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74 Aquarii

74 Aquarii
Observation data
Epoch J2000      Equinox J2000
Constellation Aquarius
Right ascension 22h 53m 28.70347s[1]
Declination –11° 36′ 59.4532″[1]
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This page is a soft redirect. Apparent magnitude (V)

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This page is a soft redirect. 5.791[2]

Characteristics
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This page is a soft redirect. Spectral type

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This page is a soft redirect. B8IV/V[3]

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This page is a soft redirect. U−B color index

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This page is a soft redirect. –0.245[2]

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This page is a soft redirect. B−V color index

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This page is a soft redirect. –0.082[2]

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This page is a soft redirect. Variable type

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This page is a soft redirect. a2 CVn[4] <tr><th style="background-color: #FFFFC0; text-align: center;" colspan="2">Astrometry</th></tr></th></tr><tr><th colspan="2" style="text-align: center"></tr><tr style="vertical-align:top;"><td>Proper motion (μ)</td><td> RA: +20.81[1] mas/yr
Dec.: +1.69[1] mas/yr </td></tr><tr style="vertical-align:top;"><td>Parallax (π)</td><td>4.96 ± 0.84[1] mas</td></tr><tr style="vertical-align:top;"><td>Distance</td><td>approx. 700 ly
(approx. 200 pc)</td></tr><tr><th colspan="2" style="text-align: center"></th></tr> <tr><th style="background-color: #FFFFC0; text-align: center;" colspan="2">Details</th></tr></th></tr><tr><th colspan="2" style="text-align: center"></th></tr><tr style="vertical-align:baseline;"><td>Rotational velocity (v sin i)</td><td>20[5] km/s</td></tr><tr><th colspan="2" style="text-align: center"></th></tr>

<tr><th style="background-color: #FFFFC0; text-align: center;" colspan="2">Other designations</th></tr><tr><td colspan="2">
HI Aqr, BD–12 6371, HD 216494, HIP 113031, HR 8704, SAO 165359.[4]
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74 Aquarii is a triple star[6] system in the constellation Aquarius. The combined apparent visual magnitude is 5.8[2] and it is located at a distance of Script error: No such module "convert". from Earth.[1] It has the variable star designation HI Aquarii.

The inner pair of stars form a double-lined spectroscopic binary, where the presence of both components is revealed from the Doppler shift of their spectral lines. They have an orbital period of 3.4298 days. A third component is orbiting the inner pair with an 18 year period at a typical angular separation of 0.078 arcseconds. In 2010, this component was at an angular separation of 0.069 arcseconds along a position angle of 285.9°. This is equivalent to a projected linear separation of 13.9 ± 2.4 AU.[6]

References

  1. ^ a b c d e f van Leeuwen, F. (November 2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics 474 (2): 653–664, Bibcode:2007A&A...474..653V, arXiv:0708.1752, doi:10.1051/0004-6361:20078357. 
  2. ^ a b c d Gutierrez-Moreno, Adelina et al. (1966), A System of photometric standards 1, Publicaciones Universidad de Chile, Department de Astronomy, pp. 1–17, Bibcode:1966PDAUC...1....1G. 
  3. ^ Houk, Nancy (1978), Michigan catalogue of two-dimensional spectral types for the HD stars 4, Ann Arbor: Dept. of Astronomy, University of Michigan, Bibcode:1988mcts.book.....H. 
  4. ^ a b "HI Aqr -- Variable Star of alpha2 CVn type", SIMBAD Astronomical Object Database (Centre de Données astronomiques de Strasbourg), retrieved 2012-07-01. 
  5. ^ Abt, Helmut A.; Levato, Hugo; Grosso, Monica (July 2002), "Rotational Velocities of B Stars", The Astrophysical Journal 573 (1): 359–365, Bibcode:2002ApJ...573..359A, doi:10.1086/340590. 
  6. ^ a b Schöller, M. et al. (November 2010), "Multiplicity of late-type B stars with HgMn peculiarity", Astronomy and Astrophysics 522: A85, Bibcode:2010A&A...522A..85S, arXiv:1010.3643, doi:10.1051/0004-6361/201014246. 

External links