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Rosaria (Sara) Bonito Dipartimento di Fisica e Chimica Universita ' degli Studi di Palermo

THE PROBLEMS OF SKY SUBTRACTION AND OF ANOMALOUS MEMBERS IN YOUNG CLUSTERS: THE CASE OF NGC 6611. Rosaria (Sara) Bonito Dipartimento di Fisica e Chimica Universita ' degli Studi di Palermo INAF- Osservatorio Astronomico di Palermo. NGC 6611 & GES.

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Rosaria (Sara) Bonito Dipartimento di Fisica e Chimica Universita ' degli Studi di Palermo

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  1. THE PROBLEMS OF SKY SUBTRACTION AND OF ANOMALOUS MEMBERS IN YOUNG CLUSTERS: THE CASE OF NGC 6611 Rosaria (Sara) Bonito DipartimentodiFisicaeChimica Universita' degliStudidi Palermo INAF-OsservatorioAstronomicodi Palermo

  2. NGC 6611 & GES • FLAMES observations (HR15N setup) • NGC 6611: forthcoming observations • GES (Bonito et al. 2013)

  3. SKY SUBTRACTION & Ha • Nebular contribution to Ha emission • Strongly varying in space and time • Narrower than stellar • FWZI method • (as EW and Ha10% cannot be derived)

  4. FWZI METHOD (1) • Zoom +/- 3 A around Hain sky spectra

  5. FWZI METHOD (2) • Normalize: spectrum without the emission line

  6. FWZI METHOD (3) • Difference orratiooriginal • spectrum/spectrumwithout the emissionline

  7. FWZI METHOD (4) • FWZI(Ha) sky < 3 A

  8. FWZI(Halpha) & ACCRETION • FWZI(Ha) star >> FWZI(Ha) sky • (Bonito et al. 2013)

  9. SKY SUBTRACTION AND Li (1) • Upper limit for EW(Li) using other features • in the Li spectral region (Randich et al. 2009) • Median sky subtraction (Jeffries & Oliveira 2005)

  10. SKY SUBTRACTION AND Li (1) • Spurious absorption lines due to [SII] 6717 A

  11. SKY SUBTRACTION AND Li (2) • No Li • No veiling • Age • Membership

  12. IMPLICATION FOR GES • NGC 6611: forthcoming observations • gVel • NGC 2264 • NGC 6530

  13. (Bonito et al. 2013) BWE STARS IN NGC 6611 +: members from the Guarcello et al. (2010)catalog : all the targetsobservedwith FLAMES : BWE stars (with disk)

  14. BWE STARS: WHY? • > 50 %: members • (Bonito et al. 2013) • old members? • (De Marchi, Panagia, Guarcello, Bonito et al. 2013) • also in other clusters • completeness • age spread? • GES

  15. CONCLUSIONS • Sky subtraction • FWZI(Ha) method • Spurious absorption lines (Li) • Blue with excesses (BWE) stars • completeness • age spread • other clusters (GES)

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