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HD 155454


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CCD measurements of visual binaries
CCD measurements of visual double stars were obtained with the ESO 1.5 mdanish reflector. All binaries observed are candidates for the HIPPARCOSInput Catalogue. More than 400 observations have been made in four clearnights. The accuracy obtained is comparable to the accuracy of thephotographic technique, but the observing and reduction times are oneorder of magnitude smaller.

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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Osservazione e dati astrometrici

Costellazione:Ottante
Ascensione retta:17h28m43.99s
Declinazione:-82°46'46.6"
Magnitudine apparente:6.635
Distanza:478.469 parsec
Moto proprio RA:-0.3
Moto proprio Dec:-2.4
B-T magnitude:6.507
V-T magnitude:6.625

Cataloghi e designazioni:
Nomi esatti   (Edit)
HD 1989HD 155454
TYCHO-2 2000TYC 9522-4293-1
USNO-A2.0USNO-A2 0000-01513115
HIPHIP 85530

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