The expansion of the outer circumstellar shell of P Cygni

Details The expansion of the outer circumstellar shell of P Cygni The expansion of the outer circumstellar shell of P Cygni

Dec 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996mnras.283l..69m&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 283, Issue 3, pp. L69-L71.

Astronomy and Astrophysics

Astronomy

19

Line: Profiles, Circumstellar Matter, Stars: Individual: Pcygni, Stars: Mass-Loss, Ism: Bubbles

Scientific paper

The expansion of a faint, outer irregular shell to the circumstellar nebulosity of the luminous blue variable PCygni has been measured with the Manchester Echelle Spectrometer combined with the high-altitude San Pedro Martir 2.1-m UNAM telescope. This is the first ever measurement of the expansion velocity of such a historic remnant of a luminous blue variable star eruption. The faintness of the outer shell and the high brightness and close proximity of the star make it a particularly difficult observation. The high optical luminosity of the spectrometer and the clarity of the sky have combined to permit a successful measurement. A radial expansion velocity of 185+/-10 km s^-1 is implied, which suggests an age of 2100+/-200 yr for this 1.6 arcmin diameter outer shell, if we assume a distance of 1.8 kpc to PCygni.

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