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2005MNRAS.360..619J - Mon. Not. R. Astron. Soc., 360, 619-630 (2005/June-3)
Asteroseismology of the β Cephei star ν Eridani - IV. The 2003-2004 multisite photometric campaign and the combined 2002-2004 data.
JERZYKIEWICZ M., HANDLER G., SHOBBROOK R.R., PIGULSKI A., MEDUPE R., MOKGWETSI T., TLHAGWANE P. and RODRIGUEZ E.
Abstract (from CDS):
For ν Eri, analysis of the new data adds four independent frequencies to the nine derived previously from the 2002-2003 data: three in the range 7.20-7.93/d and a low one, equal to 0.614/d. Combining the new and the old data results in two further independent frequencies, equal to 6.7322 and 6.2236/d. Altogether, the oscillation spectrum is shown to consist of 12 high and two low frequencies. The latter have u amplitudes about twice as large as the v and y amplitudes, a signature of high radial-order g modes. Thus, we confirm the suggestion, put forward on the basis of the data of the first campaign, that ν Eri is both a β Cephei and a slowly pulsating B (SPB) star.
Nine of the 12 high frequencies form three triplets, of which two are new. The triplets represent rotationally split ℓ= 1 modes, although in case of the smallest-amplitude one this may be questioned. Mean separations and asymmetries of the triplets are derived with accuracy sufficient for meaningful comparison with models.
The first comparison star, µ Eri, is shown to be an SPB variable with an oscillation spectrum consisting of six frequencies, three of which are equidistant in period. The star is also found to be an eclipsing variable. The eclipse is a transit, probably total, the secondary is fainter than the primary by several magnitudes, and the system is widely detached.
The second comparison star, ξ Eri, is confirmed to be a δ Scuti variable. To the frequency of 10.8742/d seen already in the data of the first campaign, another, equal to 17.2524/d, is added.
Abstract Copyright: 2005 RAS
Journal keyword(s): stars: early-type - stars: individual: ν Eridani - stars: individual: µ Eridani - stars: individual: ξ Eridani - stars: oscillations - binaries: eclipsing
Simbad objects: 4
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