Abundance Analysis of the Peculiar Star HD 101065

Przybylski, A.

doi:10.1038/210020a0

Cited by 26 publications

(12 citation statements)

References 3 publications

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“…This phenomenon turned out to be characteristic of other Ap stars, which formed the group of roAp stars. The first attempts to identify the lines in the spectrum of HD 101065 were made by Przybylski [33,34] and Warner [37]. In these papers we encounter the first mention of the possible presence of the lithium resonance doublet in the spectrum of HD 101065.…”

Section: Hd 101065 Przybylski's Star--a Unique Representative Of Thementioning

confidence: 98%

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Lithium in chemically peculiar CP stars with magnetic fields

Polosukhina

Шаврина

2007

Astrophysics

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The problem of lithium in chemically peculiar Ap-CP stars has been the subject of debate for many years. The main reason for this is a lack of spectral observations of Ap stars in the neighborhood of the lithium resonance doublet Li I 6708 Å. An international cooperation project on "Lithium in cool CP stars with magnetic fields" was started in 1996. Systematic observations of CP stars in spectral regions of the 6708 Å and 6103 Å lines at the ZTSh (CrAO), CAT (ESO), Feros (ESO), and the 74" telescope of the Mount Stromlo Observatory (Australia) have been used to analyze spectra of several CP stars studied by the way the 6708 Å lithium line varies with the stars' rotational phase. Monitoring of the spectra of the oscillating CP stars (group I) HD 83368, HD 60435, and HD 3980, for which significant Doppler shifts of the Li I 6708 Å line are observed led to the discovery of "lithium spots" on the surface of these stars whose positions are related to the magnetic field structure. Models of the surfaces of these stars with the special program "ROTATE" based on the profiles of the Li I 6708 Å line are used to estimate the size of the spots, their positions on the stars' surface, and the lithium abundances in these spots. A detailed analysis and modelling of the spectra of slowly rotating oscillating CP stars with strong, invariant lithium 6708 Å emission, including blending with lines of the rare earth elements, reveals an enhanced lithium abundance, with the abundance determined from the lithium 6103 Å line being higher than that determined from the 6708 Å line for all the stars. This may indicate vertical stratification of lithium in the atmospheres of CP stars with an anomalous isotopic composition ( 6 Li/ 7 Li = 0.2 -0.5). HD 101065, an ultraslow rotator ( 5 1 sin . i ≈ L ) visible from the poles and with powerful oscillations which cause pulsating line broadening in its spectrum, is unique among these stars. The amount of lithium in the atmosphere of HD 101065 logN(Li) = 3.1 on a scale of logN(H) = 12.0 and the isotope ratio 0.3 Li Li/ 7 6 ≈. The high estimates of 6 Li/ 7 Li may be explained by the production of lithium in spallation reactions and the preservation of surface 6 Li and 7 Li by strong magnetic fields in the upper layers of the atmosphere near the magnetic poles.

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Section: Hd 101065 Przybylski's Star--a Unique Representative Of Thementioning

confidence: 98%

“…whose spectra have an abundance of individual peculiarities, the star HD 101065 is the most unusual and most popular[33,34]. Przybylski's first report in 1975 at the 32-nd IAU Colloquium, in which an original spectrum of HD 101065 was shown, created a strong impression among specialists in Ap stars and immediately drew attention to this star.…”

mentioning

confidence: 97%

Lithium in chemically peculiar CP stars with magnetic fields

Polosukhina

Шаврина

2007

Astrophysics

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“…Now this phenomenon is known to be typical of other Ap stars, which form the group of roAp stars. The first attempts to identify the lines in the spectrum of HD 101065 were made by Przybylski (1961Przybylski ( , 1966, and Warner (1966). These papers mention for the first time the possible presence of the resonance lithium doublet.…”

Section: Introductionmentioning

confidence: 99%

“…Among the rapidly oscillating Ap (roAp hereafter) stars, HD 101065 is the most unusual (Przybylski 1961(Przybylski , 1966. The report of Przybylski in 1976 at the IAU Symp.…”

Section: Introductionmentioning

confidence: 99%

The spectrum of the roAp star HD 101065 (Przybylski's star) in the Li I 6708 Å spectral region

Шаврина

Polosukhina²,

Pavlenko

et al. 2003

A&A

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Abstract. We carried out a detailed analysis of spectra of the unique roAp star HD 101065 (Przybylski's star) near the resonance doublet Li I 6708 Å, using a most complete line list including all possible transitions between REE levels of the NIST database. Our model calculations were performed under two assumptions: a blend of Li and REE lines, and a blend of REE lines only. They prove that Li lines are present in the range 6707.72−6708.02 Å and that the resulting Li abundance is 3.1 dex (in the scale log N(H) = 12.0), while the isotopic ratio 6 Li/ 7 Li is near to 0.3.

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“…• 7232 = V816 Cen HD 101065, also known as Przybylski's star, is one of the most peculiar stars known: its visible spectrum is strongly dominated by the rare earth lines (Przybylski 1961(Przybylski , 1963(Przybylski , 1966Cowley et al 1977) whose abundances are estimated as high as five orders of magnitude if compared to cosmic abundances (Wegner & Petford 1974). The iron peak elements, formerly considered to be underabundant in the visible spectrum, have been found to be strongly represented in the ultraviolet region 1900 − 3200Å (Wegner et al 1983).…”

Section: Hd 101065 = Cod−46mentioning

confidence: 99%