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Dust Shell around V718 Scorpii

Published online by Cambridge University Press:  12 April 2016

M. Parthasarathy
M. Parthasarathy*
Affiliation:
Indian Institute of Astrophysics,Bangalore 560 034,India

Extract

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V718 Sco (HD 145718 = SAO 184232) is an eclipsing-binary system with an orbital period of about 200d, depth of primary minimum about lṃ4 and a primary component of spectral type A2 (Wood et al., 1980). Neither period nor eclipse depth are well determined and the system has not been observed photoelectrically. The IRAS point-source catalogue (Beichman et al., 1985) contains an object having a far-infrared excess at a position closely agreeing with that given for V718 Scorpii in the S.A.0. catalogue. The fluxes (in Janskys) at 12 µm, 25 µm, 60 µm and 100 µm are 5.73, 5.92, 4.91, 3.37 respectively and this distribution suggests that V718 Sco is surrounded by a dust envelope in which there is a temperature gradient. From the ratios of the fluxes, a dust temperature of about 140 K is found; the fluxes at 60 μm and 100 μm would suggest a lower temperature.

Type
Research Article
Information
International Astronomical Union Colloquium , Volume 107: Algols , 1989 , pp. 356
Copyright
Copyright © Kluwer 1989

References

Beichman, C.A., Neugebauer, G., Habing, H.J., Clegg, P.E., and Chester, T.J. eds. 1985, Explanatory Supplement to the IRAS Catalogs and Atlases (Washington: GPO).Google Scholar
Wood, F.B., Oliver, J.P., Florkowski, D.R., and Koch, R.H., 1980, A finding list for observers of interacting binary stars, Publ. Dept. Astronomy, Univ. Florida, Vol. I.Google Scholar