A new eclipsing spectroscopic binary, HD 200391.
Abstract
The star HD 200391, (1900) a 20b58r~1, ~ +27o24~, m 7.5, Go (Harv.), was found to be a double-lined binary in 1946. Spectrograms taken during 1949 to 1951 with the 7~-inch reflector of the David Dunlap Observatory, using a dispersion of 33 A/mm at H~, led to the solution of the orbit. Sterne's method for small eccentricities was used. The spectrographic elements are: P 0.69809 m.s.d. a1sini ~.~26Xio6km e 0.017+0.007 a1sini i.~33>Cio6km w 62?6 +29 m1/m0 1.078 ~ -25.22 +0.78km/sec (m1+m2)sin1i 1.730 K1 138.49 +1.39km/sec Pri. spec. GoV K2 149.32 +1.39km/sec Sec. spec. GsV T 3130.752+0.001 JD Of particular interest was the very short period. It was suspected that the star might prove to be an eclipsing binary. This, in fact, has been found to be true; on Aug. 7, 1955, Mr. Bakos, using photoelectric equipment on the ~~-inch reflector, found the magnitud:e changed by over a tenth of a magnitude. The period was improved to the value 0d698084 Later the star was observed more extensively in yellow and blue light, although more observations are needed before the elements of the light curve can be obtained. Epoch of miD.: JD 2435050.5524 Yellow mag. (Johnson's system): max. 7.29 pri. min. 7.45 sec. min. 7.43 It appears that the light varies continuously between minima, and that the secondary mini- mum, although not well observed, is much narrower than the primary. DavidDunlap Observatory, Richmond Hill, Ont.
- Publication:
-
The Astronomical Journal
- Pub Date:
- May 1956
- DOI:
- 10.1086/107417
- Bibcode:
- 1956AJ.....61..188N