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Omega2 Aquarii

From Wikipedia, the free encyclopedia
Star in the constellation Aquarius
For other stars with this Bayer designation, seeω Aquarii.
Omega2 Aquarii
Location of ω2 Aquarii (circled)
Observation data
Epoch J2000      Equinox J2000
ConstellationAquarius[1]
Right ascension23h 42m 43.345s[2]
Declination−14° 32′ 41.66″[2]
Apparent magnitude (V)4.49[3]
Characteristics
Spectral typeB9 V[4] + A5V[5]
U−Bcolor index−0.12[3]
B−Vcolor index−0.04[3]
Astrometry
Radial velocity (Rv)+3.2±2.3[6] km/s
Proper motion (μ)RA: +98.578mas/yr[2]
Dec.: −66.231mas/yr[2]
Parallax (π)20.8948±0.1589 mas[2]
Distance156 ± 1 ly
(47.9 ± 0.4 pc)
Absolute magnitude (MV)+1.20[1]
Details
A
Mass2.6+0.15
−0.14[7] M☉
Radius1.94±0.06[8] R☉
Luminosity37[1] L☉
Surface gravity (log g)4.22±0.03[8] cgs
Temperature10,504±91[8] K
Rotation10.6546 h[9]
Rotational velocity (v sin i)148[10] km/s
Age109+90
−70[7] Myr
Other designations
ω2 Aqr,105 Aquarii,BD−15 6476,FK5 894,GC 32931,GJ 9836,HD 222661,HIP 116971,HR 8988,SAO 165842,PPM 242001,WDS J23427-1433A[11]
Database references
SIMBADdata

Omega2 Aquarii is astar[12] system in theequatorialconstellation ofAquarius. Its name is aBayer designation that isLatinised from ω2 Aquarii, and abbreviated Omega2 Aqr or ω2 Aqr. The system can be seen with thenaked eye as a faint point of light, having anapparent visual magnitude of 4.49.[3] The approximate distance to thisstar, 149light-years (46parsecs), is known fromparallax measurements.[2]

This is aB-type main-sequence star with astellar classification of B9 V.[4] In 1953, astronomersH. L. Johnson andW. W. Morgan selected it as theMK standard for stars of class B9.5V.[13] It has an estimated age of 109[7] million years and is spinning rapidly with aprojected rotational velocity of 148 km/s,[10] giving it arotation period of 10.6546 h.[9] The star has 2.6[7] times the Sun's mass and nearly double the radius of theSun.[8] It is radiating 37[1] times the luminosity of the Sun from itsphotosphere at aneffective temperature of10,504 K,[8] giving it the blue-white hue of aB-type star.[14]

In 1983, this was catalogued as aspectroscopic binary star system with components classed B9V and B9.5V.[5] However, a 2012 survey by R. Chini et al found the star to have a constantradial velocity.[12] There is a companion star at anangular separation of 5.7 arcseconds that shares acommon proper motion with the primary. It is anA-type main-sequence star with a visual magnitude of 9.5.[5] This system is among the 100 strongeststellar X-ray sources within 163 light-years (50 parsecs) of the Sun. It is emitting an X-ray luminosity of1.2×1030 erg·s−1. The source for this X-ray emission is unknown.[15]

References

[edit]
  1. ^abcdAnderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation",Astronomy Letters,38 (5): 331,arXiv:1108.4971,Bibcode:2012AstL...38..331A,doi:10.1134/S1063773712050015,S2CID 119257644.
  2. ^abcdeVallenari, A.; et al. (Gaia collaboration) (2023)."Gaia Data Release 3. Summary of the content and survey properties".Astronomy and Astrophysics.674: A1.arXiv:2208.00211.Bibcode:2023A&A...674A...1G.doi:10.1051/0004-6361/202243940.S2CID 244398875. Gaia DR3 record for this source atVizieR.
  3. ^abcdNicolet, 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.
  4. ^abHouk, Nancy (1978),Michigan catalogue of two-dimensional spectral types for the HD stars, vol. 4, Ann Arbor: Dept. of Astronomy, University of Michigan,Bibcode:1988mcts.book.....H.
  5. ^abcGahm, G. F.; et al. (1983), "A study of visual double stars with early type primaries. I. Spectroscopic results",Astronomy and Astrophysics Supplement Series,51: 143,Bibcode:1983A&AS...51..143G.
  6. ^Gontcharov, G. A. (2006), "Pulkovo Compilation of Radial Velocities for 35495 Hipparcos stars in a common system",Astronomy Letters,32 (11):759–771,arXiv:1606.08053,Bibcode:2006AstL...32..759G,doi:10.1134/S1063773706110065,S2CID 119231169.
  7. ^abcdGullikson, Kevin; et al. (2016), "The Close Companion Mass-ratio Distribution of Intermediate-mass Stars",The Astronomical Journal,152 (2): 40,arXiv:1604.06456,Bibcode:2016AJ....152...40G,doi:10.3847/0004-6256/152/2/40,S2CID 119179065.
  8. ^abcdeFitzpatrick, E. L.; Massa, D. (March 2005), "Determining the Physical Properties of the B Stars. II. Calibration of Synthetic Photometry",The Astronomical Journal,129 (3):1642–1662,arXiv:astro-ph/0412542,Bibcode:2005AJ....129.1642F,doi:10.1086/427855,S2CID 119512018.
  9. ^abGünther, Maximilian N.; et al. (January 20, 2020), "Stellar Flares from the First TESS Data Release: Exploring a New Sample of M Dwarfs",The Astronomical Journal,159 (2): 60,arXiv:1901.00443,Bibcode:2020AJ....159...60G,doi:10.3847/1538-3881/ab5d3a,ISSN 0004-6256.
  10. ^abRoyer, F.; et al. (February 2007), "Rotational velocities of A-type stars. III. Velocity distributions",Astronomy and Astrophysics,463 (2):671–682,arXiv:astro-ph/0610785,Bibcode:2007A&A...463..671R,doi:10.1051/0004-6361:20065224,S2CID 18475298.
  11. ^"105 Aqr".SIMBAD.Centre de données astronomiques de Strasbourg. Retrieved2008-05-16.
  12. ^abChini, R.; et al. (2012), "A spectroscopic survey on the multiplicity of high-mass stars",Monthly Notices of the Royal Astronomical Society,424 (3): 1925,arXiv:1205.5238,Bibcode:2012MNRAS.424.1925C,doi:10.1111/j.1365-2966.2012.21317.x,S2CID 119120749.
  13. ^Johnson, H. L.; Morgan, W. W. (May 1953), "Fundamental stellar photometry for standards of spectral type on the Revised System of the Yerkes Spectral Atlas",Astrophysical Journal,117: 313,Bibcode:1953ApJ...117..313J,doi:10.1086/145697.
  14. ^"The Colour of Stars",Australia Telescope, Outreach and Education,Commonwealth Scientific and Industrial Research Organisation, December 21, 2004, archived fromthe original on March 18, 2012, retrieved2012-01-16.
  15. ^Makarov, Valeri V. (October 2003), "The 100 Brightest X-Ray Stars within 50 Parsecs of the Sun",The Astronomical Journal,126 (4):1996–2008,Bibcode:2003AJ....126.1996M,doi:10.1086/378164.

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