A spectroscopic study of the three symbiotic stars He 2-171, Ap 1-9, and Ap 1-11

Journal Article · Sat Jun 01 04:00:00 EDT 1991 · Publications of the Astronomical Society of the Pacific; (United States)

DOI:https://doi.org/10.1086/132854· OSTI ID:5318769

Kaler, J B; Hayes, J; Bell, D; Stanghellini, L ^[1]

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1. Illinois, University, Urbana (USA)

Line intensities of the symbiotic stars He 2-171, Ap 1-9, and Ap 1-11 between 3700 A and 6900 A have been measured; He 2-171 has a particularly rich spectrum filled with the usual forbidden iron lines. Densities estimated from auroral-to-nebular line ratios are high, 2 {times} 10 to the 6th and 4 x 10 to the 7th/cu cm from forbidden O III for He 2-171 and Ap 1-9, respectively, and 300,000 from forbidden N II for He 2-171, while the nebular forbidden S II ratio gives a much lower density for He 2-171 of 10,000, typical of symbiotic behavior. Comparison with other observations of He 2-171 strongly indicates physical changes in the system over a four-year period. The spectrum of Ap 1-9 has a strong underlying continuum with TiO bands, indicating the presence of an M star. 28 refs.

• OSTI ID: 5318769
• Journal Information: Publications of the Astronomical Society of the Pacific; (United States), Journal Name: Publications of the Astronomical Society of the Pacific; (United States) Vol. 103; ISSN PASPA; ISSN 0004-6280
• Country of Publication: United States
• Language: English

Related Subjects

640102* -- Astrophysics & Cosmology-- Stars & Quasi-Stellar
Radio & X-Ray Sources
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
COMPARATIVE EVALUATIONS
EMISSION SPECTRA
EVALUATION
LUMINOSITY
OPTICAL PROPERTIES
PHYSICAL PROPERTIES
SPECTRA
SPECTROPHOTOMETRY
SPECTROSCOPY
STARS
SYMBIOTIC STARS