Stars: Binaries: Spectroscopic; Stars: Fundamental Parameters; Stars: Variables: Other
Abstract :
[en] We have obtained extensive spectroscopic and velocity spectrometer observations of HD 166181, a previously known single-lined spectroscopic binary. Our improved orbit for the G6 V primary has a period of 1.8098343 days and is circular. Although the lines of additional components have not been detected, radial velocity measurements confirm that the system has additional velocity variations with a period of 2092 days, or 5.73 yr. This long-period orbit has an eccentricity of 0.76. An analysis of the Hipparcos observations produces a well-determined astrometric orbit for the long-period system that has an inclination of 78°. Mass estimates of the components in this zero-age main-sequence multiple system indicate that the unseen secondary in the 5.73 yr orbit may also be a binary. Thus, HD 166181 is at least a triple system and possibly quadruple.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Fekel, Francis C.; Center of Excellence in Information Systems, Tennessee State University, 330 10th Avenue North, Nashville, TN 37203
Barlow, D. J.; Department of Physics and Astronomy, University of Victoria, Victoria, BC V8W 3P6, Canada scarfe@uvic.ca
Scarfe, C. D.; Department of Physics and Astronomy, University of Victoria, Victoria, BC V8W 3P6, Canada scarfe@uvic.ca
Jancart, Sylvie ; Université de Liège - ULiège > Architecture Site Lambert Lombard > Architecture Site Lambert Lombard
Pourbaix, D.; Institut d'Astronomie et d'Astrophysique, Université Libre de Bruxelles, C.P. 226, Boulevard du Triomphe, 1050 Brussels, Belgium sja@astro.ulb.ac.be)
Language :
English
Title :
HD 166181 = V815 Herculis, a Single-lined Spectroscopic Multiple System
Publication date :
01 February 2005
Journal title :
Astronomical Journal
ISSN :
0004-6256
eISSN :
1538-3881
Publisher :
Univ Chicago Press, Chicago, United States - Illinois
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