29 Aquarii

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29 Aquarii
Observation data
Epoch J2000      Equinox J2000
Constellation Aquarius
Right ascension 22h 02m 26.24906s[1]
Declination −16° 57′ 53.4077″[1]
Apparent magnitude (V) 6.37
Characteristics
Spectral type A2 V + K0 III[2]
B−V color index 0.42
Astrometry
Radial velocity (Rv) 15 km/s
Proper motion (μ) RA: +6.26[1] mas/yr
Dec.: –0.51[1] mas/yr
Parallax (π) 3.70 ± 1.99[1] mas
Distance approx. 900 ly
(approx. 300 pc)
Other designations
DX Aquarii, BD-17 6422, HD 209278, HIP 108797, HR 8396, SAO 164830.[3]

29 Aquarii is the Flamsteed designation for a binary star system in the equatorial constellation of Aquarius. The orbital plane of the two stars lies near the line of sight, so they form an Algol-type eclipsing binary with the variable star designation DX Aquarii. The first component of the system is an A-type main sequence star with a stellar classification of A2 V. Its companion is giant star with a classification of K0 III. Their orbital period is 0.94501 days.[2]

Stellar system[edit]

The variability of this star was first noticed in 1965 by W. Strohmeier of Remeis-Observatory in Bamberg, Germany.[4] He later discovered that the variability was caused by a binary companion eclipsing the primary star.[5]

References[edit]

  1. ^ a b c d e van Leeuwen, F. (November 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. 
  2. ^ a b Zasche, P. et al. (August 2009), A Catalog of Visual Double and Multiple Stars With Eclipsing Components, The Astronomical Journal 138 (2): 664–679, arXiv:0907.5172, Bibcode:2009AJ....138..664Z, doi:10.1088/0004-6256/138/2/664. 
  3. ^ BD-17 6422 -- Spectroscopic binary, SIMBAD Astronomical Object Database (Centre de Données astronomiques de Strasbourg), retrieved 2012-07-16. 
  4. ^ Strohmeier, W. et al. (1965). "Bright Southern BV-Stars". Information Bulletin On Variable Stars 81. Bibcode:1965IBVS...81....1S. 
  5. ^ Strohmeier, W. (1966). "BV 449 and BV 600, Two Bright EB-Stars". Information Bulletin On Variable Stars 164. Bibcode:1966IBVS..164....1S. 

External links[edit]