eta CARINAE

DAMINELI A.; ET AL.; FERNÁNDEZ LAJÚS E.

IAU Circular

International Astronomical Union, Central Bureau for Astronomical Telegrams

Lugar: Cambridge; Año: 2008 vol. 8967 p. 1 - 1

0081-0304

A. Damineli -- on behalf of a large team monitoring eta Carspectroscopicaly at the Observatories of Pico dos Dias (Brazil),Casleo (Argentina), Las Campanas, and European Southern Observatory,La Silla -- reports measurements in the He II 468.6-nm emission line.The equivalent width was 0.009 nm at epochs 2007.3 and 2007.6, 0.012nm at 2008.3, and 0.021 nm at 2008.6 -- repeating very well the pastcycle, as reported by Steiner and Damineli (2004, Ap.J. 612, L133).The fact that the line-intensity curve follows the x-ray light curveindicates that the He II emitting region is associated with thewind-wind collision shock and not driven by a sudden shell ejection.For related information, see also Damineli et al. 2008,MNRAS 386, 2330.