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J/A+A/420/673       Elemental abundances of CP2 star HR 5049  (Nishimura+, 2004)

Chemical composition of the magnetic B star HR 5049. Nishimura M., Sadakane K., Kato K., Takeda Y., Mathys G. <Astron. Astrophys. 420, 673 (2004)> =2004A&A...420..673N
ADC_Keywords: Stars, Bp ; Abundances, peculiar Keywords: stars: abundances - stars: chemically peculiar - stars: individual: HR 5049 Abstract: A spectrum synthesis analysis for photospheric lines in the magnetic B star HR 5049 is presented, based on a high quality spectrogram obtained with the EMMI spectrograph attached to the NTT at ESO. It is found that light elements such as He, C and O are under-abundant. One of the most notable features is the deficiency of He by more than -2.0dex. Co and Cl are over-abundant by +3.5dex and +1.9dex, respectively. Other iron peak elements are over-abundant ranging from +0.47dex (Ti II) to +1.94 dex (Cr I). For rare earth elements, the lines of once-ionized species are generally weak, while the third spectra (especially those of Pr and Nd) are very prominent. Although rare earth elements show significant over-abundances ranging from +3.0dex to as large as +4.0dex, Ba has the solar abundance. The Nd-Pr abundance difference, which shows an apparent decreasing trend with increasing effective temperature among CP stars, is found to be unusually small in HR 5049. Description: We use a CCD spectrogram ranging from λ4070Å to λ6700Å which was obtained with the ESO New Technology Telescope (NTT) and the ESO Multi-Mode Instrument (EMMI) in the cross-dispersed echelle mode. The elemental abundances for individual lines of HR 5049 are determined by spectral synthesis. Objects: --------------------------------------------- RA (2000) DE Designation(s) --------------------------------------------- 13 25 50.3 -70 37 38 HR 5049 = HD 116458 --------------------------------------------- File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table2.dat 40 172 Analyses of individual atomic lines table2.tex 104 488 LaTeX version of table2
See also: J/A+A/407/631 : Catalogue of stellar effective magnetic fields (Bychkov+ 2003) J/A+AS/118/231 : Velocities + rotation of CP stars (Levato+, 1996) Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 6 A6 --- Ion Ion designation 8- 14 F7.2 0.1nm lambda Wavelength 16- 20 F5.2 eV Chi ? Excitation potential 22- 26 F5.2 --- loggf ? Oscillator strength 28- 29 A2 --- r_loggf Reference for loggf (1) 31- 32 A2 --- l_logN/H [≤ ] Limit flag on logN/H 33- 36 F4.2 [---] logN/H ? Elemental abundance logN/H 38- 40 A3 ---- Remark Remarks (2)
Note (1): gf-value references: B = Biemont et al., 2002, BF = Biemont et al., 1989A&A...209..391B HH = Hirata, & Horaguchi, T. 1995, Cat. VI/69 KX = Kurucz, R.L. 2001, LB = Lawler et al., 2001ApJ...556..452L LW = Lawler et al., 2001ApJ...563.1075L MR = Mashonkina et al., 2002, Cat. J/PAZh/28/41 NI = NIST, 2000, RU = Raasen & Uylings, 2000, Note (2): Remarks: HFS = the abundances determined by adopting the HFS data taken from Kurucz, 2001, C* = the abundance determined using several lines of the same numbers (*) in reference.
Acknowledgements: Masayoshi Nishimura
(End) Patricia Bauer [CDS] 07-Jun-2004
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