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Short-Periodic Radial Velocity Variations of the B9P Star ET and

Published online by Cambridge University Press:  12 April 2016

E. Gerth
E. Gerth*
Affiliation:
Zentralinstitut für Astrophysikder Akademie der Wissenschaften der DDR, DDR-1500 Potsdam Telegrafenberg

Abstract

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Spectroscopic observations of the B9p star ET and secured at the Bulgarian National Observatory Roshen in the years 1981–1984, consisting of 97 plates, show clearly a radial velocity period of 0.198 d - with a ratio to the photometrical period of exactly 2:1. This behaviour would hint at a close binary system; but there arise difficulties in explaining it by this way because of the extreme short period, so that pulsation must be taken into account. However, besides of the confident period of 0.198 d, there is evidence for shorter periods in the region of 45 min, which may be attributed only to pulsational processes.

Type
Section II - Systematics, Photometry
Information
International Astronomical Union Colloquium , Volume 90: Upper Main Sequence Stars with Anomalous Abundances , 1986 , pp. 235 - 238
Copyright
Copyright © Reidel 1986

References

1. Panov, K.P.: 1978, III Sci. Conf. on Magnetic Stars, Praha, Czech. Acad. Sci., Astron. Inst., p. 19 Google Scholar
2. Ouhrabka, M., and Grygar, J.: 1979, IBVS No 1600 Google Scholar
3. Hildebrandt, G., and Hempelmann, A.: 1981, Astron. Nachr. 302, 155 CrossRefGoogle Scholar
4. Gerth, E., Scholz, G., and Panov, K.P.: 1984, Astron. Nachr. 205, 75 Google Scholar
5. Deeming, T.J.: 1975, Astrophys. Space Sci. 36, 137 CrossRefGoogle Scholar
6. Gerth, E., Scholz, G., and Panov, K.P.: 1984, VI Sci. Conf. on Magnetic Stars, Riga, Astr. Counc. SSSR, p. 68 Google Scholar
7. Panov, K.P.: 1984, VI Sci. Conf. on Magnetic Stars, Riga, Astr. Counc. SSSR, p. 77 Google Scholar