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Table 6
Comparison of η and μ Cen.
| Property | η Cen | μ Cen |
|
|
||
| MK type | B2 Ve | B2 Vnpe |
| v sin i [km s-1] | 300 | 155 |
| Inclination angle [deg] | 85 | 19 |
| Rotation frequency [c/d] | 1.7 | 2.1 |
| Low (beat?) frequencies [c/d] | 0.034 | 0.018; 0.034 |
| Outbursts synchronized | ||
| with slow light curve? | Y | Y |
| Frequencies of | 1.732; 1.764 | 1.970; 1.988; |
| interacting NRP modes [c/d] | 2.022 | |
| Degree and order of | 2, + 2; 2,+ 2 | 2, + 2; 2, + 2; |
| interacting NRP modes | 2, + 2 | |
| Semi-amplitudes of | ||
| interacting modes [mmag] | 3; 2.5 | N/A |
| Peak-to-peak amplitude | ||
| of outbursts [mmag] | 100 | 250 |
| Main circumstellar Štefl | ||
| frequency [c/d] | 1.56 | 1.6 |
| Štefl frequency detected | ||
| by BRITE? | Y | N |
| Štefl frequency permanent? | Y | N |
Notes. Main sources: Rivinius et al. (1998b), Rivinius et al. (2001), Rivinius et al. (2003), this study, and SIMBAD. N/A = not available. The identification of also the second 1.7-c/d variability in the Heros spectra of η Cen as ℓ = m = + 2 is by Zaech & Rivinius (unpublished).
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