Near-infrared photometry of the final helium shell flash object V4334 Sagittarii

Abstract

JHK photometry of the final helium shell flash object V4334 Sagittarii undertaken during 1996–97 is presented in this paper. The data reveal the formation of circumstellar dust of temperature ∼ 1800 K two years after outburst. Around 5 × 10−10 M⊙ of dust condensed at a distance of about 7R⊬ from the star. The mass of V4334 Sgr is 0.8 M⊙ and it had a radius of ∼ 70 R⊙ in 1997 April–May.