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HD 232383


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Tertiary companions to close spectroscopic binaries
We have surveyed a sample of 165 solar-type spectroscopic binaries (SB)with periods from 1 to 30 days for higher-order multiplicity. Asubsample of 62 targets were observed with the NACO adaptive opticssystem and 13 new physical tertiary companions were detected. Anadditional 12 new wide companions (5 still tentative) were found usingthe 2MASS all-sky survey. The binaries belong to 161 stellar systems; ofthese 64 are triple, 11 quadruple and 7 quintuple. After correction forincompleteness, the fraction of SBs with additional companions is foundto be 63% ± 5%. We find that this fraction is a strong functionof the SB period P, reaching 96% for P<3d and dropping to34% for P>12^d. Period distributions of SBs with and withouttertiaries are significantly different, but their mass ratiodistributions are identical. The statistical data on the multiplicity ofclose SBs presented in this paper indicates that the periods and massratios of SBs were established very early, but the periods of SB systemswith triples were further shortened by angular momentum exchange withcompanions.

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관측 및 측정 데이터

별자리:카시오페이아자리
적경:01h09m33.40s
적위:+51°34'37.8"
가시등급:8.447
거리:170.358 파섹
적경상의 고유운동:23.9
적위상의 고유운동:0
B-T magnitude:9.812
V-T magnitude:8.56

천체목록:
일반명   (Edit)
HD 1989HD 232383
TYCHO-2 2000TYC 3276-307-1
USNO-A2.0USNO-A2 1350-01137559
HIPHIP 5436

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