The spectral and photometric variability of the object Th 4-4 from a catalog of planetary nebulae

Details The spectral and photometric variability of the object Th 4-4 from a catalog of planetary nebulae The spectral and photometric variability of the object Th 4-4 from a catalog of planetary nebulae

Jan 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989pazh...15...29k&link_type=abstract

Pis'ma v Astronomicheskii Zhurnal (ISSN 0320-0108), vol. 15, Jan. 1989, p. 29-32. In Russian. In Russian. In Russian.

Astronomy and Astrophysics

Astronomy

1

Astronomical Catalogs, Planetary Nebulae, Stellar Spectrophotometry, B Stars, Brightness Distribution, Peculiar Stars

Scientific paper

The results of observations of Th 4-4 carried out during 1970-1988 are presented. During this period, the integrated brightness of Th 4-4 decreased from 13.4 to 15.3 m. On the basis of spectrograms obtained in 1970-1973, Th 4-4 was classified as a peculiar Be-star. Currently its spectrum resembles that of a high-density low-excitation planetary nebula.

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