THE ORBIT OF THE CLASSICAL CEPHEID U AQUILAE

A total of 62 new radial-velocity observations ofthe classical Cepheid U Aql have been obtained during the interval 1969-86. We present the first determination of a spectroscopic binary orbit for this star. The orbital elements derived from both new and published velocities are: P= 1856.4 ± 4.3 days...

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Published in:Publications of the Astronomical Society of the Pacific 1987-07, Vol.99 (617), p.610-616
Main Authors: WELCH, DOUGLAS L., EVANS, NANCY R., LYONS, RON W., HARRIS, HUGH C., BARNES, THOMAS G., SLOVAK, MARK H., MOFFETT, THOMAS J.
Format: Article
Language:English
Subjects:
Astronomy
Cepheids
Cepheids (delta cephei, w virginis)
Earth, ocean, space
Ephemerides
Exact sciences and technology
Observatories
Orbital elements
Orbital evolution
Orbital velocity
Phase shift
Radial velocity
Stars
Telescopes
Variable and peculiar stars (including novae)
Wavelengths
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container_issue 617
container_start_page 610
container_title Publications of the Astronomical Society of the Pacific
container_volume 99
creator WELCH, DOUGLAS L.
EVANS, NANCY R.
LYONS, RON W.
HARRIS, HUGH C.
BARNES, THOMAS G.
SLOVAK, MARK H.
MOFFETT, THOMAS J.
description A total of 62 new radial-velocity observations ofthe classical Cepheid U Aql have been obtained during the interval 1969-86. We present the first determination of a spectroscopic binary orbit for this star. The orbital elements derived from both new and published velocities are: P= 1856.4 ± 4.3 days K1 = 7.81 ± 0.22 km s−1 γ =1.15 ± 0.15 km s−1 e = 0.165 ± 0.027 ω = 190.5 ± 7.7 deg T = 2442754 ± 38 JD a1 sin i = 196.7 ± 5.5 Gm = 1.311 ± 0.037 AU f(m) = 0.0881 ± 0.0074 M⊙ IUE observations reported by Böhm-Vitense and Proffitt (1985) indicate the presence of an early-type main-sequence companion. The orbital elements combined with estimates ofthe companion mass result in upper limits for the mass of the Cepheid in the range 6.4-8.8 M⊙. The possibility of spatially resolving the system using interferometric techniques is discussed.
doi_str_mv 10.1086/132022
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source JSTOR Archival Journals; Institute of Physics:Jisc Collections:IOP Publishing Read and Publish 2024-2025 (Reading List)
subjects Astronomy
Cepheids
Cepheids (delta cephei, w virginis)
Earth, ocean, space
Ephemerides
Exact sciences and technology
Observatories
Orbital elements
Orbital evolution
Orbital velocity
Phase shift
Radial velocity
Stars
Telescopes
Variable and peculiar stars (including novae)
Wavelengths
title THE ORBIT OF THE CLASSICAL CEPHEID U AQUILAE
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