SIMBAD references

1997A&A...326..640S - Astronomy and Astrophysics, volume 326, 640-646 (1997/10-2)

Cyclicities in the light variations of LBVs. I. The multi-periodic behaviour of the LBV candidate ζ1 Sco.

STERKEN C., DE GROOT M. and VAN GENDEREN A.M.

Abstract (from CDS):

Differential Stroemgren uvby photometry of ζ1 Sco collected during the time interval 1982-1995 is analysed together with new VBLUW photometry with a complementary discussion of unpublished JHKLM data. We report the discovery of a ∼1750-2200d regular oscillation of amplitude ∼0.01mag in all bands, and pulsation-like oscillations with at least one frequency f1=0.03155 (P∼32days) and a possible second frequency f2∼5/4 f1 ∼0.03891 (P∼25.7 days). Most likely, all such stars exhibit multi-periodic light variability. A strong noise component remaining in the prewhitened signal leads us to postulate that the driver for LBV-like eruptions is stochastic resonance. This hypothesis is supported by the historic light curve of ζ1 Sco which shows that two centuries ago the star was about 2 magnitudes brighter, while a millenium ago it was only 1 magnitude brighter than today, an indication that ζ1 Sco should be regarded as a candidate Luminous Blue Variable.

Abstract Copyright:

Journal keyword(s): stars: variables - stars: oscillations - stars: LBVs - stars: individual: ζ1 Sco (HD 152236) - techniques: photometric

Simbad objects: 7

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2020.09.25-03:54:56

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