• A. Arellano Ferro

      Articles written in Journal of Astrophysics and Astronomy

    • An internally consistent set of oscillator strengths for Fe I lines

      Sunetra Giridhar A. Arellano Ferro

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      We present here an extensive list of internally consistent oscillator strengths for Fe I lines. We have compiled and critically reviewed the oscillator strengths existing in literature. An attempt has been made to scale the oscillator strengths derived by different workers to that of Blackwell and his collaborators and prepare a single consistent set of oscillator strengths.

      We have calibrated a loggf- log λ- E1- log I relationship that can be used for calculatinggf values for Fe I lines with nogf values available. We demonstrate that standard error of such a calibration can be considerably reduced by binning the data in 0.5 eV range in excitation potential.

      We also tabulate systematic corrections to be applied to the oscillator strengths of Kurucz & Peytremann (1975) for lines belonging to different multiplets

    • Abundance analysis of the long period southern cepheid RZ Vel

      Sunetra Giridhar A. Arellano Ferro Aruna Goswami

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      The long period classical cepheid RZ Vel (HD 73502) is known to be a member of an OB association, Vel OB1 in Vela, and a high metallicity is ascribed to it by the photometric work of Eggen (1982). We have done an abundance analysis for this long period (P = 20.4 days) and hence young (age ≈ 1.80×107 yr) classical cepheid using high resolution CCD spectra with good S/N ratio. We have used a detailed model atmosphere method to derive the abundances of the light elements C, O, A1, S and of many Fe-peak elements and a few s-process elements. Our present work indicates near solar abundance for most of the elements for RZ Vel and hence we do not confirm the high metallicity derived photometrically by Eggen (1982) for this star

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      Posted on January 27, 2016

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