WG 13 OBA spectrum analysis - arcetri.astro.it · •Giraffe hot-star gratings • (UVES 520) Gratings Arcetri, 12-13 November 2013 The Gaia-ESO Survey: Consolidating the Survey Strategy

WG 13 OBA spectrum analysis

Ronny Blomme Royal Observatory of Belgium

On behalf of: Y. Frémat, M. Gebran, A. Lobel, J. Maíz Apellániz, R. Monier, T. Morel, I. Negueruela, F. Royer, T. Semaan, S. Simón-Díaz and the Gaia-ESO WG13 team

• Giraffe hot-star gratings

• (UVES 520)

Gratings

Arcetri, 12-13 November 2013 The Gaia-ESO Survey: Consolidating the Survey Strategy

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Grating Wavelength range

HR03 4033-4201 HR05A 4340-4587 HR06 4538-4759

HR09B 5143-5356 HR14A 6308-6701

Open clusters processed:

Clusters


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Cluster Age Distance (kpc)

Galactocentric distance (kpc)

Berkeley 81 1 Gyr 3 5.8 NGC 4815 0.5 Gyr 2.5 6.9 NGC 6705 250-300 Myr 1.9 6.1 NGC 3293 10 Myr 2.3 7.7 Trumpler 14 1-3 Myr 2.3 7.6

o ROB_Grid: o ROB (A. Lobel):

• Kurucz, LTE spectrum synthesis, A-stars o Liège (T. Morel, T. Semaan):

• Kurucz (LTE) or Tlusty (NLTE), NLTE spectrum synthesis, B-stars

Nodes


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Grid Teff range Bertone et al. 2004 4,000 – 50,000 K Munari et al. 2005 – new ODF 3,500 – 9,750 K Munari et al. 2005 – old ODF 3,500 – 47,500 K Pollux - Atlas 7,000 – 15,000 K Tlusty B2006 15,000 – 30,000 K Tlusty O2002 27,500 – 55,000 K

Trumpler 14


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Not all grids cover full Teff range

Reject results at boundary of each grid

Bertone grid: problems around 20,000-25,000 K

Trumpler 14


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Plot other vs best result

Good agreement No ROB/Liège results

Trumpler 14


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Other log g vs best one

Only results with a “valid” Teff

Dashed lines: +- 0.5 dex

Trumpler 14


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Other [M/H] vs best Only vaild Teff Dashed lines at +-0.5

dex

NGC 3293


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NGC 3293 Other Teff vs best one Only results with a

“valid” Teff ROB and Liège results

plotted ROB results differ?

NGC 3293


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Zoom-in of previous fig ROB + some Liège results differ Note the 8,000-10,000 K gap

NGC 3293


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Other log g vs best one ROB log g values differ But they are more consistent

with expectations

NGC 3293


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Other [M/H] vs best one ROB values differ But they are more consistent

with expectations

NGC 6705


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NGC 6705 Other Teff vs best one

NGC 6705


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Zoom-in of previous fig ROB results, no Liège results ROB results differ 8,000-10,000 gap

NGC 6705


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Other log g vs best one ROB values differ But they are more consistent

with expectations

NGC 6705


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Other [M/H] vs best one ROB values differ But they are more consistent

with expectations

o Why the ROB vs ROB_grid differences? o ROB determines microturbulence, ROB_grid uses fixed value o ROB determines [Fe/H], ROB_grid [M/H] o ROB does the normalization of the spectrum again, ROB_grid

just applies a minor correction to the normalization

ROB vs ROB_grid


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Fig.: Y. Frémat

Summary

Substantial progress has been made since iDR1, in quality of spectral fitting

Differences between ROB and ROB_grid are worrying Most probably cause is the normalization This is to be explored in the coming weeks

Summary


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Documents

WG 13 OBA spectrum analysis - arcetri.astro.it · •Giraffe hot-star gratings • (UVES 520) Gratings Arcetri, 12-13 November 2013 The Gaia-ESO Survey: Consolidating the Survey Strategy