We present prelimiary results from a coordinated spectroscopic campaign in 2011, centered on the \delta Sco periastron passage in July. Data have mostly been obtained with the FEROS/2.2 m at La Silla and ESPaDOnS/CFHT at Mauna Kea echelle instruments. Main results include the absence of tidally induced disturbance to the main \beta Cephei pulsation mode and the absence of tidally triggered mass-ejection at time of periastron proper. The observed (as far as yet analyzed) variations are compatible with the picture of a disk that is disturbed on its outer radius, with the disturbance propagating inwards after the periastron.
@article{arxiv.1210.0370,
title = {Spectroscopic Observations of \delta Sco Through the 2011 Periastron Passage},
author = {Th. Rivinius and S. Štefl and D. Baade and A. C. Carciofi and S. Otero and A. S. Miroshnichenko and N. Manset},
journal= {arXiv preprint arXiv:1210.0370},
year = {2012}
}
Comments
Presented in "Circumstellar Dynamics at High Resolution", Foz do Igua\c{c}u, Brazil, February 27 - March 02, to appear in 2012, ASP Conf. Series 464, in press