11 Orionis Explained

11 Orionis is a solitary^[1] Ap star in the equatorial constellation of Orion, near the border with Taurus. It is visible to the naked eye with an apparent visual magnitude of 4.65, and it is located approximately 365 light years away from the Sun based on parallax. The star is moving further from the Sun with a heliocentric radial velocity of +16.8 km/s.

This object is a chemically peculiar star, known as an Ap star, with enhanced silicon and chromium lines in its spectrum.^[2] It is an α² CVn variable, ranging from 4.65 to 4.69 magnitude with a period of 4.64 days. The magnetic field measured from metal lines has a strength of .^[3]

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 . 2008MNRAS.389..869E . 0806.2878 . 14878976 .
2. 2014A&A...562A..65S . 1402.1021 . Spectrophotometric analysis of the 5200 Å region for peculiar and normal stars . Astronomy & Astrophysics . 562 . A65 . Stigler . Ch. . Maitzen . H. M. . Paunzen . E. . Netopil . M. . 2014 . 10.1051/0004-6361/201322300 . 55166743 .
3. Results of magnetic field measurements of CP-stars performed with the 6-m telescope. III. Observations in 2009 . 1 . Romanyuk . I. I. . Semenko . E. A. . Kudryavtsev . D. O. . Moiseevaa . A. V. . Astrophysical Bulletin . 71 . 3 . 302–313 . July 2016 . 10.1134/S1990341316030056 . 2016AstBu..71..302R . 125202761 .