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10 Lacertae

Star in the constellation Lacerta

Summary

Star in the constellation Lacerta

| b-v = −0.210 | u-b = −1.010

10 Lacertae (10 Lac) is a star in the constellation Lacerta. With an apparent magnitude of 4.9, it is located around 550 pc distant in the small Lacerta OB1 association. It is a hot blue main-sequence star of spectral type O9V, a massive star that is currently fusing its core hydrogen. It is a suspected Beta Cephei variable star.

It was one of the first O-type stars (along with S Monocerotis) to be defined as an anchor point for the MKK spectral classification; since the early twentieth century it has served as such a point. Specifically, the star is representative of O9V stars, meaning relatively cool O-type stars on the main-sequence.

It is the star with the smallest angular diameter measured by the CHARA array , at .

10 Lacertae has an 8th magnitude companion about one arc-minute away.

References

References

  1. (September 1993). "UBV photometry of stars whose positions are accurately known. VII". Astronomy and Astrophysics Supplement Series.
  2. (January 2009). "VizieR On-line Data Catalog: General Catalogue of Variable Stars". VizieR On-line Data Catalog.
  3. (2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters.
  4. {{cite DR3. 1908095850396090880
  5. (2023-03-01). "Quantitative spectroscopy of late O-type main-sequence stars with a hybrid non-LTE method". Astronomy and Astrophysics.
  6. (1994). "A Hierarchy of Standards for the MK Process". [[Astronomical Society of the Pacific]].
  7. (December 2018). "Angular Sizes and Effective Temperatures of O-type Stars from Optical Interferometry with the CHARA Array". The Astrophysical Journal.
  8. (1994). "Catalogue of the Components of Double and Multiple stars (CCDM). First edition.". Communications de l'Observatoire Royal de Belgique.
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lacerta o-type-main-sequence-stars flamsteed-objects bright-star-catalogue-objects hipparcos-objects henry-draper-catalogue-objects durchmusterung-objects
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