Changes in the photometric and colorimetric characteristics of eruptive stars at the stage of circumstellar dust envelope formation - PU VUL during the deep minimum of 1980

Details Changes in the photometric and colorimetric characteristics of eruptive stars at the stage of circumstellar dust envelope formation - PU VUL during the deep minimum of 1980 Changes in the photometric and colorimetric characteristics of eruptive stars at the stage of circumstellar dust envelope formation - PU VUL during the deep minimum of 1980

Aug 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988azh....65..807e&link_type=abstract

Astronomicheskii Zhurnal (ISSN 0004-6299), vol. 65, July-Aug. 1988, p. 807-815. In Russian.

Astronomy and Astrophysics

Astronomy

8

Interstellar Matter, Light Curve, Stellar Envelopes, Stellar Evolution, Stellar Spectrophotometry, Cosmic Dust, Particle Size Distribution, Silicates, Stellar Models

Scientific paper

It is shown that the model of the circumstellar dust envelope with the size of particles changing in time explains several observed characteristics of the photometric and colorimetric behavior of PU Vul at the stage of circumstellar dust envelope formation. These characteristics include the time-dependent light minima in various spectral bands, the reddening of the star during the decline of light and the bluing in the area of minimal brightness, the rapid light and color variations at the light minimum, and certain characteristics of the color-magnitude diagram. From the comparison of the calculated curves and the observed data, it is concluded that the deep minimum of 1980 was caused by the formation, near the hot component of the system, of a circumstellar envelope of silicate particles, which grew from molecular size to the size of interstellar particles with a mean growth rate of 0.001 micron/day.

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