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HD 196709


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A survey for rapid variability among early main-sequence A stars
A survey of nonpeculiar early (A0-A5) main-sequence A stars for rapid,low-amplitude variability is presented. The survey is also anindependent test of the main-sequence mass-loss theory proposed byWillson et al. (1986). All observations were gathered with theUniversity of Wisconsin Two-Star Photometer. Several period-searchingmethods are used to analyze time series of differential-photometricdata. This instrument coupled with a computerized high-speed datacollection system was used with small telescopes at Pine BluffObservatory and Table Mountain Observatory. Several period-searchmethods are used to analyze time series of differential-photometricdata. This instrument and data-reduction technique allow millimagnitudelight variations to be detected. The survey also discovered severallow-amplitude Delta Sct stars, all of which are in or blueward of therecognized instability strip.

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观测天体数据

星座:海豚座
右阿森松:20h38m28.87s
赤纬:+20°53'57.2"
视星:8.731
右阿森松适当运动:-1.5
赤纬适当运动:5.5
B-T magnitude:8.765
V-T magnitude:8.734

目录:
适当名称   (Edit)
HD 1989HD 196709
TYCHO-2 2000TYC 1645-1748-1
USNO-A2.0USNO-A2 1050-18262587

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