A search for eclipses in Delta Sagittae

Details A search for eclipses in Delta Sagittae A search for eclipses in Delta Sagittae

Jun 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991pasp..103..556f&link_type=abstract

Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 103, June 1991, p. 556-558.

Astronomy and Astrophysics

Astronomy

Eclipsing Binary Stars, Stellar Oscillations, Stellar Spectrophotometry, Ubv Spectra, B Stars, M Stars

Scientific paper

A photometric search for eclipses in Delta Sge, an M2 II + B7 V binary system, has been carried out with UBV data from the Automatic Photoelectric Telescope Service. None have been found, although at the predicted time of conjunction there was a small but significant decrease in (U - B). However, since this phase is one at which the M star is (nearly) in front of the B star it is unlikely that a bluer (U - B) could signal an atmospheric eclipse. Possibly it is due to heating induced by a reduced separation of the stars at periastron (e = 0.41), which occurs only about a month before conjunction. The M star was found to have dominant pulsation periods of about 40 and 24 days.

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