RVs from LAMOST MRS DR7 stellar spectra J/ApJS/256/14 ivo://CDS.VizieR/J/ApJS/256/14 doi:10.26093/cds/vizier.22560014 CDS Zhang Bo Li J. Yang F. Xiong J.-P. Fu J.-N. Liu C. Tian H.,Li Y.-B. Wang J.-X. Liang C.-X. Zhou Y.-T. Zong W. Yang C.-Q.,Liu N. Hou Y.-H. 2025-02-05T20:14:31Z 2023-09-13T14:50:04Z CDS support team CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France cds-question@unistra.fr radial-velocity visible-astronomy spectroscopy surveys standard-stars Radial velocity (RV) is among the most fundamental physical quantities obtainable from stellar spectra and is rather important in the analysis of time-domain phenomena. LAMOST Medium-Resolution Survey (MRS) DR7 contains five million single-exposure stellar spectra with spectral resolution R~7500. However, the temporal variation of the RV zero-points (RVZPs) of the MRS, which makes the RVs from multiple epochs inconsistent, has not been addressed. In this paper, we measure the RVs of 3.8 million single-exposure spectra (for 0.6 million stars) with signal-to-noise ratios (S/N) higher than 5 based on the cross-correlation function method, and propose a robust method to self-consistently determine the RVZPs exposure by exposure for each spectrograph with the help of Gaia DR2 RVs. Such RVZPs are estimated for 3.6 million RVs and can reach a mean precision of ~0.38km/s. The result of the temporal variation of RVZPs indicates that our algorithm is efficient and necessary before we use the absolute RVs to perform time-domain analyses. Validating the results with APOGEE DR16 shows that our absolute RVs can reach an overall precision of 0.84/0.80km/s in the blue/red arm at 50<S/N<100 and of 1.26/1.99km/s at 5<S/N<10. The cumulative distribution function of the standard deviations of multiple RVs (N_obs_>=8) for 678 standard stars reaches 0.45/0.54, 1.07/1.39, and 1.45/1.86km/s in the blue/red arm at the 50%, 90%, and 95% levels, respectively. 2021ApJS..256...14Z https://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJS/256/14 Catalog Research IsServedBy TAP VizieR generic service IsServedBy Conesearch service related-to VI/39 : Model Atmospheres (Kurucz, 1979) I/345 : Gaia DR2 (Gaia Collaboration, 2018) V/156 : LAMOST DR7 catalogs (Luo+, 2019) III/284 : APOGEE-2 data from DR16 (Johnsson+, 2020) J/AJ/137/4377 : List of SEGUE plate pairs (Yanny+, 2009) J/AJ/156/90 : APOGEE radial velocity standard stars (Huang+, 2018) J/ApJS/244/27 : Radial velocity measurements in LAMOST-II (Wang+, 2019) J/ApJ/886/154 : Sgr stream K- & M-giants and BHB stars (Yang+, 2019) J/ApJS/249/31 : Short period sp. & EBs from LAMOST & PTF (Yang+, 2020) J/ApJS/246/9 : Stellar parameters of LAMOST stars using SLAM (Zhang+, 2020) J/ApJS/251/15 : LAMOST-Kepler/K2 survey (LK-MRS) 1st year obs. (Zong+, 2020) J/MNRAS/506/150 : The GALAH+ Survey DR3 (Buder+, 2021) http://github.com/hypergravity/paperdata : Associated data to this paper https://cds.unistra.fr/vizier-org/licences_vizier.html https://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJS/256/14 https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJS/256/14 http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJS/256/14 https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJS/256/14 https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJS/256/14 http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJS/256/14 GET text/xml+votable https://tapvizier.cds.unistra.fr/TAPVizieR/tap Cone search capability for table J/ApJS/256/14/table6 (Selected candidates of RV standard stars from LAMOST MRS DR7 (v1.1)) https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/256/14/table6? https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/256/14/table6? http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/256/14/table6? GET text/xml+votable 180.0 50000 true 15.367275 4.009401 0.005555555555555556 Cone search capability for table J/ApJS/256/14/table4 (The 3.8 million RVs (v_obs_) obtained from LAMOST MRS DR7 (v1.1)) https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/256/14/table4? https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/256/14/table4? http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/256/14/table4? 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22304 22306 22331 22334-22335 22352-22353 22355 22361 22364-22365 22367 22375 22381 22383 22440 22442-22443 22448-22449 22464 22466-22467 22469 22496-22498 22516-22517 22803 22806-22807 22809-22811 22841 22844-22845 22856 22858-22859 22868 22870-22871 22884-22885 22887-22889 23105-23107 23122 23148-23149 23160 23418-23419 23422-23423 23458-23459 23462-23465 23467 23474 23485 23487 23499 23521-23523 23540-23542 23569 23572-23573 23616-23617 23619 23661-23663 23676 23678-23679 23725 23727 23729 23731 23747 23788-23789 23796 23800 23859 23865 23867 23910 23916 23918-23919 23930 23939 23945 23947 23969 23981-23983 24069-24071 24101 24106-24107 24116-24118 24128-24130 24136 24219 24222-24223 24228-24230 24262-24263 24265-24267 24304-24305 24308-24309 24311 24321 24323 24329 24356-24357 24363 24365-24367 24416-24418 24420-24421 24429-24431 24433 24436-24437 24449-24451 24476-24478 24512-24514 24540-24542 24552 24554 24567 24573 24575 25701 25703 25716 25718-25719 25796-25797 25799 25817 25820 25822-25823 25853 25896 25898 25984 25986-25987 25990-25991 26056 26058 26172 26174-26175 26189 26191 26193 26195 26236-26237 26285 26308 26310 26340 26344 26388 26390 26491 26494-26495 26595 26598-26599 26608-26610 26973 26975 26977 26979 27029-27031 27037 27039 27104-27105 27116-27117 27119 27142-27143 27145 27147 27154-27155 27164 27166 27169 27171 27180-27181 27188 27190 27192-27193 27196 27239 27241-27243 27285 27287 27293 27352-27354 27356 27361 27364-27365 27405 27407 27412 27414-27415 27426 27429 27432 27434 27449 27451 27457-27460 27462-27463 27474 27486 27508 27510 27516 27518 27520 27522 27540-27541 27581-27583 27596-27597 27604 27606 27608-27609 27622-27623 27634-27635 27638 27649-27651 27664 27666-27667 27775 27784-27785 27788 27893 27946-27947 27950 27977 27980-27981 27992 28021-28023 28025 28027 28064-28065 28068-28069 28079 28083 28086-28087 28115 28133-28135 28375 28381 28383 28405 28421 28423 28440-28441 28443 28459 28462 28512-28513 28516-28517 28537 28540 28543 28560 28562 28568 28570 28575 28580-28582 28592 28597-28599 28604-28605 28607 28634 28656 28658 28660-28661 30022-30023 30034-30035 30038 30064-30065 30068 30209-30211 30226 30252-30253 30264 30837 30839 30845 30847 30933 31012 31014-31015 31032 31034 31095 31101 31103 31120 31122 31272 31274-31275 31368-31370 31398-31399 31401 31403 31410-31411 31420 31422 31681-31683 31698-31699 31712-31713 31715 31724-31725 31736 31794 31888-31890 31927 31970-31971 31974 32177 32179 32250 32285 32328-32329 32332-32333 32351 32373-32375 32413 32415 32437 32439 32450-32451 32454-32455 32468-32469 32471 32488-32489 32492-32493 32529 32531 32536 32538 32541 32568 32570 32600-32602 32609 32612-32613 32644-32646 32648 32650-32651 32671 32680-32682 32687 32691 32714-32715 32718 32748-32750 45016-45017 45019 49142-49143 https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJS/256/14?format=ascii Optical default J/ApJS/256/14/table6 Selected candidates of RV standard stars from LAMOST MRS DR7 (v1.1) tsR [238.3/624.3] Time span, red arm (ts_R) d time.interval double Nrv Number of RV measurements for this star (link to Table 4) meta.ref.url int nullable DEJ2000 [0.5/60.5] Declination (J2000) (dec) deg pos.eq.dec;meta.main indexed recno Record number assigned by the VizieR team. Should Not be used for identification. meta.record int RAJ2000 Right ascension (J2000) (ra) deg pos.eq.ra;meta.main indexed RVmedB [-287/362] Median absolute RV, blue arm (rvmed_B) km/s spect.dopplerVeloc;stat.median double e_RVmedB [0.04/1.6] Standard deviation of absolute RVs, blue arm (rvstd_B) km/s stat.error float NexpB [8/77] Number of exposures, blue arm (Nexp_B) meta.number int tsB [238.3/624.3] Time span, blue arm (ts_B) d time.interval double RVmedR [-289/361] Median absolute RV, red arm (rvmed_R) km/s spect.dopplerVeloc;stat.median double e_RVmedR [0.05/2] Standard deviation of absolute RVs, red arm (rvstd_R) km/s stat.error float NexpR [8/78] Number of exposures, red arm (Nexp_R) meta.number int
J/ApJS/256/14/table4 The 3.8 million RVs (v_obs_) obtained from LAMOST MRS DR7 (v1.1) planid Plan ID obs.field char recno Record number assigned by the VizieR team. Should Not be used for identification. meta.record int obsID [588902003/747816250] LAMOST observational ID meta.id;obs long indexed LMJM [83555758/84454742] Local Modified Julian Date of the beginning of exposure x1440 (G1) min time.epoch int BJDmid [/2.45865e+06]? Barycentric Julian date of the middle of exposure d time.epoch double nullable indexed spid [1/16] Spectrograph ID meta.id;instr int fiberid [1/250] Fiber ID meta.id;meta.main int RAJ2000 Right ascension (J2000) deg pos.eq.ra;meta.main indexed DEJ2000 [-10/79.1] Declination (J2000) deg pos.eq.dec;meta.main indexed snrB [0/1e+20] S/N of blue arm (snr_B) stat.snr double snrR [0/1e+20] S/N of red arm (snr_R) stat.snr double lampB Lamp used to calibrate blue arm (lamp_B) instr.setup char lampR Lamp used to calibrate red arm (lamp_R) instr.setup char rvB [-2785/3784]? Radial Velocity (v_obs_), blue arm (rv_B) km/s phys.veloc;pos.heliocentric double nullable e_rvB [0/1065]? rvB uncertainty (rv_err_B) km/s stat.error double nullable TeffB [3603/14796]? Effective temperature of the best template, blue arm (rv_teff_B) K phys.temperature.effective;meta.modelled double nullable ccfmaxB [0.039/0.97]? CCF maximum value, blue arm (ccfmax_B) stat.correlation;stat.max float nullable rvR [-3354/3309]? Radial Velocity (v_obs_), red arm (rv_R) km/s phys.veloc;pos.heliocentric double nullable e_rvR [0/867]? RVR uncertainty (rv_err_R) km/s stat.error float nullable TeffR [3603/14796]? Effective temperature of the best template, red arm (rv_teff_R) K phys.temperature.effective;meta.modelled double nullable ccfmaxR [0.036/1]? CCF maximum value, red arm (ccfmax_R) stat.correlation;stat.max float nullable rvRm [-4101/4043]? Radial Velocity (v_obs_), red arm without H{alpha} (rv_Rm) km/s phys.veloc;pos.heliocentric double nullable e_rvRm [0/1765]? rvRm uncertainty (rv_err_Rm) km/s stat.error double nullable TeffRm [3603/14796]? Effective temperature of the best template, red arm without H{alpha} (rv_teff_Rm) K phys.temperature.effective;meta.modelled double nullable ccfmaxRm [0.039/0.94]? CCF maximum value, red arm without H{alpha} (ccfmax_Rm) stat.correlation;stat.max float nullable Corr Display the RVZP correction values (link to Table 5) meta.ref.url char
J/ApJS/256/14/table5 The RVZP correction values ({Delta}v) for LAMOST MRS DR7 (v1.1) recno Record number assigned by the VizieR team. Should Not be used for identification. meta.record int planid Plan ID obs.field char LMJM [83555758/84454742] Local Modified Julian Date of the beginning of exposure x1440 (G1) min time.epoch int RVcor0B [-294/567]? Initial guess of RVZP correction, blue arm (rv_corr0_B) km/s phys.veloc;arith.diff double nullable NsB [0/213] Number of stars in this SEU with Gaia DR2 RVs, blue arm (nStar_fnt_B) meta.number int RVcor2B [-13.2/15.6]? Final RVZP correction ({Delta}v), blue arm (rv_corr2_B) km/s phys.veloc;arith.diff double nullable NF1B [0/132] Number of stars for first term of cost function, blue arm (nF1_B) meta.number int NF2B [0/210] Number of stars for second term of cost function, blue arm (nF2_B) meta.number int NexpB [0/63] Median number of exposures, blue arm (nOther_med_B) meta.number int B_NexpB [0/76] Maximum number of exposures, blue arm (nOther_max_B) meta.number int b_NexpB [0/63] Minimum number of exposures, blue arm (nOther_min_B) meta.number int e_RVcor2B [0.1/3.1]? Uncertainty of the final RVZP correction ({sigma}{Delta}v), blue arm (rv_corr2_unc_B) km/s stat.error double nullable RVcor0R [-882/945]? Initial guess of RVZP correction, red arm (rv_corr0_R) km/s phys.veloc;arith.diff double nullable NsR [0/214] Number of stars in this SEU with Gaia DR2 RVs, red arm (nStar_fnt_R) meta.number int RVcor2R [-8.2/15]? Final RVZP correction ({Delta}v), red arm (rv_corr2_R) km/s phys.veloc;arith.diff double nullable NF1R [0/132] Number of stars for first term of cost function, red arm (nF1_R) meta.number int NF2R [0/209] Number of stars for second term of cost function, red arm (nF2_R) meta.number int NexpR [0/67] Median number of exposures, red arm (nOther_med_R) meta.number int B_NexpR [0/77] Maximum number of exposures, red arm (nOther_max_R) meta.number int b_NexpR [0/67] Minimum number of exposures, red arm (nOther_min_R) meta.number int e_RVcor2R [0.14/2.5]? Uncertainty of the final RVZP correction ({sigma}{Delta}v), red arm (rv_corr2_unc_R) km/s stat.error double nullable RVcor0Rm [-167/978]? Initial guess of RVZP correction, red arm without H{alpha} (rv_corr0_Rm) km/s phys.veloc;arith.diff double nullable NsRm [0/214] Number of stars in this SEU with Gaia DR2 RVs,red arm without H{alpha} (nStar_fnt_Rm) meta.number int RVcor2Rm [-8.2/15]? Final RVZP correction ({Delta}v), red arm without H{alpha} (rv_corr2_Rm) km/s phys.veloc;arith.diff double nullable spid [1/16] Spectrograph ID meta.id;instr int NF1Rm [0/132] Number of stars for first term of cost function, red arm without H{alpha} (nF1_Rm) meta.number int NF2Rm [0/209] Number of stars for second term of cost function, red arm without H{alpha} (nF2_Rm) meta.number int NexpRm [0/67] Median number of exposures, red arm without H{alpha} (nOther_med_Rm) meta.number int B_NexpRm [0/77] Maximum number of exposures, red arm without H{alpha} (nOther_max_Rm) meta.number int b_NexpRm [0/67] Minimum number of exposures, red arm without H{alpha} (nOther_min_Rm) meta.number int e_RVcor2Rm [0.14/3]? Uncertainty of the final RVZP correction ({sigma}{Delta}v), red arm without H{alpha} (rv_corr2_unc_Rm) km/s stat.error double nullable