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| Query : 2011MNRAS.411..162G |
2011MNRAS.411..162G - Mon. Not. R. Astron. Soc., 411, 162-166 (2011/February-2)
Variations of the amplitudes of oscillation of the Be star Achernar.
GOSS K.J.F., KAROFF C., CHAPLIN W.J., ELSWORTH Y. and STEVENS I.R.
Abstract (from CDS):
We report on finding variations in amplitude of the two main oscillation frequencies found in the Be star Achernar, over a period of 5 yr. They were uncovered by analysing photometric data of the star from the Solar Mass Ejection Imager (SMEI) instrument. The two frequencies observed, 0.775 and 0.725/d, were analysed in detail and their amplitudes were found to increase and decrease significantly over the 5-yr period, with the amplitude of the 0.725/d frequency changing by up to a factor of 8. The nature of this event has yet to be properly understood, but the possibility of it being due to the effects of a stellar outburst or a stellar cycle are discussed.
Abstract Copyright: 2010 The Authors. Journal compilation2010 RAS
Journal keyword(s): asteroseismology - techniques: photometric - stars: activity - stars: emission-line, Be - stars: individual: Achernar - stars: oscillations
Simbad objects: 14
| Number of rows : 14 |
| N | Identifier | Otype |
ICRS (J2000) RA |
ICRS (J2000) DEC |
Mag U | Mag B | Mag V | Mag R | Mag I | Sp type |
#ref
1850 - 2026 |
#notes |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | * ksi Phe | a2* | 00 41 46.3972997520 | -56 30 04.738422240 | 5.90 | 5.70 | A3VpSrCr_Ksn | 137 | 0 | |||
| 2 | * alf Eri | Be* | 01 37 42.84548 | -57 14 12.3101 | -0.36 | 0.30 | 0.46 | 0.49 | 0.60 | B6Vpe | 495 | 1 |
| 3 | * alf Hyi | PM* | 01 58 46.1385834212 | -61 34 11.359751511 | 3.33 | 3.13 | 2.84 | 2.55 | 2.39 | F0IV | 225 | 0 |
| 4 | * alf UMi | cC* | 02 31 49.09456 | +89 15 50.7923 | 3.00 | 2.62 | 2.02 | 1.53 | 1.22 | F8Ib | 716 | 2 |
| 5 | * gam Dor | gD* | 04 16 01.5866224848 | -51 29 11.932714356 | 4.55 | 4.20 | F1V | 337 | 0 | |||
| 6 | * psi Eri | ** | 05 01 26.3457823592 | -07 10 26.273231188 | 3.87 | 4.61 | 4.78 | B3IV | 114 | 0 | ||
| 7 | * alf Aur | SB* | 05 16 41.35871 | +45 59 52.7693 | 1.33 | 0.88 | 0.08 | -0.52 | -0.96 | G3III: | 1207 | 0 |
| 8 | HD 49330 | bC* | 06 47 57.2679459720 | +00 46 34.035384504 | 8.45 | 9.14 | 8.95 | Bnn(e) | 98 | 0 | ||
| 9 | * alf Boo | RG* | 14 15 39.67207 | +19 10 56.6730 | 2.46 | 1.18 | -0.05 | -1.03 | -1.68 | K1.5IIIFe-0.5 | 2417 | 1 |
| 10 | HD 136064 | PM* | 15 14 38.3389842926 | +67 20 48.198556893 | 5.66 | 4.8 | F8V | 187 | 0 | |||
| 11 | HD 155410 | SB* | 17 09 33.2466658224 | +40 46 37.337081772 | 6.339 | 5.065 | K3III | 94 | 0 | |||
| 12 | * 36 Dra | PM* | 18 13 53.8328065738 | +64 23 50.225760192 | 5.407 | 4.987 | 4.8 | F5V | 215 | 0 | ||
| 13 | * alf Lyr | dS* | 18 36 56.33635 | +38 47 01.2802 | 0.03 | 0.03 | 0.03 | 0.07 | 0.10 | A0V | 2787 | 1 |
| 14 | * bet Cep | bC* | 21 28 39.5968513 | +70 33 38.574681 | 2.05 | 3.01 | 3.23 | 3.33 | 3.55 | B0.5IIIs | 756 | 0 |
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