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J/ApJ/655/492       Equivalent widths of 26 metal-poor stars      (Aoki+, 2007)

Carbon-enhanced metal-poor stars. I. Chemical compositions of 26 stars. Aoki W., Beers T.C., Christlieb N., Norris J.E., Ryan S.G., Tsangarides S. <Astrophys. J., 655, 492-521 (2007)> =2007ApJ...655..492A
ADC_Keywords: Stars, metal-deficient ; Spectroscopy ; Photometry Keywords: nuclear reactions, nucleosynthesis, abundances - stars: abundances - stars: AGB and post-AGB - stars: carbon -stars: Population II Abstract: The chemical compositions of 26 metal-poor stars that exhibit strong CH and/or C2 molecular bands are determined. Twenty-two stars in our sample satisfy our definition for carbon-enhanced metal-poor (CEMP) stars based on the carbon abundance ratio ([C/Fe]) and the evolutionary status. In addition, we measure Na abundances for nine known carbon-enhanced stars. Combining our new sample with the results of previous work, we investigate the abundance and evolutionary status of a total of 64 CEMP stars. Description: High-resolution spectroscopic observations for the stars in our sample were obtained with Subaru HDS, with a spectral resolving power R=50000 (a slit width of 0.72"), in 2002 October and 2003 May. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 93 26 Object list and observing log table2.dat 79 26 Photometric Data ew.dat 43 3954 Equivalent widths (tables 5-7 of the paper)
See also: J/A+A/404/187 : Equivalent widths for metal-poor stars (Gratton+, 2003) J/A+A/425/671 : Equivalent widths of 10 metal-poor halo stars (Bai+, 2004) J/A+A/440/321 : Chemical abundances in 43 metal-poor stars (Jonsell+, 2005) J/AJ/130/2804 : Carbon abundances in metal-poor stars (Rossi+, 2005) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 2 I2 --- Seq Sequential number 4- 15 A12 --- Name Star name 16 A1 --- n_Name [b] Note on CS 29497-034 (1) 18- 19 I2 h RAh Right ascension (J2000.0) 21- 22 I2 min RAm Right ascension (J2000.0) 24- 27 F4.1 s RAs Right ascension (J2000.0) 29 A1 --- DE- Declination sign (J2000.0) 30- 31 I2 deg DEd Declination (J2000.0) 33- 34 I2 arcmin DEm Declination (J2000.0) 36- 37 I2 arcsec DEs Declination (J2000.0) 39- 42 I4 s ExpTime Exposure time 44- 48 I5 ct Count Counts in 5200Å 50- 59 A10 "YYYY/MM/DD" Observation date (UT) 61- 67 F7.2 km/s RV ? Radial velocity 69- 72 F4.2 km/s e_RV ? Standard error on RV (2) 74- 77 I4 s ExpTime2 ? Exposure time for Obs.dat2 79- 82 I4 ct Count2 ? Counts in 5200Å for Obs.dat2 84- 93 A10 "YYYY/MM/DD" Obs.dat2 ? Second observation date (UT)
Note (1): b = CS 29497-034 = HE 0039-2635. Note (2): Standard error of radial velocity sigma/sqrt(n), where sigma is the standard deviation of the values from individual lines and n is the number of lines used.
Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 2 I2 --- Seq Sequential number 4- 15 A12 --- Name Star name 17- 22 F6.3 mag Bmag Johnson B magnitude 24- 29 F6.3 mag Vmag Johnson V magnitude 31- 36 F6.3 mag Rmag Cousins R magnitude 38- 43 F6.3 mag Imag Cousins I magnitude 45- 50 F6.3 mag Jmag Johnson J magnitude 52- 57 F6.3 mag Hmag Johnson H magnitude 59- 64 F6.3 mag Kmag Johnson K magnitude 66- 69 F4.2 mag E(B-V) Reddening 71- 74 I4 K Teff Effective temperature from (V-K) colour index 76- 79 I4 K DTeff Difference in effective temperature (1)
Note (1): DTeff=Teff(V-K)0-<Teff(V-R)0, Teff(V-I)0, Teff(R-I)0>
Byte-by-byte Description of file: ew.dat
Bytes Format Units Label Explanations
1- 12 A12 --- Name Star name 14- 18 A5 --- Ion Species identification 20- 26 F7.2 0.1nm Lambda Wavelength in Angstroms 28- 31 F4.2 eV LEP Excitation potential 33- 37 F5.2 [-] log(gf) Log of the oscillator strength 39- 43 F5.1 10-13m EW1 ? Equivalent width (1)
Note (1): In units of milliAngstroms.
History: From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 10-Dec-2008
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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