2003A&A...399..639A


Query : 2003A&A...399..639A

2003A&A...399..639A - Astronomy and Astrophysics, volume 399, 639-645 (2003/2-4)

Spectroscopic mode identification for the β Cephei star EN(16) Lacertae.

AERTS C., LEHMANN H., BRIQUET M., SCUFLAIRE R., DUPRET M.-A., DE RIDDER J. and THOUL A.

Abstract (from CDS):

We perform for the first time spectroscopic mode identification in the eclipsing binary βCephei star EN(16) Lac. This mode identification is based upon a time series of 942 line profiles of the HeIλλ6678Å line in its spectrum. All three known frequencies f1, f2, f3 of the star are present in the line-profile variations, but we failed to find additional modes. Using different identification methods we find conclusive evidence for the radial nature of the main mode and for the l=2, m=0 identification of the mode with frequency f2. A unique identification of the third mode is not possible from the spectra, but we do derive that l3<3. Fits to the amplitude and phase variability of the modes imply a rotation frequency between 0.1 and 0.4c/d. The star's rotation axis is not aligned with the orbital axis.

Abstract Copyright:

Journal keyword(s): stars: binaries: spectroscopic - stars: variables: early-type - stars: individual: EN(16) Lac

Simbad objects: 5

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Number of rows : 5
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 * bet Cru bC* 12 47 43.26877 -59 41 19.5792 0.03 1.02 1.25 1.38 1.64 B1IV 333 0
2 * nu. Cen SB* 13 49 30.2764388 -41 41 15.752069 2.31 3.188 3.386     B2IV 188 0
3 * bet Cen bC* 14 03 49.40535 -60 22 22.9266     0.58     B1III 351 0
4 * ome Sco bC* 16 06 48.4269211 -20 40 09.090235 3.10 3.92 3.97 3.91 3.99 B1V 455 0
5 * 16 Lac bC* 22 56 23.6299283136 +41 36 13.948480440 4.61 5.436 5.587     B2IV 303 0

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2022.05.24-11:41:59

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