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APOGEE Publications and Results


Cross-Calibration of APOGEE Targets

As described in the APOGEE target selection page, APOGEE has observed a significant number of "calibration" stars. It is possible that other surveys may wish to observe the same stars when possible, so we release this list of stars here.

This compressed FITS file contains a subset of stars that APOGEE has started observing. These are located in fields with well-studied open and globular clusters, bulge fields, and equatorial fields. Almost all the stars were observed in Year 1 of APOGEE, and so their spectra (co-added with all observations through July 2012) will be released in Data Release 10 (DR10) in July 2013. The exceptions are the stars with the flag COROT_STD and Right Ascension near 19:25h. That field's data will be released later because it was observed in Year 2.

A subset of these stars meeting S/N and other quality requirements will also have their stellar parameters, as determined by the APOGEE pipeline, released in DR10. We cannot guarantee that every star in this list will eventually have high quality stellar parameters and/or abundances from APOGEE. For instance, while APOGEE has started observations of all the listed stars, the fainter stars are scheduled for additional visits and therefore may not achieve the necessary signal before the end of the survey (depending on variables such as weather), which means their parameters may not be well-determined even in future data releases. Furthermore, APOGEE currently has only approximate parameters for the hot telluric standards.

The FITS table APOGEE_CrossCalib.fits.gz has six columns:

Columns of APOGEE_CrossCalib.fits
1TMASS_ID2MASS ID for the object
2RAright ascension of object (J2000) in decimal degrees
3DECdeclination of object (J2000) in decimal degrees
4PARAM_ABUND_STDsee flag descriptions below
5CLUSTER_MEMBERsee flag descriptions below
6COROT_STDsee flag descriptions below

The objects may have zero or more flags set:

no flags set
Most are red stars selected on J-K0 color. Some are blue stars for telluric correction.
High-resolution analysis is available in the literature, usually because the star is a cluster member.
Star was identified as a cluster member by proper motion or radial velocity, or explicitly included as a confirmed non-member for calibration purposes.
Star is in CoRoT field.

DR10 in July 2013 will contain much more information on these targets. However, because other surveys are currently observing or planning their observation strategies, we wanted to release more quickly a list of stars for which APOGEE is already collecting data.

Please contact Jennifer Johnson (jaj -at- if you have any questions.

APOGEE Science Papers

Title First Author Journal
Very Metal-poor Stars in the Outer Galactic Bulge Found by the APOGEE Survey A. E. García Pérez 2013ApJ...767L...9G
Chemical Abundances in Field Red Giants from High-resolution H-band Spectra Using the APOGEE Spectral Linelist V. V. Smith 2013ApJ...765...16S
The Milky Way's Circular-velocity Curve between 4 and 14 kpc from APOGEE data J. Bovy 2012ApJ...759..131B
New ATLAS9 and MARCS Model Atmosphere Grids for the Apache Point Observatory Galactic Evolution Experiment (APOGEE) S. Mészáros 2012AJ....144..120M
The Apache Point Observatory Galactic Evolution Experiment: First Detection of High-velocity Milky Way Bar Stars D. L. Nidever 2012ApJ...755L..25N