MWM Science Validation

WEAVE: The cross-calibration sample includes 4 GCs and 3 OCs, all equatorial (-4 < dec < + 18) chosen to cover the metallicity range between [Fe/H] -2.5 to +0.0. Targets within them are selected to be FGK stars. The clusters are:

• • GCs
    • NGC 5904 [Fe/H]=-1.3   488 stars
    • NGC 6254 [Fe/H]=-1.6    317
    • NGC 7078 [Fe/H]=-2.3    288
    • NGC 6838 [Fe/H]=-0.8    257
  • OCs
    • NGC_2112     [Fe/H]=-0.1   644    
    • Trumpler_5    [Fe/H]=-0.4    779
    • M67             [Fe/H]=0       1411

The cross-calibration yso cartons contain targets selected as validators/calibrators by the 4MOST survey of young stars (4SYS or S12). The scope of these cartons is to obtain APOGEE spectra of the same targets to have a small sample for cross-validation between the surveys.
WEAVE might be included in the future as well.

The labels to be validated are essentially: Teff, logg, [Fe/H], and, where possible, vsini.

Both cross-calibration yso catalogues contain two sets of targets.

1. Targets in common between 4SYS,  APOGEE (dr17), and Gaia ESO (dr6). The targets are member of young/intermediate age clusters and are in the temperature range 3000-5500 K.
2. Targets that are members of the same clusters as 1. (from Cantat-Gaudin+20), x-matched with Gaia DR3 AP, with Teff < 5800 and logg > 3.8.

We also applied additional cuts to comply with the SNR requirement of APOGEE H < 13 mag.

The cross-calibration yso cartons contain targets selected as validators/calibrators by the 4MOST survey of young stars (4SYS or S12). The scope of these cartons is to obtain BOSS spectra of the same targets to have a small sample for cross-validation between the surveys.
WEAVE might be included in the future as well.

The labels to be validated are essentially: Teff, logg, [Fe/H], and, where possible, vsini.

Both cross-calibration yso catalogues contain two sets of targets.

1. Targets in common between 4SYS,  APOGEE (dr17), and Gaia ESO (dr6). The targets are member of young/intermediate age clusters and are in the temperature range 3000-5500 K.
2. Targets that are members of the same clusters as 1. (from Cantat-Gaudin+20), x-matched with Gaia DR3 AP, with Teff < 5800 and logg > 3.8.

We also applied additional cuts to comply with the SNR requirement of BOSS G < 16 mag.

The stars in both the manual_validation_apogee and manual_validation_boss cartons were chosen from the 4MOST, DESI, PSF and WEAVE surveys with the goal of comparing between surveys and establishing a strategy that will put all stellar parameters onto the same scale. There are also stars from Open Cluster, Globular Clusters, low reddening stars, Gaia Benchmark stars, planet hosts, and, for BOSS, APOKASC stars all for calibration purposes.

The list includes the following validation classes: open cluster members observed by 4MOST, Gaia benchmark stars, planet host stars, stars with high quality atmospheric parameters from GES DR3, GALAH DR3 and GALAH-GES common stars.

The list includes members from the following clusters: M92, M55, M13, M5, M107, M67, M35, NGC 6819, NGC 6791, 47 Tuc. Cluster members are selected using Gaia proper motions. The list also includes planet host stars, Gaia benchmark stars, low E(B-V) stars from APOGEE DR17, and APOKASC stars. 

Compilation of stars of spectral type O, B, A, and F that have been studied in literature based on medium- to high-resolution (R>~10 000) spectroscopy. We collect Teff, log g, and vsini parameters from some 15 literature sources and include stars both in the Galaxy and Magellanic Clouds. Our original selection comprises 3599 objects of which 3535 have unique Gaia EDR3 identifiers. Sixty two stars are found to have parameter values reported in multiple literature sources. Two of those 62 targets have parameter measurements reported in three different literature sources, while the remaining 60 stars have their parameters reported in two source.

In the next step, we cross-match our validation sample of 3535 stars with Gaia DR3 and select those objects for which the esphs DR3 Teff and log g parameter measurements exist. This selection returns 1702 stars whose Teff, log g, and vsini distributions are shown with green bars in Figure 1 in the attached PDF. Ultimately, the validation sample of 3535 stars is cross-matched with the MWM ob_core carton stellar sample. Of 775 stars matched, 515 have the Gaia DR3 esphs Teff and logg parameter measurements available and 381 have all three atmospheric parameters – Teff, log g, and vsini – deduced.

The BOSS version of manual_mwm_validation_hot_apogee

This v1 carton is filled with known RV stable stars from Trifonov, et. al 2020 and Butler et al. 2017 and then applying the following selection criteria.

Selection Criteria

• Uses the same photometric quality cuts as mwm_bin_rv_short
• 7 < H < 10.8
• Number of Epochs >= 12
• Temporal baseline >= 2000 days
• Std deviation (RV) <= 10 m/s

This carton’s goal is to obtain BOSS spectra for stars observed by APOGEE to aid in the calibration of BOSS data. The high-quality information from the APOGEE spectra can be used for empirical derivations of stellar parameters from BOSS spectra. This carton uses Gaia DR2 magnitudes to ensure that the stars are not too bright in the optical.

The target selection relies on the Legacy APOGEE “Merge File” table (mos_sdss_apogeeallstarmerge_r13), described in detail under the mwm_rv_long_bplates carton in the Binary program. This table consolidates duplicate entries of the APOGEE allVisit and allStar files from DR16 and is available on the SAS and on CasJobs. The full selection criteria are:

• Target is in APOGEE DR16 “Merge File”
• 13 < G < 18
• G_BP > 13
• G_RP > 13

This carton is the v1 update to mwm_legacy_ir2opt. The updated selection code is below:

• Target is in APOGEE DR17 “Merge File”
• 8 < G < 18

Targets selected from globular and open clusters (according to Hunt & Reffert 2024) observed with the BOSS instrument. These targets were observed with longer a longer integration time during engineering while the LCO APOGEE instrument was under maintenance. High priority prioritizes 1) overlap with APOGEE in globular clusters and 2) faint objects in open clusters

Targets selected from globular and open clusters (according to Hunt & Reffert 2024)  observed with the BOSS instrument. These targets were observed with longer a longer integration time during engineering while the LCO APOGEE instrument was under maintenance. Low priority targets are other cluster members which are not in *_high_priority

These are targets selected from globular and open clusters that have been observed many times over many years with the apogee instrument. The carton can be created from the SDSS DR17 allstarmerge file. This carton has not been observed in DR20.

SQL Selection Query

SELECT apogee_id,ra,dec,nvisits,baseline,j,j_err,h,h_err,k,k_err,fields
FROM catalogdb.sdss_dr17_apogee_allstarmerge WHERE fields LIKE ‘%M15%’
AND baseline >= 1300 AND nvisits >= 12 

These are targets selected from globular and open clusters that have been observed many times over many years with the apogee instrument. The carton can be created from the SDSS DR17 allstarmerge file. This carton has not been observed in DR20.

SQL Selection Query

SELECT apogee_id,ra,dec,nvisits,baseline,j,j_err,h,h_err,k,k_err,fields
FROM catalogdb.sdss_dr17_apogee_allstarmerge WHERE fields LIKE ‘%M15%’
AND baseline < 1300 AND baseline >= 900 AND nvisits >= 12

These are targets selected from globular and open clusters that have been observed many times over many years with the apogee instrument. The carton can be created from the SDSS DR17 allstarmerge file. This carton has not been observed in DR20.

SQL Selection Query

SELECT apogee_id,ra,dec,nvisits,baseline,j,j_err,h,h_err,k,k_err,fields
FROM catalogdb.sdss_dr17_apogee_allstarmerge WHERE fields LIKE ‘%M67%’
AND baseline >= 2000 AND nvisits >= 12

These are targets selected from globular and open clusters that have been observed many times over many years with the apogee instrument. The carton can be created from the SDSS DR17 allstarmerge file. This carton has not been observed in DR20.

SQL Selection Query

SELECT apogee_id,ra,dec,nvisits,baseline,j,j_err,h,h_err,k,k_err,fields
FROM catalogdb.sdss_dr17_apogee_allstarmerge WHERE fields LIKE ‘%M67%’
AND baseline < 2000 AND baseline >= 1300 AND nvisits >= 12

These are targets selected from globular and open clusters that have been observed many times over many years with the apogee instrument. The carton can be created from the SDSS DR17 allstarmerge file. This carton has not been observed in DR20.

SQL Selection Query

SELECT apogee_id,ra,dec,nvisits,baseline,j,j_err,h,h_err,k,k_err,fields
FROM catalogdb.sdss_dr17_apogee_allstarmerge WHERE fields LIKE ‘%N188%’
AND baseline >= 3000 AND nvisits >= 12

These are targets selected from globular and open clusters that have been observed many times over many years with the apogee instrument. The carton can be created from the SDSS DR17 allstarmerge file. This carton has not been observed in DR20.

SQL Selection Query

SELECT apogee_id,ra,dec,nvisits,baseline,j,j_err,h,h_err,k,k_err,fields
FROM catalogdb.sdss_dr17_apogee_allstarmerge WHERE fields LIKE ‘%N188%’
AND baseline < 3000 AND baseline >= 1800 AND nvisits >= 1