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LAS & GCS SV2 reports

This report details the findings from the UKIDSS SV meeting held in Edinburgh on December 15, 2005. It presents photometric analyses of known L/T dwarfs using WFCAM data featuring diagrams and color-color plots. The report addresses completeness limits and errors in magnitude measurements for the cluster IC4665. The findings highlight concerns regarding photometry reliability when stars are closely packed and suggest enhancements for data output and object input in WSA. Detailed CMDs and finding charts are included for Coma Ber and Upper Sco.

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LAS & GCS SV2 reports

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  1. LAS & GCS SV2 reports Nicolas Lodieu “UKIDSS SV meeting”, Edinburgh, 15 December 2005

  2. LAS report

  3. Photometry of known L/T dwarfs

  4. LAS diagrams (1) WFCAM tile @ RA=10h46 dec=04°24' No constrainton the Class Separation Stars & Galaxies

  5. LAS diagrams (2) (J-H,Y-J) diagram (J-K,Y-J) diagram

  6. LAS vs SDSS WFCAM tile @ RA=10h46 dec=04°24' WFCAM tile @ RA=09h40 dec=45° (J-K,z-J) diagram (J-K,z-J) diagram

  7. Finding charts

  8. GCS report

  9. IC4665: completeness limits

  10. IC4665: errors on the magnitudes Y Z 0.1 mag @ Y=19.0 0.1 mag @ Z=19.0 J H 0.1 mag @ J=18.5 0.1 mag @ H=18.0 K J zoom 0.1 mag @ K=17.0

  11. IC4665: CMD (1) (Y-J,Y) CMD from SV1

  12. IC4665: CMD (2) (Y-J,Y) CMD from SV2

  13. IC4665: Finding charts

  14. Coma Ber: (Y-J,Y) CMD

  15. Coma Ber: Finding charts

  16. Upper Sco: (Z-J,Z) CMD

  17. IC4665: colour-colour diagram

  18. Conclusions 1) Pipeline Main concern: photometry in LAS and GCS 1) Pipeline seems to detect objects with nothing at their nominal positions 2) Photometry seems unreliable when two stars are close to each other 2) Suggestions for WSA 1) Coordinates in sexagesimal format when an image is output (currently only coordinates in degrees are output) 2) Possibility to input a list of objects to get their UKIDSS photometry

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