Cyclicities in the light variations of LBVs. I. The multi-periodic behaviour of the LBV candidate ζ^1^ Sco.

Details Cyclicities in the light variations of LBVs. I. The multi-periodic behaviour of the LBV candidate ζ^1^ Sco. Cyclicities in the light variations of LBVs. I. The multi-periodic behaviour of the LBV candidate ζ^1^ Sco.

Oct 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997a%26a...326..640s&link_type=abstract

Astronomy and Astrophysics, v.326, p.640-646

Astronomy and Astrophysics

Astrophysics

20

Stars: Variables, Stars: Oscillations, Stars: Lbvs, Stars: Individual: {Zeta}^1^ Sco, Techniques: Photometric

Scientific paper

Differential Stroemgren uvby photometry of ζ^1^ 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during the time interval 1982-1995 is analysed together with new VBLUW photometry with a complementary discussion of unpublished JHKLM data.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 f_1_=0.03155 (P~32days) and a possible second frequency f_2_~5/4 f_1_ ~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 ζ^1^ 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 ζ^1^ Sco should be regarded as a candidate Luminous Blue Variable.

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