J/AJ/139/1051 Carbon-enhanced metal-poor stars in the Galaxy (Placco+, 2010)
A search for unrecognized carbon-enhanced metal-poor stars in the Galaxy.
Placco V.M., Kennedy C.R., Rossi S., Beers T.C., Lee Y.S., Christlieb N.,
Sivarani T., Reimers D., Wisotzki L.
<Astron. J., 139, 1051-1065 (2010)>
=2010AJ....139.1051P 2010AJ....139.1051P
ADC_Keywords: Stars, carbon ; Stars, population II; Stars, metal-deficient;
Abundances
Keywords: Galaxy: halo - stars: abundances - stars: carbon -
stars: Population II - surveys - techniques: spectroscopic
Abstract:
We have developed a new procedure to search for carbon-enhanced
metal-poor (CEMP) stars from the Hamburg/ESO (HES) prism-survey
plates. This method employs an extended line index for the CH G band,
which we demonstrate to have superior performance when compared to the
narrower G-band index formerly employed to estimate G-band strengths
for these spectra.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3.dat 62 132 Stellar data for the observed candidates
table4.dat 52 132 Atmospheric parameters and carbon abundance
estimates for the observed candidates
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See also:
J/AJ/128/2402 : Extremely metal-poor star candidates abundances (Lai+, 2004)
J/ApJS/155/651 : Evolution of extremely metal-poor stars (Herwig+, 2004)
J/A+A/490/769 : Yields from extremely metal-poor stars (Campbell+, 2008)
J/A+A/501/519 : Extremely metal-poor turnoff stars abund. (Bonifacio+, 2009)
J/AJ/132/137 : Abundances of extremely metal-poor carbon stars (Cohen+ 2006)
J/MNRAS/412/843 : SAGA extremely metal-poor stars (Suda+, 2011)
Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 2 A2 --- --- [HE]
4- 12 A9 --- HE Star name in Hamburg/ESO survey (HHMM-DDMM)
14- 15 I2 h RAh Right ascension (J2000)
17- 18 I2 min RAm Right ascension (J2000)
20- 23 F4.1 s RAs Right ascension (J2000)
25 A1 --- DE- Declination sign (J2000)
26- 27 I2 deg DEd Declination (J2000)
29- 30 I2 arcmin DEm Declination (J2000)
32- 33 I2 arcsec DEs Declination (J2000)
35- 38 F4.1 mag BHES HES B magnitude (from Hamburg/ESO plates)
40- 43 F4.2 mag (J-K)0 Deredenned J-K colour index
45- 48 F4.1 0.1nm GPE GP index, 15Å wide G-band index (1)
50- 52 F3.1 0.1nm KPHES KP index (CaII line)
54- 57 F4.1 0.1nm GPHES GPHES index, 26Å G-band index (2)
59- 62 A4 --- Tag Remarks and notes (3)
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Note (1): This index is a pseudo-equivalent width that measures the
contrast between the observed spectra and the continuum level.
Note (2): G-band index for use with the scanned HES spectra, GPHES, of
width 26 Å calibrated to be on a similar scale as the GP index.
Note (3): Tag as follows:
mpca = Absent CaII K line
mpcb = Weak CaII K line
mpcc = Strong CaII K line
unid = CaII K line not found
fhlc = Faint high-latitude carbon stars
habs = Strong absorption H lines
hbab = Horizontal-branch/A type star
nois = Low S/N
ovl = Overlapping spectra
art = Artifacts on photographic plates
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 2 A2 --- --- [HE]
4- 12 A9 --- HE Star name in Hamburg/ESO survey (HHMM-DDMM)
14- 19 F6.1 km/s RV Radial velocity
21- 24 F4.1 km/s e_RV rms uncertainty on RV
26- 29 I4 K Teff Effective temperature
31- 34 F4.2 [cm/s+2] logg Surface gravity
36- 40 F5.2 [-] [Fe/H] Metallicity
42 A1 --- l_[C/Fe] Limit flag on [C/Fe] (upper limit)
43- 47 F5.2 [-] [C/Fe] ? Abundance, [C/Fe]
49- 52 F4.2 [-] e_[C/Fe] ? rms uncertainty on [C/Fe]
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 16-May-2012