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Issue A&A
Volume 373, Number 2, July II 2001
Page(s) 572 - 575
Section Formation, structure and evolution of stars
DOI http://dx.doi.org/10.1051/0004-6361:20010623



A&A 373, 572-575 (2001)
DOI: 10.1051/0004-6361:20010623

UV (IUE) spectra of the central stars of high latitude planetary nebulae Hb7 and Sp3

G. Gauba1, M. Parthasarathy1, 2, Y. Nakada3, 4 and T. Fujii3

1  Indian Institute of Astrophysics, Koramangla, Bangalore 560034, India
2  National Astronomical Observatory, 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan
3  Institute of Astronomy, School of Science, University of Tokyo, Bunkyo, Tokyo 113-0033, Japan
4  Kiso Observatory, School of Science, University of Tokyo, Mitaka, Kiso, Nagano 397-0101, Japan

(Received 15 November 2000 / Accepted 23 April 2001)

Abstract
We present an analysis of the UV (IUE) spectra of the central stars of Hb7 and Sp3. Comparison with the IUE spectrum of the standard star HD 93205 leads to a spectral classification of O3V for these stars, with an effective temperature of 50 000 K. From the P-Cygni profiles of CIV (1550 Å), we derive stellar wind velocities and mass loss rates of -1317 km s $^{-1} \pm 300$ km s-1 and $2.9\times10^{-8} M_{\odot}$ yr-1 and -1603 km s $^{-1} \pm 400$ km s-1 and $7\times10^{-9} M_\odot$ yr-1 for Hb7 and Sp3 respectively. From all the available data, we reconstruct the spectral energy distribution of Hb7 and Sp3.


Key words: planetary Nebulae: individual: Hb7, Sp3 -- stars: AGB and Post-AGB -- stars: evolution -- stars: mass-loss -- stars: winds -- ultraviolet: stars

Offprint request: G. Gauba, gauba@iiap.ernet.in

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© ESO 2001


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