On Cassini's early 'observations' of Beta Lyrae

Details On Cassini's early 'observations' of Beta Lyrae On Cassini's early 'observations' of Beta Lyrae

Mar 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987pasp...99..186h&link_type=abstract

Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 99, March 1987, p. 186-190. NSF-supported research.

Astronomy and Astrophysics

Astronomy

2

Eclipsing Binary Stars, Ephemeris Time, Stellar Luminosity, Variable Stars

Scientific paper

Cassini, in his observations of Nova Vul in 1671, repeatedly used β Lyr for brightness comparison, apparently without even suspecting that it was a variable star. An attempt was made to correlate Cassini's "indirect" observations of β Lyr with modern ephemeris formulae in order to find out whether he could have overlooked a primary eclipse. None of the modern ephemeris formulae would allow a reliable extrapolation of minimum epochs back to 1671, but the coverage of the light curve by the unintended observations suggests perhaps a modest chance that the 17th-century observers missed the variable near its primary minimum.

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