Spectral and photometric evolution of the symbiotic nova HM Sagittae in 1986-2002

Arkhipova, V.P.; Esipov, V.F.; Ikonnikova, N.P.; Noskova, R.I.

Авторы: Arkhipova V.P., Esipov V.F., Ikonnikova N.P., Noskova R.I.
Журнал: Astronomy Letters
Том: 30
Номер: 4
Год издания: 2004
Издательство: Maik Nauka/Interperiodica Publishing
Местоположение издательства: Russian Federation
Первая страница: 258
Последняя страница: 267
DOI: 10.1134/1.1695087
Аннотация: We present the results of our photometric and spectroscopic observations of the symbiotic nova HM Sge in 1994-2002. After its outburst in 1975, the star was shown to fade in the U, B, V bands at a rate of about 0(.)(m)05 per year. The behavior of the B-V and U-B color indices reflects the variations of emission lines and, in part, the fading of the erupted component. We have studied the evolution of the emission spectrum in the range from Hdelta to lambda7751 Angstrom over the period 1986-2002. The absolute fluxes in the hydrogen lines decreased by half, the ionization of the gaseous envelope continued to increase, and the Raman 0 VI lines appeared and strengthened. The significant (threefold) decrease in the ratio of the auroral and nebular 0 111 lines is interpreted as a drop in the electron temperature of the envelope as its density decreased by a factor of about 1.5. We have measured the absolute intensity of the near-infrared continuum up to 10 000 A and show that the infrared continuum follows the pulsations of the Mira star in the system HM Sge. We conclude that the dust envelope around the cool component became noticeably transparent in the 1990s. (C) 2004 MAIK "Nauka/Interperiodica".
Добавил в систему: Есипов Валентин Федорович

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Spectral and photometric evolution of the symbiotic nova HM Sagittae in 1986-2002статья