Vertical stratification of Cr in the atmospheres of CP stars

Details Vertical stratification of Cr in the atmospheres of CP stars Vertical stratification of Cr in the atmospheres of CP stars

Jul 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998astl...24..516s&link_type=abstract

Astronomy Letters, Volume 24, Issue 4, July 1998, pp.516-527; Pis'ma v Astronomicheskii Zhurnal, Vol. 24, p. 601

Astronomy and Astrophysics

Astronomy

6

Scientific paper

We study the vertical stratification of Cr in the atmospheres of nine chemically peculiar (CP) Am and Ap stars. Based on high-spectral-resolution CCD spectrograms from the coude spectrograph of the 2.6-m Crimean Astrophysical Observatory telescope, we analyze the Cr II lines in the wings of the Balmer Hα line by the method of spectrum synthesis. We suspect the same small Cr enhancement in the upper atmospheric layers of all the Am stars studied; no evidence of noticeable Cr stratification has been found in the Ap star alpha^2 CVn, while beta CrB, HR 7575, 10 Aql, and nu Equ exhibit an increase in the Cr abundance with depth. Using beta CrB as an example, we show that our results depend only slightly on the uncertainties in choosing the stellar-model-atmosphere parameters.

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