The enigma of lithium in roAp-CP stars. Some observational results obtained with different telescopes

Polosukhina, N. S.; Шаврина, А. В.; Драке, Н. А.; Hack, Margherita; North, P.; Quinet, Pascal; Zverko, J.; Pavlenko, Ya. V.; Tsymbal, V.; Khalack, V.; Veles, A. A.; Wood, P. R.; Reza, R. de la; Shakhovskoy, D. N.

doi:10.1017/s1743921305005387

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“…The abundance anomalies form spots or rings on the stellar surface, whose location is related to the magnetic field structure. Polosukhina et al (2003a) studied the behavior of the resonance line Li i λ6708 in eleven CP stars. We have also observed HD 15144 whose physical atmospheric parameters (T eff and log g) are similar to those of HD 3980.…”

Section: Introductionmentioning

confidence: 99%

The Spotted Li abundance on the surface of the CP star HD 3980

et al. 2004

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Abstract.We report the results of the spectral monitoring of the chemically peculiar (CP2) star HD 3980 in the Li i λ6708 spectral region. High spectral resolution observations (R = 88000) were carried out at Mount Stromlo Observatory with the 74-inch telescope and the echelle spectrograph. HD 3980 is a late type Ap SrCrEu star with strong double-wave photometric variations in the visible and in the near infrared. We estimated the effective temperature, surface gravity, mass, luminosity, and radius of this star. The monitoring of this star shows strong spectral variations, especially in the profile of Li i λ6707.8. We studied the variations of the equivalent width and position of the Li i line as a function of the rotating phase and compared them with the magnetic field variations and light curves taken from the literature. The synchronism of the variations of the Li i line profile, light curve, and magnetic field strength can be explained in terms of the oblique magnetic rotator model. The strong variations of position and intensity of this line with the rotation phase enable us to consider this star as a new member of the intriguing group of "Li-spotted" CP stars.

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Section: Introductionmentioning

confidence: 99%