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HD 140367


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Публикации по объекту

New periodic variables from the Hipparcos epoch photometry
Two selection statistics are used to extract new candidate periodicvariables from the epoch photometry of the Hipparcos catalogue. Theprimary selection criterion is a signal-to-noise ratio. The dependenceof this statistic on the number of observations is calibrated usingabout 30000 randomly permuted Hipparcos data sets. A significance levelof 0.1 per cent is used to extract a first batch of candidate variables.The second criterion requires that the optimal frequency be unaffectedif the data are de-trended by low-order polynomials. We find 2675 newcandidate periodic variables, of which the majority (2082) are from theHipparcos`unsolved' variables. Potential problems with theinterpretation of the data (e.g. aliasing) are discussed.

The Scorpius OB2 Complex
The Sco OB2 complex is a member of the Local Association. Theassociation contains pre-main-sequence stars in addition to objects some3 x 10^7 yr old. If it is assumed that stars in wide binaries arecoeval, then the He-weak variables in the supercluster arepre-main-sequence, elevated above that sequence by an amount similar tothat of the 3 x 10^7 yr old, normal stars but contracting toward thesequence, not evolving from it. The apparent great depth of theassociation is probably a result of some foreground superclustermembers, superposed on Sco OB2, and a rift in the absorption cloudbetween Scorpius and Ophiuchus. The adjoining Chamaeleon complex alsoappears to be a member of the supercluster.

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Наблюдательные данные и астрометрия

Созвездие:Змея
Прямое восхождение:15h42m30.90s
Склонение:+20°35'55.5"
Видимая звёздная величина:8.261
Расстояние:311.526 парсек
Собственное движение RA:-24.7
Собственное движение Dec:14.2
B-T magnitude:10.27
V-T magnitude:8.427

Каталоги и обозначения:
Собственные имена
HD 1989HD 140367
TYCHO-2 2000TYC 1501-459-1
USNO-A2.0USNO-A2 1050-07600307
HIPHIP 76928

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