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Spectral line asymmetries in the metal-poor red giant HD 122563: CO5BOLD predictions versus observations by Klevas, J.; Kucinskas, A.; Ludwig, H. -G.; Bonifacio, P.; Steffen, M.; Prakapavicius, D. is a scholarly article available to read on EtoBox.

What is Spectral line asymmetries in the metal-poor red giant HD 122563: CO5BOLD predictions versus observations about?

We study the influence of convection on the asymmetries and Doppler shifts of Fe I spectral lines in the metal-poor red giant HD 122563. To this end, we compute theoretical Fe I line shifts and line bisectors using 3D hydrodynamical model atmosphere of HD 122563 calculated with the CO5BOLD code. We then make a detailed comparison of the theoretical line shifts and bisectors with those derived from the high quality HARPS spectrum of HD 122563 taken from the ESO Science Archive Facility (R = 115 000, average signal-to-noise ratio, S/N = 310). In general, we find a good agreement between the theoretically predicted and observed Doppler shifts of Fe I line cores, with somewhat larger discrepancies seen in the case of weaker (equivalent width W < 5 pm) and stronger lines (W > 11 pm). Both observed and theoretical coreshifts cover a range between 0 and -1 km/s, with increasingly stronger blueshifts for weaker lines and slight hints of a coreshift dependence on wavelength. Theoretical bisectors reproduce the observed ones reasonably well too, however, theoretical bisectors of the weak red (lambda > 600 nm) Fe I lines have blueshifts that are by up to 200 m/s larger than observed. The obta

Author

Klevas, J.; Kucinskas, A.; Ludwig, H. -G.; Bonifacio, P.; Steffen, M.; Prakapavicius, D.

Published

2013

Language

EN