J/ApJS/188/473ivo://CDS.VizieR/J/ApJS/188/473doi:10.26093/cds/vizier.21880473CDSNichols J.S.Henden A.A.Huenemoerder D.P.Lauer J.L.Martin E.,Morgan D.L.Sundheim B.A.2017-06-30T05:47:45Z2010-09-13T13:06:51ZCDS support team

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

cds-question@unistra.frvariable-starssurveysx-ray-sourcesVariable stars have been identified among the optical-wavelength light curves of guide stars used for pointing control of the Chandra X-ray Observatory. We present a catalog of these variable stars along with their light curves and ancillary data. Variability was detected to a lower limit of 0.02mag amplitude in the 4000-10000{AA} range using the photometrically stable Aspect Camera on board the Chandra spacecraft. The Chandra Variable Guide Star Catalog (VGUIDE) contains 827 stars, of which 586 are classified as definitely variable and 241 are identified as possibly variable. Of the 586 definite variable stars, we believe 319 are new variable star identifications. Types of variables in the catalog include eclipsing binaries, pulsating stars, and rotating stars. The variability was detected during the course of normal verification of each Chandra pointing and results from analysis of over 75000 guide star light curves from the Chandra mission. The VGUIDE catalog represents data from only about 9 years of the Chandra mission. Also, guide stars were often used multiple times for Chandra observations, so many of the stars in the VGUIDE catalog have multiple light curves available from various times in the mission. The catalog is presented as both online data associated with this paper and as a public Web interface. The stars available for use as Chandra guide stars are generally 6-11mag and are commonly spectral types A and later. Statistics of variability compared to spectral type indicate the expected dominance of A-F stars as pulsators. Eclipsing binaries are consistently 20%-30% of the detected variables across all spectral types.2010ApJS..188..473Nhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJS/188/473CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toB/gcvs : General Catalogue of Variable Stars (Samus+ 2007-2010)http://cxc.harvard.edu/vguide/ : Chandra VGuide home pagehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJS/188/473https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJS/188/473http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJS/188/473https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJS/188/473https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJS/188/473http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJS/188/473GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJS/188/473/table4 (The VGuide catalog)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/188/473/table4?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/188/473/table4?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/188/473/table4?GETtext/xml+votable180.050000true0.5270.41536110.0055555555555555566/1 131 311 407 421 465 550 634 651 708 911 958 1058 1109 1169 1287 1296 1302 1307 1504 1539 1542 1545 1649 1661 1663 1694 1791 1796 1985 1986 2010 2099 2133 2155 2233 2234 2241 2247 2281 2332 2354 2375 2380 2387 2404 2432 2575 2619 2708 2709 3030 3094 3096 3098 3156 3163 3178 3426 3475 3633 3649 3651 3662 3684 3819 3898 3968 4231 4310 4412 4592 4643 4647 4652 4660 4672 4688 4689 4799 4853 4979 5044 5156 5212 5267 5335 5353 5367 5430 5609 5611 5637 5650 5653 5740 5819 5909 5911 5948 6008 6042 6069 6086 6348 6365 6367 6379 6382 6426 6498 6539 6593 6643 6666 6721 6755 6758 6778 6807 6810 6881 6887 6913 6940 7011 7026 7183 7225 7297 7372 7391 7412 7546 7610 7612 7632 7642 7664 7681 7687 7861 7882 8124 8220 8266 8399 8421 8426 8477 8648 8911 9039 9049 9063 9145 9146 9147 9148 9149 9151 9173 9293 9363 9382 9395 9507 9513 10172 10293 10312 10324 10354 10396 10401 10484 10512 10513 10516 10518 10775 10824 10927 10968 10979 11027 11081 11082 11231 11382 11385 11428 11626 11807 11892 11947 12321 12422 12571 12642 12752 12847 12968 12977 12980 13014 13020 13309 13328 13511 13565 13743 13761 13762 13770 13771 13875 13878 13946 13947 13950 14085 14191 14199 14255 14279 14290 14431 14441 14443 14455 14586 14602 14632 14682 14692 14702 15332 15484 15554 15644 15660 15681 15684 16034 16145 16197 16277 16441 16532 16534 16647 16954 17119 17120 17262 17290 17312 17313 17491 17514 17575 17618 17755 17850 17918 18001 18004 18090 18109 18135 18208 18270 18287 18299 18347 18350 18559 18668 18683 18884 18968 19031 19033 19035 19346 19422 19548 19577 19580 19777 19844 19935 19943 20064 20065 20071 20096 20148 20179 20199 20270 20440 20492 20542 20573 20579 20612 20744 21156 21211 21398 21433 21439 21451 21593 21624 21727 21737 21760 21788 21812 21925 21946 22078 22147 22192 22201 22239 22423 22497 22741 22759 22769 22805 22806 22849 22857 22861 22863 22873 22921 23072 23086 23134 23172 23300 23349 23395 23591 23604 23638 23639 23652 23686 23698 23800 23856 23900 23915 23941 23959 23981 23992 23995 24014 24026 24108 24174 24183 24184 24340 24375 24383 24418 24460 24521 24563 24653 24687 24893 24950 24975 24977 25058 25083 25100 25166 25211 25217 25221 25238 25261 25300 25335 25422 25549 25569 25689 25782 25793 25912 26023 26097 26169 26183 26189 26209 26217 26292 26293 26304 26463 26553 26643 26720 26721 26926 26945 26967 26979 27010 27017 27021 27096 27140 27147 27213 27233 27234 27314 27392 27406 27442 27515 27536 27612 27761 27765 27767 27852 27870 27873 27906 27942 28131 28174 28197 28251 28288 28345 28423 28431 28452 28457 28471 28496 28516 28582 28585 28593 28619 28634 28667 28708 28716 28723 28738 28745 28747 28751 28769 28799 28807 28808 28818 28819 28822 28827 28828 28829 28830 28849 28852 28872 28876 28877 28879 28884 28888 28892 28896 28898 28901 28925 28953 29057 29071 29073 29094 29096 29097 29116 29134 29176 29216 29256 29257 29298 29317 29353 29398 29460 29506 29509 29520 29604 29664 29718 29872 29878 29992 30219 30222 30246 30256 30258 30320 30321 30341 30366 30403 30404 30415 30510 30527 30558 30622 30629 30657 30688 30695 30719 30745 30755 30806 30842 30901 30908 30950 31075 31127 31148 31153 31154 31164 31169 31201 31313 31315 31316 31439 31461 31465 31515 31558 31617 31620 31748 31907 31975 32065 32500 32523 32695 33097 33098 33100 33108 33121 33192 33193 33488 33778 33865 33905 34013 34095 34208 34418 34461 34534 34790 35241 35304 35535 35536 35537 35698 35720 35935 36099 36164 36231 36243 36546 36583 36774 36959 37045 37232 37364 37719 37871 37887 37924 37926 37930 37931 37938 38016 38017 38018 38457 38577 38682 38703 38888 38984 39077 39216 39238 39240 39241 39266 39359 39404 39739 39825 39833 39838 39853 39936 40292 40429 40433 40446 40489 40501 40582 40712 40719 40730 40752 40754 40776 40872 40904 40988 41128 41270 41277 41279 41516 41573 41577 41661 41685 41760 41763 41780 41794 41813 41845 41976 42078 42118 42139 42172 42183 42186 42195 42212 42314 42350 42369 42373 42382 42385 42397 42444 42458 42467 42470 42480 42527 42665 42666 42764 42948 42970 42990 43008 43021 43107 43260 43262 43365 43417 43522 43604 43676 43769 43777 43803 43810 43973 44052 44188 44271 44284 44356 44948 45468 45647 45905 45945 46103 46135 46146 46164 46439 46538 46546 46599 46608 46840 46841 46862 46890 46911 47014 47017 47047 47168 47223 47247 47330 47357 47359 47473 47516 47663 47749 47799 47815 47819 47830 47842 47855 47893 48025 48033 48048 48388 48501 48529 48539 48561 48617 48620 48912 49127https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJS/188/473?format=asciiX-raydefaultJ/ApJS/188/473/table4The VGuide catalogrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintAGASCIDChandra Guide Star Catalog (AGASC) IDmeta.id;meta.mainlongSIMBADSimbad star namemeta.idcharRAJ2000AGASC Hour of Right Ascension (J2000)pos.eq.ra;meta.mainDEJ2000AGASC Degree of Declination (J2000)pos.eq.dec;meta.mainOTypeSimbad long object typesrc.classcharSpTypeSimbad spectral typesrc.spTypecharotypSimbad star short type (defined in OType)src.classcharVarVariability Category (1)meta.code;src.varcharVclassVariability Classification (as defined in B/gcvs)meta.code;src.varcharEpoch? Epoch of Variabilitydtime.epochdoublenullablePeriod? Period of Variabilitydtime.perioddoublenullableUV[Y/N] Ultra-Violet Sourcemeta.codecharX[Y/N] X-Ray Sourcemeta.codecharIR[Y/N] Infra-Red Sourcemeta.codecharNumNumber of Chandra observations (2)meta.numberintExpTotal Chandra observation time (2)kstime.epochintKn[Y/N] Previously Known Variablemeta.codecharStatusVGuide Status of Star (suspect or accepted)meta.codechar