SPECTRAL ANALYSIS OF A NEWLY DISCOVERED HgMn STAR: HD 318126

Tolgahan KILIÇOĞLU, Richard MONIER, Luca FOSSATI, Berahitdin ALBAYRAK

Abstract


We present a spectroscopic analysis of HD 318126, a member of the M6 (NGC 6405,
age ~100Myr) open cluster, using low and high-resolution (R~7500, R~25000) spectra stretching from
4500-5840 Å. The data were obtained with the multi-fiber spectrograph GIRAFFE with MEDUSA,
mounted at UT2 (Kueyen), the 8 meter class VLT telescope, in Chile. The atmospheric parameters of the
star were determined from Geneva photometry and hydrogen line modeling (Te = 12000 ± 200 K, log g =
4.1 ± 0.1). The projected rotational velocity of 55 ± 5 km s-1 was derived from several unblended metallic
lines. The abundances of 10 elements were determined by fitting synthetic spectral lines to observed ones
(using a best-fitting method). We derived a strong overabundance of mercury (+5.00 ± 0.25 dex, relative
to the Sun) and manganese (+2.3 ± 0.3 dex, relative to the Sun). Ti, Cr, Ni, Zr, Y, and Ba elements are
overabundant as well. These abundance anomalies indicate that HD318126 is a HgMn type star (CP3).

Keywords


spectral analysis; open cluster: M6; HgMn stars

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Ege University Journal of the Faculty of Science

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