Astron. Astrophys. 364, 191-198 (2000)

A study of RW Ursae Minoris shell

H.H. Esenoglu ¹, A.T. Saygac ¹, A. Bianchini ², A. Retter ³, M.T. Özkan ⁴ and M. Altan <sup>5

1</sup> University of Istanbul, Faculty of Science, Department of Astronomy and Space Sciences, 34452 University-Istanbul, Turkey (esenoglu@istanbul.edu.tr)
² University of Padova, Department of Astronomy, Italy
³ Keele University, Physics Department, Staffordshire, ST5 5BG, UK
⁴ Istanbul University Observatory Research and Application Center, 34452 University-Istanbul, Turkey
⁵ Anadolu University, Satellite and Space Sciences Research Institute, Muttalip, Eskisehir, Turkey

Received 11 July 2000 / Accepted 5 September 2000

Abstract

We find an expansion parallax for the slow nova RW UMi (Nova Ursae Minoris 1956). A narrow-band image shows that the diameter of the nova shell in 1995 was arcsec. We derive a distance of pc, and an absolute magnitude at maximum of which are consistent with previous estimates for the nova. We also revised known relations between various parameters of nova systems.

Key words: stars: distances stars: individual: Nova Ursae Minoris 1956 stars: individual: RW UMi stars: novae, cataclysmic variables

Send offprint requests to: H.H. Esenoglu

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Contents

• 1. Introduction
  • 1.1. Nova shells
  • 1.2. RW UMi
• 2. Observations and reductions
• 3. Results and discussion
  • 3.1. The direct image
  • 3.2. Nebular expansion velocity
  • 3.3. Distance and absolute magnitude at maximum
• 4. Summary
• Acknowledgements
• References

© European Southern Observatory (ESO) 2000

Online publication: December 15, 2000
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