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HD 121796


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A homogeneous catalog of new UBV and H-beta photometry of B- and A-type stars in and around the Scorpius-Centaurus OB association
B- and A-type stars in and near the Sco-Cen OB association areinvestigated with UBV and H-beta photometry to acquire data relevant tothe luminosity function of Sco-Cen. The measurements generally consistof two 10-s integrations of U, B, V, (W, N) filters, and theobservations are corrected iteratively for atmospheric extinction andinstrumental response. The data presented give the mean V magnitude,mean B-V, mean U-B, and the estimated uncertainties for these values.The catalog provides a homogeneous catalog of data for a large fieldwith stellar objects delineating membership to the association Sco-Cenand that affect the luminosity function of the aggregate.

A survey for southern Delta Scuti variable stars
Twenty-nine field stars have been tested photoelectrically forshort-period variability. Eighteen of these stars have spectral typesbetween A2 and F5 and are not Am stars; of these, six have beendiscovered to be variable and one is a suspected variable. HD 185969,with a period of 0.361 day, has the longest known period for a star ofthe Delta Scuti type. The predominance of discovered variables withamplitudes close to the detection limit is suggestive of most stars inthe instability strip being pulsators.

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观测天体数据

星座:圓規座
右阿森松:13h59m58.41s
赤纬:-65°32'31.6"
视星:7.554
距离:195.312 天文距离
右阿森松适当运动:-41.1
赤纬适当运动:-11.2
B-T magnitude:7.734
V-T magnitude:7.569

目录:
适当名称   (Edit)
HD 1989HD 121796
TYCHO-2 2000TYC 9012-944-1
USNO-A2.0USNO-A2 0225-18827820
HIPHIP 68388

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