FG Sagittae: New Observations in the R CrB Photometric Phase

Details FG Sagittae: New Observations in the R CrB Photometric Phase FG Sagittae: New Observations in the R CrB Photometric Phase

Nov 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003astl...29..763a&link_type=abstract

Astronomy Letters, vol. 29, p. 763-774 (2003)

Astronomy and Astrophysics

Astronomy

2

Scientific paper

In 1999-2002, we continued our photometric and spectroscopic observations of FG Sge. This star has been in a new R CrB photometric phase since 1992. We constructed the BVRI light curves and studied the behavior of the color indices as a function of the fading amplitude. As previously, all of the three deep minima observed during this period were found to be blue on the descent; this was interpreted as the result of strong stellar light scattering in dust clouds formed on the line of sight. We analyzed the wavelength dependence of extinction in the circumstellar shell outside fadings, which was similar to Whitford's standard reddening law. Low-resolution spectroscopic observations allowed us to study the changes in the intensities of Swan bands and the Na I D doublet during deep and shallow (up to 1 mag) fadings. We confirmed the reversal of the spectrum of the extended stellar envelope on the descending branches of deep minima.

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