Lambda Hydrae Explained

λ Hydrae, Latinised as Lambda Hydrae, is a spectroscopic binary[1] star in the constellation Hydra. Its apparent magnitude is 3.61 Located around 33.3pc distant. The spiral galaxy NGC 3145 is only away to the southwest.

The primary is an orange giant of spectral type K0IIICN+1,[2] a star that has used up its core hydrogen, left the main sequence, and expanded into a giant. It is considered to be a red clump giant, a cool horizontal branch star that is burning helium in its core.[3]

λ Hydrae has two visual companions, components B and C, 11th and 13th magnitude stars respectively and away.[4]

Notes and References

  1. Eggleton . P. P. . Tokovinin . A. A. . A catalogue of multiplicity among bright stellar systems . . 389 . 2 . 869–879 . September 2008 . 10.1111/j.1365-2966.2008.13596.x . free . 2008MNRAS.389..869E . 0806.2878. 14878976 .
  2. 1 . Gray . R. O. . Corbally . C. J. . Garrison . R. F. . McFadden . M. T. . Bubar . E. J. . McGahee . C. E. . O'Donoghue . A. A. . Knox . E. R. . Contributions to the Nearby Stars (NStars) Project: spectroscopy of stars earlier than M0 within 40 pc-The Southern Sample . . 132 . 1 . 161–170 . July 2006 . 10.1086/504637 . 2006AJ....132..161G . astro-ph/0603770. 119476992 .
  3. 2000ApJ...539..732A. K-Band Calibration of the Red Clump Luminosity. The Astrophysical Journal. 539. 2. 732–741. Alves. David R.. 2000. 10.1086/309278. astro-ph/0003329. free.
  4. 2001AJ....122.3466M. The 2001 US Naval Observatory Double Star CD-ROM. I. The Washington Double Star Catalog. The Astronomical Journal. 122. 6. 3466. Mason. Brian D.. Wycoff. Gary L.. Hartkopf. William I.. Douglass. Geoffrey G.. Worley. Charles E.. 2001. 10.1086/323920. free.

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