J/AJ/132/866ivo://CDS.VizieR/J/AJ/132/866doi:10.26093/cds/vizier.51320866CDSRiaz B.Gizis J.E.Harvin J.2009-07-07T16:55:41Z2009-07-07T16:49:20ZCDS support team

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

cds-question@unistra.frm-starsinfrared-photometryWe present the results from a spectroscopic study of 1063 nearby active M dwarfs, selected by correlating the Two Micron All Sky Survey and ROSAT catalogs. We have derived the spectral types and estimated distances for all of our stars. The spectral types range between K5 and M6. Nearly half of our stars lie within 50pc. We have measured the equivalent width of the H{alpha} emission line. Our targets show an increase in chromospheric activity from early to midspectral types, with a peak in activity around M5. Using the count rate and hardness ratios obtained from the ROSAT catalog, we have derived the X-ray luminosities. Our stars display a "saturation-type" relation between the chromospheric and coronal activity. The relation is such that log(LX/Lbol) remains "saturated" at a value of approximately -3 for varying H{alpha} equivalent width. We have found 568 matches in the USNO-B catalog and have derived the tangential velocities for these stars. There is a slight trend of decreasing chromospheric activity with age, such that the stars with higher vtan have lower H{alpha} equivalent widths. The coronal emission, however, remains saturated at a value of log(LX/Lbol)~-3 for varying tangential velocities, suggesting that the coronal activity remains saturated with age. We do not find any break in the saturation-type relation at the spectral type at which stars become fully convective (~M3.5). Most of the stars in our sample show more coronal emission than the dMe stars in the Hyades and Praesepe and have v_tan_<40km/s, suggesting a young population.2006AJ....132..866Rhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/132/866CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toII/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/132/866https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/132/866http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/132/866https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/132/866https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/132/866http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/132/866GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/132/866/table1 (Observed and derived quantities of nearby M stars)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/132/866/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/132/866/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/132/866/table1?GETtext/xml+votable180.050000true3.623166713.51905560.0055555555555555566/225 265 310 358 518 545 546 551 725 772 778 797 838 850 861 1170 1547 2190 2220 2260 2294 2354 2442 2472 2597 2660 2668 2671 2741 2755 2756 2762 3570 3951 4764 6169 6348 6384 6497 6582 6764 6850 6873 6908 6930 6944 6958 7928 8383 8633 8775 8776 8951 9117 9311 9402 9429 9494 9518 9604 9638 9712 9747 9759 9784 9797 9839 9923 9926 9932 9954 10000 10001 10033 10037 10079 10131 10184 10381 10408 10484 10575 10634 10766 10788 10851 10855 10864 10875 10969 11044 11048 11083 11091 11111 11170 11208 11232 11384 11387 11480 11569 11573 11654 11787 11797 11810 11850 11853 11963 11982 12111 12203 12212 12486 12530 12532 12553 12683 12814 13343 13427 13512 13541 13551 13617 13688 13732 14879 14884 14910 14957 15029 15052 15062 15065 15078 15091 15100 15151 15266 15355 16047 16106 16296 16455 16497 16505 16543 16596 16719 16758 16765 16827 16859 16930 16970 16978 16985 16993 16998 17012 17019 17022 17057 17058 17100 17124 17139 17155 17202 17231 17275 17283 17288 17307 17394 17395 17412 17422 17491 17502 17533 17588 17590 17606 17607 17617 17640 17645 17652 17690 17797 17816 17966 17969 18009 18302 18410 18440 18457 18466 18484 18538 18588 18596 18599 18634 18672 18686 18695 18710 18740 18743 18759 18760 18763 18842 18952 18964 18968 18975 18982 19042 19043 19077 19414 19451 19665 19691 19777 19782 19812 19877 19909 19931 19957 20000 20007 20074 20110 20202 20217 20257 20262 20282 20361 20381 20384 20392 20505 20507 20521 20540 20573 20589 20594 20595 20602 20617 20618 20624 20632 20638 20647 20660 20676 20701 20749 20778 20789 20824 20833 20854 20886 20906 20941 20969 21031 21044 21051 21080 21090 21104 21120 21146 21180 21199 21202 21209 21222 21239 21254 21267 21277 21306 21310 21342 21346 21353 21364 21377 21420 21422 21427 21428 21438 21442 21470 21572 21691 21737 22040 22052 22162 22180 22535 22547 22552 22571 22645 22647 22683 22731 22738 22744 22745 22773 22788 22804 22805 22830 22856 22857 22873 22921 22946 23042 23052 23066 23080 23084 23094 23100 23111 24608 24692 24797 24843 24976 25162 25278 25374 25378 25470 25512 25637 25745 26217 26834 26851 26866 26905 27201 27207 27218 27895 28114 28137 28442 28510 28519 28526 28696 28746 28832 28842 28882 28921 28955 28993 29014 29032 29136 29168 29193 29198 29234 29243 29287 29293 29352 29357 29373 29458 29519 29657 29742 29767 29854 29866 29870 29905 29921 29924 29958 29969 30009 30011 30016 30027 30031 30237 30263 30307 30371 30740 30781 30833 30860 30883 30992 31007 32033 32056 32267 32275 32321 32414 32441 32446 32572 32626 32700 32732 32773 32847 32868 32890 32921 33053 33055 33065 33067 33075 33077 33094 33129 33167 33180 33237 33320 33411 33449 33493 33545 33565 33613 33618 33654 33669 33694 33706 33716 33737 33766 33818 33882 33894 33901 33919 33956 33996 34058 34118 34127 34145 34152 34196 34244 34266 34303 34417 34450 34486 34566 34568 34571 34587 34592 34614 34615 34623 34638 34680 34681 34717 34736 34739 34742 34755 34776 34791 35055 35112 35121 35131 35143 35152 35154 35221 35245 35248 35287 35325 35375 35447 35517 35640 35709 35789 35814 35830 35836 35847 35861 35885 35887 35939 35949 36012 36045 36060 36294 36319 36322 36332 36401 36419 36425 36442 36466 36486 36492 36509 36529 36543 36561 36562 36578 36641 36700 36708 36732 36749 36755 36769 36774 36778 36809 36842 36865 36901 36906 36909 36938 36948 36956 36961 36969 36978 37012 37013 37041 37051 37060 37092 37097 37125 37134 37158 37207 37233 37245 37287 37298 37304 37309 37310 37324 37387 37418 37484 37486 37557 37560 37564 37573 37580 37632 37638 37657 37672 37690 37734 37765 37769 37848 37856 37901 37907 37908 37909 38113 38120 38133 38191 38199 38247 38347 38359 38382 38400 38430 38440 38484 38486 38487 38490 38551 38646 38687 38742 38815 38840 38950 38953 39008 39019 39081 39260 39331 39396 39439 39531 39535 39575 39586 39603 39723 39792 39829 39832 39899 39904 39906 40003 40031 40069 40084 40145 40148 40184 40188 40225 40275 40294 40435 40534 40656 40717 40723 40735 40748 40961 40976 41077 41117 41123 41130 41133 41182 41184 41239 41247 41323 41377 41389 41410 41432 41441 41446 41448 41472 41474 41482 41505 41510 41515 41524 41526 41530 41532 41538 41557 41558 41562 41568 41569 41589 41598 41601 41607 41616 41643 41664 41665 41675 41681 41743 41748 41758 41818 41819 41838 41854 41856 41886 41917 41954 42153 42163 42176 42214 42272 42290 42349 42483 42485 42512 42525 42535 42539 42550 42604 42816 42990 42995 43000 43002 43004 43010 43011 43018 43019 43032 43033 43035 43045 43046 43053 43057 43067 43068 43070 43142 43149 43150 43163 43165 43167 43175 43178 43192 43193 43198 43205 43208 43210 43258 43259 43292 43342 43402 43425 43452 43532 43545 43553 43565 43571 43601 43608 43670 43727 43745 43790 43838 43950 43983 43993 44001 44021 44356 44360 44361 44363 44366 44379 44385 44387 44388 44389 44394 44397 44402 44420 44696 44713 44745 44751 44793 45035 45062 45069 45224 45235 45256 45320 45336 45366 45377 45378 45389 45391 45419 45429 45492 45503 45511 45633 45746 45770 45822 45960 46029 46080 46082 46207 46236 46247 46249 46307 46308 46351 46383 46456 46596 46598 46604 46629 46692 46701 46717 46731 46762 46771 46828 46922 46974 47037 47047 47081 47093 47107 47116 47219 47245 47249 47345 47371 47487 47499 47517 47544 47570 47599 47652 47711 47786 47826 47862 47889 47908 47911 47932 47936 47941 47943 47978 48027 48072 48083 48084 48093 48115 48124 48128 48138 48141 48174 48186 48189 48217 48235 48263 48273 48274 48283 48284 48287 48299 48318 48325 48341 48348 48351 48355 48359 48361 48370 48388 48411 48431 48443 48453 48455 48461 48495 48518 48519 48529 48540 48553 48609 48620 48628 48648 48666 48673 48675 48691 48702 48737 48798 48800 48801 48807 48811 48835 48877 48905 48926 48954 48980 48989 48998 49001 49006 49019 49029 49039 49056 49094 49106 49115 49125 49135 49146 49147 491508.650015785639275e-20 1.7003137259100215e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/132/866?format=asciiInfrareddefaultJ/AJ/132/866/table1Observed and derived quantities of nearby M starsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint2MOriginal 2MASS name given in the catalog; some names were corrected at CDS, see the {\bf 2MASS} columnmeta.idchar2MASSActual 2MASS name from the 2MASS final Release (Cat. II/246); 3 names with less digits are however from the 2MASS Intermediate Release (Cat. II/241)meta.id;meta.maincharCaH1? The CaH1 indexmeta.code;spect.indexfloatnullableCaH2? The CaH2 indexmeta.code;spect.indexfloatnullableCaH3? The CaH3 indexmeta.code;spect.indexfloatnullableTiO5The TiO5 index (bandheads at 650 and 705nm)meta.code;spect.indexfloatJmag2MASS J band magnitudemagphot.mag;em.IR.JfloatHmag2MASS H band magnitudemagphot.mag;em.IR.HfloatKmag2MASS K band magnitudemagphot.mag;em.IR.KfloatSpTypeMK spectral type, mainly from TiO5 indexsrc.spTypecharEWHa? H{alpha} equivalent width in Angstroms0.1nmspect.line.eqWidth;em.line.Halphafloatnullablelog(LX/Lbol)Log of the X-ray to Bolometric luminositiesphys.luminosity;arith.ratiofloatVtan? Tangential velocitykm/sphys.veloc.transverseintnullableDistSpectroscopic distancepcpos.distance;pos.heliocentricintpDist? Distance from parallaxpcpos.distanceintnullableONameOther name(s) of the star \linkRole{Simbad data} (2)meta.idcharRXX-ray data from ROSAT All-Sky Surveysmeta.ref.urlchar_RAPosition, from the 2MASS catalog (II/246 or II/241) (right ascension part)degpos.eq.ra;meta.main_DEPosition, from the 2MASS catalog (II/246 or II/241) (declination part)degpos.eq.dec;meta.main