646 8649 8665 8671 8681 8682 8693 8696 8697 8706 8717 8768 8788 8791 8797 8807 8815 8821 8831 8843 8846 8847 8850 8855 8857 8858 8869 8877 8878 8885 8888 8920 8921 8940 8947 8985 8996 9012 9015 9029 9040 9056 9057 9075 9079 9081 9117 9121 9126 9139 9141 9143 9148 9156 9157 9166 9167 9172 9173 9187 9195 9230 9233 9239 9243 9253 9256 9259 9266 9278 9285 9291 9300 9317 9321 9323 9326 9350 9351 9358 9359 9371 9382 9386 9416 9438 9439 9441 9444 9446 9447 9451 9476 9506 9530 9607 9609 9617 9627 9639 9644 9671 9729 9737 9740 9745 9746 9751 9756 9765 9768 9777 9782 9784 9812 9825 9827 9832 9840 9846 9852 9854 9857 9861 9862 9865 9870 9871 9872 9875 9891 9893 9895 9902 9904 9915 9916 9924 9937 9949 9959 10020 10072 10073 10085 10087 10092 10093 10095 10099 10112 10115 10154 10177 10181 10189 10191 10194 10215 10222 10223 10226 10227 10232 10233 10235 10252 10256 10272 10281 10290 10306 10312 10313 10324 10339 10344 10351 10362 10363 10368 10373 10391 10394 10403 10405 10408 10415 10426 10507 10511 10522 10524 10539 10541 10552 10572 10579 10580 10582 10586 10591 10607 10608 10619 10660 10679 10690 10696 10706 10717 10728 10743 10753 10758 10765 10776 10781 10787 10791 10793 10795 10799 10804 10822 10826 10855 10862 10867 10874 10885 10913 10916 10918 10922 10926 10930 10945 10949 10953 10966 10992 11001 11015 11016 11048 11060 11082 11087 11109 11112 11116 11135 11137 11140 11151 11163 11200 11202 11205 11207 11213 11225 11226 11227 11236 11237 11251 11263 11270 11285 11289 11301 11329 11337 11348 11351 11358 11361 11376 11402 11416 11421 11434 11442 11445 11446 11449 11452 11455 11469 11470 11484 11499 11502 11506 11514 11549 11571 11573 11574 11589 11593 11600 11795 11812 11813 11826 11855 11882 11915 11924 11940 11968 12290 12375 12379 12393 12395 12396 12405 12527 12554 12557 12576 12820 12821 12823 12825 12868 13426 13564 13659 13681 13684 13777 13808 14157 14168 14573 14584 14911 14993 14995 14998 15894 15918 16032 16269 16276 16281 16295 17228 17249 17253 17293 17299 17306 17308 17319 17321 17322 17368 17370 17495 17510 17515 17517 17523 17561 17564 17663 17726 17727 17745 17748 17750 17754 17755 17756 17758 17764 17765 17766 17770 17771 17773 17774 17807 17809 17810 17811 17813 17815 17816 17820 17821 17827 17830 17833 17835 17840 17857 17858 17912 17913 17982 17997 17999 18004 18010 18012 18014 18018 18019 18023 18024 18025 18026 18028 18029 18030 18033 18063 18070 18072 18073 18075 18076 18077 18088 18090 18091 18096 18098 18170 18177 18365 18381 18386 18394 18402 18413 18510 18537 18544 18590 18612 18618 18687 18767 18771 18774 18777 18778 18779 18780 18782 18785 18786 18787 18789 18792 18795 18798 18830 18833 18835 18842 18853 18856 18858 18860 18861 18882 19007 19023 19028 19029 19030 19032 19034 19036 19038 19045 19049 19056 19086 19091 19097 19100 19105 19115 19116 19117 19120 19122 19136 19202 19269 19271 19335 19384 19388 19403 19412 19417 19418 19426 19537 19596 19597 19608 19610 19689 19691 19733 19735 19745 19751 19752 19754 19760 19762 19943 20002 20036 20154 20169 20170 20171 20249 20250 20273 20276 20277 20286 20322 20328 20452 21772 21780 21783 21821 21824 21846 21852 21858 21866 21966 21971 21973 21975 21981 22001 22002 22009 22010 22011 22014 22341 22351 22352 22355 22362 22366 22389 22390 22490 22515 22516 22517 22737 22739 22740 22742 22884 22885 22926 22927 22945 22951 23052 23053 23059 23062 23073 23181 23183 23185 23186 23190 23192 23194 23195 23196 23198 23202 23205 23208 23209 23211 23212 23217 23234 23342 23352 23354 23418 23464 23466 24055 24060 24249 25290 25291 25313 25316 25329 25331 25333 25341 25517 25531 25567 25592 25688 25691 25847 25848 25915 25916 25930 25932 25933 25934 25941 25942 25945 25947 25949 25990 26000 26007 26023 26024 26031 26041 26042 26051 26064 26069 26083 26094 26102 26112 26121 26124 26158 26165 26170 26193 26200 26203 26207 26219 26222 26231 26247 26255 26260 26263 26268 26273 26284 26289 26320 26327 26328 26344 26349 26371 26376 26390 26391 26401 26427 26431 26434 26463 26466 26468 26478 26500 26527 26542 26556 26561 26563 26567 26571 26574 26587 26606 26621 26948 26949 26952 26955 26959 26960 26961 26966 26971 26974 26978 26979 26981 26987 26988 26994 27007 27025 27035 27045 27046 27063 27073 27078 27110 27114 27130 27135 27218 27226 27233 27235 27247 27248 27255 27256 27258 27260 27262 27290 27300 27301 27309 27311 27313 27332 27335 27336 27341 27348 27352 27358 27360 27367 27372 27384 27393 27397 27398 27414 27415 27421 27424 27428 27432 27461 27478 27479 27481 27482 27486 27491 27504 27509 27511 27537 27538 27541 27543 27565 27574 27585 27611 27619 27640 27643 27655 27667 27676 27683 27693 27759 27807 27809 27818 27843 27844 27864 27881 27890 27900 27904 27909 27921 27925 27933 27941 27952 27972 28003 28004 28006 28013 28028 28034 28060 28067 28094 28124 28139 28141 28144 28151 28157 28161 28170 28173 28177 28188 28194 28203 28205 28225 28256 28264 28272 28276 28283 28286 28290 28292 28294 28309 28315 28317 28330 28332 28334 28344 28352 28354 28396 28411 28413 28436 28459 28473 28475 28484 28490 28492 28495 28496 28503 28506 28507 28531 28532 28550 28553 28563 28569 28570 28579 28584 28589 28598 28607 28637 28639 28653 28667 28668 28670 30029 30033 30035 30038 30041 30042 30044 31295 31316 31322 31324 31345 31354 31378 31387 31389 31394 31403 31404 31407 31427 31432 31438 31447 31449 31451 31458 31474 31529 31613 31614 31615 31624 31627 31630 31631 31634 31649 31652 31668 31672 31689 31691 31692 31716 31717 31730 31882 31904 32098 32102 32408 32409 32412 32415 32431 32458 32481 32494 32506 32508 32511 32547 32553 32672 32674 32702 36732 36774 36778 36794 36804 36809 36813 36862 36863 45054 48882 49011 49016 49022 49079 49091 49095 49112 49120 49122 49123 49129 49150https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/144/93?format=asciidefaultJ/AJ/144/93/tableParameters for 1756 close WD+dM pairsFiberSDSS fiberIDmeta.noteintGALEX? GALEX object IDmeta.idnullablee_Vsys[2/451]? Error on Vsyskm/sstat.errorfloatnullableMt[0/9.5] M dwarf spectral typesrc.spTypefloatSeq[0/1801] Catalog numbermeta.id;meta.mainintprimarySDSS? SDSS DR7/DR8 objidmeta.idnullableMJDSDSS mjd numbertime.epochintPlateSDSS plate numbermeta.id;instr.plateintUKIDSS? UKIDSS object IDmeta.idnullableRAJ2000SDSS Right ascension (J2000.0)degpos.eq.ra;meta.mainDEJ2000SDSS Declination (J2000.0)degpos.eq.dec;meta.mainRAgdeg? GALEX Right ascension (J2000.0)degpos.eq.ranullableDEgdeg? GALEX Declination (J2000.0)degpos.eq.decnullableRAudeg? UKIDSS Right ascension (J2000.0)degpos.eq.ranullableDEudeg? UKIDSS Declination (J2000.0)degpos.eq.decnullableRA2deg? 2MASS Right ascension (J2000.0)degpos.eq.ranullableDE2deg? 2MASS Declination (J2000.0)degpos.eq.decnullableWDWhite dwarf type: DA or DBsrc.spTypecharTwd[6000/100000] Effective temperature of White DwarfKphys.temperature.effectiveintlogg[5/9] Surface gravity of White Dwarflog(cm.s**-2)phys.gravityfloatHa[0/2] H{alpha} Magnetic activity flag (1)meta.codeintEWHa[-330/163] H{alpha} equivalent width0.1nmspect.line.eqWidth;em.line.Halphadoublee_EWHaError on EWHa (limited to 10^3^ at CDS)0.1nmstat.errorfloatHaS/N[-4/108] H{alpha} equivalent width S/Nstat.snrfloatLHa/bol[-1.e-2/0.08] H{alpha} luminosity relative to bolometric luminosityphys.luminosity;arith.ratiodoublee_LHa/bolError on LHa/bolstat.errordoubleVdM[-992/609] M dwarf radial velocitykm/sspect.dopplerVeloc;em.IR.4-8umfloate_VdM[4/620]? Error on Vdkm/sstat.errorfloatnullableVwd[-325/566] WD radial velocitykm/sspect.dopplerVeloc;pos.heliocentricfloate_Vwd[3/800]? Error on Vwdkm/sstat.errorfloatnullableVsys[-450/800] System radial velocitykm/sspect.dopplerVeloc;pos.heliocentricfloatSep[0.002/100000] System separationAUpos.angDistancedoublee_Sep[0.001/]? Error on Sep (limited to 10^5^AU ~ 0.5pc at CDS)AUstat.errordoublenullablePer[0.04/] System orbital period (limited to 10^6^yr at CDS)dtime.perioddoubleD[0/11261]? Spectroscopic distance (2)pcpos.distance;pos.parallax.spectfloatnullableZ[-2407/10441]? Height above Galactic planepcpos.cartesian.z;pos.galacticdoublenullableTc[6000/91000]? WD effective temperature (3)Kphys.temperature.effectiveintnullablee_Tc[181/6884]? Error on Tc (3)Kstat.errorintnullableloggc[7.4/9]? WD gravity surface (3)log(cm.s**-2)phys.gravityfloatnullablee_loggc[0.02/0.9]? Error on loggc (3)log(cm.s**-2)stat.errorfloatnullableMc[0.45/1.21]? Estimated WD mass (3)solMassphys.massfloatnullablee_Mc[0.008/0.5]? Error on Mc (3)solMassstat.errorfloatnullabletc[2/2211]? Estimated WD cooling time (3)Myrtime.epochfloatnullablee_tc[0.1/1609]? Error on tc (3)Myrstat.errorfloatnullableS/Nc[1.4/108]? Estimated signal-to-noise ratiostat.snrfloatnullableSpInteractive spectrum from SDSSmeta.ref.urlcharSloanDisplay the SDSS data for this objectmeta.ref.urlcharAllVSearch whole VizieR for known detailsmeta.ref.urlchar