Optical observations of Eta Carinae at La Plata Observatory
The eclipsing binary system Tr16-1

Update: Feb 22, 2017

We have presented an analysis of photometric and spectroscopic observations of this eclipsing binary system in the Annual Meeting 2003 of the Asociación Argentina de Astronomía. (Spanish ps-file 450Kb)

Tr 16-1 (= CPD -59o2628) is a star with spectral type O9, it's one of the brightest stars in the inmediate neighbourhood of Eta Carinae (labeled with the number 3 in the image of the right).
We have determined its differential photometry using HDE303308 (number 2 in the figure) as comparison star. Here, we present the light curves (B, V, R, I) obtained with the Reflector telescope at La Plata Observatory (OALP), during the international campaign of Eta Carinae.

The images are acquired through Johnson-Cousins BVRI filters with a Photometrics STAR I CCD camera attached to the 0.8-m reflector (f/20.06 Cassegrain) at La Plata Observatory, Argentina. The detector used is a Thomson-CSF TH7883 scientific-grade front-illuminated chip, Peltier cooled, of 384 x 576 pixels (23 microns square pixel). The instrumental configuration results in 1'.9 x 2'.8 field images. BVRI passbands used are those recommended by Bessell (1990) for coated CCDs.

Differential photometry of Tr16-1 minus HDE 303308. Orbital phases were calculated with the following ephemeris: 2,450,456.8164+1.4693316E days (Freyhammer et al., 2001).

Residuals from the comparisson of the V observations of Tr16-1 with a Wilson-Devinney model, which was obtained using the physical parameters given by Freyhammer et al., 2001, as a function of phase and julian day respectively.

  • η Car working group
    Optical observations of Eta Carina

  • Web-page: Martín Schwartz, Eduardo Fernández Lajús & Roberto Gamen