Pre-Main Sequence Ap Star LkHα 324/B in LDN 988 Star Forming Region

نویسندگان

چکیده

We present results of the investigation star LkHα 324/B, which belongs to starforming dark cloud LDN 988. Based on high resolution spectroscopy, we determined its fundamental parameters as Teff=11,175±130 K, log(L*/L⊙)=1.87±0.07. According these parameters, found that 324/B is a pre-main sequence with mass M≈3M⊙ and age t≈2.9 Myr. Recently, it underwent phase actively accreting Herbig Ae/Be star, but accretion has now ceased in system. This consistent fact surrounded by circumstellar disk an inner cavity, was from spectral energy distribution. Our analysis revealed peculiar abundance pattern typical those magnetic Ap stars. It possesses mild underabundance light elements excess up ∼2–4 dex (in comparison Sun) iron peak rare earth elements. no evidence for abrupt vertical abundances gradients lines forming region atmosphere, agreement theoretical diffusion calculations this temperature domain. From intensification magnetically sensitive lines, deduced probably hosts global field ⟨B⟩≈3.5 kG strength. suppose stabilizing role favored elements’ separation before reached main sequence.

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ژورنال

عنوان ژورنال: Universe

سال: 2023

ISSN: ['2218-1997']

DOI: https://doi.org/10.3390/universe9050210