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OP Andromedae

Variable star in the constellation Andromeda

Variable star in the constellation Andromeda

| b-v = 1.2478 | u-b =

OP Andromedae is a variable star in the constellation Andromeda. Varying between magnitudes 6.27 and 6.41 over 2.36 days, it has been classified as an RS Canum Venaticorum variable, but there has not been any proof of binarity, yet. It is a red giant star with a spectral classification of K1III.

OP Andromedae is one of the few red giant stars where it was detected an overabundance of 7Li. The mechanism that enhances lithium in red giants is still unknown. It was proposed that those stars engulfed planets in the recent past; however, this theory was discarded since there is an overabundance of just one lithium isotope.

References

References

  1. {{cite DR2. 399594587467372544
  2. (1984). "Discovery that HR 454 is a Variable Star". Information Bulletin on Variable Stars.
  3. "OP And database entry". [[Centre de Données astronomiques de Strasbourg.
  4. (2000). "Two K Giants with Supermeteoritic Lithium Abundances: HDE 233517 and HD 9746". The Astrophysical Journal.
  5. (2003). "VizieR Online Data Catalog: 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)". CDS/ADC Collection of Electronic Catalogues.
  6. (August 2017). "On the observational characteristics of lithium-enhanced giant stars in comparison with normal red giants". Publications of the Astronomical Society of Japan.
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andromeda-(constellation) henry-draper-catalogue-objects objects-with-variable-star-designations k-type-giants rs-canum-venaticorum-variables bright-star-catalogue-objects hipparcos-objects durchmusterung-objects
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