Direct imagery of circumstellar shells around Ofpe/WN9 stars in the galaxy and in the LMC

Details Direct imagery of circumstellar shells around Ofpe/WN9 stars in the galaxy and in the LMC Direct imagery of circumstellar shells around Ofpe/WN9 stars in the galaxy and in the LMC

Aug 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...182..229s&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 182, no. 2, Aug. 1987, p. 229-236.

Astronomy and Astrophysics

Astrophysics

59

Astronomical Spectroscopy, Nebulae, Stellar Envelopes, Wolf-Rayet Stars, Chronology, Emission Spectra, Narrowband, Size (Dimensions), Stellar Mass Ejection

Scientific paper

The galactic Ofpe/WN9 stars AG Car and He 3-519 and the LMC objects S 61, R 84, R 99, and R 127 have been observed with narrow-band imagery. Both galactic stars are surrounded by ring nebulae. Nebulae around the LMC objects have previously been suspected from spectroscopy. The nebulosities were resolved around S 61 and R 127, while the emission from R 84 and r 99 could not be resolved. The linear sizes of the resolved objects are of the order of less than 1 pc, their kinematic age is of the order of 10,000 yr and their ionized masses are of the order of 1-solar mass, i.e., they are larger and more massive than a typical classical planetary nebula. They are also clearly different from classical planetary nebulas with respect to their nebular spectra and the luminosity of the central stars. It is suggested that the nebulas have been ejected during violent S Dor outbursts of the central stars. The mass lost during such outbursts may be sufficiently large to influence the stellar evolution.

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