PHOTOMETRY OF HD 45088: A NEW BRIGHT BY DRACONIS VARIABLE

PHOTOMETRY OF HD 45088: A NEW BRIGHT BY DRACONIS VARIABLE

The K-dwarf SB2 system HD 45088, predicted to be a BY Dra variable on the basis of its orbital period and emissionline characteristics, is found to be photometrically variable. The amplitude is significantly variable, having ranged between ΔV= 0ṃ0.2 during February-April 1980 to ΔV = 0ṃ045 during Se...

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Veröffentlicht in:Publications of the Astronomical Society of the Pacific 1981-08, Vol.93 (554), p.504-506
Hauptverfasser: BOPP, BERNARD W., HALL, DOUGLAS S., HENRY, GREGORY W., NOAH, P., KLIMKE, A.
Format: Artikel
Sprache:eng
Schlagworte:
Astronomical magnitude
Astronomical photometry
Astronomy
Binary stars
Comparison stars
Observatories
Reflectors
Stellar classification
Stellar rotation
Variable stars
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Zusammenfassung:The K-dwarf SB2 system HD 45088, predicted to be a BY Dra variable on the basis of its orbital period and emissionline characteristics, is found to be photometrically variable. The amplitude is significantly variable, having ranged between ΔV= 0ṃ0.2 during February-April 1980 to ΔV = 0ṃ045 during September-October 1980. The photometric period, shown to be 7.36 days, differs appreciably from the 6.99-day orbital period. Possible explanations for this difference are (1) nonsynchronization in a young binary, (2) spot development at high latitudes on a differentially rotating star, and (3) imperfect synchronization in a binary with an eccentric orbit.
ISSN:0004-6280
1538-3873
DOI:10.1086/130867