FG Sagittae - No hot companion
- NASA, Goddard Space Flight Center, Greenbelt, MD (USA) Catholic Univ. of America, Washington, DC (USA)
The nucleus of the planetary nebula He 1-5 (= PK 60 -7 deg 1), the variable star FG Sge, was observed with the SWP camera of the International Ultraviolet Explorer satellite to detect a hot companion of the star, if such a companion exists. The observation found no evidence for the existance of a hot companion in the 1200-2000 A range of the SWP camera and supported the contention that FG Sge underwent a helium shell flash during the past century, and that the surrounding nebula, He 1-5, is a nebula of fossil ionization. Despite the currently accepted fossil ionization model, constraints posed by the satellite detection limit, the observed H-beta flux, and the adopted radii for white dwarfs still allow the possibility of a putative hot companion photoionizing this nebula. 21 refs.
- OSTI ID:
- 6440519
- Journal Information:
- Astronomical Journal; (USA), Journal Name: Astronomical Journal; (USA) Vol. 100; ISSN 0004-6256; ISSN ANJOA
- Country of Publication:
- United States
- Language:
- English
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