V/153 LAMOST DR4 catalogs (Luo+, 2018)
The fourth data release (DR4) of the LAMOST regular survey.
Luo A.-L., Zhao Y.-H., Zhao G., et al.
<Res. Astron Astrophys., in prep. (2018)>
=2018yCat.5153....0L 2018yCat.5153....0L
=2018RAA..in.prep..L
ADC_Keywords: Surveys ; Spectroscopy ; Photometry
Keywords: techniques: spectroscopic survey - data release - catalog
Description:
The Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST)
is a Chinese national scientific research facility operated by the
National Astronomical Observatories, Chinese Academy of Sciences. It
is a special reflecting Schmidt telescope with 4000 fibers in a field
of view of 20 deg22in the sky. Until July 2016, LAMOST has completed
its pilot survey which was launched in October 2011 and ended in June
2012, and the first four years of regular survey which was initiated
on September 2012. After this five-year-survey, we totally obtain
7,617,035 spectra, which consist of stars, galaxies, quasars and other
unknown objects. Now, the fourth data release (DR4) has
published online (http://dr4.lamost.org/), and released data products
include
1. Spectra. - In general, there are 7,617,035 flux- and
wavelength-calibrated, sky-subtracted spectra in DR4, including
6,943,865 stars, 117,254 galaxies, 36,575 quasars, and 519,341 unknown
objects, and these spectra cover the wavelength range of 3690-9100
angstrom with a resolution of 1800 at the 5500 angstrom.
2. Spectroscopic Parameters Catalogs. - In this data release, six
spectroscopic parameters catalogs are also published, they are the
LAMOST general catalog, the A, F, G and K type star catalog, the A
type star catalog, the M dwarf catalog, the observed plate information
catalog, and the input catalog respectively. For the first four
catalogs, they all include 36 columns of basic spectroscopic
information, for example, right ascension, declination, signal to
noise ratio, magnitude, classification and redshift. Also, the A type
star catalog publish line indices of six spectral lines and four
balmer line widths at 20% below the local continua, the A, F, G and K
type star catalog provides effective temperature, surface gravity, and
metallicity, and the M dwarf catalog releases the equivalent width of
Halpha line, ten line indices, one metallicity sensitive parameter and
a flag that indicates whether or not exist magnetic activity. For the
observed plate information catalog, it mainly contains nine basic
plate information for all published plates. At last, the input catalog
includes 24 basic fields mentioned above, and three new fields which
are not included in the above catalogs.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
dr4.dat 408 7620612 LAMOST DR4 catalog (09/08/2018 version)
stellar4.dat 459 4537436 A, F, G and K type stars catalog
astars4.dat 650 364369 A type stars catalog
mstars4.dat 712 433481 M type stars catalog
dr4_plan.dat 106 3461 Observed plate information catalog
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See also:
V/146 : LAMOST DR1 catalogs (Luo+, 2015)
V/149 : LAMOST DR2 catalogs (Luo+, 2016)
http://dr4.lamost.org : LAMOST DR4 Home Page
Byte-by-byte Description of file: dr4.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 9 I9 --- ObsID [101001/462816250] Observation ID
11- 29 A19 --- Target Target Designation (JHHMMSS.ss+DDMMSS.s)
31- 40 A10 "date" Obs.Date Target Observation Date
42- 46 I5 --- LMJD [55859/57542] Local Modified Julian Day
48- 52 I5 --- MJD [55858/57541] Modified Julian Day
54- 73 A20 --- PlanId Plan Name
75- 76 I02 --- spId [1/16] Spectrograph ID
78- 80 I03 --- FiberId [1/250] Fiber ID
82- 95 F14.10 deg RAdeg Fiber pointing right ascension (J2000)
97-109 F13.10 deg DEdeg Fiber pointing declination (J2000)
111-116 F6.2 --- snru ?=-9999 Signal Noise Ratio of u filter
118-123 F6.2 --- snrg ?=-9999 Signal Noise Ratio of g filter
125-130 F6.2 --- snrr ?=-9999 Signal Noise Ratio of r filter
132-137 F6.2 --- snri ?=-9999 Signal Noise Ratio of i filter
139-144 F6.2 --- snrz ?=-9999 Signal Noise Ratio of z filter
146-155 A10 --- objType Object Type
157-163 A7 --- Class Spectra Type
165-174 A10 --- SubClass Stellar Sub-Class
176-191 F16.10 --- z ?=-9999 Redshift
193-211 F19.10 --- e_z []?=-9999 rms uncertainty on z
213-222 A10 --- magType Target Magnitude Type
224-228 F5.2 --- mag1 ?=99 Magnitude in Band 1 of magType
230-234 F5.2 --- mag2 ?=99 Magnitude in Band 2 of magType
236-240 F5.2 --- mag3 ?=99 Magnitude in Band 3 of magType
242-246 F5.2 --- mag4 ?=99 Magnitude in Band 4 of magType
248-252 F5.2 --- mag5 ?=99 Magnitude in Band 5 of magType
254-258 F5.2 --- mag6 ?=99 Magnitude in Band 6 of magType
260-264 F5.2 --- mag7 ?=99 Magnitude in Band 7 of magType
266-275 A10 --- tsource Organization or person who submits input
catalog
277-281 A5 --- FiberType Fiber Type of target
(Obj, Sky, F-std, Unused, PosErr, Dead)
283-296 A14 --- tfrom Input catalog submitted by an organization or
a person determined by the tsource
298-370 A73 --- tInfo Target ID from SDSS, UCAC4, PANSTAR and
other catalogue
372 I1 --- n_offset [0/1] Whether there is a fiber offset
during observation
374-379 F6.3 arcsec offset [0/99] If offset is true, it gives the offset
distance from the target's coordinator in
input catalog
381-394 F14.10 --- RA1deg Rigth ascension from input catalog (J2000)
396-408 F13.10 --- DE1deg Declination from input catalog (J2000)
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Byte-by-byte Description of file: stellar4.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 9 I9 --- ObsID [101001/462816247] Observation ID
11- 29 A19 --- Target Target Designation (JHHMMSS.ss+DDMMSS.s)
31- 40 A10 "date" ObsDate Target Observation Date
42- 46 I5 d LMJD [55859/57542] Local Modified Julian Day
48- 52 I5 d MJD [55858/57541] Modified Julian Day
54- 73 A20 --- PlanId Plan Name
75- 76 I2 --- spId [1/16] Spectrograph ID
78- 80 I3 --- FiberId [1/250] Fiber ID
82- 95 F14.10 deg RAdeg Fiber pointing right Ascension (J2000)
97-109 F13.10 deg DEdeg Fiber pointing declination (J2000)
111-116 F6.2 --- snru Signal Noise Ratio of u filter
118-123 F6.2 --- snrg Signal Noise Ratio of g filter
125-130 F6.2 --- snrr Signal Noise Ratio of r filter
132-137 F6.2 --- snri Signal Noise Ratio of i filter
139-144 F6.2 --- snrz Signal Noise Ratio of z filter
146-155 A10 --- objType Object Type
157-160 A4 --- Class Stellar Class
162-166 A5 --- SubClass Stellar Sub-Class
168-180 F13.10 --- z Redshift
182-194 F13.10 --- e_z [] rms uncertainty on z
196-205 A10 --- magType Target Magnitude Type
207-211 F5.2 mag mag1 ?=99 Magnitude in band 1 of magType
213-217 F5.2 mag mag2 ?=99 Magnitude in band 2 of magType
219-223 F5.2 mag mag3 ?=99 Magnitude in band 3 of magType
225-229 F5.2 mag mag4 ?=99 Magnitude in band 4 of magType
231-235 F5.2 mag mag5 ?=99 Magnitude in band 5 of magType
237-241 F5.2 mag mag6 ?=99 Magnitude in band 6 of magType
243-247 F5.2 mag mag7 ?=99 Magnitude in band 7 of magType
249-258 A10 --- tsource Organization or person who submits input
catalog
260-264 A5 --- FiberType Fiber Type of target
(Obj, Sky, F-std, Unused, PosErr, Dead)
266-279 A14 --- tfrom Input catalog submitted by an organization
or a person determined by the tsource
281-353 A73 --- tInfo Target ID from SDSS, UCAC4, PANSTAR and
other catalogue
355 I1 --- n_offset [0/1] Whether there is a fiber offset during
observation
357-362 F6.3 arcsec offset If offset is true, it gives the offset
distance from the target's coordinator
in input catalog
364-377 F14.10 deg RA1deg Right ascension from input catalog (J2000)
379-391 F13.10 deg DE1deg Declination from input catalog (J2000)
393-399 F7.2 K Teff Effective temperature
401-408 F8.2 K e_Teff ?=-9999 Uncertainty of Effective temperature
410-415 F6.3 [cm/s2] logg Surface gravity
417-425 F9.3 [cm/s2] e_logg ?=-9999 Uncertainty of Surface gravity
427-432 F6.3 [-] [Fe/H] Metallicity
434-442 F9.3 [-] e_[Fe/H] ?=-9999 Uncertainty of Metallicity
444-450 F7.2 km/s HRV ? Heliocentric Radial Velocity
452-459 F8.2 km/s e_HRV ?=-9999 Uncertainty of Heliocentric Radial
Velocity
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Byte-by-byte Description of file: astars4.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 9 I9 --- ObsID [101006/462816238] Observation ID
11- 29 A19 --- Target Target Designation (JHHMMSS.ss+DDMMSS.s)
31- 40 A10 "date" ObsDate Target Observation Date
42- 46 I5 d LMJD [55859/57542] Local Modified Julian Day
48- 52 I5 d MJD [55858/57541] Modified Julian Day
54- 73 A20 --- PlanId Plan Name
75- 76 I2 --- spId [1/16] Spectrograph ID
78- 80 I3 --- FiberId [1/250] Fiber ID
82- 95 F14.10 deg RAdeg Fiber pointing right Ascension (J2000)
97-109 F13.10 deg DEdeg Fiber pointing declination (J2000)
111-116 F6.2 --- snru ? Signal Noise Ratio of u filter
118-123 F6.2 --- snrg ?=9999 Signal Noise Ratio of g filter
125-130 F6.2 --- snrr ?=9999 Signal Noise Ratio of r filter
132-137 F6.2 --- snri ?=9999 Signal Noise Ratio of i filter
139-144 F6.2 --- snrz ?=9999 Signal Noise Ratio of z filter
146-155 A10 --- objType Object Type
157-160 A4 --- Class Stellar Class
162-166 A5 --- SubClass Stellar Sub-Class
168-183 F16.10 --- z ?=-9999 Redshift
185-200 F16.10 --- e_z []?=-9999 rms uncertainty on z
202-211 A10 --- magType Target Magnitude Type
213-217 F5.2 mag mag1 ?=99 Magnitude in band 1 of magType
219-223 F5.2 mag mag2 ?=99 Magnitude in band 2 of magType
225-229 F5.2 mag mag3 ?=99 Magnitude in band 3 of magType
231-235 F5.2 mag mag4 ?=99 Magnitude in band 4 of magType
237-241 F5.2 mag mag5 ?=99 Magnitude in band 5 of magType
243-247 F5.2 mag mag6 ?=99 Magnitude in band 6 of magType
249-253 F5.2 mag mag7 ?=99 Magnitude in band 7 of magType
255-264 A10 --- tsource Organization or person who submits input
catalog
266-270 A5 --- FiberType Fiber Type of target
(Obj, Sky, F-std, Unused, PosErr, Dead)
272-285 A14 --- tfrom Input catalog submitted by an organization or
a person determined by the tsource
287-359 A73 --- tInfo Target ID from SDSS, UCAC4, PANSTAR and
other catalogue
361 I1 --- n_offset [0/1] Whether there is a fiber offset during
observation
363-367 F5.3 arcsec offset If offset is true, it gives the offset
distance from the target's coordinator in
input catalog
369-382 F14.10 --- RA1deg Right ascension from input catalog (J2000)
384-396 F13.10 --- DE1deg Declination from input catalog (J2000)
398-407 F10.2 0.1nm KP12 ?=-9999 Ca II K line index with band widths
of 12Å
409-418 F10.2 0.1nm KP18 ?=-9999 Ca II K line index with band widths
of 18Å
420-428 F9.2 0.1nm KP6 ?=-9999 Ca II K line index with band widths
of 6Å
430-437 F8.2 0.1nm Hdelta12 ?=-9999 Hdelta Line Index with band widths
of 12Å
439-446 F8.2 0.1nm Hdelta24 ?=-9999 Hdelta Line Index with band widths
of 24Å
448-456 F9.2 0.1nm Hdelta48 ?=-9999 Hdelta Line Index with band widths
of 48Å
458-466 F9.2 0.1nm Hdelta62 ?=-9999 Hdelta Line Index with band widths
of 62Å
468-475 F8.2 0.1nm Hgamma12 ?=-9999 Hgamma Line Index with band widths
of 12Å
477-485 F9.2 0.1nm Hgamma24 ?=-9999 Hgamma Line Index with band widths
of 24Å
487-495 F9.2 0.1nm Hgamma48 ?=-9999 Hgamma Line Index with band widths
of 48Å
497-505 F9.2 0.1nm Hgamma54 ?=-9999 Hgamma Line Index with band widths
of 54Å
507-516 F10.2 0.1nm Hbeta12 ?=-9999 Hbeta Line Index with band widths
of 12Å
518-527 F10.2 0.1nm Hbeta24 ?=-9999 Hbeta Line Index with band widths
of 24Å
529-538 F10.2 0.1nm Hbeta48 ?=-9999 Hbeta Line Index with band widths
of 48Å
540-549 F10.2 0.1nm Hbeta60 ?=-9999 Hbeta Line Index with band widths
of 60Å
551-558 F8.2 0.1nm Halpha12 ?=-9999 Halpha Line Index with band widths
of 12Å
560-567 F8.2 0.1nm Halpha24 ?=-9999 Halpha Line Index with band widths
of 24Å
569-576 F8.2 0.1nm Halpha48 ?=-9999 Halpha Line Index with band widths
of 48Å
578-585 F8.2 0.1nm Halpha70 ?=-9999 Halpha Line Index with band widths
of 70Å
587-594 F8.2 0.1nm Pa13 ?=-9999 Paschen line index from local
continuum at 8467.5 with band widths
of 13.0Å
596-604 F9.2 0.1nm Pa142 ?=-9999 Paschen line index from local
continuum at 8598.0 with band widths
of 42.0Å
606-614 F9.2 0.1nm Pa242 ?=-9999 Paschen line index from local
continuum at 8751.0 with band widths
of 42.0Å
616-623 F8.2 0.1nm HaD0.2 ?=-9999 Width at 20% below the local continuum
of Halpha line
625-632 F8.2 0.1nm HbD0.2 ?=-9999 Width at 20% below the local continuum
of beta line
634-641 F8.2 0.1nm HgD0.2 ?=-9999 Width at 20% below the local continuum
of Hgamma line
643-650 F8.2 0.1nm HdD0.2 ?=-9999 Width at 20% below the local continuum
of Hdelta line
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Byte-by-byte Description of file: mstars4.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 9 I9 --- ObsID [101050/462815158] Observation ID
11- 29 A19 --- Target Target Designation (JHHMMSS.ss+DDMMSS.s)
31- 40 A10 "date" ObsDate Target Observation Date
42- 46 I5 d LMJD [55859/57542] Local Modified Julian Day
48- 52 I5 d MJD [55858/57541] Modified Julian Day
54- 73 A20 --- PlanId Plan Name
75- 76 I2 --- spId [1/16] Spectrograph ID
78- 80 I3 --- FiberId [1/250] Fiber ID
82- 95 F14.10 deg RAdeg Fiber pointing right Ascension (J2000)
97-109 F13.10 deg DEdeg Fiber pointing declination (J2000)
111-115 F5.2 --- snru ? Signal Noise Ratio of u filter
117-122 F6.2 --- snrg ? Signal Noise Ratio of g filter
124-129 F6.2 --- snrr ? Signal Noise Ratio of r filter
131-136 F6.2 --- snri ? Signal Noise Ratio of i filter
138-143 F6.2 --- snrz ? Signal Noise Ratio of z filter
145-154 A10 --- objType Object Type
156-159 A4 --- Class Stellar Class
161-162 A2 --- SubClass Stellar Sub-Class
164-179 F16.10 --- z ?=-9999 Redshift
181-199 F19.10 --- e_z []?=-9999 rms uncertainty on z
201-210 A10 --- magType Target Magnitude Type
212-216 F5.2 mag mag1 ?=99 Magnitude in band 1 of magType
218-222 F5.2 mag mag2 ?=99 Magnitude in band 2 of magType
224-228 F5.2 mag mag3 ?=99 Magnitude in band 3 of magType
230-234 F5.2 mag mag4 ?=99 Magnitude in band 4 of magType
236-240 F5.2 mag mag5 ?=99 Magnitude in band 5 of magType
242-246 F5.2 mag mag6 ?=99 Magnitude in band 6 of magType
248-252 F5.2 mag mag7 ?=99 Magnitude in band 7 of magType
254-263 A10 --- tsource Organization or person who submits
input catalog
265-269 A5 --- FiberType Fiber Type of target
(Obj, Sky, F-std, Unused, PosErr, Dead)
271-284 A14 --- tfrom Input catalog submitted by an organization or
a person determined by the tsource
286-358 A73 --- tInfo Target ID from SDSS, UCAC4, PANSTAR and
other catalogue
360 I1 --- n_offset [0/1] Whether there is a fiber offset during
observation
362-367 F6.3 arcsec offset If offset is true, it gives the offset
distance from the target's coordinator
in input catalog
369-382 F14.10 --- RA1deg Right ascension from input catalog (J2000)
384-396 F13.10 --- DE1deg Declination from input catalog (J2000)
398-409 F12.6 0.1nm EWHa ?=-9999 Halpha equivalent width
411-423 F13.6 0.1nm e_EWHa ?=-9999 rms uncertainty on EWHa
425-436 F12.6 --- TiO5 ?=-9999 Spectral index of TiO5
438-449 F12.6 --- CaH2 ?=-9999 Spectral index of CaH2
451-462 F12.6 --- CaH3 ?=-9999 Spectral index of CaH3
464-475 F12.6 --- TiO1 ?=-9999 Spectral index of TiO1
477-488 F12.6 --- TiO2 ?=-9999 Spectral index of TiO2
490-501 F12.6 --- TiO3 ?=-9999 Spectral index of TiO3
503-514 F12.6 --- TiO4 ?=-9999 Spectral index of TiO4
516-527 F12.6 --- CaH1 ?=-9999 Spectral index of CaH1
529-540 F12.6 --- CaOH ?=-9999 Spectral index of CaOH
542-554 F13.6 --- e_TiO5 ?=-9999 rms uncertainty on TiO5
556-567 F12.6 --- e_CaH2 ?=-9999 rms uncertainty on CaH2
569-580 F12.6 --- e_CaH3 ?=-9999 rms uncertainty on CaH3
582-594 F13.6 --- e_TiO1 ?=-9999 rms uncertainty on TiO1
596-608 F13.6 --- e_TiO2 ?=-9999 rms uncertainty on TiO2
610-622 F13.6 --- e_TiO3 ?=-9999 rms uncertainty on TiO3
624-636 F13.6 --- e_TiO4 ?=-9999 rms uncertainty on TiO4
638-650 F13.6 --- e_CaH1 ?=-9999 rms uncertainty on CAH1
652-663 F12.6 --- e_CaOH ?=-9999 rms uncertainty on CaOH
665-676 F12.6 --- zeta ?=-9999 Metallicity sensitive parameter
678-690 F13.6 --- e_zeta ?=-9999 rms uncertainty on zeta
692-699 F8.2 --- MA ?=-9999 Magnetic activity
701-712 F12.6 0.1nm NA ?=-9999 Line index of Na Line
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Byte-by-byte Description of file: dr4_plan.dat
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Bytes Format Units Label Explanations
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1- 4 I4 --- PlateId Plate ID
6- 15 A10 "date" ObsDate Target Observation Date
17- 36 A20 --- PlanId Plan Name
38- 48 F11.7 deg RA1deg Right Ascension of center star (J2000)
50- 59 F10.7 deg DE1deg Declination of center star (J2000)
61- 64 F4.2 mag mag1 Magnitude of the first exposure
66- 72 F7.2 --- Seeing Seeing of the first exposure
74- 97 A24 s ExpTime The total exposure time of n time exposures
99-106 I8 min MJM Modified Julian Minute at the start
time of each plate
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History:
Copied at http://dr4.lamost.org/catalogue
(End) Patricia Vannier [CDS] 09-Aug-2018