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HD 149771


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Search for Beta Cephei stars south of declination -20 deg. II - Photometric and spectrographic observations of early B giants and subgiants - Winter objects
Results of the second part of a program begun in 1975 (Jerzykiewicz andSterken, 1977) are presented. Out of 39 Beta Cephei candidates observedphotometrically, seven turned out to vary with the b ranges exceeding0.020 m, while 21 have been found constant to within 0.010 m or better.For the 56 comparison stars these numbers are 6 and 25, respectively.From spectrographic observations one of the candidates, HD 129557 = HR5488 (B2 III), iis found to be a Beta Cephei variable with a period of0.135 d and the 2 K amplitude of 18.4 km/s. A comparison of the resultsof this program with other recent photometric searches for Beta Cepheivariables shows good agreement in most cases. There are severaldiscrepant stars, however. These are discussed in some detail. Aconclusion emerges that in the low temperature extension of the BetaCephei region, if such an extension exists at all, on-and-off typepulsations occur.

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관측 및 측정 데이터

별자리:극락조자리
적경:16h42m40.29s
적위:-70°34'49.7"
가시등급:7.396
거리:189.394 파섹
적경상의 고유운동:-14.8
적위상의 고유운동:-25.4
B-T magnitude:7.391
V-T magnitude:7.396

천체목록:
일반명   (Edit)
HD 1989HD 149771
TYCHO-2 2000TYC 9278-620-1
USNO-A2.0USNO-A2 0150-16837535
HIPHIP 81817

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