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J/MNRAS/356/1256    Elemental abundance analysis of HR 8216     (Caliskan, 2005)

Elemental abundance analysis of magnetic chemically peculiar star HR 8216. Caliskan H. <Mon. Not. R. Astron. Soc. 356, 1256 (2005)> =2005MNRAS.356.1256C (SIMBAD/NED BibCode)
ADC_Keywords: Stars, peculiar ; Abundances, peculiar Keywords: stars: abundances - stars: chemically peculiar - stars: individual: HR 8216 Abstract: We have performed the abundance analysis of the cool magnetic CP star HR 8216 (=HD 204411) using 2.4Å/mm Dominion Astrophysical Observatory Reticon exposures covering ll 3830-4770Å with a typical signal-to-noise ratio of 200. The spectrograms were measured interactively with the graphics computer program REDUCE. We performed a fine analysis with an ATLAS9 metal-rich model atmosphere whose predictions best matched the optical region fluxes and the Hg profile. HR 8216's anomalies are primarily an enhancement of many iron peak elements with the rare earths elements much less enhanced than for many similar cool magnetic CP stars .Using the results of the fine analysis we synthetized the spectrum. Comparison with the observed spectrum showed that agreement is better. Objects: ----------------------------------------------------------- RA (2000) DE Designation(s) (SpType) ----------------------------------------------------------- 21 26 51.2 +48 50 05 HR 8216 = HD 204411 (A6peV) ----------------------------------------------------------- File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table6.dat 40 734 Elemental abundances
See also: J/A+AS/107/353 : CP stars (Lopez-Garcia+, 1994) J/A+AS/125/219 : Abundances of mu Lep, 7 Sex, HR 4817 + 28 Her (Adelman+ 1997) J/A+AS/129/563 : Abundances of HR 4487, 14 Hyd and 3 Cen A (Pintado+ 1998) J/A+A/354/899 : Elemental abundance analyses IV. (Adelman+, 2000) J/MNRAS/316/514 : 28 And + 99 Her elemental abundances (Adelman+, 2000) J/A+A/367/597 : ups Her, phi Her + HR 7018 abundances (Adelman+, 2001) J/A+A/371/1078 : Elemental abundance of 4 normal B and A stars (Adelman+ 2001) J/A+A/394/187 : γ Ser + 101 Her elemental abundances (Caliskan+, 2002) J/A+A/406/975 : Elemental abundances of four A-B stars (Kocer+, 2003) J/A+A/406/987 : Elemental abundances of three CP stars (Pintado+, 2003) Byte-by-byte Description of file: table6.dat
Bytes Format Units Label Explanations
1- 5 A5 --- Ion Ion name 6- 11 A6 --- No Multiplet number from Moore (1945) if first line of multiplet, if not from Moore an initial indicating the paper (1) 13- 19 F7.2 0.1nm Lambda Laboratory wavelength (air) 21- 25 F5.2 --- log(gf) Oscillator strength 28- 29 A2 --- r_log(gf) Reference to oscillator strength (2) 31- 33 I3 0.1pm EW1 ? Equivalent width for HR 8216 35- 40 F6.2 --- log(N/H) ? Elemental abundance for HR 8216 (3)
Note (1): The following acronyms are used: C: Catalan et al., 1964, J. Res. NBS, 68A, 9 J: Johansson S., 1978, Phys. Scripta, 18, 217 K: Kurucz & Bell 1995, Kurucz CD-Rom No. 23 MCS: Meggers et al., 1975, Tables of Spectral-Line Intensities, US Goverment Printing Office, Washington, DC N: Nave et al., 1994, Cat. J/ApJS/94/221 Note (2): Sources of gf-values are the following: BG = Biemont et al. (1989A&A...209..391B) for V II; Biemont et al. (1981ApJ...248..867B) for Zr II BK = Biemont et al. (1982A&A...107..166B) FW = Fuhr & Wiese (1990, in Lide D.R. ed., CRC Handbook of Chemistry and Physics, CRC Press, Cleveland, OH) HL = Hannaford et al. (1982ApJ...261..736H) KX = Kurucz & Bell (1995, Atomic Data for Opacity Calculations, Kurucz CD-Rom No. 23, (Smithsonian Astrophysical Observatory, Cambridge, MA) LA = Lanz & Artru (1985PhyS...32..115L) LD = Lawler & Dakin (1989, JOSA B, 6, 1457) MF = Fuhr, Martin & Wiese (1988, Cat. VI/72); Martin, Fuhr & Wiese (1988, Cat. VI/72) MC = Magazzu & Cowley (1986ApJ...308..254M) MW = Miles & Wiese (1969, NBS Technical Note No. 474) WF = Wiese, Fuhr & Deters (1996, J. Phys. Chem. Ref. Data, Monograph 6) WM = Wiese & Martin (1980, NSRDS-NBS 68, Part.2, US Governement Printing Office, Washington) WS = Wiese, Smith & Glennon (1966, NSRDS-NBS 4, US Governement Printing Office, Washington); Wiese, Smith & Miles (1969, NSRDS-NBS, D.C., US Department of Commerce, National Bureau of Standards) WV = Ward (1985MNRAS.213...71W) Note (3): The designations are: N = number of atoms/volume of particular element Ntot = number of atoms/volume of all elements
Acknowledgements: Hulya Caliskan References: Moore, 1945, A multiplet table of astrophysical interest, Princeton, N.J., The Observatory, 1945. Rev. ed.
(End) Patricia Vannier [CDS] 09-Sep-2003
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