101 Virginis Explained

101 Virginis is a red giant variable star in the Boötes constellation, currently on the asymptotic giant branch.[1] It was originally catalogued as 101 Virginis by Flamsteed due to an error in the position.[2] [3] When it was confirmed as a variable star, it was actually within the border of the constellation Boötes and given the name CY Boötis.

The variability is not strongly defined but a primary period of 23 days and a secondary period of 340 days have been reported.[4]

CY Boo is listed in the Hipparcos catalogue as a "problem binary", a star which was suspected of being multiple but for which the Hipparcos observations did not give a satisfactory solution. Further observations have always shown it to be single.[5]

External links

Notes and References

  1. Asymptotic giant branch stars near the sun . The Astronomical Journal . 104 . 275 . 1992 . Eggen . Olin J. . 10.1086/116239 . 1992AJ....104..275E.
  2. Davies . H. S. . 1905 . Flamsteed and Piazzi Identities . . 13 . 423 . 1905PA.....13..423D.
  3. Wagman . M. . 1987 . Flamsteed's Missing Stars . . 18 . 3 . 209 . 1987JHA....18..209W . 10.1177/002182868701800305. 118445625 .
  4. Percy. J. R. . Dunlop. H. . Kassim. L. . Thompson. R. R. . 2001 . Periods of 25 Pulsating Red Giants . . 5041 . 1 . 2001IBVS.5041....1P.
  5. 1999AJ....117.1890M . Speckle Interferometry of New and Problem HIPPARCOS Binaries . The Astronomical Journal . 117 . 4 . 1890 . Mason . Brian D. . Martin . Christian . Hartkopf . William I. . Barry . Donald J. . Germain . Marvin E. . Douglass . Geoffrey G. . Worley . Charles E. . Wycoff . Gary L. . Ten Brummelaar . Theo . Franz . Otto G. . 1999 . 10.1086/300823 . free .

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