J/A+A/690/A243ivo://CDS.VizieR/J/A+A/690/A243doi:10.26093/cds/vizier.36900243CDSSchwope A.D.Knauff K.Kurpas J.Salvato M.Stelzer B.Stuetz L.,Tubin-Arenas D.2025-12-30T16:01:37Z2024-10-18T09:35:52ZCDS support team

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

cds-question@unistra.frvariable-starscataclysmic-variable-starsx-ray-sourcesstellar-distanceWe present an account of known cataclysmic variables (CVs) that were detected as X-ray sources in eROSITA X-ray surveys and have Gaia DR3 counterparts. We address standard CVs with main sequence donors and white dwarfs accreting via Roche-lobe overflow (RLOF) and related objects, the double degenerates (DDs), and the Symbiotic Stars (SySts). We discern between non-magnetic (dwarf novae and nova-likes) and magnetic CVs (polars and intermediate polars, IPs). In the publically available eROSITA catalog from the recent DR1, typically 65% of known cataloged and classified CVs are detected. This fraction rises to over 90% if the stack of all eROSITA X-ray surveys (called S45 in this paper) is considered and the search volume is restricted to a radius of 500pc. We examine the various classes of CVs in various diagnostic diagrams relating X-ray and optical properties (luminosity, absolute magnitude, color, X-ray spectral hardness, optical variability) and establish their average class properties. We derive spectral properties for the 22 brightest polars and confirm an increase in the ratio of soft to hard X-rays with increasing magnetic field in the accretion region. We report three new soft IPs and present a spectral analysis of all soft IPs. Their blackbody temperatures agree well with published values. The DDs represent the bluest and faintest sub-category but reach the same identification fraction as the standard CVs. The SySts are the most distant systems; only 20 (13%) were detected as X-ray sources in S45, and seven of those are first-time detections. Using an upper limit flux of the non-detected CVs we investigate their mean properties. Their X-ray non-detection is a distance effect in the first place. All the combined properties were used to select candidate CVs for all-sky optical identification programs with the ultimate aim to compose large CV samples to better constrain the impact of magnetic fields on the evolution of CVs, to derive space densities, luminosity functions, and quantify the contribution of white-dwarf accreting systems to the Galactic Ridge X-ray Emission (GRXE). The results of the optical identification program will be presented in forthcoming papers.2024A&A...690A.243Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/690/A243CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toI/355 : Gaia DR3 Part 1. Main source (Gaia Collaboration, 2022)J/A+A/682/A34 : SRG/eROSITA all-sky survey catalogs (eRASS1) (Merloni+, 2024)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/690/A243https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/690/A243http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/690/A243https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/690/A243https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/690/A243http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/690/A243GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/690/A243/tablea1 (Known cataloged CVs with Gaia DR3 entries detected in eROSITA DR1)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/690/A243/tablea1?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/690/A243/tablea1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/690/A243/tablea1?GETtext/xml+votable180.050000true0.207019306853-77.31580495714520.0055555555555555566/4129 4134 4138 4144 4173 4195-4196 4273 4279 4294 4296 4341 4348 4356 4367 4453 4515 4604 4607 4622 4655 4689 4723 4726 4740 4782 4790 4804 4828 4859-4860 4905 4964 4975-4976 4988 5062 5110 5115 5120 5129 5153 5210 5307 5345 5650 5779 6170 6193 6223 6237 6257 6274 6530 6668 8330 16394 20522-20523 20561 20616 20618 20653 20678 20730 20769 20773 20805 20847 20893 20940 21006 21111 21194 21410 21443 21476 21553 21567 21572 21576 21603 21634-21635 21685 21823 21879 21911 21966 21994 22020 22062 22129 22140 22145 22150 22166 22197 22240 22321 22424 22457 22464 22485 22573 22606 22683 22771 22813 22828 22838 22869 22890 22894 22900-22901 22946 22958 22977 23050 23056 23070 23119 23152 23199 23301 23377 23432 23435 23759 23767 23773 23861 23924 23953 24061 24086 24097 24111 24113 24164 24217 24222 24275 24288 24348 24417 24604 24655 24731 24895 24897 24911 25010 25053 25138 25163 25232 25359 25452 25481 25548 25566 25577 25636 25683 25709 25783 25909 25934 26171 26207 26287 26316 26446 26588 26645 26748 26780 26818 26835 26916 27004 27143 27204 27264 27294 27309 27313 27362 27377 27386 27426 27480 27482 27545 27779 27956 27975 27982 28047 28104 28194 28221 28333 28396 28710 28842 28849 29184 29217 29221 31361 32798 32862 32901 33067 33282 33360 33378 33403 33446 33498 33546 33713 33765 33822 33856 33866 33883 34004 34007 34049 34066 34097 34139 34191 34297 34655 34950 34961 35165 35332 35824 35935-35936 36008 36129-36130 36180-36181 36221 36234 36359 36364 36471 36568 36707 36721 36910 36941 37000 37022 37087 37212 37252 37328 37366 37385 37462 37504 37622 37866 37891 37968 38139 38285 38290 38312 38352 38361 38364 38495 38502 38619 38651 38737 38806 39023 39192 39213 39253 39397 39434 39459 39753 39775 39851 40036-40037 40113 40131 40165 40201 40219 40255 40271 40283 40293 40341 40355 40401 40472 40490 40520 40578 40635 40640 40764 40830 40896 40925 41210 41214 41311 41384 41599 41647 41754 41823 41860 41876 42171 42174 42289 42324 42342 42347 42382 42386 42392-42393 42493 42508 42547 42630 42653 42748 42825 42867 42910-42911 42973 43020 43050 43086-43087 43129 43139 43321 43360 43398 43403 43444 43447 43458 43463 43476 43548 43606 43656 43660 43696 43722 43724 43733 43804 43810 43882 43908 43947 44090 44116 44245 44278 44518 44614 44682 44705 44814 44846 44926 44992 45098 45417 45454 45546 45580 45635 45671 45821 45854 45973 46002 46130 46500 46650 46739 47161 47181 47525 47786 478001.9867573869263685e-19 3.916500758235022e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/690/A243?format=asciiX-raydefaultJ/A+A/690/A243/tablea1Known cataloged CVs with Gaia DR3 entries detected in eROSITA DR1recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint1eRASSIAUNAME of eRASS1 source, 1eRASS JHHMMSS/s+DDMMSSmeta.id;meta.maincharCVNameNsme of CVmeta.idcharCVtypeSubtype of CVsrc.classcharGaiaDR3Associated Gaia source IDmeta.idDetUidString unique detection IDmeta.idcharRAJ2000X-ray right ascension (J2000)degpos.eq.ra;meta.mainDEJ2000X-ray declination (J2000)degpos.eq.dec;meta.mainSepPositional offset X-ray to opticalarcsecpos.angDistancedoubleMLcts1Number photons in eRASS1ctphot.count;em.X-raydoubleMLFlux1Associated flux in eRASS1 (0.2-2.3keV)mW.m**-2phot.flux;em.X-raydoubleGmagGaia G-band magnitudemagphot.mag;em.optdoubleDistDistance to CV according to Bailer-Jones et al., 2021AJ....161..147B, Cat. I/352pcpos.distancedoublelogLXlog(X-ray luminosity) (0.2-2.3keV)log(1e-07W)phys.luminosity;em.X-raydoublelog(FX/Fopt)log(X-ray to optical flux ratio)phot.flux;arith.ratiodoublegMAGAbsolute G-band magnitudemagphot.magdoubleBp-RpGaia color Bp-Rpmagphot.color;em.opt.B;em.opt.RdoubleSimbadNameSimbad column added by the CDSmeta.idcharnullable