A survey of variable yellow supergiants in the southern Milky Way

Details A survey of variable yellow supergiants in the southern Milky Way A survey of variable yellow supergiants in the southern Milky Way

Jun 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981pasp...93..351a&link_type=abstract

Astronomical Society of the Pacific, Publications, vol. 93, June-July 1981, p. 351-360. Research supported by the Consejo Nacio

Astronomy and Astrophysics

Astronomy

28

Light Curve, Milky Way Galaxy, Stellar Spectrophotometry, Supergiant Stars, Variable Stars, Binary Stars, Cepheid Variables, Electrophotometry, Galactic Clusters, Reference Stars, Stellar Magnitude, Stellar Spectra

Scientific paper

Forty-three supergiants of spectral type F0-G8, including the RV Tauri star U Mon and the small-amplitude Cepheid HR 4768, have been monitored in brightness for about a month. Three new variables are announced. HR 6109 - a comparison star and a member of a spectroscopic binary with P equals 40 days (Eggen 1973) - is suspected to be a Delta Scuti star. HR 4912 shows a range of 0.32 magnitude in B; the period is between 44 and 68 days. The Cepheid nature of HR 4912 cannot be established on the basis of the data. HR 4110 - the central star of the galactic cluster IC 2581 - shows a range in B of 0.07 magnitude and its most likely period is about 59 days. Arguments are offered against the possible Cepheid interpretation of HR 4110. The variability of HR 2910, HR 3026, and HD 67458 is suspected. The star R Pup, which has been claimed and disclaimed as a variable for a century, did not show significant variation during the observing period.

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