The central star of planetary nebula LT-5 - A triple system

Journal Article · Sat Jun 01 04:00:00 EDT 1991 · Astronomical Journal; (United States)

DOI:https://doi.org/10.1086/115834· OSTI ID:5393723

Malasan, H L; Yamasaki, Atsuma; Kondo, Masayuki ^[1]

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1. Tokyo, University (Japan) Bosscha Observatory (Japan) Bandung Institute of Technology (Indonesia) Tokyo, University, Mitaka (Japan)

IN Com, the central star of the planetary nebula LT-5, is concluded to be a triple system as a result of photometric and spectroscopic examination. Data from UBV photometric and high-dispersion spectroscopic studies conducted between 1984 and 1989 are analyzed by means of a light curve and radial velocity studies. The radial velocity studies show that a single-lined binary with a period of 1.7545 days comprises the inner system. Further analysis reveals that it is an evolved G-type star with an active chromosphere. The G star has a low-mass companion, and the third body is a hot subdwarf that excites the surrounding planetary nebula. A change in the observed systemic velocities with a period of approximately 2000 days points toward the existence of the third body. Photospheric and chromospheric disturbances on the surface of the G star account for the changeable period of light variance on the central star. The masses of all the components are calculated, and the rotational velocity of the primary component and the orbital inclination of the inner system are determined. The statistical relation between distance and apparent diameter for nebulae of this type suggests that the distance d = 100-170 pc is accurate. 26 refs.

• OSTI ID: 5393723
• Journal Information: Astronomical Journal; (United States), Journal Name: Astronomical Journal; (United States) Vol. 101; ISSN 0004-6256; ISSN ANJOA
• 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
ATMOSPHERES
BINARY STARS
DISTANCE
DWARF STARS
MASS
NEBULAE
ORBITS
PLANETARY NEBULAE
RADIAL VELOCITY
SPECTROPHOTOMETRY
STARS
STELLAR ACTIVITY
STELLAR ATMOSPHERES
VELOCITY