Abstract

SANAD, M. R.  and  ABDEL-SABOUR, M. A.. Spectral Behavior of the Symbiotic Nova HM Sge in the Ultraviolet. Rev. mex. astron. astrofis [online]. 2020, vol.56, n.1, pp.63-69.  Epub Mar 19, 2021. ISSN 0185-1101.  https://doi.org/10.22201/ia.01851101p.2020.56.01.08.

Ultraviolet observations of the symbiotic nova HM Sge were obtained from the International Ultraviolet Explorer (IUE) through the interval from 1980 - 1992. Three line profiles demonstrating the variations of some emission lines at different dates are presented. We determined the reddening of HM Sge from the 2200 Å absorption feature; the estimated value is E(B - V ) = 0:34 ± 0.02. We studied CIV at 1550 Å, He II 1640 Å, and CIII] at 1909 Å produced in the wind from the hot star. The line flux variations at different dates could be explained in terms of the variations of temperature in the emitting region as a result of mass loss variations. The IUE observations can be explained by the models of Girard & Willson (1987); Formiggini et al. (1995).

Keywords : binaries: symbiotic; stars: individual: HM Sge; ultraviolet: stars.

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