SDSS-DR5 low-mass star spectroscopic sample J/AJ/135/785 ivo://CDS.VizieR/J/AJ/135/785 doi:10.26093/cds/vizier.51350785 CDS West A.A. Hawley S.L. Bochanski J.J. Covey K.R. Reid I.N. Dhital S.,Hilton E.J. Masuda M. 2008-10-19T08:18:56Z 2008-10-19T08:13:18Z CDS support team CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France cds-question@unistra.fr late-type-stars m-stars stellar-spectral-types radial-velocity proper-motions infrared-photometry visible-astronomy broad-band-photometry sloan-photometry We present a spectroscopic analysis of over 38000 low-mass stars from the Sloan Digital Sky Survey (SDSS) Data Release 5 (DR5). Analysis of this unprecedentedly large sample confirms the previously detected decrease in the fraction of magnetically active stars (as traced by H{alpha} emission) as a function of vertical distance from the Galactic Plane. The magnitude and slope of this effect varies as a function of spectral type. Using simple 1-D dynamical models, we demonstrate that the drop in activity fraction can be explained by thin disk dynamical heating and a rapid decrease in magnetic activity. The timescale for this rapid activity decrease changes according to the spectral type. By comparing our data to the simulations, we calibrate the age-activity relation at each M dwarf spectral type. We also present evidence for a possible decrease in the metallicity as a function of height above the Galactic Plane. In addition to our activity analysis, we provide line measurements, molecular band indices, colors, radial velocities, 3-D space motions and mean properties as a function of spectral type for the SDSS DR5 low-mass star sample. 2008AJ....135..785W https://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/135/785 Catalog Research IsServedBy TAP VizieR generic service IsServedBy Conesearch service related-to II/276 : The SDSS Photometric Catalog, Release 5 (Adelman-McCarthy+, 2007) http://www.sdss.org/ : SDSS Home Page J/AJ/123/3409 : SDSS M, L, and T dwarfs (Hawley+, 2002) J/AJ/128/426 : Subdwarfs in the SDSS (West+, 2004) https://cds.unistra.fr/vizier-org/licences_vizier.html https://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/135/785 https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/135/785 http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/135/785 https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/135/785 https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/135/785 http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/135/785 GET text/xml+votable https://tapvizier.cds.unistra.fr/TAPVizieR/tap Cone search capability for table J/AJ/135/785/stars (Spectroscopic and Photometric parameters for 44084 M and L dwarfs in SDSS DR5) https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/135/785/stars? https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/135/785/stars? http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/135/785/stars? GET text/xml+votable 180.0 50000 true 0.0078339 -0.72451 0.005555555555555556 3/64 78 79 88 147 152 4/262 264 296 297 299 300 302 303 307 309 311 331 332 333 334 339 340 341 343 344 345 356 358 359 360 362 363 365 371 372 373 375 377 378 379 383 389 390 391 399 400 402 405 407 408 409 410 412 413 448 453 455 465 466 467 575 582 586 612 614 617 620 622 661 663 668 669 671 680 687 691 692 693 696 698 702 704 706 707 708 710 712 714 716 718 737 1129 1449 1642 1703 1708 1709 1715 1745 1787 1790 2027 5/138 1041 1042 1043 1044 1045 1046 1052 1060 1061 1088 1167 1178 1179 1181 1182 1183 1192 1193 1195 1205 1206 1207 1222 1223 1224 1225 1227 1232 1233 1234 1240 1242 1243 1302 1303 1305 1307 1310 1311 1319 1321 1322 1323 1340 1341 1344 1349 1351 1352 1354 1355 1368 1369 1370 1384 1385 1386 1390 1392 1395 1396 1397 1398 1401 1403 1404 1406 1428 1430 1431 1445 1446 1447 1456 1458 1464 1465 1466 1468 1470 1471 1472 1475 1476 1478 1479 1480 1481 1483 1496 1497 1498 1504 1507 1521 1522 1523 1525 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Should Not be used for identification. meta.record int Plate SDSS plate meta.note int MJD Modified Julian date of observation d time.epoch int SpT [0/10] Spectral M-type code (1) src.spType int pmRA ? Proper motion along right ascension (2) mas/yr pos.pm;pos.eq.ra float nullable e_pmRA Proper motion along RA error (2) mas/yr stat.error;pos.pm;pos.eq.ra float pmDE ? Proper motion along declination (2) mas/yr pos.pm;pos.eq.dec float nullable e_pmDE Proper motion along DE error (2) mas/yr stat.error;pos.pm;pos.eq.dec float RV Radial velocity (3) km/s spect.dopplerVeloc;pos.heliocentric double Dist Photometric distance (4) pc pos.distance;pos.heliocentric float umag SDSS u-band psf magnitude mag phot.mag;em.opt.U float e_umag SDSS u-band psf magnitude error mag stat.error;phot.mag;em.opt.U float gmag SDSS g-band psf magnitude mag phot.mag;em.opt.B float TiO5 TiO5 bandhead meta.note float e_gmag SDSS g-band psf magnitude error mag stat.error;phot.mag;em.opt.B float rmag SDSS r-band psf magnitude mag phot.mag;em.opt.R float e_rmag SDSS r-band psf magnitude error mag stat.error;phot.mag;em.opt.R float imag SDSS i-band psf magnitude mag phot.mag;em.opt.I float e_imag SDSS i-band psf magnitude error mag stat.error;phot.mag;em.opt.I float zmag SDSS z-band psf magnitude mag phot.mag;em.opt.I float e_zmag SDSS z-band psf magnitude error mag stat.error;phot.mag;em.opt.I float Jmag ? 2MASS J-band psf magnitude mag phot.mag;em.IR.J float nullable e_Jmag ? 2MASS J-band psf magnitude error mag stat.error;phot.mag;em.IR.J float nullable Hmag ? 2MASS H-band psf magnitude mag phot.mag;em.IR.H float nullable e_Hmag ? 2MASS H-band psf magnitude error mag stat.error;phot.mag;em.IR.H float nullable Kmag ? 2MASS K-band psf magnitude mag phot.mag;em.IR.K float nullable e_Kmag ? 2MASS K-band psf magnitude error mag stat.error;phot.mag;em.IR.K float nullable Au u-band Galactic extinction (5) mag phys.absorption float Ag g-band Galactic extinction (5) mag phys.absorption.gal float Ar r-band Galactic extinction (5) mag phys.absorption.gal float Ai i-band Galactic extinction (5) mag phys.absorption.gal float Az z-band Galactic extinction (5) mag phys.absorption float EWHa H{alpha} equivalent width 0.1nm spect.line.eqWidth;em.line.Halpha float e_EWHa H{alpha} equivalent width error 0.1nm stat.error float CaH1 ? CaH1 bandhead meta.note float nullable CaH2 CaH2 bandhead meta.note float CaH3 CaH3 bandhead meta.note float TiO8 ? TiO8 bandhead spect.index float nullable Ac [mnwy] Activity indicator (y=active, n=no, m=marginally, w=weakly) meta.code char zDist Vertical distance from the Galactic plane pc pos.cartesian.z;pos.galactic double UVel U space motion (positive toward Galactic center) km/s phys.veloc;pos.cartesian.x double VVel V space motion km/s phys.veloc;pos.cartesian.y double WVel W space motion km/s phys.veloc;pos.cartesian.z double SNR Signal-to-noise ratio near H{alpha} stat.snr double DR5 Data from SDSS-DR5 meta.ref.url char SDSS Display the SDSS data for this star meta.ref.url char 2M Display the 2MASS data for this star meta.ref.url char RAJ2000 Right ascension (J2000) deg pos.eq.ra;meta.main DEJ2000 Declination (J2000) deg pos.eq.dec;meta.main