Access to Astronomical Catalogues

← Click to display the menu
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 (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: ---------------------------------------------------------------------- RA (2000) DE Designation(s) ---------------------------------------------------------------------- 11 19 08 +38 11 11 55 UMa = HD 98353 = HR 4380 = BD +38 2225 ---------------------------------------------------------------------- File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1 72 45 Radial velocities of 55 UMa
Byte-by-byte Description of file: table1
Bytes Format Units Label Explanations
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
Note (1): AUR: Aurelier spectrograph RET: Reticon in Coude spectrograph

(End) Patricia Bauer [CDS] 08-Feb-1996
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

catalogue service

© UDS/CNRS

Contact