Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978a%26as...31..337r&link_type=abstract
Astronomy and Astrophysics Supplement Series, vol. 31, Mar. 1978, p. 337-352.
Astronomy and Astrophysics
Astrophysics
17
Absorption Spectra, Novae, Stellar Evolution, Stellar Spectra, Emission Spectra, Light Curve, Nebulae, Spectral Line Width, Stellar Magnitude
Scientific paper
A description is given of the spectral evolution of the slow nova HR Del, particularly during its decline. The nova remained near maximum brightness for about one year, displaying large brightness fluctuations. During this period not less than nine different absorption systems were observed in the spectra, with radial velocities from -170 to -1790 km/s. The final decline began in May 1968, and the nova entered the nebular stage at the end of July. The nebular spectrum in 1968-1969 was characterized by the presence of wide emission bands of H, He I, N II, and forbidden lines of atoms in different stages of ionization, among which are forbidden O I, O III, Ne III, Ne V, Fe VI, Fe VII, and Fe X, all with complex structure. The lines of highly ionized atoms split into two components, then slowly weakened and finally disappeared, followed by the auroral lines of forbidden N II at 5755 A, forbidden O III at 4363 A, and He I. In the last spectra taken in 1974-1976, when the nova was near minimum brightness, the nebular lines of forbidden O III at 4959 to 5007 A were still present, strong and wide, together with forbidden N II at 6543 to 6583 A (partly blended with H-alpha), He II at 4686 A, the Balmer lines from H-alpha to H-epsilon, and just a trace of N III at 4640 A.
Rafanelli Piero
Rosino Leonida
No associations
LandOfFree
The spectral evolution of nova HR Del /1967/ during its decline does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with The spectral evolution of nova HR Del /1967/ during its decline, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The spectral evolution of nova HR Del /1967/ during its decline will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1078461