Ryabchikova, T., Wade, G.A., Aurière, M., Bagnulo, S., Donati, J-F., Jeffers , S.V., Johnson, N., Landstreet, J.D., Lighnières, F., Lueftinger, T., Marsden, S., Mouillet, D., Paletou , F., Petit, P., Reegen, P., Silvester, J., Strasser, S., and Toque, N. (2005) Rotational periods of four roAp stars. Astronomy & Astrophysics, 429 (3). L55-L58.

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Abstract

Abstract. Forty-five new measurements of the mean longitudinal magnetic fields and mean equivalent widths of 4 roAp stars have obtained using theMuSiCoS spectropolarimeter at Pic duMidi observatory. These new high-precision data have been combined with archival measurements in order to constrain the rotational periods of HD 12098, HD 24712 = HR 1217, HD 122970 and HD 176232 = 10 Aql. We report a revised rotational period for HD 24712 (Prot = 12.45877 ± 0.00016 d, crucial for interpretation of upcoming MOST observations of this star), new rotational periods for HD 12098 and HD 122970 (Prot = 5.460 ± 0.001 d and Prot = 3.877 ± 0.001 d, respectively) and evidence for an extremely long period for HD 176232.

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