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Open Access Articles- Top Results for Chi Aquarii

Chi Aquarii

Chi Aquarii <tr><td colspan="2" style="text-align:center;">

Location of χ Aquarii (circled)
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Observation data
Epoch J2000      Equinox J2000
Constellation Aquarius
Right ascension 23h 16m 50.93916s[1]
Declination −07° 43′ 35.4023″[1]
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This page is a soft redirect. Apparent magnitude (V)

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This page is a soft redirect. +5.06[2]

Characteristics
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This page is a soft redirect. Spectral type

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This page is a soft redirect. M3 III[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. +1.60[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. +1.60[2]

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This page is a soft redirect. Variable type

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This page is a soft redirect. Semi-regular[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>Radial velocity (Rv)</td><td>–13.72 ± 0.86[5] km/s</td></tr><tr style="vertical-align:top;"><td>Proper motion (μ)</td><td> RA: −19.18[1] mas/yr
Dec.: −14.10[1] mas/yr </td></tr><tr style="vertical-align:top;"><td>Parallax (π)</td><td>5.32 ± 0.37[1] mas</td></tr><tr style="vertical-align:top;"><td>Distance</td><td>610 ± 40 ly
(190 ± 10 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>Radius</td><td>137[6] R</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">
92 Aquarii, BD−08 6076, HD 219576, HIP 114939, HR 8850, SAO 146612.[7]
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Data sources:
Hipparcos Catalogue,
CCDM (2002),
Bright Star Catalogue (5th rev. ed.) </div>

Chi Aquarii (χ Aqr, χ Aquarii) is the Bayer designation of a star in the equatorial constellation of Aquarius. The distance to this star, based upon parallax measurements with a 7% margin of error, is roughly Script error: No such module "convert"..[1] It is visible to the naked eye with an apparent visual magnitude of +5.06.[2]

This is a red giant star with a spectral classification of M3 III.[3] The interferometry-measured angular diameter of this star is 6.70 ± 0.15 mas,[8] which, at its estimated distance, equates to a physical radius of about 137 times the radius of the Sun.[6] It is classified as a semi-regular variable star and its brightness varies by an amplitude of 0.0636 in magnitude.[9] The identified pulsation periods are 32.3, 38.5, and 44.9 days.[4]

References

  1. 1.0 1.1 1.2 1.3 1.4 1.5 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. 2.0 2.1 2.2 2.3 Nicolet, B. (1978), "Photoelectric photometric Catalogue of homogeneous measurements in the UBV System", Astronomy and Astrophysics Supplement Series 34: 1–49, Bibcode:1978A&AS...34....1N. 
  3. 3.0 3.1 Crampton, D.; Lloyd Evans, T. (1973), "Spectroscopic observations of M giant stars at the South Galactic Pole", Monthly Notices of the Royal Astronomical Society 162: 11–15, Bibcode:1973MNRAS.162...11C. 
  4. 4.0 4.1 Tabur, V. et al. (December 2009), "Long-term photometry and periods for 261 nearby pulsating M giants", Monthly Notices of the Royal Astronomical Society 400 (4): 1945–1961, Bibcode:2009MNRAS.400.1945T, arXiv:0908.3228, doi:10.1111/j.1365-2966.2009.15588.x. 
  5. Famaey, B. et al. (May 2009), "Spectroscopic binaries among Hipparcos M giants. I. Data, orbits, and intrinsic variations", Astronomy and Astrophysics 498 (2): 627–640, Bibcode:2009A&A...498..627F, arXiv:0901.0934, doi:10.1051/0004-6361/200810698. 
  6. 6.0 6.1 Lang, Kenneth R. (2006), Astrophysical formulae, Astronomy and astrophysics library 1 (3rd ed.), Birkhäuser, ISBN 3-540-29692-1 . The radius (R*) is given by:
    <math>\begin{align} 2\cdot R_*
    & = \frac{((190\cdot 6.70\cdot 10^{-3})\ \text{AU}}{0.0046491\ \text{AU}/R_{\bigodot}} \\ & \approx 274\cdot R_{\bigodot} \end{align}</math>
  7. "chi Aqr -- Semi-regular pulsating Star", SIMBAD (Centre de Données astronomiques de Strasbourg), retrieved 2012-07-05. 
  8. Richichi, A.; Percheron, I.; Khristoforova, M. (February 2005), "CHARM2: An updated Catalog of High Angular Resolution Measurements", Astronomy and Astrophysics 431: 773–777, Bibcode:2005A&A...431..773R, doi:10.1051/0004-6361:20042039. 
  9. Koen, Chris; Eyer, Laurent (March 2002), "New periodic variables from the Hipparcos epoch photometry", Monthly Notices of the Royal Astronomical Society 331 (1): 45–59, Bibcode:2002MNRAS.331...45K, arXiv:astro-ph/0112194, doi:10.1046/j.1365-8711.2002.05150.x. 

External links