Astronomy:Nu Aquarii

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Short description: Star in the constellation Aquarius
ν Aquarii
Location of ν Aquarii (circled)
Observation data
Equinox J2000.0]] (ICRS)
Constellation Aquarius
Right ascension  21h 09m 35.648s[1]
Declination −11° 22′ 18.09″[1]
Apparent magnitude (V) 4.520[2]
Characteristics
Spectral type G8 III[3]
U−B color index +0.66[4]
B−V color index +0.943[5]
Astrometry
Radial velocity (Rv)−11.23[5] km/s
Proper motion (μ) RA: +93.613[1] mas/yr
Dec.: −15.494[1] mas/yr
Parallax (π)20.0842 ± 0.1137[1] mas
Distance162.4 ± 0.9 ly
(49.8 ± 0.3 pc)
Absolute magnitude (MV)+0.93[6]
Details
Mass2.35[6] M☉
Radius8[5] R☉
Luminosity37[5] L☉
Surface gravity (log g)2.88±0.09[2] cgs
Temperature4,920±5[5] K
Metallicity [Fe/H]−0.06±0.04[2] dex
Rotational velocity (v sin i)2.8±0.3[7] km/s
Age708[6] Myr
Other designations
ν Aquarii, ν Aqr, Nu Aqr, 13 Aquarii, BD−11 5538, HD 201381, HIP 104459, HR 8093, SAO 164182[8]
Database references
SIMBADdata

Nu Aquarii is a star in the equatorial constellation of Aquarius. The name is a Bayer designation that is Latinized from ν Aquarii, and abbreviated Nu Aqr or ν Aqr. With an apparent visual magnitude of 4.52,[4] Nu Aquarii is faintly visible to the naked eye. Its distance from Earth, as determined from parallax measurements, is 162 light-years (50 parsecs). The star is drifting closer to the Sun with a radial velocity of −11 km/s.[5]

At an estimated age of 708 million years,[6] Nu Aquarii has exhausted the supply of hydrogen at its core and evolved into a giant star with a spectrum that matches a stellar classification of G8 III.[3] It has double the mass of the Sun[6] and has expanded to eight[5] times the Sun's radius. Nu Aquarii is radiating 37 times[5] the luminosity of the Sun from its photosphere at an effective temperature of 4,920 K.[5] At this heat, the star is glowing with the yellowish hue of a G-type star.[9]

Together with μ Aquarii, it is Albulaan /ˌælbjəˈlɑːn/, a name derived from the Arabic term al-bulaʽān (ألبولعان), meaning "the two swallowers". This star, along with ε Aqr (Albali) and μ Aqr (Albulaan), were al Bulaʽ (البلع)—the Swallower.[10][11]

In Chinese, 天壘城 (Tiān Lěi Chéng), meaning Celestial Ramparts, refers to an asterism consisting of ν Aquarii, ξ Aquarii, 46 Capricorni, 47 Capricorni, λ Capricorni, 50 Capricorni, 18 Aquarii, 29 Capricorni, 9 Aquarii, 8 Aquarii, 14 Aquarii, 17 Aquarii and 19 Aquarii.[12] Consequently, the Chinese name for ν Aquarii itself is 天壘城十 (Tiān Lěi Chéng shí, English: the Tenth Star of Celestial Ramparts).[13]

References

  1. ↑ 1.0 1.1 1.2 1.3 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940  Gaia DR3 record for this source at VizieR.
  2. ↑ 2.0 2.1 2.2 Soubiran, C. et al. (July 1, 2022), "Assessment of [Fe/H] determinations for FGK stars in spectroscopic surveys", Astronomy and Astrophysics 663: A4, doi:10.1051/0004-6361/202142409, ISSN 0004-6361, Bibcode: 2022A&A...663A...4S. 
  3. ↑ 3.0 3.1 Buscombe, W. (1962), "Spectral classification of Southern fundamental stars", Mount Stromlo Observatory Mimeogram 4: 1, Bibcode: 1962MtSOM...4....1B. 
  4. ↑ 4.0 4.1 Johnson, H. L. et al. (1966), "UBVRIJKL photometry of the bright stars", Communications of the Lunar and Planetary Laboratory 4 (99): 99, Bibcode: 1966CoLPL...4...99J. 
  5. ↑ 5.0 5.1 5.2 5.3 5.4 5.5 5.6 5.7 5.8 Massarotti, Alessandro et al. (January 2008), "Rotational and Radial Velocities for a Sample of 761 HIPPARCOS Giants and the Role of Binarity", The Astronomical Journal 135 (1): 209–231, doi:10.1088/0004-6256/135/1/209, Bibcode: 2008AJ....135..209M. 
  6. ↑ 6.0 6.1 6.2 6.3 6.4 Takeda, Yoichi et al. (August 2008), "Stellar parameters and elemental abundances of late-G giants", Publications of the Astronomical Society of Japan 60 (4): 781–802, doi:10.1093/pasj/60.4.781, Bibcode: 2008PASJ...60..781T. 
  7. ↑ Gray, David F. (1989), "The rotational break for G giants", Astrophysical Journal 347: 1021–1029, doi:10.1086/168192, Bibcode: 1989ApJ...347.1021G. 
  8. ↑ "nu. Aqr". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=nu.+Aqr. 
  9. ↑ "The Colour of Stars", Australia Telescope, Outreach and Education (Commonwealth Scientific and Industrial Research Organisation), December 21, 2004, http://outreach.atnf.csiro.au/education/senior/astrophysics/photometry_colour.html, retrieved 2012-07-02. 
  10. ↑ Davis Jr., G. A. (October 1944), "The Pronunciations, Derivations, and Meanings of a Selected List of Star Names", Popular Astronomy 52 (3): 12, Bibcode: 1944PA.....52....8D. 
  11. ↑ Allen, R. H. (1963), Star Names: Their Lore and Meaning (Reprint ed.), New York: Dover Publications Inc, p. 53, ISBN 0-486-21079-0, https://archive.org/details/starnamestheirlo00alle/page/53, retrieved 2010-12-12. 
  12. ↑ Script error: The function "in_lang" does not exist. 中國星座神話, written by 陳久金. Published by 台灣書房出版有限公司, 2005, ISBN 978-986-7332-25-7.
  13. ↑ Script error: The function "in_lang" does not exist. AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 5 月 15 日



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