The variability of four yellow supergiants - Possible protoplanetary objects

Details The variability of four yellow supergiants - Possible protoplanetary objects The variability of four yellow supergiants - Possible protoplanetary objects

May 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993astl...19..169a&link_type=abstract

Astronomy Letters, Vol. 19, p. 169-172; Pis'ma v Astronomicheskij Zhurnal (ISSN 0320-0108), vol. 19, no. 5, p. 436-442. In Russ

Astronomy and Astrophysics

Astronomy

6

Brightness Distribution, Hertzsprung-Russell Diagram, Protoplanets, Supergiant Stars, Ubv Spectra, Astronomical Photometry, Planetary Nebulae, Variability

Scientific paper

Photoelectric UBV observations of four supergiants with a large IR
excess (IRAS 18095 + 2704, IRAS 19386 + 0155, and SAO 34504), possible
progenitors of planetary nebulae, are presented. All of them exhibited
brightness variations with amplitudes from 0.2 to 0.5 m over the period
1990-1992.

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