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HD 74991


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Small Amplitude Red Variables in the AAVSO Photoelectric Program: Light Curves and Periods
Small-amplitude red variables (SARVs) are M giants or supergiants whichare pulsating with small amplitudes (up to 2.5 mag) and with time scalesof 20 to 200 days or more. This paper reports on a ten-year study ofabout two dozen SARVs, carried out through the American Association ofVariable Star Observers (AAVSO) photoelectric photometry program. It hasprovided detailed information on the regularity, period and amplitude ofthese stars. Most have well-defined periods in the 20 to 200 day range.Several also have a long secondary period. One (W Boo) appears to havetwo periods with a ratio of 2.3. (SECTION: Stars)

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观测天体数据

星座:長蛇座
右阿森松:08h46m45.55s
赤纬:-18°45'28.2"
视星:6.599
距离:158.228 天文距离
右阿森松适当运动:8.8
赤纬适当运动:-7.5
B-T magnitude:7.922
V-T magnitude:6.709

目录:
适当名称   (Edit)
HD 1989HD 74991
TYCHO-2 2000TYC 6020-1111-1
USNO-A2.0USNO-A2 0675-09630396
HIPHIP 43108

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