Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998mnras.301.1083s&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Volume 301, Issue 4, pp. 1083-1094.
Astronomy and Astrophysics
Astronomy
26
Circumstellar Matter, Stars: Mass-Loss, Supergiants, Open Clusters And Associations: Individual: H And Chi Per, Infrared: Stars
Scientific paper
Following our discovery of unidentified infrared (UIR) band emission in a number of M supergiants in h and chi Per, we have obtained 10-μm spectra of a sample of 60 galactic M supergiants. Only three new sources, V1749 Cyg, UW Aql and IRC+40 427, appear to show the UIR bands; the others show the expected silicate emission or a featureless continuum. The occurrence of UIR-band emission in M supergiants is therefore much higher in the h and chi Per cluster than in the Galaxy as a whole. Possible explanations for the origin and distribution of UIR bands in oxygen-rich supergiants are discussed. We use our spectra to derive mass-loss rates ranging from 10^-8 to 10^-4 M_solar yr^-1 for the new sample, based on the power emitted in the silicate feature. The relationship between mass-loss rate and luminosity for M supergiants is discussed, and correlations are explored between their mid-infrared emission properties.
Barlow Michael J.
Skinner Christopher J.
Sylvester Roger J.
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