2008A&A...479L..29K


C.D.S. - SIMBAD4 rel 1.7 - 2021.03.07CET02:43:12

2008A&A...479L..29K - Astronomy and Astrophysics, volume 479, L29-32 (2008/2-4)

The discovery of high-amplitude, 10.9-minute oscillations in the cool magnetic Ap star HD115226.

KOCHUKHOV O., RYABCHIKOVA T., BAGNULO S. and LO CURTO G.

Abstract (from CDS):

We present the discovery of pulsational variations in the cool magnetic Ap star HD115226 - the first high-amplitude rapidly oscillating Ap (roAp) star discovered with time-series spectroscopy. Using high-resolution spectra obtained with the HARPS instrument at the European Southern Observatory 3.6-m telescope, we detect radial velocity variations with a period of 10.86min in PrIII, NdIII, DyIII lines, and in the narrow cores of hydrogen lines. Pulsational amplitudes exceed 1 km/s in individual lines of NdIII. The presence of running waves in the stellar atmosphere is inferred from a phase shift between the radial velocity maxima of rare-earth and hydrogen lines. Our abundance analysis demonstrates that HD115226 exhibits a typical roAp spectroscopic signature, notably ionization anomaly of Pr, Nd, and Dy. We discuss the discovery of pulsations in HD115226 in the context of recent spectroscopic studies of roAp stars and point to the existence of a correlation between spectroscopic pulsational amplitude and the stellar rotation rate.

Abstract Copyright:

Journal keyword(s): stars: atmospheres - stars: chemically peculiar - stars: oscillations - stars: individual: HD115226

Simbad objects: 11

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Number of rows : 11

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 V* BN Cet a2* 02 06 15.8110823501 -19 07 26.207320762   10.56 10.17     ApSrEuCr 44 0
2 V* BT Hyi a2* 03 00 37.0866229611 -81 54 07.306588727   9.64 9.35     ApSrEuCr 45 0
3 V* V409 Car a2* 07 30 56.9889252164 -57 59 28.237596257   9.13 8.89     ApSr(Eu) 116 0
4 HD 75445 PM* 08 48 42.9335149812 -39 14 01.937632656   7.40 7.12     ApSrEu(Cr) 52 0
5 HD 83368 a2* 09 36 25.40686 -48 45 04.2549   6.480 6.232     A8VSrCrEu+F9V 259 0
6 HD 99563 a2* 11 27 16.63609 -08 52 08.1942           A9III 73 0
7 HD 115226 a2* 13 18 00.0187343885 -72 57 00.946459151   8.84 8.50     ApSr(Eu) 30 0
8 HD 116114 PM* 13 21 46.3077068552 -18 44 31.541856988   7.34 7.02     F0VpSrCrEu 124 0
9 * bet CrB a2* 15 27 49.7315305 +29 06 20.522375 4.08 3.97 3.68 3.50 3.45 F2VpSrCrEuSi 661 0
10 HD 154708 a2* 17 10 28.5160730229 -58 00 17.417264870   9.23 8.76     ApSrEu 75 0
11 * 10 Aql a2* 18 58 46.9239770704 +13 54 23.944546333 6.23 6.14 5.89     A7VpSrEu_Ksn 275 0

    Equat.    Gal    SGal    Ecl

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2021.03.07-02:43:12

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