1 m – APOGEE Feed Jon Holtzman Diane Feuillet (NMSU)
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Transcript of 1 m – APOGEE Feed Jon Holtzman Diane Feuillet (NMSU)
• Construction and implementation of fiber feed from NMSU 1m to SDSS APOGEE funded by SDSS-III project and, especially, time of Nick MacDonald
• Builds off existing instrument at NA2 port on 1m, which has a pickoff mirror and camera for acquisition and guiding; note no image derotator at NA2
NMSU 1m has been used primarily in robotic mode for imaging
• Fiber installed in the fall• Software developed for control of APOGEE from 1m
control system• Initial test on handful of nights
– Initial implementation of robotic observing for bright stars, 50+ stars per night seems plausible
– Telescope performance (pointing stability) poorer than expected, investigation in progress
– Throughput seems poorer than expected
• Only crude data reduction so far– Sky subtraction and, especially, telluric correction TBD
Work to date
Status
• While we hope for improved performance, even with current performance, bright star program is probably feasible
• Original commitment was to give 3 nights/month to SDSS in exchange for implementation and use of instrument• NMSU potentially interested in using
significantly more , if robotic observing is feasible (but still would consider as collaboration data)
• In context of SDSS-IV, allows additional use of a northern spectrograph
• As initially suggested by Leo Girardi, nearby sample of giants with known distances– Homogeneous sample with APOGEE – Estimate ages– Calibration of APOGEE– Test stellar evolution models
• Bright calibrators, stars of special interest (e.g. s-process rich stars)
• Bright asteroseismology stars• Planet hosts• As capability is demonstrated, we will solicit additional proposals
– RV followup for fainter stars?
Project(s)