Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995mnras.276.1101a&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Volume 276, Issue 4, pp. 1101-1108.
Astronomy and Astrophysics
Astronomy
27
Ism: Abundances, Planetary Nebulae: General, Planetary Nebulae: Individual: Bd+303639
Scientific paper
The dusty young low-excitation planetary nebula BD +303639, denoted as `Campbell's hydrogen envelope star', has been the subject of many investigations, particularly in the infrared wavelength region. We are concerned here with a high-dispersion study of the optical spectrum. Detailed high-spectral-resolution observations of BD +303639 have been made at the centre of the nebular image with a slit 1.2x4.0 arcsec^2, for the wavelength region 3650 to 10050A, using the Hamilton echelle spectrograph at Lick Observatory. This compact nebula has a density of about 10^4 atoms cm^-3 and T_epsilon~8800K. Its chemical composition does not seem to be remarkable; it resembles roughly that of the Sun, although the luminous central star exhibits the spectrum of a classical carbon Wolf-Rayet type with T_eff=30000K. It is suggested that the planetary nebula may brighten and rise in excitation as the central star evolves and grows hotter.
Aller Lawrence H.
Hyung Siek
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