J/other/RAA/19.9ivo://CDS.VizieR/J/other/RAA/19.98doi:10.26093/cds/vizier/dx/bjkjiCDSHe L.Wang S.Xu X.-J.Soria R.Liu J.-F.Li X.-D.Bai Y.Bai Z.-R.,Guo J.-C.Qiu Y.-L.Zhang Y.Xu R.-C.Qian K.-C.2026-02-10T20:07:44Z2019-09-12T14:33:32ZCDS support team

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

cds-question@unistra.frlate-type-starsx-ray-sourcesX-ray emission is an important indicator of stellar activity. In this paper, we study stellar X-ray activity using the XMM-Newton and LAMOST data for different types of stars. We provide a sample including 1259 X-ray-emitting stars, of which 1090 have accurate stellar parameter estimations. Our sample size is much larger than those used in previous works. We find a bimodal distribution of the X-ray to optical flux ratio (log(fX/fV)) for G and K stars. We interpret that this bimodality is due to two subpopulations with different coronal heating rates. Furthermore, using the full widths at half maxima calculated from H{alpha} and H{beta} lines, we show that these stars in the inactive peaks have smaller rotational velocities. This is consistent with the magnetic dynamo theory that presumes stars with low rotational velocities have low levels of stellar activity. We also examine the correlation between log(fX/fV) and luminosity of the excess emission in the H{alpha} line, and find a tight relation between the coronal and chromospheric activity indicators.2019RAA....19...98Hhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/other/RAA/19.98CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toIX/46 : XMM-Newton Serendipitous Source Catalogue 3XMM-DR5 (XMM-SSC, 2016)V/153 : LAMOST DR4 catalogs (Luo+, 2018)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/other/RAA/19.98https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/other/RAA/19.98http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/other/RAA/19.98https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/other/RAA/19.98https://vizier.iucaa.in/viz-bin/votable?-source=J/other/RAA/19.98http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/other/RAA/19.98GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/other/RAA/19.98/table2 (Stellar parameters for the sources)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/other/RAA/19.98/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/other/RAA/19.98/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/other/RAA/19.98/table2?GETtext/xml+votable180.050000true9.873833740.0832480.0055555555555555566/50 149 247 295 301 306 342 351 474 485 496 595 611 615 757 857 859 871 880 924 948 988 1006 1025 1031 1034 1048 1050 1073 1075 1082 1114 1133 1154 1168-1169 1171 1196-1198 1263 1287 1293 1387 1466 1468 1506 1539 1677 1679 1685 1688 1700-1701 1712 1805 1841 1845 1847 2098 2110 2132 2134 2154-2155 2227 2229 2231-2232 2240-2241 2248 2251 2266 2395 2409-2411 2414 2436-2437 2464 2466 2549 2564 2600 2619 2622-2623 2631 2634 2658 2666-2667 2704-2705 2708-2710 2735 2752-2753 2789 2866 2922 2970 2994 3136 3193 4118 4123-4124 4163 4181 4206 4221 4227 4303 4312-4314 4325 4327 4340-4341 4344-4345 4352 4403 4511 4536 4653 4690 4695 4698 4748 4750 4759 4765 4790 4804 4831 4834-4835 4838 4859 4870 4954-4955 4961 4964-4965 4967 4976 4992 5009 5017-5018 5063 5080 5116 5118 5241 5312 5358 5367 5369 5482 5560 5568 5616 5629 5670 5682 5715 5727 5731 5733 5758 5762 5792 5794 5817 5862 5922 5928 5975 5986 6011 6051 6059 6069 6073 6075-6078 6112 6146-6147 6149-6150 6208 6213 6219 6241 6247 6274 6337 6340 6348 6350 6382-6383 6417 6441 6472 6495 6532-6534 6544 6617 6619 6694 6704 6760 6826-6827 6883 6889 6923 7129 7228 7235 7241-7242 7266 7273 7301 7303 8220 8264 8268 8324 8339 8675 8687 8694 8705 8843 8845 8941 8943 8945 8952 8956 8969 9018 9060 9099 9112 9146-9147 9175 9231 9242 9302 9343 9353-9354 9401 9459 9495 9747 9750 9771 9831 9997 10037 10039 10145 10169 10182-10183 10190 10265 10303 10306 10375 10378-10379 10383 10386 10401 10414 10444 10484-10485 10517 10560 10598 10630 10644 10657 10659 10706 10708 10761 10763 10817 10841 10896 10912 10979 11027 11029 11111-11112 11158 11204 11206 11208 11288 11347 11353 11375 11377 11434 11436 12727 12796 13387 13511 13522 13529 13707 13743 13750 13789 14018 14175 14227 14261 14619 14641 14643 14646 14670 14684 14692-14694 14696-14697 14700 14704 14707 14751-14754 14772-14773 14816 14949 14960 15112 15121 15169 17667 17670-17671 17679 17682 17767 17772 17812 17866-17867 18003 18011 18038 18099 18110 18153 18431 18643 18668 18779 18791 18894 18897 18902-18903 19025 19032-19033 19036 19094 20021 20073 20075 20083 20168 20292 20323 20384 20386 20460 21432-21433 21435 21438-21439 21785 21870 21873 21916 21997 22093 22129 22154 22247 22252-22253 22264 22289 22373 22517 22722 22804-22805 22851 22854-22855 22860 22862 22866 22872-22873 22895 22964 22972 22975 23028 23149 23166 23190 23222-23223 23281 23306 23538 23636-23637 23639 23714 23717 23719 23725 23728 23736 23776 23828 23851 23921 23952 23954 23993 24025 24027 24084 24086 24121 24200 24219 24329 24331 24345 24360 24424 24451 24460 24554 24571 24574 25540 25587 25789 25852 25919 26009 26022 26028 26055 26131 26188-26189 26265 26292 26300 26365 26401 26403 26432 26749 26859 26975 26984 27026 27029 27041 27060 27072 27075-27076 27079 27088 27126 27137 27245 27256 27258-27259 27307 27313 27342 27421 27428 27440 27464 27477 27524 27562 27574 27699 27714 27723 27734 27742 27765 27767 27785 27803 27857 27862 27937 27944 27948 28019 28061 28063 28085 28123 28126-28127 28141 28143 28149 28174 28221 28384 28392-28393 28415 28441 28466 28471 28492 28496 28515 28517 28522 28529 28541 31285 31313 31354 31495 31509 31537 31552 31774 31804 31898 31926 32500 40929 40934 40950 40955 40957-40958 45044 49023https://cdsarc.cds.unistra.fr/viz-bin/moc/J/other/RAA/19.98?format=asciiX-raydefaultJ/other/RAA/19.98/table1The X-ray information for the sourcesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintObsIDSpectral ID in LAMOST catalogmeta.id;meta.mainlongFXUnabsorbed flux in band 0.3-3.5keVmW.m**-2phot.flux;em.X-raydoublee_FXrms uncertainty on FXmW.m**-2stat.errordoublelog(FX/FV)X-ray to optical flux ratiophot.flux;arith.ratiofloate_log(FX/FV)rms uncertainty on log(FX/FV)stat.errorfloatHR? EPIC HR using the bands of 0.5-1keV and 1-2keV derived from the 3XMM-DR5 catalogphot.flux;arith.ratiofloatnullablee_HR? rms uncertainty on HRstat.errorfloatnullableJ/other/RAA/19.98/table2Stellar parameters for the sourcesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintXdataindicates X-ray information in table1meta.ref.urlcharObsIDSpectral ID in LAMOST catalogmeta.id;meta.mainlongprimaryRAJ2000Right ascension (J2000)degpos.eq.ra;meta.mainDEJ2000Declination (J2000)degpos.eq.dec;meta.mainTypeStellar subclasssrc.classcharVmagV-band magnitudemagphot.mag;em.opt.Vfloate_Vmagrms uncertainty on Vmagmagstat.error;phot.mag;em.opt.VfloatAVExtinction in the V bandmagphys.absorption;em.opt.VfloatNHHydrogen column density converted from optical extinctioncm**-2phys.columnDensitydoubleTeffEffective temperatureKphys.temperature.effectivefloate_Teffrms uncertainty on TeffKstat.error;phys.temperature.effectivefloatloggSurface gravitylog(cm.s**-2)phys.gravityfloate_loggrms uncertainty on logglog(cm.s**-2)stat.errorfloat[Fe/H]Metallicityphys.abund.Zfloate_[Fe/H]rms uncertainty on [Fe/H]stat.error;phys.abund.Fefloat