J/A+A/640/A40ivo://CDS.VizieR/J/A+A/640/A40doi:10.26093/cds/vizier.36400040CDSHummerich S.Paunzen E.Bernhard K.2022-11-22T11:00:00Z2020-08-10T07:38:56ZCDS support team

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

cds-question@unistra.frap-starspeculiar-variable-starsstellar-spectral-typesmorgan-keenan-classificationstellar-agesstellar-massesThe present work is aimed at identifying new mCP stars using spectra collected by the Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST). Suitable candidates were selected by searching LAMOST DR4 spectra for the presence of the characteristic 5200{AA} flux depression. Spectral classification was carried out with a modified version of the MKCLASS code and the accuracy of the classifications was estimated by comparison with results from manual classification and the literature. Using parallax data and photometry from Gaia DR2, we investigated the space distribution of our sample stars and their properties in the colour-magnitude diagram. Our final sample consists of 1002 mCP stars, most of which are new discoveries (only 59 common entries with the Catalogue of Ap, HgMn and Am stars). Traditional mCP star peculiarities have been identified in all but 36 stars, highlighting the efficiency of the code's peculiarity identification capabilities. The derived temperature and peculiarity types are in agreement with manually derived classifications and the literature. Our sample stars are between 100Myr and 1Gyr old, with the majority having masses between 2M_{sun}_ and 3M_{sun}_. Our results could be considered as strong evidence for an inhomogeneous age distribution among low-mass (M<3M_{sun}_) mCP stars; however, we caution that our sample has not been selected on the basis of an unbiased, direct detection of a magnetic field. We identified several astrophysically interesting objects: the mCP stars LAMOST J122746.05+113635.3 and LAMOST J150331.87+093125.4 have distances and kinematical properties in agreement with halo stars; LAMOST J034306.74+495240.7 is an eclipsing binary system (Porb=5.1435+/-0.0012d) hosting an mCP star component; and LAMOST J050146.85+383500.8 was found to be an SB2 system likely comprising of an mCP star and a supergiant component. With our work, we significantly increase the sample size of known Galactic mCP stars, paving the way for future in-depth statistical studies.2020A&A...640A..40Hhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/640/A40CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toI/345 : Gaia DR2 (Gaia Collaboration, 2018)V/133 : Kepler Input Catalog (Kepler Mission Team, 2009)VII/233 : The 2MASS Extended sources (IPAC/UMass, 2003-2006)V/153 : LAMOST DR4 catalogs (Luo+, 2018)J/AJ/151/13 : LAMOST-Kepler MKCLASS spectral classification (Gray+, 2016)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/640/A40https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/640/A40http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/640/A40https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/640/A40https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/640/A40http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/640/A40GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/640/A40/tablea1 (Essential data for the 1002 mCP stars identified in the present study)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/640/A40/tablea1?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/640/A40/tablea1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/640/A40/tablea1?GETtext/xml+votable180.050000true1.751255.55934440.005555555555555556Cone search capability for table J/A+A/640/A40/tablec1 (*Standard stars of the liblamost library)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/640/A40/tablec1?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/640/A40/tablec1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/640/A40/tablec1?GETtext/xml+votable180.050000true294.635833346.06641670.0055555555555555565/324 333 3698 5892 5985 6/7 96 111 298 350 371 467 508 511 759 799 805 883 976 984 990 1029-1031 1038 1056 1064 1066 1096 1171 1186 1200 1210 1214 1225 1238 1252 1277 1283-1285 1287 1292 1300-1302 1304-1305 1310 1328-1329 1336-1338 1348-1349 1352 1355 1362-1364 1366-1367 1369-1370 1377-1378 1382 1386-1387 1390-1391 1405 1412-1414 1422-1423 1426-1428 1430-1432 1455 1460 1464 1470 1473 1476-1477 1483-1484 1488 1498 1515-1517 1522 1532 1534 1536 1541 1555 1563 1568 1573 1590 1597 1602 1617 1619-1620 1623 1625 1631 1634 1644 1648-1649 1658-1659 1661 1694 1709 1711 1715 1717-1718 1721 1733 1738-1740 1742 1746-1747 1749 1752 1754 1756 1766 1768 1770 1773-1774 1780 1785-1788 1790 1800 1812 1828-1829 1832 1836 1851-1852 1855-1856 1858 1866 1871 1881 1896 1922 1924 1929-1932 1939 1941-1942 1944-1945 1953 1955-1958 1960 1962-1963 1975 1985 1987 1990 1992 2017 2024 2089 2170 2356 2371 2411 2423 2476 2500 2511 2524 2528 2545 2547 2551 2559 2654 2669-2670 2684 2694 2764 2793 2821 2823 2825 2842 2869 2871-2872 2878 2900-2902 2915-2916 2925 2962 2970 2973 2975 2980 2989 2996 3000-3001 3077 3079 3085-3086 3088 3090 3095-3097 3099 3101 3105 3108 3112 3135 3139 3141 3145 3150 3153-3154 3162 3172-3173 3176 3183-3184 3187 3190-3191 3196 3204 3207 3213 3221 3225 3229 3243-3244 3273 3329-3330 3337 3339 3362 3368 3584-3585 3587-3588 4142 4172 4182 4193 4660 4668 4697 4724 4780 4935 4960 4963 5188 5264 5453 5496 5634 6154 6170 6238 6304-6305 6312 6317 6320 6335 6432 6456 6493 6522 6621 6659 6679-6680 6689 6699 6702 6705 6709-6710 6754 6764 6766 6772 6819 6826 6828 6837 6845-6846 6869 6871 6902 6904 6955 6994 7047 7061 7088 7107 7115 7117 7139 8298 9284 9547 9574 9826 10889 11006 12289 12553 13035 13049 13262 13285 13291 13295 13438 13524 13540 13693 13761 13821 13924 13959 13969 13974 13981 14018 14061-14062 14110 14142 14174-14176 14183 14187-14189 14194-14195 14200 14202 14224 14231-14232 14237 14245 14263 14274 14276 14278 14283 14286 14390 14401 14411 14438 14559 14584 14588 14644 14666 14694 14700 14703 14707 14712 14731 14735 14746 14749-14750 14756 14762 14772-14774 14779 14787 14798 14805 14817 14821-14822 14824-14826 14839 14917 14928 14930 14932 14934 14941 14950 14953 14968 14975 15060 15101 15104 15106 15109 15112-15113 15119-15120 15122-15126 15128-15129 15138 15146 15155-15156 15168 15200 15493 18134 18883 18983 19157 19197-19198 19483 19778 20174 20421 21356 21459 21488 21493 21599 21619 21629-21630 21711 21718 21727 21732 21735 21741 21743-21744 21750 21752 21754 21758 21762 21771 21775 21798 21807 21861 21866-21867 21923 21925 21927 21938 21941 21946 22004-22005 22076 22089 22091 22095 22100 22102 22113 22119 22125 22138-22139 22141 22145 22161 22164 22171 22174-22175 22189-22190 22192 22196 22199 22201 22205 22209 22213-22215 22219 22221-22225 22227 22233 22236 22239 22242 22247 22250 22253 22256 22261-22262 22264 22268-22270 22272 22282 22293-22295 22312-22313 22316 22318 22326 22331 22368 22385 22387 22401 22404-22405 22408 22417 22419 22426 22432 22434 22443 22446 22448 22464-22465 22471 22473 22498-22499 22505 22508 22800 22857 22862 22880 22945 23278 23329 23347 23369 23397 23556 23574 23577 23616 23636 23661 23674-23675 23678 23708 23712 23719 23733 23742 23744 23749 23751 23753 23755 23758 23760 23763-23764 23766 23769-23770 23772 23783 23786 23789 23793-23794 23796-23797 23800-23801 23809 23811 23813-23815 23820-23821 23823-23824 23826-23827 23829-23831 23833 23851 23855-23857 23864 23867 23870 23872 23878 23880 23886-23888 23902 23909 23911-23912 23915-23916 23918 23932 23936-23937 23950 23955 23959 23962 23964 23966-23967 23971-23973 23981-23982 23986-23990 23992 23995 23997-23998 24001 24003-24005 24008 24010-24012 24015 24022 24034-24036 24038-24040 24042 24047 24056-24057 24059 24061 24071 24077 24082 24088 24093 24125 24127-24128 24136-24137 24139 24142 24144-24146 24151 24154 24157-24159 24167 24178-24179 24181 24241 24254 24262 24298 24322 24324-24325 24330 24333 24337-24339 24342-24343 24345-24346 24348 24351 24355-24356 24358 24361-24363 24365 24376-24377 24379-24382 24384-24385 24387 24392 24398 24402 24413 24421 24426 24443 24453 24462 24469 24471 24476-24477 24487 24496 24498 24503 24505 24507 24517 24522 24529 24535-24536 24544 24547 24550 24553 24557-24558 24571 26086 26473 27148 27158 27175 27210 27414 27764 28142 31102 31147 31751 31773 31792 31801 31921 31943 32244 32251 32254 32409 32554 32570https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/640/A40?format=asciiOpticaldefaultJ/A+A/640/A40/tablea1Essential data for the 1002 mCP stars identified in the present studyrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintMass/Ageindicates masses and fractional ages in tableb1meta.ref.urlcharSeq[1/1002] Internal identification numbermeta.idintprimaryLAMOSTLAMOST identifier (JHHMMSS.ss+DDMMSS.s)meta.idcharANameAlternative identifier (1)meta.id;meta.maincharRAJ2000Right Ascension (J2000.0) (2)pos.eq.ra;meta.mainDEJ2000Declination (J2000.0) (2)pos.eq.dec;meta.mainSpTypeSpectral type as derived in this study (3)src.spTypecharn_SpType[abc] Note on SpType (4)meta.notecharSimbadSimbad column added by the CDSmeta.ref.urlcharS/NgSloan g band S/N of analysed spectrumstat.snrintGmagG magnitude (GAIA DR2)magphot.mag;em.optfloate_GmagGmag error (GAIA DR2)magstat.error;phot.magfloatPlx? Parallax (GAIA DR2)maspos.parallaxfloatnullablee_Plx? Parallax error (GAIA DR2)masstat.error;pos.parallaxfloatnullable(BP-RP)0? Dereddened BP-RP colour indexmagphot.color.reddFreefloatnullablee_(BP-RP)0? Dereddened BP-RP colour index errormagstat.errorfloatnullableAG? Absorption in G bandmagphot.mag;em.opt.BfloatnullableGMAG0? Intrinsic absolute magnitude in G bandmagphys.magAbsfloatnullablee_GMAG0? Intrinsic absolute magnitude in G band errormagstat.errorfloatnullableJ/A+A/640/A40/tableb1Masses and fractional ages on the main sequence for the 903 stars fulfilling the accuracy criteriatauFractional age on the main sequence (1)%time.age;arith.ratiointe_tauError on tau, lower limit of 1{sigma} error interval%stat.errorintE_tauError on tau, upper limit of 1{sigma} error interval%stat.error;stat.maxintrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeq[1/1001] Internal identification numbermeta.id;meta.mainintMassMass (1)solMassphys.massfloate_MassError on mass, lower limit of 1{sigma} error intervalsolMassstat.error;phys.massfloatE_MassError on Mass, upper limit of 1{sigma} error intervalsolMassstat.error;stat.maxfloatJ/A+A/640/A40/tablec1*Standard stars of the liblamost libraryn_suitabNote on suitability estimate (3)meta.notecharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDspecOriginal LAMOST spectrum FITS file namemeta.id;meta.maincharKICKepler input catalogue identification numbermeta.idint2MASS2MASS identifier (HHMMSSss+DDMMsSSs)meta.idcharSpTypeSpectral type (1)src.spTypecharS/NgSloan g band S/N of spectrum (1)stat.snrintQualQuality flag (1)meta.code.qualcharsuitabSuitable as an MKK standard? (2)meta.codechar_RAPosition from 2MASS name (right ascension part)degpos.eq.ra;meta.main_DEPosition from 2MASS name (declination part)degpos.eq.dec;meta.main