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2001•Monthly Notices of the Royal Astronomical SocietyOpen access

New Wolf-Rayet central stars of planetary nebulae identified on the AAO/UKST HαSurvey

D. H. Morgan, Q. A. Parker, D. Russeil

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Abstract

The central stars of two of the new planetary nebulae found during scans of the AAO/UKST Hα Survey of the Milky Way have been found to exhibit Wolf—Rayet (WR) emission features. One (PMR 1) is an early-type star of class either [WO4] or [WC4]. The other (PMR 2) is a late [WC] star which, depending on the classification scheme used, is either intermediate in class between [WC9] and [WC10] or the sole member of the [WC10] class. Both stars exhibit unusual spectral features which may be attributed to enhanced nitrogen in their atmospheres and could be indicative of unusual stellar evolution.

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What this paper is about

The central stars of two of the new planetary nebulae found during scans of the AAO/UKST Hα Survey of the Milky Way have been found to exhibit Wolf—Rayet (WR) emission features. One (PMR 1) is an early-type star of class either [WO4] or [WC4]. The other (PMR 2) is a late [WC] star which, depending on the classification scheme used, is either intermediate in class between [WC9] and [WC10] or the sole member of the [WC10] class. Both stars exhibit unusual spectral features which may be attributed to enhanced nitrogen in their atmospheres and could be indicative of unusual stellar evolution.

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Available abstract

The central stars of two of the new planetary nebulae found during scans of the AAO/UKST Hα Survey of the Milky Way have been found to exhibit Wolf—Rayet (WR) emission features. One (PMR 1) is an early-type star of class either [WO4] or [WC4]. The other (PMR 2) is a late [WC] star which, depending on the classification scheme used, is either intermediate in class between [WC9] and [WC10] or the sole member of the [WC10] class. Both stars exhibit unusual spectral features which may be attributed to enhanced nitrogen in their atmospheres and could be indicative of unusual stellar evolution.

Key concepts: Physics, Wolf–Rayet star, Planetary nebula, Stars, Astrophysics, O-type star, Milky Way, Stellar classification

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