Hostname: page-component-745bb68f8f-b6zl4 Total loading time: 0 Render date: 2025-01-24T06:12:37.245Z Has data issue: false hasContentIssue false
  • English
  • Français

Spectroscopic Observations of Nova Cephei 1971

Published online by Cambridge University Press:  14 August 2015

L. Rosino
L. Rosino*
Affiliation:
Astrophysical Observatory of Asiago

Abstract

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

Spectroscopic observations of Nova Cep 1971 in the visual and infrared regions were carried out at Asiago from July to December 1971. The spectra were characterized at first by the presence of wide emission bands of moderate excitation (H, OI, NI, FeII) accompanied by two absorption systems with mean radial velocity −1300 km s−1 and −2200 km s−1. The velocity was increasing with time. The absorption spectrum disappeared in September and soon the nova entered the nebular stage. The HeI flash was observed in mid-September. In the following months the degree of excitation was steadily increasing. The nebular [OIII] lines became outstanding, even stronger than Hα and the spectrum was characterized by forbidden and permitted lines of relatively high ionization potential (O II, O III, N II, N III, He II).

The profiles of the emission bands were complex from the beginning, with a strong central peak. Later, most of the bands split into two separate components, with radial velocities ± 1360 km s−1.

The light curve was that of a relatively fast nova. The minimum, B∼ 17.5, was attained in the first half of 1973.

Type
Part 6 / Novae
Information
Symposium - International Astronomical Union , Volume 67: Variable Stars and Stellar Evolution , 1975 , pp. 347 - 354
Copyright
Copyright © Reidel 1975 

References

Aikman, G. C., Hilditch, R. W., and Younger, F.: 1973, Publ. Astron. Soc. Pacific 85, 756.Google Scholar
Alksnis, A. and Dunzans, I.: 1972, Astron. Circ., No. 681.Google Scholar
Bahng, J. D.: 1972, Monthly Notices Roy. Astron. Soc. 158, 151.Google Scholar
Ciatti, F. and Rosino, L.: 1974, Astron. Astrophys. Suppl. 16, 305.Google Scholar
Huruhata, H.: 1971, IAU Circ., No. 2342.Google Scholar
Kohoutek, L. and Klawitter, P.: 1973, Astron. Astrophys. Suppl. 11, 347.Google Scholar
Kuwano, Y.: 1971, IAU Circ., No. 2340.Google Scholar
McLaughlin, D. B.: 1960, Stellar Atmospheres, Univ. Chicago Press, p. 585.Google Scholar
Rosino, L.: 1964, Ann. Astrophys. 27, 498.Google Scholar
Thomas, J. C., Cowley, A. P., MacConnell, D. J., and Toney, J.: 1973, Publ. Astron. Soc. Pacific 85, 309.Google Scholar
Tsessevich, V. P.: 1971, Astron. Circ. USSR, No. 664.Google Scholar
Wild, P.: 1971, IAU Circ., No. 2345.Google Scholar