Spectral Behavior of the Symbiotic Nova HM Sge in the Ultraviolet
Abstract
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).
- Publication:
-
Revista Mexicana de Astronomia y Astrofisica
- Pub Date:
- April 2020
- DOI:
- 10.22201/ia.01851101p.2020.56.01.08
- Bibcode:
- 2020RMxAA..56...63S
- Keywords:
-
- binaries: symbiotic;
- stars: individual: HM Sge;
- ultraviolet: stars