Photoelectric and visual photometry of P Cygni

Details Photoelectric and visual photometry of P Cygni Photoelectric and visual photometry of P Cygni

Feb 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26a...191..248p&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 191, no. 2, Feb. 1988, p. 248-252.

Astronomy and Astrophysics

Astrophysics

33

Astronomical Photometry, Electrophotometry, Supergiant Stars, Variable Stars, Visual Observation, Brightness, Power Spectra, Ubv Spectra

Scientific paper

A total of 225 V, BV, or UBV photoelectric observations of P Cyg were made in 1985 and 1986, as part of a long-term UBV photometric campaign on bright Be stars. The star varied irregularly by up to 0.2 mag in V on time scales ranging from a few days to a few months. The characteristic time scale was 35-40 days. The variations in (B-V) and (U-B) color were considerably smaller than those in V, and were apparently not related to them in any simple way. Also analyzed are the 10-day means of the visual observations of P Cyg in the archives of the American Association of Variable Star Observers. These indicate that there are no strictly periodic brightness variations of the star greater than 0.01 mag, but they suggest that there may be variations of about 0.2 mag on a time scale of a decade or more. The relation between the brightness variations and the other properties of P Cyg is discussed briefly.

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