RY Lep: a dwarf Cepheid hits a midlife crisis

Details RY Lep: a dwarf Cepheid hits a midlife crisis RY Lep: a dwarf Cepheid hits a midlife crisis

Feb 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aspc..256..173l&link_type=abstract

Observational Aspects of Pulsating B- and A Stars, ASP Conference Proceedings, Vol. 256. Edited by Christiaan Sterken and Donal

Astronomy and Astrophysics

Astronomy

2

Scientific paper

RY Lep is a dwarf Cepheid (HADS) with a period of about 0.2251d. Published optical photometry and JK photometry from 1985-97 appeared to show stable monoperiodic behaviour, but radial velocities and infra-red photometry from 2000 January -February show aperiodic (or possibly multiperiodic) variations not consistent with previous observations. An apparently similar anomalous interval can be seen in the hipparcos epoch photometry. RY Lep appears to have a normal temperature, radius and luminosity for a HADS with a period of 0.225d, occasional bursts of weirdness notwithstanding. Although the radial velocities clearly show binary motion, the period is more than 500d, making binary interaction unlikely.

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