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Astron. Astrophys. 315, L213-L216 (1996)

ISOCAM imaging of AG Car and HR Car*

N.R. Trams1, L.B.F.M. Waters2, and R.H.M. Voors3

1 ISO Science Operations, ESA-VILSPA Satellite Tracking station, Villafranca de Castillo, Madrid, Spain
2 Astronomical Institute, University of Amsterdam, Amsterdam, The Netherlands
3 Astronomical Institute, University of Utrecht, Utrecht, The Netherlands

Received 17 July 1996 / Accepted 19 August 1996

Abstract. We present infrared images obtained with the ISOCAM instrument on board the Infrared Space Observatory of two Luminous Blue Variables (AG Car and HR Car). The images were obtained at eight wavelengths between 8.5 and 16 img1.gifm using the Circular Variable Filters (CVFs), with a pixel size of 6 by 6 arcsec and a total field of view of 192 by 192 arcsec. The nebula around AG Car is clearly resolved. The nebula is particularly strong in the [Ne II] emission line and at the longer wavelengths in the continuum. Using these images independent spectral energy distributions are obtained of the star and the nebula. The spectral energy distribution indicates that most of the infrared radiation in AG Car originates in the extended nebula, and may be due to thermal radiation of dust in the nebula. In fact most of the IR radiation of this object longward of 10 img1.gifm originates in the nebula. The star HR Car is not clearly resolved, although the spectra calculated by adding the pixels show some marked differences between the spectrum of the central pixel and the area around the central pixel, indicating the presence of extended emission also in this object.

Key words: stars: imaging - stars: circumstellar matter - stars: early type; infrared: stars

* Based on observations with ISO, an ESA project with instruments funded by the ESA member states (especially the PI countries: France, Germany, the Netherlands and the United Kingdom) and with the participation of ISAS and NASA.

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