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HD 140022


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A study of visual double stars with early type primaries. IV Astrophysical data
Astrophysical parameters (MK class, color excess, absolute magnitude,distance, effective temperature, mass, and age) are derived fromcalibrations of the uvby-beta indices for the members of 253 doublestars with O or B type primaries and faint secondaries. The photometricspectral classification is compared to the MK classes, and the agreementis very good. The derived data together with spectroscopic and JHKL dataare used for deciding which pairs are likely to be physical and whichare optical, and it is shown that 98 (34 percent) of the secondaries arelikely to be members of physical systems. For 90 percent of the physicalpairs the projected separation between the components is less than25,000 AU. A majority of the physical secondaries are late-type stars,and 50 percent of them are contracting towards the zero-agemain-sequence. Also presented are new uvby-beta data for 43 secondariesand a computer program for determining astrophysical parameters fromuvby-beta data.

A study of visual double stars with early type primaries. II - Photometric results
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1983A&AS...51..161L&db_key=AST

A study of visual double stars with early type primaries. I - Spectroscopic results
Attention is given to spectral peculiarities found in data on thespectral classes of 486 stars in 254 visual doublet or multiplet systemswith O or B type primaries, in order to isolate a group of very youngstars that may serve for the study of early stellar evolutioncharacteristics. It is noted that the material contains a substantialfraction of secondaries that are likely to be physical, and that severalof these may be in the premain-sequence phase of stellar evolution, orhave reached the zero-age main sequence.

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Gözlemler ve gökölçümü verileri

Takýmyýldýz:Cennet Kusu
Sað Açýklýk:15h47m06.91s
Yükselim:-72°26'37.2"
Görünürdeki Parlaklýk:9.126
Uzaklýk:680.272 parsek
özdevim Sað Açýklýk:1.4
özdevim Yükselim:-7.7
B-T magnitude:9.067
V-T magnitude:9.122

Kataloglar ve belirtme:
Özgün isimleri
HD 1989HD 140022
TYCHO-2 2000TYC 9268-955-1
USNO-A2.0USNO-A2 0150-15528016
HIPHIP 77320

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