C.D.S. - SIMBAD4 rel 1.7 - 2020.08.14CEST07:48:50

2001A&A...369..908C - Astronomy and Astrophysics, volume 369, 908-914 (2001/4-3)

Contribution to the search of binaries among Am stars. II. HD 81976 and HD 98880, double-lined spectroscopic binaries.


Abstract (from CDS):

We present the results of the observations of two Am stars of eighth magnitude, the double-lined spectroscopic binaries HD 81976 and HD 98880, carried out with the CORAVEL instrument at the Observatoire de Haute-Provence in order to determine their orbital elements. We found 1) for HD 81976: P=5.655750 days, T=2449785.941 HJD, ω=341.4°, e=0.061, K1=61.68km/s, K2=63.84km/s, V0=19.85km/s, a1sin(i)=4.788Gm, a2sin(i)=4.956Gm, M1sin3(i)=0.5875M, M2sin3(i)=0.5676M, and 2) for HD 98880: P=14.20783 days, T0=2448682.883 HJD (ascending node), e=0., K1=42.47km/s, K2=49.16km/s, V0=2.40km/s, a1sin(i)=8.298Gm, a2sin(i)=9.604Gm, M1sin3(i)=0.6091M, M2sin3(i)=0.5262M. The first of these two systems, HD 81976, is formed by two quasi-identical stars, and the Hipparcos data (MV, B-V) are consistent with late A stars in effective temperature; it is likely that the components rotate synchronised with the orbital motion. A third body may be present in this system since (i) the orbit has a significant eccentricity despite its short period and (ii) the systemic velocity V0 shows a possible drift. For the second system, HD 98880, we give ΔmB=1.25 and we propose a simple model based upon Stroemgren photometric indices and the HR theoretical diagram of Schaller et al (1992A&AS...96..269S) in addition to orbital parameters and Hipparcos data: Teff=7000K, log10g=4.0, M1=1.9M, M2=1.6M, log10(age)=9.12. The components do not rotate synchronously contrary to HD 81976. Both binaries appear to be detached systems without possibility of eclipses.

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Journal keyword(s): stars: individual: HD 81976, HD 98880 - binaries: spectroscopic - stars: fundamental parameters

Simbad objects: 2

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Number of rows : 2

N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
1 HD 81976 SB* 09 30 02.1656883403 +33 18 21.168225310   8.44 8.18     A0 12 0
2 HD 98880 SB* 11 22 51.9758499801 +44 49 28.127873729   8.42 8.02     A5 26 0

    Equat.    Gal    SGal    Ecl

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