S266: A Ring Nebula around a Luminous Blue Variable?

Details S266: A Ring Nebula around a Luminous Blue Variable? S266: A Ring Nebula around a Luminous Blue Variable?

Dec 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998aas...193.9907f&link_type=abstract

American Astronomical Society, 193rd AAS Meeting, #99.07; Bulletin of the American Astronomical Society, Vol. 30, p.1396

Astronomy and Astrophysics

Astronomy

Scientific paper

A number of authors have classified the object S266 as an HII region or as a planetary nebula. We suggest that it is a nebula around a Luminous Blue Variable (LBV). S266 is located close to the Galactic Anticenter (at l=195(deg) ) and contains a central stellar object, MWC137, which has been classified as a possible Ae/Be star at a distance of 1.3 kpc (Weintraub, 1990). We show that S266 is associated with a molecular cloud at a moderately well-determined kinematic distance of 9.6 +/- 4.8 kpc. Published photometry on MWC137 combined with our spectra of the nebular (to estimate extinction) lead to an absolute magnitude of M_V=-8.2, consistent with the star being a type Ia supergiant. From VLA observations we find a mass loss rate for MWC137 of (8.8 +/- 4.4) x 10(-6) M_sun ;/year. We show that the wind from MWC137 has swept up a substantial amount of mass (~ 10 M_sun) in a shell.

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