Astronomy:14 Aquarii

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Short description: Star in the constellation Aquarius
14 Aquarii
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A light curve for IW Aquarii, plotted from Hipparcos data[1]
Observation data
Equinox J2000.0]] (ICRS)
Constellation Aquarius
Right ascension  21h 16m 17.7734s[2]
Declination −09° 12′ 52.795″[2]
Apparent magnitude (V) 6.44 - 6.55[3]
Characteristics
Evolutionary stage red giant branch[2]
Spectral type M4III:[4]
B−V color index 1.57[5]
Variable type SRb[3]
Astrometry
Radial velocity (Rv)8.00[6] km/s
Proper motion (μ) RA: −1.597[2] mas/yr
Dec.: +3.549[2] mas/yr
Parallax (π)2.4622 ± 0.0685[2] mas
Distance1,320 ± 40 ly
(410 ± 10 pc)
Absolute magnitude (MV)−2.3[4]
Details[2]
Mass1.9 M☉
Radius106 R☉
Luminosity2,145 L☉
Surface gravity (log g)+0.36 cgs
Temperature3,542 K
Metallicity [Fe/H]−0.4 dex
Age1.5 Gyr
Other designations
IW Aquariii, BD−09°5700, HD 202466, HIP 105019, SAO 145251.
Database references
SIMBADdata

14 Aquarii (abbreviated 14 Aqr) is red giant star. 14 Aquarii is the Flamsteed designation; it also bears the variable star designation IW Aquarii. It is a semiregular variable with an amplitude of a tenth of a magnitude, and shows variations on a timescale of just one day.[4] At its brightest, magnitude 6.44,[7] it could be faintly visible to the naked eye under ideal observing conditions.

In 1996 the variability of the brightness of 14 Aquarii was first detected, in the Hipparcos satellite data, resulting in the publication of its variable star designation in 1999.[8]

References

  1. ↑ "/ftp/cats/more/HIP/cdroms/cats". Strasbourg astronomical Data Center. https://cdsarc.cds.unistra.fr/viz-bin/ftp-index?/ftp/cats/more/HIP/cdroms/cats. 
  2. ↑ 2.0 2.1 2.2 2.3 2.4 2.5 2.6 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.
  3. ↑ 3.0 3.1 "14 Aqr". AAVSO. https://www.aavso.org/vsx/index.php?view=detail.top&oid=1085. 
  4. ↑ 4.0 4.1 4.2 Koen, Chris; Laney, Dave (2000). "Rapidly oscillating M giant stars?". Monthly Notices of the Royal Astronomical Society 311 (3): 636. doi:10.1046/j.1365-8711.2000.03127.x. Bibcode: 2000MNRAS.311..636K. 
  5. ↑ Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P. et al. (2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics 355: L27. doi:10.1888/0333750888/2862. Bibcode: 2000A&A...355L..27H. 
  6. ↑ Kharchenko, N. V.; Scholz, R.-D.; Piskunov, A. E.; Röser, S.; Schilbach, E. (2007). "Astrophysical supplements to the ASCC-2.5: Ia. Radial velocities of ˜55000 stars and mean radial velocities of 516 Galactic open clusters and associations". Astronomische Nachrichten 328 (9): 889. doi:10.1002/asna.200710776. Bibcode: 2007AN....328..889K. 
  7. ↑ "IW Aqr". AAVSO. https://www.aavso.org/vsx/index.php?view=detail.top&oid=1085. 
  8. ↑ Kazarovets, E. V.; Samus, N. N.; Durlevich, O. V.; Frolov, M. S.; Antipin, S. V.; Kireeva, N. N.; Pastukhova, E. N. (January 1999). "The 74th Special Name-list of Variable Stars". Information Bulletin on Variable Stars 4659: 1–27. Bibcode: 1999IBVS.4659....1K. https://ibvs.konkoly.hu/pub/ibvs/4601/4659.pdf. Retrieved 20 November 2024. 



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