Optical observations of the galactic supernova remnants G59.5+0.1, G84.9+0.5 and G67.7+1.8
Astrophysics and Space Science, vol.318, no.3-4, pp.207-214, 2008 (SCI-Expanded, Scopus)
- Publication Type: Article / Article
- Volume: 318 Issue: 3-4
- Publication Date: 2008
- Doi Number: 10.1007/s10509-008-9914-4
- Journal Name: Astrophysics and Space Science
- Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
- Page Numbers: pp.207-214
- Keywords: CCD image, Galactic supernova remnants: G59.5+0.1, G84.9+0.5, G67.7+1.8, Longslit spectra
- Süleyman Demirel University Affiliated: No
Abstract
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 Telescope (RTT150) at TÜBİTAK National Observatory (TUG). The images were taken with Hα, [SII] and their continuum filters. After subtracting the continuum from Hα and [SII], [SII]/Hα 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 nc, explosion energy E, interstellar extinction E(B-V), and neutral hydrogen column density N(HI) are calculated and shock velocity Vs is estimated for these remnants. © 2008 Springer Science+Business Media B.V.