IUE observing program

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Apr 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992cub..rept.....b&link_type=abstract

Technical Report, Colorado Univ. Boulder, CO United States Center for Astrophysics and Space Astronomy.

Astronomy and Astrophysics

Astronomy

Emission Spectra, Mira Variables, Ultraviolet Astronomy, Stellar Spectra, Ultraviolet Spectra, Iue, Line Spectra, Cosmic Dust

Scientific paper

A list of 31 IUE observations is presented. Efforts were concentrated on analyzing data from two primary targets: S Carina and L2 Puppis. Twenty-nine high dispersion images of S Car have been processed. Analysis of the FeI, FeII, and MgII emissions is proceeding. The large number of emission lines that have been detected are presented. Ultraviolet MgII flux observations for L2 Puppis and its visual light curve indicate that an episode of enhanced dust production began in 1986. Detailed numerical calculations for Miras and for parameters appropriate for L2 Puppis indicate that this star is only marginally able to sustain a dusty wind. It is suggested that patches of the stellar surface alternate between a quiescent state (with little dust, an extended warm atmosphere, and low atmospheric TiO absorption) and a dusty wind state (with a cooler atmosphere and higher atmospheric TiO absorption). Such a patchy atmospheric structure also provides a natural explanation for the observed time and wavelength dependence of linear polarization in L2 Puppis. An incidental result is the discovery that L2 Puppis has a large P-dot, probably indicating that this star has recently undergone a helium shell flash.

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