Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001a%26a...377l..22k&link_type=abstract
Astronomy and Astrophysics, v.377, p.L22-L25 (2001)
Astronomy and Astrophysics
Astrophysics
46
Stars: Chemically Peculiar, Stars: Oscillations, Stars: Individual: Alpha Cir, Hr 3831
Scientific paper
We report preliminary results of our new time-resolved high-resolution spectroscopic observations of the roAp stars alpha Cir, and HR 3831. Analysis of pulsational behaviour of individual spectral lines in the 6116-6156 Å, spectral region revealed that in both stars it is dominated by the strong rapid variations of the Nd Iii, 6145.07 Å, spectral line. Oscillations of the Nd Iii, spectral feature are also rotationally modulated. In addition we observed strong rotational modulation of the average HR 3831, line profiles caused by abundance spots on the stellar surface. Weaker rotational modulation was also discovered for the metal lines in the alpha Cir, spectrum. This variability agrees with the rotational period of alpha Cir, obtained from the splitting of the principal pulsation frequency. Based on observations obtained at the European Southern Observatory (La Silla, Chile).
Kochukhov Oleg
Ryabchikova Tanya
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