Near-infrared speckle interferometry of evolved stars and bipolar nebulae

Details Near-infrared speckle interferometry of evolved stars and bipolar nebulae Near-infrared speckle interferometry of evolved stars and bipolar nebulae

Dec 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...287..801d&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 287, Dec. 15, 1984, p. 801-813.

Astronomy and Astrophysics

Astrophysics

106

Infrared Stars, Interferometry, Late Stars, Near Infrared Radiation, Nebulae, Stellar Evolution, Giant Stars, Infrared Interferometers, Speckle Patterns, Spectral Resolution, Stellar Mass Ejection, Supergiant Stars, Visibility

Scientific paper

Near-infrared visibility functions are presented for 16 late-type giants and supergiants and bipolar nebulae. The observational sample consists primarily of OH/IR stars and carbon stars with millimeter wave CO emission. The results are discussed in terms of currently available circumstellar envelope models and in relationship to radio observations. It is found that many infrared-bright stars with dense circumstellar dust envelopes are at least partially resolvable from the ground by speckle interferometry. If the near-infrared diameters are interpreted as the inner boundary for dust in the envelope, this boundary has a radius of order 10 to the 15th cm. The envelope diameters show a systematic increase with wavelength, carbon stars appearing to have a shallower increase than oxygen stars. There is a systematic increase of the apparent angular diameter of the dust envelope with increasing mass loss rate.

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