J/A+A/672/A176ivo://CDS.VizieR/J/A+A/672/A176doi:10.26093/cds/vizier.36720176CDSPesta M.Pejcha O.2024-11-28T20:02:57Z2023-04-19T08:43:51ZCDS support team

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

cds-question@unistra.freclipsing-binary-starsastronomical-modelsphotometryvisible-astronomyThe mass ratio q of a contact binary star evolves due to mass transfer, magnetic braking, and thermal relaxation oscillations to small values until it crosses a critical threshold q_min_. When that happens, the binary undergoes the tidal Darwin instability, leading to a rapid coalescence of the components and observable brightening of the system. So far, the distribution of $q$ has not been measured on a sufficiently large population of contact binary stars, because the determination of q for a single contact binary usually requires spectroscopy. But as was shown previously, it is possible to infer the mass-ratio distribution of the entire population of contact binaries from the observed distribution of their light curve amplitudes. Employing Bayesian inference, we obtain a sample of contact binary candidates from the Kepler Eclipsing Binary Catalog combined with data from Gaia and estimates of effective temperatures. We assign to each candidate a probability of being a contact binary of either late or early type. Overall, our sample includes about 300 late-type and 200 early-type contact binary candidates. We model the amplitude distribution assuming that mass ratios are described by a power law with an exponent $b$ and a cut off at q_min_. We find q_min_=0.087^+0.024^_-0.015_ for late-type contact binaries with periods longer than 0.3 days. For late-type binaries with shorter periods, we find q_min_=0.246^+0.029^_-0.046_, but the sample is small. For early type contact binary stars with periods shorter than 1 day, we obtain q_min_=0.030^+0.018^_-0.022_. These results indicate a dependence of q_min_ on the structure of the components and are broadly compatible with previous theoretical predictions. We do not find any clear trends in b. Our method can be easily extended to large samples of contact binaries from TESS and other space-based surveys.2023A&A...672A.176Phttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/672/A176CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toIV/34 : K2 Ecliptic Plane Input Catalog (EPIC) (Huber+, 2017)J/AJ/151/68 : Kepler Eclipsing Binary Catalog - Third Revisionhttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/672/A176https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/672/A176http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/672/A176https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/672/A176https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/672/A176http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/672/A176GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/672/A176/table1 (Contact binary candidates in the Kepler Eclipsing Binary Catalog)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/672/A176/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/672/A176/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/672/A176/table1?GETtext/xml+votable180.050000true291.044041736.72922220.0055555555555555564/922-923 933-935 944-946 5/71 1174 1180 3645-3647 3683 3704 3706 3729-3731 3788-3789 3792 6/260 269 272-273 277 281 283 292 301 303 307 313-314 316-317 319 328 335 340 354-355 357 359 361 365 369 379 402-403 405 407 410 413 437 448 453-455 462 474-475 478 483-485 4247 4254-4255 4262-4263 4269 4271 4275-4276 4278 4280 4282 4286-4287 4295-4296 4298 4300-4301 4303 4306 4313-4314 4328 4330 4334 4338 4523 4526 4621 4623-4626 4628 4630 4634 4658-4661 4663 4665 4670 4672 4675-4676 4679 4687-4689 4693-4695 4700-4701 4707 4710-4711 4715-4717 4719 4724 4727 4730 4732 4800-4801 4816-4817 4872 4874-4875 4878 4897 14567 14573 14575 14577-14579 14730-14731 14738 14744 14746 14749-14751 14792 14794-14795 14828 14830 14914-14915 15040-15041 15044-15045 15057 15059-15062 15160-15161 15172-15173 15175-15176 15178 15232 17082 17310 17329 17365 17394-17395 18087 18436 18441-18442 18444-18445 18449-18450 18457-18459 18464 18468 18476 18483-18484 18490 18508 18510 18536 18560-18561 18563 18570 18579 18586-18587 18590 18609-18610 18617 18621 18631 18643 18649 18659-18660 18662-18663 18708 18717 18756 18758 18760 18777 18796-18797 19472 23483 23523 23531-23532 23797 23853 23857 23859 23861-23862 23864 23907 23909 23937 23943 23947 23949 23951 23953-23954 23958-23959 23961 23969 23971 23977 23980-23982 23985 23987 23998 24003 24013 24027 24030 24037 24039 24044 24056-24057 24327 24335-24336 24338 24340-24341 24343-24344 24349 24373 24384-24386 24389 24391 24402 25578 25586 26899 26901 26903 26928 26935 26942 26955 26958 26971 26974 26978 26983 26989 26992 26996 27006 27029 27031 27074 27077-27078 27080-27081 27088-27089 27091 27096 27120-27121 27661 27680 27693 27783 27786 27788 29346 29350-29351 29354 29360 30728 30734 30752 42861-42862 42874 42879 42910 42939 42945 42965 42967 42980 42985 42989 43003 44307 44319 44352 44362 44366 44368 44375 44383-44385 44387 44393 44406 44409 48597 48605https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/672/A176?format=asciiOpticaldefaultJ/A+A/672/A176/table1Contact binary candidates in the Kepler Eclipsing Binary CatalogSimbadNameSimbad column added by the CDSmeta.idcharnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintKIC/EPICKepler Input Catalog ID/Ecliptic Plane Input Catalog ID (1)meta.id;meta.mainlongAmpPhotometric amplitudemagsrc.var.amplitudedoublee_Amp? Photometric amplitude uncertaintymagstat.errordoublenullableProbLateProbability of being a contact binary of late typestat.fit.goodnessfloatProbEarlyProbability of being a contact binary of early typestat.fit.goodnessfloat_RAPositions from KIC and EPIC (right ascension part)degpos.eq.ra;meta.main_DEPositions from KIC and EPIC (declination part)degpos.eq.dec;meta.main