KU Hydrae

The topic of KU Hydrae is widely known and discussed today. Since people began to talk about KU Hydrae, it has generated great interest and has been the subject of numerous studies and research. In this article we will analyze different aspects related to KU Hydrae, from its origin and evolution to its impact on current society. In addition, we will explore the different opinions and perspectives that exist around KU Hydrae, with the aim of providing a complete and enriching vision of this very relevant topic.

KU Hydrae

A visual band light curve for KU Hydrae, adapted from Adelman (2006)[1]
Observation data
Epoch J2000      Equinox J2000
Constellation Hydra[2]
Right ascension 09h 22m 50.856s[3]
Declination −09° 50′ 19.66″[3]
Apparent magnitude (V) 6.75[4]
Characteristics
Spectral type Ap EuCrSr[5]
U−B color index +0.11[6]
B−V color index +0.22[6]
Variable type α2 CVn
Astrometry
Radial velocity (Rv)19.6 ± 5.0 km/s
Proper motion (μ) RA: −27.94 ± 0.61[3] mas/yr
Dec.: −13.01 ± 0.36[3] mas/yr
Parallax (π)6.92±0.61 mas[3]
Distance470 ± 40 ly
(140 ± 10 pc)
Orbit[7]
CompanionKU Hya B
Period (P)52.98(37) yr
Semi-major axis (a)0.169(1)″
Eccentricity (e)0.074(8)
Inclination (i)68.5(6)°
Longitude of the node (Ω)202.4(4)°
Periastron epoch (T)2020.20(45)
Argument of periastron (ω)
(secondary)		58.7(3.3)°
Details[8]
KU Hya A
Mass2.07 M☉
KU Hya B
Mass2.05 M☉
Other designations
BD−09° 2816, HD 81009, HIP 45999, HR 3724, SAO 136799, A 1342[5]
Database references
SIMBADdata

KU Hydrae is a binary star in the constellation Hydra. The primary star is an Alpha2 Canum Venaticorum variable with its apparent magnitude varying from 0.05 magnitudes over a period of 33.97 days.[8]

This star was discovered to be a visual binary star by Robert Grant Aitken in 1906 and was given the double star designation A 1342.[9] Additional measurements of the position angle and angular separation showed a rapid orbital motion.[10]

References

  1. ^ Adelman, Saul J. (January 2006). "FCAPT uvby Photometry of the mCP Stars HD 20629, HR 3724, 45 Leo, and HD 192678". Publications of the Astronomical Society of the Pacific. 118 (839): 77–83. Bibcode:2006PASP..118...77A. doi:10.1086/498223.
  2. ^ Roman, Nancy G. (1987). "Identification of a Constellation From a Position". Publications of the Astronomical Society of the Pacific. 99 (617): 695–699. Bibcode:1987PASP...99..695R. doi:10.1086/132034. Vizier query form
  3. ^ a b c d e van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. S2CID 18759600.Vizier catalog entry
  4. ^ Ducati, J. R. (2002). "VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system". CDS/ADC Collection of Electronic Catalogues. 2237. Bibcode:2002yCat.2237....0D.
  5. ^ a b "V* KU Hya". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2014-09-01.
  6. ^ a b Johnson, H. L. (1966). "UBVRIJKL Photometry of the Bright Stars". Communications of the Lunar and Planetary Laboratory. 4: 99. Bibcode:1966CoLPL...4...99J.
  7. ^ Tokovinin, Andrei; et al. (2015-07-17). "Speckle Interferometry at SOAR in 2014". The Astronomical Journal. 150 (2) 50. arXiv:1506.05718. Bibcode:2015AJ....150...50T. doi:10.1088/0004-6256/150/2/50.
  8. ^ a b Rica Romero, F. M. (2010). "Orbital elements for eight binaries. Study of the nature of wide components. I" (PDF). Revista Mexicana de Astronomía y Astrofísica. 46: 263–277. Bibcode:2010RMxAA..46..263R. Archived from the original (PDF) on 2014-02-25. Retrieved 2014-09-01.
  9. ^ Aitken, Robert Grant (1907). "Two hundred and fifty new double stars: tenth list". Lick Observatory Bulletin. 4 (109): 101–106. Bibcode:1907LicOB...4..101A. doi:10.5479/ADS/bib/1907LicOB.4.101A.
  10. ^ Aitken, Robert Grant (1929). "Measures of 296 A double stars". Lick Observatory Bulletin. 14 (413): 62–87. Bibcode:1929LicOB..14...62A. doi:10.5479/ADS/bib/1929LicOB.14.62A.


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