2001A&A...371.1035U


Query : 2001A&A...371.1035U

2001A&A...371.1035U - Astronomy and Astrophysics, volume 371, 1035-1047 (2001/6-1)

Line-profile variations of the double-lined spectroscopic binary κ Scorpii.

UYTTERHOEVEN K., AERTS C., DE CAT P., DE MEY K., TELTING J.H., SCHRIJVERS C., DE RIDDER J., DAEMS K., MEEUS G. and WAELKENS C.

Abstract (from CDS):

We present a total time series of high signal-to-noise, high-resolution spectra of the SiIII λ4552.6, λ4567.8 and λ4574.8Å lines of the fast-rotating, spectroscopic binary and β Cephei star κ Scorpii. Among this data set is a sample of 422 spectra of intensive monitoring during eight subsequent nights in July 1997. We find variability of the line profiles on two time-scales: a variation of several months as a result of the orbital motion and rapid variations of a few hours, which are explained in terms of non-radial pulsation modes. From the total dataset, covering a time span of 9 years, we derive for the first time the orbital parameters of κ Scorpii and find an orbital period of 195 days. The complex patterns on the grayscale representations of the residual SiIII λ4552.6Å profiles with respect to the average profile point towards more than one (non-axisymmetric) pulsation mode. A frequency analysis of the three normalised velocity moments confirms the main period of 4.80 hours and the second period of 4.93 hours, which were previously derived from photometric data. We attempt an identification of the pulsation modes by means of the moment method and line-profile fitting and find that κ Scorpii pulsates in a main prograde sectoral mode of degree 1 or 2 and in an additional tesseral mode for which l=5, m=1 are the most likely wavenumbers. In the variations of the line profiles we find indications for the presence of additional pulsation modes.

Abstract Copyright:

Journal keyword(s): stars: binaries: spectroscopic - stars : oscillations - line: profiles - stars: individual: κ Scorpii

Simbad objects: 6

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Number of rows : 6
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 * eps Per bC* 03 57 51.2320472 +40 00 36.775143 1.71 2.71 2.89 2.96 3.14 B1.5III 508 0
2 * alf Vir bC* 13 25 11.57937 -11 09 40.7501 -0.20 0.74 0.97 1.06 1.30 B1V 842 2
3 * nu. Cen bC* 13 49 30.2764388 -41 41 15.752069 2.31 3.188 3.386     B2IV 188 0
4 * ome Sco bC* 16 06 48.4269211 -20 40 09.090235 3.10 3.92 3.97 3.91 3.99 B1V 458 0
5 * lam Sco bC* 17 33 36.52012 -37 06 13.7648 0.52 1.49 1.63     B2IV+DA7.9 380 0
6 * kap Sco bC* 17 42 29.27520 -39 01 47.9391 1.32 2.211 2.386     B1.5III 233 0

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2022.08.15-02:42:12

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