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J/MNRAS/446/2348      Chemical analysis of CH stars. II.     (Karinkuzhi+, 2015)

Chemical analysis of CH stars - II. Atmospheric parameters and elemental abundances. Karinkuzhi D., Goswami A. <Mon. Not. R. Astron. Soc., 446, 2348-2362 (2015)> =2015MNRAS.446.2348K (SIMBAD/NED BibCode)
ADC_Keywords: Stars, carbon ; Stars, late-type ; Abundances ; Equivalent widths Keywords: stars: abundances - stars: carbon - stars: late-type - stars: Population II Abstract: We present detailed chemical analyses for a sample of 12 stars selected from the CH star catalogue of Bartkevicius (1996BaltA...5..217B). The sample includes two confirmed binaries, four objects that are known to show radial velocity variations and the rest with no information on the binary status. A primary objective is to examine if all these objects exhibit chemical abundances characteristics of CH stars, based on detailed chemical composition study using high-resolution spectra. We have used high-resolution (R∼42000) spectra from the ELODIE archive (Moultaka et al. 2004PASP..116..693M). These spectra cover 3900 to 6800 Å in the wavelength range. We have estimated the stellar atmospheric parameters, the effective temperature Teff, the surface gravity log g, and metallicity [Fe/H] from local thermodynamic equilibrium analysis using model atmospheres. Estimated temperatures of these objects cover a wide range from 4200 to 6640 K, the surface gravity from 0.6 to 4.3 and metallicity from -0.13 to -1.5. We report updates on elemental abundances for several heavy elements, Sr, Y, Zr, Ba, La, Ce, Pr, Nd, Sm, Eu and Dy. For the object HD 89668, we present the first abundance analyses results. Enhancement of heavy elements relative to Fe, a characteristic property of CH stars is evident from our analyses in the case of four objects, HD 92545, HD 104979, HD 107574 and HD 204613. A parametric-model-based study is performed to understand the relative contributions from the s- and r-process to the abundances of the heavy elements. Description: Low-resolution spectra of these objects obtained from 2m Himalayan Chandra Telescope at the Indian Astronomical Observatory, Hanle using HFOSC clearly show strong features due to carbon. HFOSC is an optical imager cum spectrograph for conducting low- and medium-resolution grism spectroscopy (http://www.iiap.res.in/iao/hfosc.html). High-resolution spectra necessary for abundance analyses of the programme stars are taken from the ELODIE archive (Moultaka et al. 2004PASP..116..693M). File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 66 12 Basic data for the programme stars table4a.dat 71 197 Fe lines used for deriving atmospheric parameters for the first 6 objects table4b.dat 70 197 Fe lines used for deriving atmospheric parameters for the next 6 objects table8a.dat 71 140 Equivalent widths in mÅ of lines used for the calculation of light element abundances for first 6 objects table8b.dat 70 140 Equivalent widths in mÅ of lines used for the calculation of light element abundances for next 6 objects table9a.dat 71 100 Equivalent widths in mÅ of lines used for abundance determination of heavy elements for the first 6 objects table9b.dat 70 100 Equivalent widths in mÅ of lines used for abundance determination of heavy elements for the next 6 objects
See also: J/ApJS/105/419 : Spectral Atlas of Carbon Stars (Barnbaum+ 1996) J/MNRAS/440/1095 : Chemical analysis of CH stars (Karinkuzhi+, 2014) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 9 A9 --- Name Star name (HD NNNNNN) 11- 12 I2 --- Num [1/12] Star number, as in other tables 14- 15 I2 h RAh Simbad Hour of Right Ascension (J2000) 17- 18 I2 min RAm Simbad Minute of Right Ascension (J2000) 20- 24 F5.2 s RAs Simbad Second of Right Ascension (J2000) 26 A1 --- DE- Simbad Sign of the Declination (J2000) 27- 28 I2 deg DEd Simbad Degree of Declination (J2000) 30- 31 I2 arcmin DEm Simbad Arcminute of Declination (J2000) 33- 37 F5.2 arcsec DEs Simbad Arcsecond of Declination (J2000) 39- 43 F5.2 mag Bmag Simbad B-band magnitude 45- 48 F4.2 mag Vmag Simbad V-band magnitude 50- 54 F5.3 mag Jmag Simbad J-band magnitude 56- 60 F5.3 mag Hmag Simbad H-band magnitude 62- 66 F5.3 mag Kmag Simbad K-band magnitude
Byte-by-byte Description of file: table4a.dat
Bytes Format Units Label Explanations
1- 8 F8.3 0.1nm Wave Wavelength (Å) 10- 14 A5 --- El Element 16- 20 F5.3 eV Elow Lower energy level 22- 27 F6.3 [-] loggf Oscillator strength 29- 35 F7.3 0.1pm Abund1 ? HD 55496 abundance 37- 43 F7.3 0.1pm Abund2 ? HD 89668 abundance 45- 50 F6.2 0.1pm Abund3 ? HD 92545 abundance 52- 57 F6.2 0.1pm Abund4 ? HD 104979 abundance 59- 64 F6.2 0.1pm Abund5 ? HD 107574 abundance 66- 71 F6.2 0.1pm Abund6 ? HD 111721 abundance
Byte-by-byte Description of file: table4b.dat
Bytes Format Units Label Explanations
1- 8 F8.3 0.1nm Wave Wavelength (Å) 10- 14 A5 --- El Element 16- 20 F5.3 eV Elow Lower energy level 22- 27 F6.3 [-] loggf Oscillator strength 29- 34 F6.2 0.1pm Abund7 ? HD 122202 abundance 36- 41 F6.2 0.1pm Abund8 ? HD 126681 abundance 43- 48 F6.2 0.1pm Abund9 ? HD 148897 abundance 50- 55 F6.2 0.1pm Abund10 ? HD 164922 abundance 57- 62 F6.2 0.1pm Abund11 ? HD 167768 abundance 64- 70 F7.3 0.1pm Abund12 ? HD 204613 abundance
Byte-by-byte Description of file: table8a.dat table9a.dat
Bytes Format Units Label Explanations
1- 8 F8.3 0.1nm Wave Wavelength (Å) 10- 14 A5 --- El Element 16- 20 F5.3 eV Elow Lower energy level 22- 27 F6.3 [-] loggf Oscillator strength 29- 35 F7.3 0.1pm EW1 ? HD 55496 equivalent width of line (mÅ) 37- 43 F7.3 0.1pm EW2 ? HD 89668 equivalent width of line (mÅ) 45- 50 F6.2 0.1pm EW3 ? HD 92545 equivalent width of line (mÅ) 52- 57 F6.2 0.1pm EW4 ? HD 104979 equivalent width of line (mÅ) 59- 64 F6.2 0.1pm EW5 ? HD 107574 equivalent width of line (mÅ) 66- 71 F6.2 0.1pm EW6 ? HD 111721 equivalent width of line (mÅ)
Byte-by-byte Description of file: table8b.dat table9b.dat
Bytes Format Units Label Explanations
1- 8 F8.3 0.1nm Wave Wavelength (Å) 10- 14 A5 --- El Element 16- 20 F5.3 eV Elow Lower energy level 22- 27 F6.3 [-] loggf Oscillator strength 29- 34 F6.2 0.1pm EW7 ? HD 122202 equivalent width of line (mÅ) 36- 41 F6.2 0.1pm EW8 ? HD 126681 Equivalent width of line (mÅ) 43- 48 F6.2 0.1pm EW9 ? HD 148897 equivalent width of line (mÅ) 50- 55 F6.2 0.1pm EW10 ? HD 164922 equivalent width of line (mÅ) 57- 62 F6.2 0.1pm EW11 ? HD 167768 equivalent width of line (mÅ) 64- 70 F7.3 0.1pm EW12 ? HD 204613 equivalent width of line (mÅ)
History: From electronic version of the journal References: Karinkuzhi et al., Paper I., 2014MNRAS.440.1095K, Cat. J/MNRAS/440/1095
(End) Tiphaine Pouvreau [CDS] 31-Oct-2017
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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