J/A+A/309/521 55 UMa spectroscopic orbit (Horn+, 1996)
Spectroscopic orbit of the triple star 55 Ursae Majoris.
Horn J., Kubat J., Harmanec P., Koubsky P., Hadrava P., Simon V.,
Stefl S., Skoda P.
<Astron. Astrophys. 309, 521 (1996)>
=1996A&A...309..521H 1996A&A...309..521H (SIMBAD/NED BibCode)
ADC_Keywords: Binaries, spectroscopic ; Binaries, orbits ; Radial velocities
Keywords: stars: binaries: spectroscopic - stars: individual: 55 UMa -
stars: fundamental parameters
Description:
The first investigation of the known triple system 55 UMa (2.55d
binary in a ∼1870-d orbit with the third star) based on electronic
spectra led to several new findings about the system: (1) Discovery of
spectral lines of the tertiary and an unambiguous detection of the
lines of the secondary. Spectra of both primary and tertiary are of
the same strength and correspond to spectral class A0V. The secondary
spectrum is about twice fainter in the visual region and belongs
probably also to spectral class A. (2) First self-consistent orbital
solution describing close and wide orbit and the detection of apsidal
motion for the close pair. The orbital period of the close pair was
improved to (2.5538380±0.0000046d) and basic physical elements for
all three stars and the system were estimated. The orbital solution
also gives the period of apsidal motion of the close pair of
(450±60)yr and leads to a good agreement with the published
speckle-interferometric orbit for the distant companion if the
longitude of periastron passage is increased by 180deg.
Objects:
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RA (2000) DE Designation(s)
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11 19 08 +38 11 11 55 UMa = HD 98353 = HR 4380 = BD +38 2225
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1 72 45 Radial velocities of 55 UMa
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Byte-by-byte Description of file: table1
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Bytes Format Units Label Explanations
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1- 8 A8 --- Inst Instrument (1)
9- 21 F13.4 d HJD Heliocentric Julian date
23- 27 F5.1 km/s RV1a Primary radial velocity from all lines
30- 34 F5.3 --- w1a Weight of the particular radial velocity RV1a
36- 40 F5.1 km/s RV1 []? Primary radial velocity from CaI line
43- 47 F5.3 --- w1 []? Weight of the particular radial velocity RV1
50- 54 F5.1 km/s RV2 []? Secondary radial velocity from CaI line
57- 61 F5.3 --- w2 []? Weight of the particular radial velocity RV2
64- 72 A9 A W Wavelength range
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Note (1): AUR: Aurelier spectrograph
RET: Reticon in Coude spectrograph
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(End) Patricia Bauer [CDS] 08-Feb-1996