Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009an....330..733b&link_type=abstract
Astronomische Nachrichten, Vol.330, Issue 7, p.733
Astronomy and Astrophysics
Astronomy
Binaries: Eclipsing, Rr Lyrae Stars, Stars: Fundamental Parameters
Scientific paper
The variable star SU Equulei was classified as a close binary with an eclipse light curve previously categorized as W UMa type. The aim of this paper is a review of this old classification on the basis of new observations and a new determination of variable star ephemeris as well as the determination of SU Equ spectral type and distance. New photometric observations in different colours allow a precise determination of the period of variability and yield more accurate light curves allowing a re-classification of the type of variability. We find the best period of variability to be half the old value. The shape of the light curve is inconsistent with an eclipse curve but consistent with an RR Lyrae type c classification. From the B, V, and R colours we deduce a new spectral classification. SU Equulei is an RRc Lyrae type variable of spectral class A8 at a distance of ≈12.4 kpc instead of a late-type eclipsing binary.
Behre O.
Hempelmann Alexander
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