2004A&A...427..581U


C.D.S. - SIMBAD4 rel 1.7 - 2020.09.22CEST14:39:49

2004A&A...427..581U - Astronomy and Astrophysics, volume 427, 581-592 (2004/11-4)

Interpretation of the variability of the β Cephei star λ Scorpii. I. The multiple character.

UYTTERHOEVEN K., WILLEMS B., LEFEVER K., AERTS C., TELTING J.H. and KOLB U.

Abstract (from CDS):

We derive accurate values of the orbital parameters of the close binary β Cephei star λ Scorpii. Moreover, we present the first determination of the properties of the triple system to which λ Scorpii belongs. Our analysis is based on a time series of 815 high-resolution spectra, covering a timespan of 14 years. We find a close orbit of 5.9525 days (e=0.26) and a wide orbit of approximately 1082 days (e=0.23). The orbital parameters of the triple star and a spectrum synthesis lead us to conclude that the system is composed of two early-type B stars and a low-mass pre-main-sequence star rather than containing an ultra-massive white dwarf as claimed before. Our proposed configuration is compatible with population synthesis. The radial velocity variations of the primary allow us to confirm the presence of at least one pulsation mode with frequency 4.679410c/d which is subject to the light-time effect in the triple system. A detailed analysis of the complex line-profile variations is described in a subsequent paper.

Abstract Copyright:

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

Simbad objects: 11

goto Full paper

goto View the reference in ADS

Number of rows : 11

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 * psi02 Ori bC* 05 26 50.2291316549 +03 05 44.417664333 3.45 4.398 4.611     B2IV 193 0
2 HD 49798 HXB 06 48 04.7000758397 -44 18 58.432035331 6.758 8.017 8.287 8.391 8.543 sdO6 285 0
3 * alf Vir bC* 13 25 11.57937 -11 09 40.7501 -0.20 0.74 0.97 1.06 1.30 B1V 820 2
4 * nu. Cen SB* 13 49 30.2764388 -41 41 15.752069 2.31 3.188 3.386     B2IV 180 0
5 * bet Cen bC* 14 03 49.40535 -60 22 22.9266     0.58     B1III 346 0
6 * nu. Sco ** 16 11 59.73568 -19 27 38.5361 3.42 4.05 4.00 3.90 3.87 B2V 356 0
7 NAME Upper Sco Association As* 16 12 -23.4           ~ 1048 1
8 * sig Sco bC* 16 21 11.3157134 -25 35 34.051476 2.32 3.02 2.89 1.69 1.58 O9.5(V)+B7(V) 827 0
9 * lam Sco bC* 17 33 36.52012 -37 06 13.7648 0.52 1.48 1.62     B2IV+DA7.9 374 1
10 HD 177863 SB* 19 07 08.3281460860 -18 44 17.402016979   6.243 6.293     B8V 68 0
11 V* CK Ind gD* 22 04 38.4299738040 -64 43 42.007848070   7.57 7.32     A9/F0V-IV 78 0

    Equat.    Gal    SGal    Ecl

To bookmark this query, right click on this link: simbad:objects in 2004A&A...427..581U and select 'bookmark this link' or equivalent in the popup menu


2020.09.22-14:39:49

© Université de Strasbourg/CNRS

    • Contact