J/ApJS/268/19 M2FS & Hectochelle spectra of dSph in the MW halo (Walker+, 2023)
Magellan/M2FS and MMT/Hectochelle spectroscopy of dwarf galaxies and faint star
clusters within the Galactic halo.
Walker M.G., Caldwell N., Mateo M., Olszewski E.W., Pace A.B.,
Bailey J.I.I., Koposov S.E., Roederer I.U.
<Astrophys. J. Suppl. Ser., 268, 19 (2023)>
=2023ApJS..268...19W 2023ApJS..268...19W
ADC_Keywords: Galaxies, dwarf; Milky Way; Spectra, optical; Stars, giant;
Abundances; Parallaxes, trigonometric; Clusters, globular
Keywords: Dark matter ; Milky Way dark matter halo ; Galaxy dark matter halos ;
Dark matter distribution ; Dwarf galaxies ;
Dwarf spheroidal galaxies ; Milky Way stellar halo ;
Spectroscopy ; Radial velocity ; Metallicity ; Chemical abundances
Abstract:
We present spectroscopic data for 16369 stellar targets within and/or
toward 38 dwarf spheroidal galaxies and faint star clusters within the
Milky Way halo environment. All spectra come from observations with
the multiobject, fiber-fed echelle spectrographs M2FS at the
Magellan/Clay telescope or Hectochelle at the MMT, reaching a typical
limiting magnitude G≲21. Data products include processed spectra from
all observations and catalogs listing estimates-derived from template
model fitting-of line-of-sight velocity (median uncertainty 1.4km/s)
effective temperature (255K), (base-10 logarithm of) surface gravity
(0.59dex in cgs units), [Fe/H] (0.4dex) and [Mg/Fe] (0.27dex)
abundance ratios. The sample contains multiepoch measurements for
3720 sources, with up to 15 epochs per source, enabling studies of
intrinsic spectroscopic variability. The sample contains 6087 likely
red giant stars (based on surface gravity), and 4492 likely members
(based on line-of-sight velocity and Gaia-measured proper motion) of
the target systems. The number of member stars per individual target
system ranges from a few, for the faintest systems, to ∼850 for the
most luminous. For most systems, our new samples extend over wider
fields than have previously been observed; of the likely members in
our samples, 820 lie beyond 2 times the projected half-light radius of
their host system, and 42 lie beyond 5 Rhalf.
Description:
We present results from spectroscopic observations of 38 dwarf
galaxies and star clusters within the Galactic halo, conducted over
portions of more than 200 clear nights during the years 2005-2022. All
observations use multiobject, fiber-fed echelle spectrographs at one
of two telescopes. We observe northern targets using the Hectochelle
spectrograph (R∼32000; see Section 2.3) at the 6.5m MMT Observatory in
Arizona, and southern targets using the Michigan/Magellan Fiber System
(M2FS) spectrograph at the 6.5m Magellan/Clay telescope at Las
Campanas Observatory in Chile.
M2FS is a fiber-fed, double spectrograph operating at the f/11 Nasmyth
port of the Magellan/Clay 6.5m telescope at Las Campanas Observatory,
Chile. Each of the two M2FS spectrographs receives light from up to
128 fibers. For the vast majority of M2FS observations reported here,
we use the high-resolution ("HiRes"; R∼24000) grating with both
spectrographs. For a small fraction of M2FS observations reported
here, we use an alternative configuration that has at least one of the
two spectrographs using a medium-resolution (henceforth "MedRes")
grating that gives resolving power R∼7000. See Section 2.2.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table1.dat 84 92 Log of M2FS observations of Galactic halo objects
table2.dat 89 194 Log of MMT/Hectochelle observations of Galactic
halo objects
hectocat.dat 876 31927 Hectochelle catalog (from hectocatalogpublic.fits)
m2fshi.dat 876 16001 M2FS high resolution catalog
(from m2fsHiRescatalog_public.fits)
m2fsmed.dat 876 1439 M2FS medium resolution catalog
(from m2fsMedRescatalog_public.fits)
fits/* . 2 Individual spectra in FITS format in two
subdirectories "hectochelle" and "m2fs"
(from fits_files.tar.gz)
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See also:
II/371 : The Dark Energy Survey (DES): Data Release 2 (Abbott+, 2021)
III/286 : APOGEE-2 DR17 final allStar catalog (Abdurro'uf+, 2022)
VII/195 : Globular Clusters in the Milky Way (Harris, 1996)
VII/202 : Globular Clusters in the Milky Way (Harris, 1997)
V/139 : The SDSS Photometric Catalog, Release 9 (Adelman-McCarthy+, 2012)
VII/270 : SDSS quasar catalog: tenth data release (Paris+, 2014)
I/355 : Gaia DR3 Part 1. Main source (Gaia Collaboration, 2022)
J/AJ/90/2221 : UMi dwarf galaxy BV photometry (Olszewski+, 1985)
J/MNRAS/330/792 : Radial velocity in Draco (Kleyna+, 2002)
J/ApJ/612/447 : Draco 119 and HD 88609 equivalent widths (Fulbright+, 2004)
J/A+A/459/423 : VI and [Fe/H] of Fornax dSph RGB stars (Battaglia+, 2006)
J/AJ/131/895 : Stars in the Carina dwarf spheroidal galaxy (Koch+, 2006)
J/AJ/134/566 : Leo II stellar kinematics (Koch+, 2007)
J/ApJ/657/241 : Spectroscopy of Leo I red giants (Koch+, 2007)
J/MNRAS/380/281 : Faint galactic satellites sp. survey (Martin+, 2007)
J/AJ/136/2050 : SEGUE stellar parameter pipeline. II. (Lee+, 2008)
J/ApJ/675/201 : Radial velocities of stars near Leo I (Mateo+, 2008)
J/A+A/489/403 : Line abundances for solar stars (Pace+, 2008)
J/ApJ/701/1053 : Abundances of 8 stars in the Draco dSph (Cohen+, 2009)
J/ApJS/182/51 : Transition prob. of rare earth elements (Lawler+, 2009)
J/AJ/137/3100 : Radial velocities of 4 dSph galaxies (Walker+, 2009)
J/ApJ/719/931 : Chemical evolution of the UMi dSph (Cohen+, 2010)
J/ApJ/708/560 : Spectroscopy of UMa II and Coma Ber (Frebel+, 2010)
J/ApJS/191/352 : Abundances in stars of MW dwarf satellites (Kirby+, 2010)
J/ApJ/711/350 : Metal-poor giant Boo-1137 abundances (Norris+, 2010)
J/ApJ/736/146 : Radial velocities of stars in Bootes I (Koposov+, 2011)
J/AJ/141/175 : Abundances in M15 RGB/RHB stars (Sobeck+, 2011)
J/AJ/144/4 : Dwarf galaxies in the Local Group (McConnachie+, 2012)
J/ApJS/207/26 : MgH in the A2Π-X2Σ+ system (Hinkle+, 2013)
J/A+A/571/A47 : Extensive linelist of CH in stellar atm. (Masseron+, 2014)
J/ApJS/211/5 : Line data for the Swan system 12C13C (Ram+, 2014)
J/ApJS/214/26 : Line lists for CN isotopes transitions (Sneden+, 2014)
J/ApJ/802/93 : Abundance analysis of 5 stars in Sculptor (Simon+, 2015)
J/MNRAS/448/2717 : Bayesian analysis of resolved stellar sp. (Walker+, 2015)
J/ApJ/808/108 : M2FS stellar spectroscopy of Reticulum 2 (Walker+, 2015)
J/ApJ/819/53 : Magellan/M2FS sp. of Tucana 2 and Grus 1 (Walker+, 2016)
J/AJ/153/254 : Veloc. of RGB stars in Leo II dwarf galaxy (Spencer+, 2017)
J/A+A/616/A10 : Open clusters GaiaDR2 HR diagrams (Gaia Collaboration, 2018)
J/A+A/616/A12 : Gaia DR2 sources in GC and dSph (Gaia Collaboration+, 2018)
J/MNRAS/479/5343 : Nearby dwarf galaxy in Magellanic bridge (Koposov+, 2018)
J/AJ/156/257 : Sp. of RGB stars in Draco & Ursa Minor (Spencer+, 2018)
J/MNRAS/490/3508 : The Southern Stellar Stream Sp. Survey (S5) (Li+, 2019)
J/ApJ/875/77 : PMs of MW satellites with Gaia & DES (Pace+, 2019)
J/MNRAS/490/385 : Massive star clusters NGC 419 and NGC 1846 (Song+, 2019)
J/ApJ/923/77 : Fornax stars M2FS sp. with Gaia EDR3 data (Pace+, 2021)
J/A+A/675/A49 : vlos of Sculptor dSph red giants (Tolstoy+, 2023)
Byte-by-byte Description of file: table[12].dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 17 A17 --- Inst Instrument identifier
19- 28 F10.6 deg RAdeg [14/355] Field center right ascension (J2000)
30- 40 F11.6 deg DEdeg [-79.3/77] Field center declination (J2000)
42- 51 A10 "Y/M/D" Obs.date UT date of the observation
53- 60 A8 "h:m:s" Obs.time UT start time
62- 66 I5 s TExp [671/16200] Exposure time
68- 68 I1 --- Nexp [1/6] Number of exposures
70- 72 I3 --- Ntar [23/240] Number of targets
74- 89 A16 --- Target Target name as in catalogs
--------------------------------------------------------------------------------
Byte-by-byte Description of file: hectocat.dat m2fs*.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 11 A11 --- Inst Instrument used to acquire spectrum
(instrument)
13- 28 A16 --- Target Name of target system (target_system)
30- 64 A35 --- ObjID Unique identifier for this observation
(RAdECHJD) (obj_id)
66- 70 I5 s TExp [671/16200]? Exposure time
(only for Hectochelle) (exptime)
72- 90 I19 --- Gaia ? Gaia DR3 source ID (gaiasourceid)
92- 100 F9.6 mag Gmag [9/22.1]? Gaia DR3 G band magnitude
(gaia_gmag)
102- 110 F9.6 mag BPmag [9.7/23]? Gaia DR3 BP magnitude
(gaia_bpmag)
112- 120 F9.6 mag RPmag [8.5/23]? Gaia DR3 RP magnitude
(gaia_rpmag)
122- 132 E11.6 mag e_Gmag [1.3e-8/0.01]? Uncertainty on Gmag
(gaia_siggmag)
134- 144 E11.6 mag e_BPmag [1e-7/2]? Uncertainty on BPmag
(gaia_sigbpmag)
146- 156 E11.6 mag e_RPmag [1.8e-10/53]? Uncertainty on RPmag
(gaia_sigrpmag)
158- 166 F9.6 mag Gmag0 [9/22]? Gaia dereddened G-band magnitude
(gaiagmagdered)
168- 176 F9.6 mag BPmag0 [9.5/23]? Gaia dereddened BP-band
magnitude (gaiabpmagdered)
178- 186 F9.6 mag RPmag0 [8.4/23]? Gaia dereddened RP-band
magnitude (gaiarpmagdered)
188- 195 F8.3 mas/yr pmRA [-111/99]? Gaia DR3 proper motion in RA
(gaia_pmra)
197- 204 F8.3 mas/yr pmDE [-124/109]? Gaia DR3 proper motion in
declination (gaia_pmdec)
206- 210 F5.3 mas/yr e_pmRA [0.01/3.3]? pmRA uncertainty
(gaia_sigpmra)
212- 216 F5.3 mas/yr e_pmDE [0.008/3.3]? pmDE uncertainty
(gaia_sigpmdec)
218- 224 F7.4 mas plx [-8.1/20]? Gaia DR3 parallax
(gaia_parallax)
226- 232 F7.4 mas e_plx [0.01/5]? plx uncertainty
(gaia_sigparallax)
234- 248 F15.11 deg RAdeg [13.9/355.4] Right ascension (J2000) (ra)
250- 264 F15.11 deg DEdeg [-79.5/77.5] Declination (J2000) (dec)
266- 280 A15 --- r_Pos Position reference (radecsource)
282- 292 F11.3 d HJD Heliocentric Julian Date of
spectroscopic observation (hjd)
294- 300 F7.2 --- S/N [-11/1077] Median signal-to-noise ratio
per pixel (sn_ratio)
302- 308 F7.2 km/s Vlosraw [-513/505] Mean of posterior PDF for
VLOS (solar rest frame) without shift
to APOGEE zero-point (vlos_raw)
310- 316 F7.2 km/s e_Vlosraw [0.07/463] Vlosraw standard deviation,
as sampled by MultiNest (vlosrawerror)
318- 324 F7.2 --- skVlosraw [-112/141] Skewness of posterior PDF for
VLOS (vlosrawskew)
326- 333 F8.2 --- ktVlosraw [-2/20194] Kurtosis of posterior PDF for
VLOS (vlosrawkurtosis)
335- 341 F7.2 km/s Vlos [-512/505] Vlosraw, shifted to APOGEE
zero-point (vlos)
343- 348 F6.2 km/s e_Vlos [0.3/479] Vlos and Vlos raw uncertainty
after applying adjustment in Section 4.2
(vlos_error)
350- 355 F6.1 K Teffraw [3907/7459] Mean of posterior PDF for
Teff, without shift to APOGEE zero-point
(teff_raw)
357- 362 F6.1 K e_Teffraw [7/1299] Standard deviation of posterior
PDF for Teff, as sampled by MultiNest
(teffrawerror)
364- 368 F5.2 --- skTeffraw [-6/22] Skewness of posterior PDF for
Teff, as sampled by MultiNest
(teffrawskew)
370- 375 F6.2 --- ktTeffraw [-2/638] Kurtosis of posterior PDF for
Teff, as sampled by MultiNest
(teffrawkurtosis)
377- 382 F6.1 K Teff [4050/7680] Teffraw, shifted to APOGEE
zero-point (teff)
384- 389 F6.1 K e_Teff [8/1482] Error in teff_raw and teff,
after applying adjustment in Section 4.2
(teff_error)
391- 395 F5.3 [cm/s2] loggraw [0.02/5] Mean of posterior PDF for logg,
without shift to APOGEE zero-point
(logg_raw)
397- 401 F5.3 [cm/s2] e_loggraw [0.02/2] Standard deviation of posterior
PDF for logg, as sampled by MultiNest
(loggrawerror)
403- 407 F5.2 --- skloggraw [-8.5/15] Skewness of posterior PDF for
logg, as sampled by MultiNest
(loggrawskew)
409- 414 F6.2 --- ktloggraw [-2/252] Kurtosis of posterior PDF for
logg, as sampled by MultiNest
(loggrawkurtosis)
416- 420 F5.3 [cm/s2] logg [0.5/5.5] Loggraw, shifted to APOGEE
zero-point (logg)
422- 426 F5.3 [cm/s2] e_logg [0.02/2.1] Error in loggraw and logg,
after applying adjustment in Section 4.2
(logg_error)
428- 434 F7.4 [-] FeHraw [-4/0.5] Mean of posterior PDF for
[Fe/H] without shift to APOGEE
zero-point (feh_raw)
436- 441 F6.4 [-] e_FeHraw [0.009/2] Standard deviation of
posterior PDF for [Fe/H], as sampled by
MultiNest (fehrawerror)
443- 448 F6.2 --- skFeHraw [-13/12.3] Skewness of posterior PDF for
[Fe/H], as sampled by MultiNest
(fehrawskew)
450- 455 F6.2 --- ktFeHraw [-2/252] Kurtosis of posterior PDF for
[Fe/H], as sampled by MultiNest
(fehrawkurtosis)
457- 462 F6.3 [-] [Fe/H] [-3.8/0.7] Fehraw, shifted to APOGEE
zero-point (feh)
464- 468 F5.3 [-] e_[Fe/H] [0.01/2] Error in fehraw and feh, after
applying adjustment in Section 4.2
(feh_error)
470- 476 F7.4 [-] MgFeraw [-0.8/1] Mean of posterior PDF for
[Mg/Fe] without shift to APOGEE
zero-point (mgfe_raw)
478- 483 F6.4 [-] e_MgFeraw [0.009/0.7] Standard deviation of
posterior PDF for [Mg/Fe], as sampled by
MultiNest (mgferawerror)
485- 489 F5.2 --- skMgFeraw [-9.1/9.3] Skewness of posterior PDF for
[Mg/Fe], as sampled by MultiNest
(mgferawskew)
491- 496 F6.2 --- ktMgFeraw [-2/231] Kurtosis of posterior PDF for
[Mg/Fe], as sampled by MultiNest
(mgferawkurtosis)
498- 503 F6.3 [-] [Mg/Fe] [-1/1] Mgferaw, shifted to APOGEE
zero-point (mgfe)
505- 509 F5.3 [-] e_[Mg/Fe] [0.01/0.8] Error in mgferaw and mgfe,
after applying adjustment in Section 4.2
(mgfe_error)
511- 517 F7.5 0.1nm smoothRaw [0.06/0.4] Bandwidth σLSF
(Angstroms), of Gaussian smoothing
kernel applied to template spectra
(smooth_raw)
519- 525 F7.5 0.1nm e_smoothRaw [0.0003/0.07] Standard deviation of
posterior PDF for σLSF, as
sampled by MultiNest (smoothrawerror)
527- 531 F5.2 --- sksmoothRaw [-4.5/12] Skewness of posterior PDF for
σLSF, as sampled by MultiNest
(smoothrawskew)
533- 538 F6.2 --- ktsmoothRaw [-2/310] Kurtosis of posterior PDF for
σLSF, as sampled by MultiNest
(smoothrawkurtosis)
540- 547 F8.3 e MedSky [-13/1187]? Median count of sky spectrum
that was subtracted (median_sky)
549- 554 F6.3 e s_MedSky [0.01/49]? Standard deviation of
median_sky, over spectra acquired in
same observation
(standarddeviationmedian_sky)
556- 561 A6 --- Filt [RV31 ,HiRes,MedRes] Filter used for
observation (filter_name)
563- 570 F8.2 --- Chi2 [0.2/79782]? χ2 for best-fitting
model spectrum, using original variance
spectrum (chi2)
572- 578 F7.3 --- Chi2r [0.07/247]? χ2 for best-fitting
model spectrum, using rescaled variance
spectrum from Equation (15)
(chi2_rescaled)
580- 583 I4 --- Npix [0/2043] Number of (unmasked) pixels
included in spectrum fit (npix)
585- 593 F9.2 e w5163 [-203/101081]? Median (sky-subtracted)
counts over spectral range 5160-5167Å
(w5163)
595- 602 F8.2 e w5180 [-241/84592]? Median (sky-subtracted)
counts over spectral range 5176-5183Å
(w5180)
604- 609 F6.2 km/s VhelioCorr [-29.4/28.7] Heliocentric correction
that was applied (added) to VLOS after
spectrum model fitting
(vhelio_correction)
611- 674 A64 --- FileName Name of multiextension FITS file
containing processed spectrum
in subdirectory "fits" (fits_filename)
676- 678 I3 --- Index [0/239] Index containing the spectrum of
this source (fits_index)
680- 681 I2 --- Obs [1/15] (chronological) observation
number for this source (obs) (1)
683- 684 I2 --- Nobs [1/15] Total number of observations of
this source (n_obs)
686- 687 I2 --- Goodobs [0/15] (chronological) observation
number for this source, after
quality-control filter (good_obs) (1)
689- 690 I2 --- goodNobs [0/15] Total number of observations of
this source, after quality-control
filter (goodnobs)
692- 698 F7.2 km/s VlosrawAvg [-498/505]? (inverse-variance) weighted
mean of vlos_raw (solar rest frame) over
goodNobs observations (vlosrawmean)
700- 706 F7.2 km/s VlosAvg [-498/505]? VlosrawAvg shifted to APOGEE
zero-point (vlos_mean)
708- 711 F4.2 km/s e_VlosAvg [0.1/7]? Error in VlosrawAvg and VlosAvg
(vlosmeanerror)
713- 718 F6.2 km/s s_VlosAvg [0/203]? (inverse-variance) weighted
standard deviation of Vlos over
goodNobs observations (vlosmeanscatter)
720- 725 F6.1 K TeffrawAvg [3907/7422]? (inverse-variance) weighted
mean of Teffraw over goodNobs
observations (teffrawmean)
727- 732 F6.1 K TeffAvg [4052/7628]? TeffrawAvg shifted to
APOGEE zero-point (teff_mean)
734- 739 F6.1 K e_TeffAvg [6/1177]? Error in TeffrawAvg and
TeffAvg (teffmeanerror)
741- 746 F6.2 K s_TeffAvg [0/910]? (inverse-variance) weighted
standard deviation of Teff over goodNobs
observations (teffmeanscatter)
748- 752 F5.3 [cm/s2] loggrawAvg [0.03/5]? (inverse-variance) weighted
mean of loggraw over goodNobs
observations (loggrawmean)
754- 758 F5.3 [cm/s2] loggAvg [0.5/5.5]? LoggrawAvg shifted to APOGEE
zero-point (logg_mean)
760- 764 F5.3 [cm/s2] e_loggAvg [0.02/2.1]? Error in loggrawAvg and
loggAvg (loggmeanerror)
766- 770 F5.3 [cm/s2] s_loggAvg [0/2]? (inverse-variance) weighted
standard deviation of logg over goodNobs
observations (loggmeanscatter)
772- 777 F6.3 [-] FeHrawAvg [-4/0.5]? (inverse-variance) weighted
mean of feh_raw over goodNobs
observations (fehrawmean)
779- 784 F6.3 [-] FeHAvg [-3.8/0.7]? FeHrawAvg shifted to APOGEE
zero-point (feh_mean)
786- 790 F5.3 [-] e_FeHAvg [0.01/2]? Error in fehrawmean and
feh_mean (fehmeanerror)
792- 796 F5.3 [-] s_FeHAvg [0/2]? (inverse-variance) weighted
standard deviation of [Fe/H] over
goodNobs observations (fehmeanscatter)
798- 804 F7.4 [-] MgFerawAvg [-0.8/1]? (inverse-variance) weighted
mean of mgfeRaw over goodNobs
observations (mgferawmean)
806- 812 F7.4 [-] MgFeAvg [-1/1]? MgferawAvg, shifted to APOGEE
zero-point (mgfe_mean)
814- 819 F6.4 [-] e_MgFeAvg [0.009/0.7]? Error in mgferawmean and
mgfe_mean (mgfemeanerror)
821- 826 F6.4 [-] s_MgFeAvg [0/0.7]? (inverse-variance) weighted
standard deviation of [Mg/Fe] over
goodNobs observations (mgfemeanscatter)
828 I1 --- Ncal [1/3]? Number of ThArNe calibration
frames used for wavelength calibration
(only for M2FS) (nwavcal)
830- 833 F4.1 degC TempMin [8.6/20.4]? Minimum temperature
(°C) recorded at detector during
science subexposures (only for M2FS)
(temp_min)
835- 838 F4.1 degC TempMax [8.8/21.1]? Maximum temperature
(°C) recorded at detector during
science subexposures (only for M2FS)
(temp_max)
840 I1 --- f_cal [0/1]? True if nwavcal=1 and
tempmax-tempmin≥1°C
(only for M2FS) (wavcalflag)
842 I1 --- f_Chi2 [0/1] True if chi2 is above the curve in
the top panels of Figure 15 (chi2_flag)
844 I1 --- f_C [0/1] True if flux ratio W5163/W5180 is
below the curve in the bottom panels of
Figure 15 (carbon_flag)
846 I1 --- f_Chi2any [0/1] True if any observations
contributing to mean have f_Chi2=True
(anychi2flag)
848 I1 --- f_Cany [0/1] True if any observations
contributing to mean have f_C=True
(anycarbonflag)
850 I1 --- f_Vlosvar [0/1] True if
vlosmeanscatter≥3vlosmeanerror
(vlosvariableflag)
852 I1 --- f_Teffvar [0/1] True if
teffmeanscatter≥3teffmeanerror
(teffvariableflag)
854 I1 --- f_loggvar [0/1] True if
loggmeanscatter≥3loggmeanerror
(loggvariableflag)
856 I1 --- f_fehvar [0/1] True if
fehmeanscatter≥3fehmeanerror
(fehvariableflag)
858 I1 --- f_mgfevar [0/1] True if
mgfemeanscatter≫=3mgfemeanerror
(mgfevariableflag)
860- 872 A13 --- f_gaiavar Gaia (DR3) photvariableflag
(gaiaphotvariable_flag)
874 I1 --- RRL [0/1] True if source is listed in Gaia
DR3 variability RR Lyrae table
(vari_rrlyrae) (gaia_rrl)
876 I1 --- AGN [0/1] True if source is listed in Gaia
DR3 variability AGN catalog (vari_agn)
(gaia_agn)
--------------------------------------------------------------------------------
Note (1): Most users will need to be mindful of the "obs" and/or "good_obs"
columns, which indicate for a given star the chronologically ordered
observation number.
A star having only one observation will have "obs = 1," but for stars
observed multiple times, the first observation will have "obs = 1,"
the second will have "obs = 2," etc. The "good_obs" parameter works
the same way, but counts only those observations that pass our crude
quality-control filter (velocity error km/s); all measurements for
stars having zero "good" measurements will have good_obs = 0.
--------------------------------------------------------------------------------
History:
From electronic version of the journal for tables and catalogs
Spectra downloaded at: http://zenodo.org/records/7837922
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 23-Nov-2023