HE0557-4840

taken from 2 paper(s):

/J.E.Norris et al.(2007)/ /J.E.Norris et al.(2012)/

J.E.Norris et al.,ApJ, 670, 774, 2007(ADS)

HE 0557-4840: Ultra Metal-Poor and Carbon-Rich


Stellar Parameters

Teff : 4900+-100 log g : 2.2+-0.3 vturb : 1.8+-0.2

Chemical Abundances

Original Data Converted Data Asplund et al. (2009)
Element Nline [X/H] [X/Fe] log-e [X/H] [X/Fe] log-e Element
Li I1......<0.70<-2.56<2.17<0.70Li I
CHN/A...+1.65+-0.105.29+-0.10-3.14+-0.101.59+-0.105.29+-0.10CH
CNN/A...<+2.37+-0.10<5.40+-0.10<-2.43+-0.10<2.30+-0.10<5.40+-0.10CN
NHN/A...<+1.47+-0.20<4.50+-0.20<-3.33+-0.20<1.40+-0.20<4.50+-0.20NH
O I1...<+3.09<7.00<-1.69<3.04<7.00O I
Na I1...-0.161.26-4.98-0.251.26Na I
Mg I5...+0.25+-0.073.03+-0.07-4.57+-0.070.16+-0.073.03+-0.07Mg I
Al I1...-0.611.01-5.44-0.711.01Al I
Ca I1...+0.251.81-4.530.201.81Ca I
Ca II2...+0.622.18-4.160.572.18Ca II
Sc II4...+0.31+-0.11-1.39+-0.11-4.54+-0.110.19+-0.11-1.39+-0.11Sc II
Ti II5...+0.35+-0.100.50+-0.10-4.45+-0.100.28+-0.100.50+-0.10Ti II
Cr I2...-0.700.19-5.45-0.720.19Cr I
Mn I1...<-0.63<0.01<-5.42<-0.69<0.01Mn I
Fe I60-4.75+-0.17...2.77+-0.17-4.73+-0.17...2.77+-0.17Fe I
Fe II2......2.70-4.80...2.70Fe II
Co I2...+0.040.20-4.79-0.060.20Co I
Ni I8...-0.22+-0.101.26+-0.10-4.96+-0.10-0.23+-0.101.26+-0.10Ni I
Y II1...<+0.74<-1.80<-4.01<0.72<-1.80Y II
Zr II1...<+2.27<0.11<-2.47<2.26<0.11Zr II
Ba II1...<+0.03<-2.55<-4.73<0.00<-2.55Ba II
Eu II1...<+2.04<-2.19<-2.71<2.02<-2.19Eu II

Binary Parameters

Vrad 211.44

Position

Right Ascension : 05 58 39.26 Declination : -48 39 56.8 Galactic Longitude (l) : N/A Galactic Latitude (b) : N/A

Observing Log

Date of Observation JD Facility Resolution S/N Exposure Time Vrad
2453771.029 VLT 40000 200 3600 211.44
2453771.072 VLT 40000 200 3600 211.67
2453771.159 VLT 40000 200 3600 211.61
2453791.025 VLT 40000 200 3600 211.98
2453792.035 VLT 40000 200 3600 211.90
2453792.078 VLT 40000 200 3600 212.02
2453813.999 VLT 40000 200 3600 211.84

J.E.Norris et al.,ApJ, 753, 150, 2012(ADS)

The Oxygen Abundance of the Ultra-metal-poor Star HE 0557-4840


Stellar Parameters

Teff : 4900 log g : 2.2 vturb : 1.8

Chemical Abundances

Original Data Converted Data Asplund et al. (2009)
Element Nline [X/H] [X/Fe] log-e [X/H] [X/Fe] log-e Element
CN/A...1.7+-0.15.4+-0.1-3.03+-0.11.76+-0.15.4+-0.1C
NN/A...<1.0+-0.2<4.0+-0.2<-3.83+-0.2<0.96+-0.2<4.0+-0.2N
ON/A...2.3+-0.36.2+-0.3-2.49+-0.32.30+-0.36.2+-0.3O
Fe IN/A......2.71+-0.03-4.79+-0.03...2.71+-0.03Fe I
Fe IIN/A......2.87+-0.11-4.63+-0.11...2.87+-0.11Fe II

Binary Parameters

Binarity Negative
Vrad 212.0+-0.4

Position

Right Ascension : 05 58 39.26 Declination : -48 39 56.8 Galactic Longitude (l) : N/A Galactic Latitude (b) : N/A

Observing Log

Date of Observation JD Facility Resolution S/N Exposure Time Vrad
2007-10-15 N/A VLT 40000 N/A N/A 212.0+-0.4
2007-12-05 N/A VLT 40000 N/A N/A 212.0+-0.4
2007-12-06 N/A VLT 40000 N/A N/A 212.0+-0.4