J/AJ/167/125 ABYSS. II. LAMOST pre-main-sequence candidates (Saad+, 2024)
ABYSS.
II. Identification of Young Stars in Optical SDSS Spectra and Their Properties.
Saad S., Lane K., Kounkel M., Stassun K.G., Lopez-Valdivia R., Kim J.S.,
Pena Ramirez K., Stringfellow G.S., Roman-Zuniga C.G., Hernandez J.,
Wolk S.J., Hillenbrand L.A.
<Astron. J., 167, 125 (2024)>
=2024AJ....167..125S 2024AJ....167..125S
ADC_Keywords: YSOs; Spectra, optical; Spectra, infrared; Effective temperatures;
Radial velocities
Keywords: Emission line stars ; Young stellar objects ; Stellar spectral
lines ; Surveys
Abstract:
We developed a tool that measures equivalent widths of various lines
in low-resolution optical spectra, and it was applied to stellar
spectra obtained as part of SDSS-V and LAMOST programs. These lines,
such as LiI, which directly indicates stellar youth, or optical HI and
CaII, which in emission indicate activity associated with stellar
youth, are commonly seen in YSOs. We observe several notable
differences in the properties of these lines between YSOs and the
field stars. Using these data, we devise a set of criteria through
which it is possible to confirm the youth of stars that have been
observed by the ABYSS program, as well as to identify likely young
stars that have serendipitously been observed by other programs. We
examine the decrement of H lines seen in emission in CTTSs, and
estimate the properties of the accretion stream that is responsible
for the production of these lines. Finally, we examine the evolution
of LiI as a function of age, and characterize the scatter in its
abundance that appears to be intrinsic in young M-dwarfs.
Description:
BOSS is a low-resolution optical spectrograph with R∼1800 with a
typical pixel scale of ∼1Å, covering a wavelength range of
3600-10400Å. Twin instruments are mounted at two observatories, at
Apache Point Observatory (APO) and Las Campanas Observatory (LCO), to
ensure a complete coverage of the entire sky.
LAMOST (Large Sky Area Multi-Object Fiber Spectroscopic Telescope) is
a spectrograph very similar to BOSS in terms of its resolution,
although it does have a slightly narrower wavelength range of
3700-9000Å.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 1157 23903 *LAMOST PMS candidates
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Note on table2.dat: Many data from Sizemore, 2024AJ....167..173S 2024AJ....167..173S.
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See also:
III/286 : APOGEE-2 DR17 final allStar catalog (Abdurro'uf+, 2022)
J/AJ/135/785 : SDSS-DR5 low-mass star spectroscopic sample (West+, 2008)
J/ApJS/208/9 : Intrinsic colors & temperatures of PMS stars (Pecaut+, 2013)
J/A+A/563/A94 : Kinematics of the Gamma Vel cluster (Jeffries+, 2014)
J/ApJ/834/85 : Hα emission in nearby M dwarfs (Newton+, 2017)
J/AJ/154/14 : Low-mass stars in 25 Ori group & Orion OB1a (Suarez+, 2017)
J/AJ/157/85 : CIDA Variability Survey of Orion OB1. II. (Briceno+, 2019)
J/MNRAS/484/4591 : The GALAH Survey lithium-strong KM dwarfs (Zerjal+, 2019)
J/ApJ/904/146 : Young stars in North America & Pelican Nebulae (Fang+, 2020)
J/A+A/643/A71 : Members for 20 open clusters (Gutierrez Albarran+, 2020)
J/AJ/159/182 : APOGEE Net, YSOs params through deep learning (Olney+, 2020)
J/A+A/643/A29 : Z CMa NW emission lines (Sicilia-Aguilar+, 2020)
J/ApJ/908/49 : 361 Hertzsprung-Russell diagram in Orion (Fang+, 2021)
J/ApJS/254/20 : Stellar groups in Taurus field Gaia DR2 &LAMOST (Liu+, 2021)
J/AJ/162/282 : Untangling Galaxy. III. Pre-main-sequence (Mcbride+, 2021)
J/AJ/164/137 : Untangling the Galaxy IV ∼100000 stars TESS (Kounkel+, 2022)
J/AJ/163/152 : Stellar parameters for ∼650000 stars APOGEE (Sprague+, 2022)
Byte-by-byte Description of file: table2.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
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1- 9 I9 --- LAMOST LAMOST unique identifier (ObsID)
11- 20 F10.6 deg RAdeg [0/360] Right Ascention (J2000)
22- 30 F9.6 deg DEdeg [-10/89] Declination (J2000)
32- 38 F7.5 [K] [Teff] [3.46/4.58] Effective temperature from
Sizemore et al.
40- 45 A6 [K] e_[Teff] ? Uncertainty in logTeff
47- 52 F6.4 [cm/s2] logg [2.32/5.33] Surface gravity from
Sizemore et al.
54- 59 F6.4 [cm/s2] e_logg [0.002/2]? Uncertainty in logg
61- 68 F8.3 km/s RVel [-380/477] Radial velocity from
Sizemore et al.
70- 75 F6.3 km/s e_RVel [0.08/90]? Uncertainty in RVel
77- 81 F5.3 --- PMS [0.1/1] Probability from spectroscopic
classifier (1)
83- 90 F8.5 10-10m LiI-EQW [-6.1/3.66]? Equivalent width of LiI
92- 97 A6 10-10m e_LiI-EQW ? Uncertainty in LiI-EQW
99- 104 F6.3 10-10m LiI-ABW [2.5/39.2]? Absolute width of LiI
106- 111 F6.3 10-10m e_LiI-ABW [0.035/12.0]? Uncertainty in LiI-ABW
113- 120 F8.3 10-10m Halpha-EQW [-117.0/20.0]? Equivalent width of Halpha
122- 127 F6.3 10-10m e_Halpha-EQW [0.013/26.0]? Uncertainty in Halpha-EQW
129- 135 F7.3 10-10m Halpha-ABW [4.5/175.0]? Absolute width of Halpha
137- 142 F6.3 10-10m e_Halpha-ABW [0.023/41.0]? Uncertainty in Halpha-ABW
144- 150 F7.3 10-10m Hbeta-EQW [-73.7/23.5]? Equivalent width of Hbeta
152- 157 F6.3 10-10m e_Hbeta-EQW [0.016/30.0]? Uncertainty in Hbeta-EQW
159- 164 F6.2 10-10m Hbeta-ABW [4.3/157.0]? Absolute width of Hbeta
166- 171 F6.3 10-10m e_Hbeta-ABW [0.094/37.0]? Uncertainty in Hbeta-ABW
173- 179 F7.3 10-10m Hgamma-EQW [-95.1/24.5]? Equivalent width of Hgamma
181- 186 F6.3 10-10m e_Hgamma-EQW [0.014/31.0]? Uncertainty in Hgamma-EQW
188- 194 F7.3 10-10m Hgamma-ABW [3.4/157.0]? Absolute width of Hgamma
196- 201 F6.3 10-10m e_Hgamma-ABW [0.078/27.0]? Uncertainty in Hgamma-ABW
203- 210 F8.3 10-10m Hdelta-EQW [-105.0/27.5]? Equivalent width of Hdelta
212- 217 F6.3 10-10m e_Hdelta-EQW [0.016/35.0]? Uncertainty in Hdelta-EQW
219- 224 F6.2 10-10m Hdelta-ABW [3.0/157.0]? Absolute width of Hdelta
226- 230 F5.2 10-10m e_Hdelta-ABW [0.12/37.0]? Uncertainty in Hdelta-ABW
232- 239 F8.3 10-10m Hepsilon-EQW [-101.1/35.75]? Equivalent width of
Hepsilon
241- 246 F6.3 10-10m e_Hepsilon-EQW [0.02/35.0]? Uncertainty in Hepsilon-EQW
248- 253 F6.2 10-10m Hepsilon-ABW [3.5/126.0]? Absolute width of Hepsilon
255- 259 F5.2 10-10m e_Hepsilon-ABW [0.12/27.0]? Uncertainty in Hepsilon-ABW
261- 267 F7.3 10-10m Pa11-EQW [-20.6/18.0]? Equivalent width of Pa11
269- 274 F6.3 10-10m e_Pa11-EQW [0.013/14.0]? Uncertainty in Pa11-EQW
276- 281 F6.2 10-10m Pa11-ABW [4.53/201.9]? Absolute width of Pa11
283- 287 F5.2 10-10m e_Pa11-ABW [0.18/42.0]? Uncertainty in Pa11-ABW
289- 296 F8.4 10-10m Pa12-EQW [-26.6/18.8]? Equivalent width of Pa12
298- 303 F6.3 10-10m e_Pa12-EQW [0.01/20.0]? Uncertainty in Pa12-EQW
305- 310 F6.2 10-10m Pa12-ABW [4.83/111.0]? Absolute width of Pa12
312- 316 F5.2 10-10m e_Pa12-ABW [0.18/44.0]? Uncertainty in Pa12-ABW
318- 324 F7.3 10-10m Pa13-EQW [-19.75/18.0]? Equivalent width of Pa13
326- 331 F6.3 10-10m e_Pa13-EQW [0.018/17.0]? Uncertainty in Pa13-EQW
333- 337 F5.2 10-10m Pa13-ABW [4.9/81.9]? Absolute width of Pa13
339- 344 F6.3 10-10m e_Pa13-ABW [0.098/18.0]? Uncertainty in Pa13-ABW
346- 353 F8.4 10-10m Pa14-EQW [-17.2/15.0]? Equivalent width of Pa14
355- 361 F7.4 10-10m e_Pa14-EQW [0.0036/26.0]? Uncertainty in Pa14-EQW
363- 368 F6.3 10-10m Pa14-ABW [5.1/68.4]? Absolute width of Pa14
370- 375 F6.3 10-10m e_Pa14-ABW [0.082/16.0]? Uncertainty in Pa14-ABW
377- 383 F7.3 10-10m Pa15-EQW [-32.0/12.7]? Equivalent width of Pa15
385- 390 F6.3 10-10m e_Pa15-EQW [0.016/18.0]? Uncertainty in Pa15-EQW
392- 397 F6.2 10-10m Pa15-ABW [4.57/101.0]? Absolute width of Pa15
399- 403 F5.2 10-10m e_Pa15-ABW [0.16/43.0]? Uncertainty in Pa15-ABW
405- 411 F7.3 10-10m Pa16-EQW [-44.6/16.0]? Equivalent width of Pa16
413- 418 F6.3 10-10m e_Pa16-EQW [0.011/27.0]? Uncertainty in Pa16-EQW
420- 426 F7.3 10-10m Pa16-ABW [3.3/163.0]? Absolute width of Pa16
428- 432 F5.2 10-10m e_Pa16-ABW [0.07/37.0]? Uncertainty in Pa16-ABW
434- 440 F7.3 10-10m Pa17-EQW [-27.5/36.8]? Equivalent width of Pa17
442- 447 F6.3 10-10m e_Pa17-EQW [0.012/32.0]? Uncertainty in Pa17-EQW
449- 455 F7.3 10-10m Pa17-ABW [5.4/476.0]? Absolute width of Pa17
457- 462 F6.3 10-10m e_Pa17-ABW [0.039/41.0]? Uncertainty in Pa17-ABW
464- 471 F8.4 10-10m CaII8662-EQW [-23.7/10.0]? Equivalent width CaII8662
473- 478 F6.4 10-10m e_CaII8662-EQW [0.0047/6.1]? Uncertainty in CaII8662-EQW
480- 485 F6.3 10-10m CaII8662-ABW [3.2/92.7]? Absolute width of CaII8662
487- 491 F5.2 10-10m e_CaII8662-ABW [0.07/22.0]? Uncertainty in CaII8662-ABW
493- 500 F8.4 10-10m CaII8542-EQW [-21.5/6.7]? Equivalent width CaII8542
502- 507 F6.4 10-10m e_CaII8542-EQW [0.0018/5.2]? Uncertainty in CaII8542-EQW
509- 514 F6.3 10-10m CaII8542-ABW [3.41/67.0]? Absolute width of CaII8542
516- 520 F5.2 10-10m e_CaII8542-ABW [0.08/17.0]? Uncertainty in CaII8542-ABW
522- 529 F8.4 10-10m CaII8498-EQW [-21.8/5.9]? Equivalent width CaII8498
531- 536 F6.4 10-10m e_CaII8498-EQW [0.0012/4.7]? Uncertainty in CaII8498-EQW
538- 543 F6.3 10-10m CaII8498-ABW [2.98/55.9]? Absolute width of CaII8498
545- 550 F6.3 10-10m e_CaII8498-ABW [0.066/14.0]? Uncertainty in CaII8498-ABW
552- 560 F9.4 10-10m CaK3933-EQW [-120.0/32.8]? Equivalent width CaK3933
562- 568 F7.4 10-10m e_CaK3933-EQW [0.0039/34.0]? Uncertainty in CaK3933-EQW
570- 575 F6.3 10-10m CaK3933-ABW [3.4/60.5]? Absolute width of CaK3933
577- 582 F6.3 10-10m e_CaK3933-ABW [0.027/18.0]? Uncertainty in CaK3933-ABW
584- 591 F8.3 10-10m CaH3968-EQW [-108.2/35.6]? Equivalent width CaH3968
593- 598 F6.3 10-10m e_CaH3968-EQW [0.02/38.0]? Uncertainty in CaH3968-EQW
600- 605 F6.2 10-10m CaH3968-ABW [3.0/102.0]? Absolute width of CaH3968
607- 611 F5.2 10-10m e_CaH3968-ABW [0.11/46.0]? Uncertainty in CaH3968-ABW
613- 620 F8.4 10-10m HeI6678-EQW [-13.7/2.93]? Equivalent width HeI6678
622- 627 F6.4 10-10m e_HeI6678-EQW [0.0012/6.3]? Uncertainty in HeI6678-EQW
629- 633 F5.2 10-10m HeI6678-ABW [2.88/25.5]? Absolute width of HeI6678
635- 638 F4.2 10-10m e_HeI6678-ABW [0.11/6.9]? Uncertainty in HeI6678-ABW
640- 647 F8.4 10-10m HeI5875-EQW [-15.3/4.785]? Equivalent width HeI5875
649- 654 F6.4 10-10m e_HeI5875-EQW [0.0015/6.9]? Uncertainty in HeI5875-EQW
656- 660 F5.2 10-10m HeI5875-ABW [2.83/26.3]? Absolute width of HeI5875
662- 666 F5.3 10-10m e_HeI5875-ABW [0.086/6.5]? Uncertainty in HeI5875-ABW
668- 674 F7.4 10-10m HeI5015-EQW [-6.6/4.64]? Equivalent width of HeI5015
676- 681 F6.4 10-10m e_HeI5015-EQW [0.0027/2.8]? Uncertainty in HeI5015-EQW
683- 688 F6.3 10-10m HeI5015-ABW [2.9/33.3]? Absolute width of HeI5015
690- 694 F5.3 10-10m e_HeI5015-ABW [0.053/6.6]? Uncertainty in HeI5015-ABW
696- 702 F7.4 10-10m HeI4471-EQW [-9.79/5.89]? Equivalent width HeI4471
704- 709 F6.4 10-10m e_HeI4471-EQW [0.0037/3.1]? Uncertainty in HeI4471-EQW
711- 716 F6.3 10-10m HeI4471-ABW [2.56/48.3]? Absolute width of HeI4471
718- 723 F6.3 10-10m e_HeI4471-ABW [0.082/12.0]? Uncertainty in HeI4471-ABW
725- 731 F7.4 10-10m HeII4685-EQW [-6.05/4.73]? Equivalent width HeII4685
733- 738 F6.4 10-10m e_HeII4685-EQW [0.0023/3.6]? Uncertainty in HeII4685-EQW
740- 745 F6.3 10-10m HeII4685-ABW [2.91/44.9]? Absolute width of HeII4685
747- 750 F4.2 10-10m e_HeII4685-ABW [0.1/6.1]? Uncertainty in HeII4685-ABW
752- 759 F8.4 10-10m NII6583-EQW [-15.8/6.18]? Equivalent width NII6583
761- 766 F6.4 10-10m e_NII6583-EQW [0.0011/4.3]? Uncertainty in NII6583-EQW
768- 773 F6.3 10-10m NII6583-ABW [2.5/56.8]? Absolute width of NII6583
775- 779 F5.3 10-10m e_NII6583-ABW [0.064/8.0]? Uncertainty in NII6583-ABW
781- 788 F8.5 10-10m NII6548-EQW [-9.5/4.14]? Equivalent width of NII6548
790- 795 A6 10-10m e_NII6548-EQW ? Uncertainty in NII6548-EQW
797- 802 F6.3 10-10m NII6548-ABW [2.63/22.9]? Absolute width of NII6548
804- 808 F5.3 10-10m e_NII6548-ABW [0.025/6.4]? Uncertainty in NII6548-ABW
810- 817 F8.4 10-10m SII6716-EQW [-17.4/4.54]? Equivalent width SII6716
819- 824 F6.4 10-10m e_SII6716-EQW [0.0012/5.2]? Uncertainty in SII6716-EQW
826- 831 F6.3 10-10m SII6716-ABW [2.21/29.6]? Absolute width of SII6716
833- 837 F5.3 10-10m e_SII6716-ABW [0.051/9.6]? Uncertainty in SII6716-ABW
839- 845 F7.4 10-10m SII6730-EQW [-7.2/4.42]? Equivalent width of SII6730
847- 852 A6 10-10m e_SII6730-EQW ? Uncertainty in SII6730-EQW
854- 859 F6.3 10-10m SII6730-ABW [2.8/22.7]? Absolute width of SII6730
861- 865 F5.3 10-10m e_SII6730-ABW [0.053/4.2]? Uncertainty in SII6730-ABW
867- 874 F8.4 10-10m FeII5018-EQW [-14.88/4.1]? Equivalent width FeII5018
876- 881 F6.4 10-10m e_FeII5018-EQW [0.0032/3.2]? Uncertainty in FeII5018-EQW
883- 888 F6.3 10-10m FeII5018-ABW [2.49/30.6]? Absolute width of FeII5018
890- 894 F5.3 10-10m e_FeII5018-ABW [0.059/8.5]? Uncertainty in FeII5018-ABW
896- 903 F8.4 10-10m FeII5169-EQW [-17.4/6.6]? Equivalent width FeII5169
905- 910 A6 10-10m e_FeII5169-EQW ? Uncertainty in FeII5169-EQW
912- 917 F6.3 10-10m FeII5169-ABW [3.07/27.6]? Absolute width of FeII5169
919- 923 F5.3 10-10m e_FeII5169-ABW [0.066/9.0]? Uncertainty in FeII5169-ABW
925- 933 F9.5 10-10m FeII5197-EQW [-10.53/4.06]? Equivalent width FeII5197
935- 940 A6 10-10m e_FeII5197-EQW ? Uncertainty in FeII5197-EQW
942- 947 F6.3 10-10m FeII5197-ABW [2.6/21.0]? Absolute width of FeII5197
949- 953 F5.3 10-10m e_FeII5197-ABW [0.062/5.7]? Uncertainty in FeII5197-ABW
955- 962 F8.5 10-10m FeII6432-EQW [-6.3/5.02]? Equivalent width FeII6432
964- 969 A6 10-10m e_FeII6432-EQW ? Uncertainty in FeII6432-EQW
971- 976 F6.3 10-10m FeII6432-ABW [2.89/29.7]? Absolute width of FeII6432
978- 982 F5.3 10-10m e_FeII6432-ABW [0.045/7.0]? Uncertainty in FeII6432-ABW
984- 991 F8.4 10-10m OI5577-EQW [-12.2/5.11]? Equivalent width of OI5577
993- 998 F6.4 10-10m e_OI5577-EQW [0.0012/7.8]? Uncertainty in OI5577-EQW
1000-1005 F6.3 10-10m OI5577-ABW [1.9/33.6]? Absolute width of OI5577
1007-1011 F5.3 10-10m e_OI5577-ABW [0.064/9.9]? Uncertainty in OI5577-ABW
1013-1020 F8.4 10-10m OI6300-EQW [-26.4/6.89]? Equivalent width of OI6300
1022-1027 A6 10-10m e_OI6300-EQW ? Uncertainty in OI6300-EQW
1029-1034 F6.3 10-10m OI6300-ABW [2.12/34.7]? Absolute width of OI6300
1036-1040 F5.3 10-10m e_OI6300-ABW [0.07/7.8]? Uncertainty in OI6300-ABW
1042-1050 F9.5 10-10m OI6363-EQW [-17.0/6.26]? Equivalent width of OI6363
1052-1057 A6 10-10m e_OI6363-EQW ? Uncertainty in OI6363-EQW
1059-1064 F6.3 10-10m OI6363-ABW [2.61/27.7]? Absolute width of OI6363
1066-1070 F5.3 10-10m e_OI6363-ABW [0.039/7.1]? Uncertainty in OI6363-ABW
1072-1079 F8.4 10-10m OIII5006-EQW [-30.7/8.2]? Equivalent width OIII5006
1081-1086 F6.4 10-10m e_OIII5006-EQW [0.0011/9.0]? Uncertainty in OIII5006-EQW
1088-1093 F6.3 10-10m OIII5006-ABW [2.85/48.3]? Absolute width of OIII5006
1095-1100 F6.3 10-10m e_OIII5006-ABW [0.043/14.0]? Uncertainty in OIII5006-ABW
1102-1109 F8.4 10-10m OIII4959-EQW [-17.5/7.4]? Equivalent width OIII4959
1111-1116 F6.4 10-10m e_OIII4959-EQW [0.002/6.7]? Uncertainty in OIII4959-EQW
1118-1122 F5.2 10-10m OIII4959-ABW [3.25/55.8]? Absolute width of OIII4959
1124-1128 F5.2 10-10m e_OIII4959-ABW [0.11/12.0]? Uncertainty in OIII4959-ABW
1130-1137 F8.4 10-10m OIII4363-EQW [-17.62/6.25]? Equivalent width OIII4363
1139-1144 F6.4 10-10m e_OIII4363-EQW [0.0023/2.7]? Uncertainty in OIII4363-EQW
1146-1151 F6.3 10-10m OIII4363-ABW [2.82/46.1]? Absolute width of OIII4363
1153-1157 F5.3 10-10m e_OIII4363-ABW [0.062/7.3]? Uncertainty in OIII4363-ABW
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Note (1): Of the object being a PMS candidate, reported for PMS>0.1.
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History:
From electronic version of the journal
References:
Kounkel et al. Paper I : 2023ApJS..266...10K 2023ApJS..266...10K
(End) Prepared by [AAS], Coralie Fix [CDS], 17-May-2024