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HD 151554


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Radial-velocity measurements. V - Ground support of the HIPPARCOS satellite observation program
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The local interstellar medium and soft local X-ray radiation
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This study presents new high-dispersion CCD spectra of sodium for eightprogram stars located in the direction of the high-latitude Dracomolecular cloud (DMC). The derived lower distance limit of 180 pc abovethe Galactic plane was evaluated from nondetection of interstellarabsorption lines of sodium at the Draco velocity in sight lines of B8-F0type stars. This result is in agreement with former distance estimatesfrom star counts as well as from UBV photometric extinctionmeasurements. The existence of the most negative velocity components inspectra of the most distant stars suggests a more speculative distanceestimate of 400-600 pc for the DMC. The present determination of a lowerdistance limit to the DMC from an interstellar absorption-line studysupplements the few existing optical determinations of firm (upper)distance limits to other high-latitude molecular clouds.

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Datos observacionales y astrométricos

Constelación:Dragón
Ascensión Recta:16h44m17.56s
Declinación:+60°58'14.5"
Magnitud Aparente:7.89
Distancia:148.588 parsecs
Movimiento Propio en Ascensión Recta:-3
Movimiento Propio en Declinación:12.5
B-T magnitude:8.054
V-T magnitude:7.904

Catálogos y designaciones:
Nombres Propios   (Edit)
HD 1989HD 151554
TYCHO-2 2000TYC 4190-2439-1
USNO-A2.0USNO-A2 1500-06136891
HIPHIP 81940

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