J/MNRAS/490/2219ivo://CDS.VizieR/J/MNRAS/490/2219doi:10.26093/cds/vizier.74902219CDSNorfolk B.J.Casey A.R.Karakas A.I.Miles M.T.Kemp A.J.,Schlaufman K.C.Ness M.Ho A.Y.Q.Lattanzio J.C.Ji A.P.2024-08-20T20:13:40Z2023-03-21T12:52:00ZCDS support team

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

cds-question@unistra.frgiant-starspeculiar-variable-starschemically-peculiar-starsastrometryvisible-astronomytrigonometric-parallaxproper-motionsradial-velocityeffective-temperatureHere we present the discovery of 895 s-process-rich candidates from 454180 giant stars observed by the Large Sky Area Multi-Object Fibre Spectroscopic Telescope (LAMOST) using a data-driven approach. This sample constitutes the largest number of s-process enhanced stars ever discovered. Our sample includes 187 s-process-rich candidates that are enhanced in both barium and strontium, 49 stars with significant barium enhancement only and 659 stars that show only a strontium enhancement. Most of the stars in our sample are in the range of effective temperature and logg typical of red giant branch (RGB) populations, which is consistent with our observational selection bias towards finding RGB stars. We estimate that only a small fraction (~0.5 per cent) of binary configurations are favourable for s-process enriched stars. The majority of our s-process-rich candidates (95 per cent) show strong carbon enhancements, whereas only five candidates (<3 per cent) show evidence of sodium enhancement. Our kinematic analysis reveals that 97 per cent of our sample are disc stars, with the other 3 per cent showing velocities consistent with the Galactic halo. The scaleheight of the disc is estimated to be z_h_=0.634+/-0.063kpc, comparable with values in the literature. A comparison with yields from asymptotic giant branch (AGB) models suggests that the main neutron source responsible for the Ba and Sr enhancements is the ^13^C({alpha},n)^16^O reaction. We conclude that s-process-rich candidates may have received their overabundances via mass transfer from a previous AGB companion with an initial mass in the range 1-3M_{sun}_.2019MNRAS.490.2219Nhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/490/2219CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/ApJ/836/5 : Abundances of LAMOST giants from APOGEE DR12 (Ho+, 2017)I/345 : Gaia DR2 (Gaia Collaboration, 2018)V/149 : LAMOST DR2 catalogs (Luo+, 2016)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/490/2219https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/490/2219http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/490/2219https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/490/2219https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/490/2219http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/490/2219GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/490/2219/table1 (Properties of 895 s-process-rich candidates)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/490/2219/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/490/2219/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/490/2219/table1?GETtext/xml+votable180.050000true355.9168538928.523131940.0055555555555555565/1721 6/56 265 383 434 467 476 523 729 773 853 901 921 960 968 975 986 1007 1032 1067 1079 1110 1122 1152 1181 1185 1187 1193 1201 1206 1210 1213 1225-1226 1228 1250 1256-1258 1279 1286 1299 1311 1317 1330 1346 1364 1371 1376 1383 1389 1393-1395 1400 1402 1425 1442 1444 1452 1457 1476-1477 1479 1488 1490 1509 1518 1522-1523 1526 1532 1537 1541 1551 1554-1555 1562 1569 1572-1573 1578 1587 1595 1600 1617 1622 1627 1630-1631 1648 1650 1657-1658 1661 1671 1677 1680 1688-1689 1691 1707 1717 1719 1734 1739 1741-1743 1747 1761 1769 1777 1858 1864 1868 1876 1878 1882 1904 1914 1942 1946 1948 1950 1952 1972 1989 1994 2004 2007 2019 2329 2362 2395 2398 2403-2405 2408 2410-2412 2415 2421 2423-2426 2484-2485 2502 2505 2508-2509 2528-2529 2551 2564 2569 2598 2606 2615 2617 2619 2622 2626 2630 2633 2642 2647 2652 2663 2667 2670 2677 2688 2692 2695 2699 2712 2714 2720 2722 2726 2730 2732-2733 2752 2754 2795 2798 2820 2824 2969 2992 3075 3079 3083 3085 3087 3097-3098 3105-3106 3109 3111-3112 3118 3129-3131 3134-3135 3177 3188 3207 3213 3228 3267 3331 4112 4118 4128 4132 4150 4159 4232 4264 4404 4459 4525 4608 4732 4734 4761 4766 4773 4775 4780 4782 4799 4803 4872 4880 4882 4884 4886 4909-4910 4931 4939 4971 5017 5058 5065 5085 5104 5113 5166 5224 5238 5240 5244 5255 5321 5358 5364 5407 5654 5734 5804 5819 5908 6147 6170 6177 6185 6196 6208 6210 6238 6242 6264 6266 6275 6280 6283 6290-6291 6298 6304 6306 6321 6338 6344 6352 6354 6357 6360-6361 6363 6376 6378 6381 6391-6392 6405 6470 6492-6493 6515 6608 6675 6683-6684 6686 6689 6691-6692 6699 6704-6705 6707-6709 6723 6734-6735 6750 6752-6753 6755-6756 6758 6761 6764 6766 6768 6772 6780 6782 6784 6786 6839 6845 6869 6880 6882-6883 6888-6889 6896-6897 6926 6936 6944 6947 6952 6978 7022-7023 7035 7039 7070 7089 7093 7099 7109 7114 7119 7123 7148 7150 7152 7219 7224 7277 7684 8214 8237 8239 8345 8418 8464 8590 8612 8616 8689 8692 8757 8765 8801 8864 8903 8907 9070 9110 9157 9189 9250 9257 9268 9446-9447 9474 9481 9495 9501-9502 9637 9642 9685 9980 10459 10522 10550 10715 10732 10884 10986 11085 11356 11365 11430 12590 12604 12606 12611 12638 12752 13437 13482-13483 13529 13531 13533 13540 13553 13629 13675 13693 13695 13707 13718-13719 13725 13748 13760 13779 13782 13791 13884 13973-13975 14586 14757-14758 14763 14774 14818-14820 14824 14886 14937 14947 14970 15038 15047 15059 15084 15107 15111 15122 15169 15301 17614 17670 17871 18000 18041 18103 18247 18814 18877 18997 19149 19163 19221 19246 19267 19288 19348 19450 19476 19593 19697 19804 19809 19822 19880 19920 20019 20023 20030 20141 20172 20179 20276 20301 20370 20447 20453 20457 20477 20479 21356 21369 21434 21444-21445 21466 21620 21750 21753 21759 21762 21770 21774 21786 21790 21796 21798-21800 21805-21806 21808 21810 21816 21820 21822 21892 21901 21906 21908 21911 21919 21954 21961 21966 21990 21996 21999 22001 22012 22015 22056 22097 22101 22234 22245 22257 22268 22285 22298 22300 22326 22338 22384 22387 22392 22397 22399 22438 22446 22473 22493 22498 22506 22999 23004-23005 23030 23375 23416-23417 23421 23672 23682 23690 23694 23701 23708-23709 23712-23713 23715-23716 23725 23771 23781 23792 23809 23814-23815 23819 23821 23828 23831 23837 23859 23882 23885-23886 23899-23900 23902-23903 23912 23915 23918-23920 23923 23927 23929 23932 23955 23959 23975 23989 23992 23999-24002 24004 24010 24013 24018 24021 24024 24026-24028 24051-24052 24055-24057 24065 24144 24177 24179-24180 24188 24248-24249 24270 24296 24324-24325 24331 24333 24335 24340-24341 24348 24357 24369 24374 24377 24379 24382 24385 24390 24418-24419 24426 24443 24447 24465 24492 24525 24531-24532 24536-24538 24549 24562-24563 24568-24570 25843 25855 25922 26060 26107 26149 26159 26178 26252 26280 26317 26378 26405 26452 26585 27045 27140 27186 27189 27299 27323 27331 27384 27436 27487 27656 27787 27809 27878 28034 28108 28127 28150 28384 28432 28438 28515 28520 28529 28571 31050 31402 31497 31533 31595 31664 31888 31930 32271 32389 32403-32404 32477 32528 32534 32553 32570 32575 32642 32667 32670 32676 32689 32691-32692 40894 40915 40923 45034 490931.9867573869263685e-19 3.916500758235022e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/490/2219?format=asciiOpticaldefaultJ/MNRAS/490/2219/table1Properties of 895 s-process-rich candidateschi2ALAL chi-square value (2)stat.fit.chi2doublerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintTeffcEffective temperature from Ho et al. (2017ApJ...836....5H) (1)Kphys.temperature.effectivedoubleloggcSurface gravity from Ho et al. (2017ApJ...836....5H) (1)log(cm.s**-2)phys.gravitydoublee_loggcError on loggc (1)log(cm.s**-2)stat.errordouble[M/H]cMetallicity from Ho et al. (2017ApJ...836....5H) (1)phys.abund.Zdoublee_[M/H]cError on [M/H]c (1)stat.error;phys.abunddouble[a/M]cAbundance of {alpha}-elements relative to overall metallicity from Ho et al. (2017ApJ...836....5H) (1)phys.abunddoublee_[a/M]cError on [a/M]c (1)stat.errordoublechi2cReduced chi-squared from The Cannon (1)stat.fit.chi2doubleRAJ2000Right ascension (J2000)degpos.eq.ra;meta.mainDEJ2000Declination (J2000)degpos.eq.dec;meta.mainS/NSignal to noise ratio of the LAMOST spectrapixel**-1stat.snrfloatcodeindex[1553/449248] Code indexmeta.code;spect.indexintSronly[true /false] Star with only Sr enhancements (645/871 stars)meta.codecharBaSr[true /false] Enhancement in both Ba and Sr (178/871 stars)meta.codechar[Ba/Fe]1Ba/Fe abundance ratio for the 4554{AA} linephys.abunddoublee_[Ba/Fe]1? Error on [Ba/Fe]1stat.error;phys.abunddoublenullableK[Ba/Fe]1Kernel density estimate of [Ba/Fe]1stat.fit.paramdoublee_K[Ba/Fe]1Error on K[Ba/Fe]1stat.error;phys.abunddouble[Ba/Fe]2Ba/Fe abundance ratio for the 4934{AA} linephys.abunddoublee_[Ba/Fe]2? Error on [Ba/Fe]2stat.error;phys.abunddoublenullableK[Ba/Fe]2Kernel density estimate of [Ba/Fe]2stat.fit.paramdoublee_K[Ba/Fe]2Error on K[Ba/Fe]2stat.error;phys.abunddouble[Sr/Fe]1Sr/Fe abundance ratio for the 4077{AA} linephys.abunddoublee_[Sr/Fe]1? Error on [Sr/Fe]1stat.error;phys.abunddoublenullableK[Sr/Fe]1Kernel density estimate of [Sr/Fe]1stat.fit.paramdoublee_K[Sr/Fe]1Error on K[Sr/Fe]1stat.error;phys.abunddouble[Sr/Fe]2Sr/Fe abundance ratio for the 4215{AA} linephys.abunddoublee_[Sr/Fe]2? Error on [Sr/Fe]2stat.error;phys.abunddoublenullableK[Sr/Fe]2Kernel density estimate of [Sr/Fe]2stat.fit.paramdoublee_K[Sr/Fe]2Error on K[Sr/Fe]2stat.error;phys.abunddoubleGaiaDR2Gaia DR2 source identifier (2)meta.id;meta.mainRAgdegRight ascension (ICRS) at Ep=2015.5 (2)degpos.eq.rae_RAgdegError on RAgdeg (2)degstat.error;pos.eq.radoubleDEgdegDeclination (ICRS) at Ep=2015.5 (2)degpos.eq.dece_DEgdegError on DEgdeg (2)degstat.error;pos.eq.decdoubleGLONGalactic longitudedegpos.galactic.lonGLATGalactic latitudedegpos.galactic.latdoubleELONEcliptic longitudedegpos.ecliptic.lonELATEcliptic latitudedegpos.ecliptic.latdoublePlx? Gaia DR2 parallax (2)maspos.parallaxdoublenullablee_Plx? Error on Plx (2)masstat.error;pos.parallaxdoublenullablepmRA? Gaia DR2 proper motion in right ascension (2)mas/yrpos.pm;pos.eq.radoublenullablee_pmRA? Error on pmRA (2)mas/yrstat.error;pos.pm;pos.eq.radoublenullablepmDE? Gaia DR2 proper motion in declination (2)mas/yrpos.pm;pos.eq.decdoublenullablee_pmDE? Error on pmDE (2)mas/yrstat.error;pos.pm;pos.eq.decdoublenullableGmagGaia DR2 G-band magnitude (2)magphot.mag;em.optdoubleBPmagGaia DR2 BP-band magnitude (2)magphot.mag;em.opt.BdoubleRPmagGaia DR2 RP-band magnitude (2)magphot.mag;em.opt.Rdoubleb_AG? Lower bound on AG (2)magphot.magfloatnullableB_AG? Upper bound on AG (2)magphot.magfloatnullableAG? Estimate of extinction in the G band from Apsis-Priam (2)magphys.absorptionfloatnullableepsi? Excess noise of the source (2)masstat.fit.paramfloatnullablesepsi? Significance of excess noise (2)stat.fit.paramdoublenullablegofALGoodness of fit statistic of model wrt along-scan observations (2)stat.fit.goodnessdoubleMatchObsAMatched FOV transits used in the AGIS solution (2)meta.numberintNbALNumber of bad observations AL (2)meta.numberintNgALNumber of good observations AL (2)meta.numberintNACTotal number of observations AC (2)meta.numberintNALTotal number of observations AL (2)meta.numberintSolvedNumber of astrometric parameters solved (2)meta.numberintpscol? Astrometrically determined pseudocolour of the source (2)um**-1stat.fit.paramdoublenullablee_pscol? Error on pscolum**-1stat.errordoublenullableamaxThe longest semi-major axis of the 5-d error ellipsoid (2)masphys.angSize.smajAxisdoubleWALMean astrometric weight of the source (2)mas**-2stat.weightdoubleBP-GBP-G colour index (2)magphot.color;em.opt;em.optdoubleBP-RPBP-RP colour index (2)magphot.color;em.opt;em.optdoubleDEPlxcor? Correlation between declination and parallax (2)stat.correlationnullableDEpmDEcor? Correlation between declination and proper motion in declination (2)stat.correlationnullableDEpmRAcor? Correlation between declination and proper motion in right ascension (2)stat.correlationnullableb_E(BP-RP)? Lower bound on E(BP-RP) (2)magphot.color.excess;stat.minfloatnullableB_E(BP-RP)? Upper bound on E(BP-RP) (2)magphot.color.excess;stat.maxfloatnullableE(BP-RP)? Estimate of redenning E(BP-RP) from Apsis-Priam (2)magphot.color.excessfloatnullableG-RPG-RP colour index (2)magphot.color;em.opt;em.optdoubleb_Lum? Lower bound on Lum (2)log(solLum)phys.luminosity;stat.mindoublenullableB_Lum? Upper bound on Lum (2)log(solLum)phys.luminosity;stat.maxdoublenullableLum? Esimate of luminosity from Apsis-FLAME (2)log(solLum)phys.luminositydoublenullableMatchObsThe total number of FOV transits matched to this source (2)meta.numberintfvarpiMean Parallax factor AL (2)arith.factor;pos.parallaxdoubleRPlx? Parallax divided by its error (2)stat.fit.omcdoublenullablePlxpmDEcor? Correlation between parallax and proper motion in declination (2)stat.correlationdoublenullablePlxpmRAcor? Correlation between parallax and proper motion in right ascension (2)stat.correlationdoublenullableFBPMean flux in the integrated BP band (2)phot.flux.density;em.opt.Bdoublee_FBPError on FBP (2)stat.errordoubleRFBPIntegrated BP mean flux divided by its error (2)stat.fit.omcdoubleo_BPmagNumber of observations contributing to BP photometry (2)meta.numberintE(BP/RP)BP/RP excess factor (2)arith.factordoubleFGG-band mean flux (2)phot.flux.density;em.optdoublee_FGError on FG (2)stat.errordoubleRFGG-band mean flux divided by its error (2)stat.fit.omcdoubleo_GmagNumber of observations contributing to G photometry (2)meta.numberintModePhotometry processing mode (2)meta.codeintFRPMean flux in the integrated RP band (2)phot.flux.density;em.opt.Rdoublee_FRPError on FRP (2)stat.errordoubleRFRPIntegrated RP mean flux divided by its error (2)stat.fit.omcdoublepmRApmDEcor? Correlation between proper motion in right ascension and proper motion in declination (2)stat.correlationdoublenullableRADEcorCorrelation between right ascension and declination (2)stat.correlationRV? Radial velocity (2)km/sphys.veloc;pos.heliocentricdoublenullablee_RV? Error on RV (2)km/sstat.errordoublenullableb_Rad? Lower bound on Rad (2)log(solRad)phys.size.radius;stat.mindoublenullableB_Rad? Upper bound on Rad (2)log(solRad)phys.size.radius;stat.maxdoublenullableRad? Estimate of radius from Apsis-FLAME (2)log(solRad)phys.size.radiusdoublenullableRandomIRandom index used to select subsets (2)meta.idRAPlxcor? Correlation between right ascension and parallax (2)stat.correlationnullableRApmDEcor? Correlation between right ascension and proper motion in declination (2)stat.correlationnullableRApmRAcor? Correlation between right ascension and proper motion in right ascension (2)stat.correlationnullableEpoch[2015.5] Reference epoch (2)yrtime.epochfloato_RVNumber of transits used to compute radial velocity (2)meta.numberint[Fe/H]temp? Fe/H of the template used to compute radial velocity (2)phys.abund.Fefloatnullableloggtemp? logg of the template used to compute radial velocity (2)log(cm.s**-2)phys.gravityfloatnullableTefftemp? Teff of the template used to compute radial velocity (2)Kphys.temperature.effectiveintnullableb_Teff? Lower bound on Teff (2)Kphys.temperature.effective;stat.mindoublenullableB_Teff? Upper bound on Teff (2)Kphys.temperature.effective;stat.maxdoublenullableTeff? Stellar effective temperature (estimate from Apsis-Priam) (2)Kphys.temperature.effectivedoublenullableNperVisibility periods used in astrometric solution (2)meta.numberintUU component of space velocitykm/sphys.veloc;pos.cartesian.xdoubleVV component of space velocitykm/sphys.veloc;pos.cartesian.ydoubleWW component of space velocitykm/sphys.veloc;pos.cartesian.zdoubleX? Galactic position Xkpcpos.distance;pos.cartesian.x;pos.galacticdoublenullableY? Galactic position Ykpcpos.distance;pos.cartesian.y;pos.galacticdoublenullableZ? Galactic position Zkpcpos.distance;pos.cartesian.z;pos.galacticdoublenullableIDspObject spectral identifier from LAMOSTmeta.notechare_TeffcError on Teffc (1)Kstat.errorfloato_RPmagNumber of observations contributing to RP photometry (2)meta.numberintfPriam? Flags for the Apsis-Priam results (2)meta.codeintnullableBaonly[true /false] Star with only Ba enhancements (48/871 stars)meta.codechar