Ages of Red Giants in the Kepler and CoRoT Fields
Summary
Sample of stars with asteroseismic data to facilitate determination of parameters, including ages.
Finding Targets
An object whose APOGEE_TARGET1 value includes one or more of the bitmasks in the following table was targeted for spectroscopy as part of this ancillary target program. See SDSS bitmasks to learn how to use these values to identify objects in this ancillary target program. See the description of the Kepler field targeting on the APOGEE-1 targeting page for a fuller discussion of the flags under this general science category.
| APOGEE_TARGET1 bit name | Bit | Target Description |
|---|---|---|
| APOGEE_DISK_RED_GIANT | 22 | asteroseismic target in Kepler or CoRoT sample |
| APOGEE_KEPLER_SEISMO | 27 | asteroseismic target in Kepler sample |
Description
APOGEE observed red giants in the Kepler field and two fields observed by the CoRoT satellite (Baglin et al. 2006). These fields lie on opposite sides of the Galaxy, with COROTA at (l,b) ~ (212°, -2°) and COROTC at (l,b) ~ (38°, -8°). Because CoRoT stars probe the disk at a range of Galactocentric radii, they complement the Kepler sample stars, most of which lie near the solar circle. As with the Kepler sample, the seismic information available for the CoRoT stars permits the determination of fundamental stellar parameters, including age. Note that only the CoRoT red giants and a limited number of Kepler red giants have bit 22 set. Many of the rest are flagged using bit 27 in APOGEE_TARGET1, which also includes about 500 dwarfs and subgiants with seismic detections.
Primary contact
| Marc Pinsonneault |
|---|
| The Ohio State University |
Other contacts
Jamie Tayar, Jennifer Johnson, Cristina Chiappini, Friedrich Anders
Target Selection Details
The CoRoT set of RG stars with seismic detections was selected from the sample analyzed in Mosser et al. (2010). Approximately 120 stars were targeted in the COROTA field, and approximately 360 in COROTC. For details on the Kepler targeting, see Pinsonneault et al. (2014).
References
Baglin, A., et al. 2006, in 36th COSPAR Scientific Assembly, Vol. 36, 3749
Mosser, B. et al. 2010, A&A, 517, 22
Pinsonneault, M. et al. 2014, ApJS, 215, 19
