Optical observations of the galactic supernova remnants G59.5+0.1, G84.9+0.5 and G67.7+1.8

No Thumbnail Available
Gok, F.
Sezer, A.
Aslan, Zeki
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Springer, Van Godewijckstraat 30, 3311 Gz Dordrecht, Netherlands
Araştırma Projeleri
Organizasyon Birimleri
Dergi Sayısı
We present here the optical CCD observations and long slit spectra of the galactic supernova remnants G59.5+0.1, G84.9+0.5 and G67.7+1.8, the first two being observed for the first time. The observations were carried out with the 1.5 m Russian-Turkish joint Telescop (RTT150) at TUBITAK National Observatory (TUG). The images were taken with H alpha, [SII] and their continuum filters. After subtracting the continuum from Ha and [SII], [SII]/H alpha ratio is obtained. The average ratio is found to be 0.41 for G59.5+0.1 and 0.44 for G84.9+0.5, in a very good agreement with the ratios obtained from the optical spectra, namely 0.46 and 0.40, respectively, indicating that these remnants are close to, or interacting with, HII regions. G59.5+0.1 and G84.9+0.5 remnants show diffuse-shell morphology while G67.7+1.8 shows arc-shell morphology. From the emission lines of the spectra, the electron density Ne, pre-shock density n(c), explosion energy E, interstellar extinction E(B-V), and neutral hydrogen column density N(HI) are calculated and shock velocity V(s) is estimated for these remnants.
Anahtar kelimeler
Galactic supernova remnants, G59.5+0.1, G84.9+0.5, G67.7+1.8 CCD image, Longslit spectra, Southern Spectrophotometric Standards, Interstellar-Medium, Shock-Waves, Models