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High Resolution Optical Spectroscopy of a B-type Abundance Standard Candidate in Ori OB1—HD 35039

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Abstract

We present LTE analysis of high resolution optical spectra for the B-type abundance standard candidate HD 35039 (HR 1765, 22 Ori) with an ambigous binary nature. The spectra were obtained with the 3.9-m Anglo-Australian Telescope (AAT) and the UCLES spectrograph. The standard 1D LTE analysis with line-blanketed LTE model atmospheres and spectral synthesis provided fundamental atmospheric parameters of Teff = 22000 ± 1300 K, log g = 3.5 ± 0.3, ξ = 6.0 ± 3.0 km s−1, v sin i = 5.0 ± 1.0 km s−1, [Fe/H] = −0.3 dex, and the photospheric abundances of eleven elements. The FEROS spectrum of the star from the public spectra archive were also obtained and used to test the model parameters of the star: Hydrogen Paschen lines (P12, P13, and P14) provided a good fit for the reported model parameters. We have also acquired high resolution HIDES and HERMES spectra of the star. The error margins in the reported model parameters as well as their degeneracies were tested by the Bayesian inference method. We detect for the first time the P III 4059, 4222, and 4246 Å lines and determine the phosphorus abundance, log ϵ(P)= 4.95 ± 0.3 dex (i.e., [P/Fe] = −0.15 dex), from line synthesis. The obtained argon abundance, log ϵ(Ar) = 6.55 ± 0.19 dex, agrees well with the literature measurements. For the remaining elements, abundances determined in this study for HD 35039 are lower than the average abundances of B dwarfs of well studied OB associations as well as the mean abundances of a sample of early B-type stars in the solar neighbourhood, by up to 0.3 dex. In the FEROS, HIDES, and HERMES spectra, we observe the emission in the high-excitation lines of Si II and Al II. We find a variable radial velocity, with a peak-to-peak amplitude of about 10 km s−1.

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Acknowledgments

This paper is based on observations obtained at the Anglo-Australian Telescope. Authors would like to thank to anonymous refrees for their suggestions to improve the manuscript. AD is financially supported by the Croatian Science Foundation through grant IP 2014-09-8656, which also enabled a post-doctoral fellowship to him. We thank to Prof. D.L. Lambert for his comments on HR 1765. We also thank to Peter De Cat for acquiring additional spectrum for us at the Mercator telescope on our request. TS thanks to K. Sadakane for providing HIDES spectrum of the star.

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Correspondence to Timur Şahin.

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Şahin, T., Dervişoğlu, A. High Resolution Optical Spectroscopy of a B-type Abundance Standard Candidate in Ori OB1—HD 35039. Astron. Lett. 45, 528–545 (2019). https://doi.org/10.1134/S1063773719080073

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