rosaria (sara) bonito dipartimento di fisica e chimica universita ' degli studi di palermo
DESCRIPTION
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. - PowerPoint PPT PresentationTRANSCRIPT
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Rosaria (Sara) Bonito
Dipartimento di Fisica e ChimicaUniversita' degli Studi di Palermo
INAF-Osservatorio Astronomico di Palermo
THE PROBLEMS OF SKY SUBTRACTION
AND OF ANOMALOUS MEMBERS IN YOUNG CLUSTERS:
THE CASE OF NGC 6611
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FLAMES observations (HR15N setup)
NGC 6611: forthcoming observations
GES
NGC 6611 & GES
(Bonito et al. 2013)
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Nebular contribution to Ha emission Strongly varying in space and time Narrower than stellar
FWZI method (as EW and Ha10% cannot be derived)
SKY SUBTRACTION & Ha
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FWZI METHOD (1) Zoom +/- 3 A around Ha in sky spectra
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FWZI METHOD (2) Normalize: spectrum without the emission line
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FWZI METHOD (3) Difference or ratio original
spectrum/spectrum without the emission line
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FWZI(Ha) skyFWZI METHOD (4)
< 3 A
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FWZI(Ha) star >> FWZI(Ha) sky
FWZI(Halpha) & ACCRETION (Bonito et al. 2013)
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Upper limit for EW(Li) using other features in the Li spectral region (Randich et al. 2009)
Median sky subtraction (Jeffries & Oliveira 2005)
SKY SUBTRACTION AND Li (1)
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Spurious absorption lines due to [SII] 6717 A
SKY SUBTRACTION AND Li (1)
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SKY SUBTRACTION AND Li (2)
No Li No veiling
Age Membership
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NGC 6611: forthcoming observations g Vel NGC 2264 NGC 6530
IMPLICATION FOR GES
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BWE STARS IN NGC 6611 (Bonito et al. 2013)
+: members from the Guarcello et al. (2010) catalog
: all the targets observed with FLAMES
: BWE stars (with disk)
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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
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CONCLUSIONS Sky subtraction FWZI(Ha) method Spurious absorption lines (Li)
Blue with excesses (BWE) stars completeness age spread other clusters (GES)