SPECTRAL CLASSIFICATIONA Stellar Spectral Flux Library, 1150 25000 A (A.J. Pickles, PASP 110, 863,...
Transcript of SPECTRAL CLASSIFICATIONA Stellar Spectral Flux Library, 1150 25000 A (A.J. Pickles, PASP 110, 863,...
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SPECTRAL CLASSIFICATION
The standard correlations withspectral class
http://www.shef.ac.uk/physics/people/pacrowther/spectral_classification.html
Tem
pera
ture
effe
cts
are
obvi
ous
http://nedwww.ipac.caltech.edu/level5/ASS_Atlas/MK_contents.html
Lum
inoi
sty
effe
cts
are
subt
le
Spe
ctra
l pec
ular
ities
Spe
ctra
l pec
ular
ities
Var
iabl
e st
ars
Abu
ndan
ce e
ffect
s in
coo
l sta
rs
Electronic low-res spectral library
http://www.ifa.hawaii.edu/users/pickles/AJP/hilib.html
Broad-band photometry and temperatures:dwarf stars (V:)
Meléndez, J.; Ramírez, I. 2005, ApJ, 626, 465
Dwarf stars (V:)
Giant stars (III:)
Giant stars (III:)
Photometricsystemsresource
http
://ob
sww
w.u
nige
.ch/
gcpd
/gcp
d.ht
ml
Blue stragglers inglobular clusters
NGC 288(Kaluzny 1996)
Common distancemakes identificationeasy
MS
RGB
BHB
RHBAGB
MS turnoff
Identifying field BMP stars:Galactic disk star color-color relation
Empirical relations:
Hot edge of metal-poormain sequence
[Fe/H] ~ -1
[Fe/H] ~ 0
Preston et al. 1994
Points are the B8-F0stars from the BrightStar Catalog
Identifying field BMP stars:stars from the HK halo-star survey
Preston et al. 1994
Pop I MS
BMP st
ars
Also thedomain ofPop II HBstars ofsimilar B-V
“HK” Survey: Beers et al. 1985, 1992