SLIDE 1
- Age, [Fe/H]Known
- Age, [Fe/H]KnownResolved
- Unresolved
- SSP
- Age, [Fe/H]SSP
- Age, [Fe/H]UnknownUnresolved
- 2020
- Age, [Fe/H]
Resolve :
Infrared spectral indices to understand unresolved stellar clusters - - PowerPoint PPT Presentation
Infrared spectral indices to understand unresolved stellar clusters - - PowerPoint PPT Presentation
Infrared spectral indices to understand unresolved stellar clusters and galaxies Age, [Fe/H] Known
SLIDE 2
SLIDE 3
2020
- Resolved
- Unresolved
- r
- Cassisi&Salaris,Old Stellar Populations,P.7
SLIDE 4
Unresolved AGE[Fe/H]
- 22
- age-metallicity degeneracy
- AGE[Fe/H]SSP
SPP AGE[Fe/H]
- -> lick index
SLIDE 5
2AGE-Metallicity disentangling
# [Fe/H] ↑ AGE ↑ Cassisi&Salaris,Old Stellar Populations,9
SLIDE 6
AGE[Fe/H] M/LMASS
Cassisi&Salaris Old Stellar Populations, P.445 KM/L[Fe/H]
- ↓
/
SLIDE 7
Unresolved AGE[Fe/H]
- 22
- age-metallicity degeneracy
- AGE[Fe/H]SSP
SPP AGE[Fe/H]
- -> lick index
SLIDE 8
UnresolvedAGEZ SSP
- φ(M): IMF
- fstar:
- mlo: 0.08 or 0.1Msun
- hydrogen burning limit
- mup(t):
- dictated by stellar evolution
- fSSP(t,Z): time and metallicity
dependent simple stellar population (SSP) model cf. CSP = Composite Stellar Population
SLIDE 9
Lick indexAGE[Fe/H]
- MILES SSP
Model
- Salpeter IMF
- Padova
Isochlone
2
- EW
RochesterRussel Smith 2.5Gyr, [Fe/H] = -0.0 10Gyr, [Fe/H] = -0.4 /
SLIDE 10
Lick index
- Hβ
- Fe5335
AGE[Fe/H]
- Schiavon, 2007, ApJS, 2007, 171, 146
SLIDE 11
Lick index
- Cassisi&Salaris,Old Stellar Populations,9
SLIDE 12
- BHB, BS
- Blue-HB stars
- Blue stragglers
Piotto+ 2002 Schiavon+ 2004b Schiavon+ 2004a BHBGC RHBGC mostly RHBGC intermediateGC BHB
SLIDE 13
- UnresolvedAGE[Fe/H]
- EWSSP
- Lick index
- BS/BHBBSBHBisoclone
- SSPSSP
- M/LMASS
- 2020/
- BS/BHB↓
- SSPTP-AGB
SLIDE 14
SSP
- isoclone (TP-AGB)
- CMD i
- (m, L, Teff, [Fe/H], Y)_i (Teff, g, [Fe/H], Y)_i
- g m,L,Teff
- LTeff i flux density//
- (Teff, g, [Fe/H], Y)
- SSP
- AGE[Fe/H]/SSP
SLIDE 15
SSP (1)
- (R~7000)
- Age,[Fe/H]Known(
)Unresolved
- Age,[Fe/H]
SSP
Usher+ 2017
WAGGS 3300-9050A, R=6800
- LF
SSP
SLIDE 16
SSP (2)
- Age,[Fe/H]
(Upper RGB, TP-AGB)
AGE[Fe/H]Y
- Anderson+ 2010
Omega Cen
SLIDE 17
- Salaris&Cassisi
Evolution of stars and stellar populsations,P.332 1GyrTP-AGB 10GyrRGB
SLIDE 18
index
SLIDE 19
- UnresolvedWFIRST, TMT,
ULTIMATE,SWIMSSSP AGE, [Fe/H], (& MASS)
- M31
- TMT
- M31Resolve
- Virgo, Coma
SLIDE 20
- Age, [Fe/H]KnownResolved
- Unresolved
- SSP
- Age, [Fe/H]SSP
- Age, [Fe/H]UnknownUnresolved
- 2020
- Age, [Fe/H]
SLIDE 21
Appendix
SLIDE 22
Y
- [M/H],Y
↑ age,Y [M/H]↑ age,[M/H] Y↑ Cassisi&Salaris,Old Stellar Populations,3
- Turn offage,[M/H],Y↑
SLIDE 23
- Greggio&Renzini
Stellar Populations 6
SLIDE 24
- : MW, : SMC, : LMC
SMC2Intermediate ageLMC Inter-mediate age Fornax
SLIDE 25
index
- Meneses-Goytia+ 2015
- IRTF spectral library
- R~2000
SLIDE 26
SLIDE 27
SSPM/L
- ~12Gyr(GC)
- resolve/
- Cassisi&Salaris,Old Stellar Populations,P.448
SLIDE 28
- Greggio&Renzini
Stellar Populations, P.78 1990HSTHipparcos
- Turn off
SLIDE 29
Post-GAIA
- GAIA
- 1kpc,1%5kpc,5%
- (Known)
1kpc 5kpc
- ~160
15
- 520?
234 516 GAIA1%
- http://gclusters.altervista.org/table1a.php?sel=R_sun
- https://webda.physics.muni.cz/cocd.html
SLIDE 30
IMF IMFSalpeter
- IMF
SLIDE 31
Binary
- Y
- PrimaryIMF
- M1 M2
- orbital separation
- orbital eccentricity
- common envelope ejection efficiency
- mass loss efficiency
- efficiency of the tidally enhanced mass loss