Does 28 CMa have a photometric period differing from its spectroscopic period

Details Does 28 CMa have a photometric period differing from its spectroscopic period Does 28 CMa have a photometric period differing from its spectroscopic period

Jun 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982a%26a...110l..15b&link_type=abstract

Astronomy and Astrophysics, vol. 110, no. 2, June 1982, p. L15-L17.

Astronomy and Astrophysics

Astrophysics

28

B Stars, Light Curve, Stellar Spectra, Stellar Spectrophotometry, Variable Stars, Periodic Variations, Radial Velocity, Ubv Spectra

Scientific paper

Results are presented of recent photometric and spectroscopic observations of 28 CMa. The emission strength has decreased noticeably since 1979. Qualitatively, all previously described variations (Baade, 1982) remained the same. The spectroscopic period, P = 1.37 day, is stable. But unexpectedly the same period could not be detected during five and one-half consecutive nights of uvby photometry. Instead, a 0.435-day periodicity of very small amplitude (0.0007 m) was found in all filters; this periodicity could not be verified in the radial-velocity data. The meaning of this photometric near-constancy is discussed.

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