Anticenter fields :

1
Anti-center fields Ground-based
observations - status
2
Spectral classification procedure from B V R i
I J H K photometric observations 1) dwarf/giant
separation
Giants
Dwarfs
3
Contamination
window
Star neighbors
Updated
Flux from Star
Flux from neighbors

• Contamination is defined as the of the flux
  within the stars mask due to the stars
  neighbors up to mag. 20
• The true exoplanet channel PSF is taken into
  account
• If lt 1 contamination is weak,
  
• If gt 10 contamination is strong,
  
• between 1 .. 10 contamination is moderate

4
Anticenter HD 49434 HD 49933
Definition target a star with a contamination
10 Target dwarf a dwarf with a contamination
10
Dwarfs 75 to 81 Targets 60 to 72
5
target a star with a contamination 10 Target
dwarf a dwarf with a contamination 10
Typical field ? 100 a 102 -2.0 d 1.0
Typical field ? 100 a 102 -2.0 d
1.0 R lt 14 targets 3261 with 2489
dwarfs 14Rlt15 targets 3057 with 2422
dwarfs 15Rlt16 targets 4837 with 3829
dwarfs Total 6318 targets with 4911
dwarfs R lt 15 11 155 targets
with 8740 dwarfs R lt 16
6
Center fields Ground-based observations -
status
HD171834
HD170580
HD175726
HD181555
HD177552
a increasing !
HD174866
7
HD 181555
of stars with a contamination 10
target of dwarfs
Dwarfs 45 to 60 Stars with contamination
10 30 to 50
8
291.9 a 293.3 -2.0 d 1.0 CCDE1
11 216 stars and 4 812 with conta.
10 6929 dwarfs and 2 668 with
conta. 10 CCDE2 11 240 stars and
4 951 with conta. 10 5 948 dwarfs
and 2269 with conta. 10 Total 9763
targets with 4937 dwarfs
290.9 a 292.3 -1.2 d 1.8 CCDE1
14 356 stars and 4 892 with conta.
10 8 457 dwarfs and 2 408 with conta.
10 CCDE2 11 187 stars and 4 847 with
conta. 10 4 906 dwarfs and 1 739 with
conta. 10 Total 9739 targets with 4147
dwarfs
9
target a star with a contamination 10 Target
dwarf a dwarf with a contamination 10
Typical field ? south R lt 14 targets
3316 with 1238 dwarfs 14Rlt15 targets
3050 with 1332 dwarfs 15Rlt16 targets
3316 with 1744 dwarfs Total 9682 targets
with 4314 dwarfs
10
HD 171834
32 44 35 51 26
60 55 44 42 51 25
58 79 53 45 44
31 50 71 44 40 40
32 43 61 38 28 36
35 40
of stars with a contamination 10
target of dwarfs
Dwarfs 40 to 53 Stars with
contamination 10 40 to 70
11
HD 171834
Dwarfs 40 to 53 Stars with
contamination 10 40 to 70
280.8 a 282.8 5.7 d 8.7 15
583 with Rlt16 Total 8550 targets with
3473 dwarfs
12
HD 170580
Warning! Contamination should be updated and the
spectral classification should be done on the
whole region.
Dwarfs 40 to 50 Stars with
contamination 10 40 to 64
278.4 a 280.2 2.2 d 5.2 13
261 with Rlt16 Total 7150 targets 3200
dwarfs (45)
13
2 CCD
14
Multi-fibers spectroscopic observations

• Goal characterize at best the stellar
  population (preparatory observations
• ? prepare an 'unbiased' statistical analysis of
  the parent stars
• physical parameters
• Teff , logg, sini, logFe/H, chromospheric
  activity
• identify binaries SB1..
• ? Help to prepare the follow-up observations
  (vsini for radial velocity measurements.. .)

• Observations GIRAFFE (MEDUSE)
• FOV 30' 131 fibers and 7 fibers UVES
• Selection mv lt 15 mainly
• Exposure time 30mn 10 mn overhead
• 2 spectral windows R 27 000
• 1 pointing 1h 10 40 S/N 60
• 1 CCD 9 pointings 10.5h - 3 nights for
  a field .
• Advantage homogeneous sample