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Mu2 Gruis

Mu2 Gruis, Latinized from μ2 Gruis, is a yellow-hued star or star system in the southern constellation of Grus. It is a suspected astrometric binary, showing a variation in proper motion due to gravitational acceleration.[7] Mu2 Gruis is visible to the naked eye with an apparent visual magnitude of 5.10.[2] The distance to this system, as determined using an annual parallax shift of 13.2 mas as seen from the Earth,[1] is around 248 light years. It is drifting further away with a heliocentric radial velocity of +12.5 km/s.[4]

Mu2 Gruis
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Grus
Right ascension 22h 16m 26.54790s[1]
Declination −41° 37′ 37.8266″[1]
Apparent magnitude (V) 5.10[2]
Characteristics
Spectral type G8 III[3]
B−V color index +0.92[2]
Astrometry
Radial velocity (Rv)+12.50[4] km/s
Proper motion (μ) RA: −14.788[1] mas/yr
Dec.: −15.530[1] mas/yr
Parallax (π)13.1578 ± 0.1559 mas[1]
Distance248 ± 3 ly
(76.0 ± 0.9 pc)
Absolute magnitude (MV)+0.56[5]
Details
Radius9.97+0.32
−0.20
[1] R
Luminosity56.37±0.78[1] L
Temperature5009+52
−79
[1] K
Other designations
μ2 Gru, CD−42° 15846, HD 211202, HIP 109973, HR 8488, SAO 231063[6]
Database references
SIMBADdata

The primary component is an evolved giant star with a stellar classification of G8 III.[3] It is a periodic variable star, showing a change in brightness with an amplitude of 0.004 magnitude at the rate of 7.50983 times per day.[8] With the supply of hydrogen at its core exhausted, the star has cooled and expanded until now it has 10 times the radius of the Sun. It is radiating 56[1] times the luminosity of the Sun from its swollen photosphere at an effective temperature of 5,009 K.[1]

References Edit

  1. ^ a b c d e f g h i j k Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  2. ^ a b c 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.
  3. ^ a b Houk, N. (1978), Michigan catalogue of two-dimensional spectral types for the HD stars, vol. 2, Dept. of Astronomy, University of Michigan, Bibcode:1978mcts.book.....H.
  4. ^ a b Gontcharov, G. A. (November 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.
  5. ^ Anderson, 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.
  6. ^ "mu.02 Gru -- Star", SIMBAD Astronomical Database, Centre de Données astronomiques de Strasbourg, retrieved 2017-06-26.
  7. ^ Makarov, V. V.; Kaplan, G. H. (May 2005), "Statistical Constraints for Astrometric Binaries with Nonlinear Motion", The Astronomical Journal, 129 (5): 2420–2427, Bibcode:2005AJ....129.2420M, doi:10.1086/429590.
  8. ^ Koen, Chris; Eyer, Laurent (2002), "New periodic variables from the Hipparcos epoch photometry", Monthly Notices of the Royal Astronomical Society, 331 (1): 45–59, arXiv:astro-ph/0112194, Bibcode:2002MNRAS.331...45K, doi:10.1046/j.1365-8711.2002.05150.x, S2CID 10505995.

gruis, other, stars, with, this, bayer, designation, gruis, latinized, from, gruis, yellow, hued, star, star, system, southern, constellation, grus, suspected, astrometric, binary, showing, variation, proper, motion, gravitational, acceleration, visible, naked. For other stars with this Bayer designation see m Gruis Mu2 Gruis Latinized from m2 Gruis is a yellow hued star or star system in the southern constellation of Grus It is a suspected astrometric binary showing a variation in proper motion due to gravitational acceleration 7 Mu2 Gruis is visible to the naked eye with an apparent visual magnitude of 5 10 2 The distance to this system as determined using an annual parallax shift of 13 2 mas as seen from the Earth 1 is around 248 light years It is drifting further away with a heliocentric radial velocity of 12 5 km s 4 Mu2 Gruis Observation dataEpoch J2000 0 Equinox J2000 0 ICRS Constellation GrusRight ascension 22h 16m 26 54790s 1 Declination 41 37 37 8266 1 Apparent magnitude V 5 10 2 CharacteristicsSpectral type G8 III 3 B V color index 0 92 2 AstrometryRadial velocity Rv 12 50 4 km sProper motion m RA 14 788 1 mas yr Dec 15 530 1 mas yrParallax p 13 1578 0 1559 mas 1 Distance248 3 ly 76 0 0 9 pc Absolute magnitude MV 0 56 5 DetailsRadius9 97 0 32 0 20 1 R Luminosity56 37 0 78 1 L Temperature5009 52 79 1 KOther designationsm2 Gru CD 42 15846 HD 211202 HIP 109973 HR 8488 SAO 231063 6 Database referencesSIMBADdataThe primary component is an evolved giant star with a stellar classification of G8 III 3 It is a periodic variable star showing a change in brightness with an amplitude of 0 004 magnitude at the rate of 7 50983 times per day 8 With the supply of hydrogen at its core exhausted the star has cooled and expanded until now it has 10 times the radius of the Sun It is radiating 56 1 times the luminosity of the Sun from its swollen photosphere at an effective temperature of 5 009 K 1 References Edit a b c d e f g h i j k Brown A G A et al Gaia collaboration August 2018 Gaia Data Release 2 Summary of the contents and survey properties Astronomy amp Astrophysics 616 A1 arXiv 1804 09365 Bibcode 2018A amp A 616A 1G doi 10 1051 0004 6361 201833051 Gaia DR2 record for this source at VizieR a b c 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 a b Houk N 1978 Michigan catalogue of two dimensional spectral types for the HD stars vol 2 Dept of Astronomy University of Michigan Bibcode 1978mcts book H a b Gontcharov G A November 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 Anderson 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 mu 02 Gru Star SIMBAD Astronomical Database Centre de Donnees astronomiques de Strasbourg retrieved 2017 06 26 Makarov V V Kaplan G H May 2005 Statistical Constraints for Astrometric Binaries with Nonlinear Motion The Astronomical Journal 129 5 2420 2427 Bibcode 2005AJ 129 2420M doi 10 1086 429590 Koen Chris Eyer Laurent 2002 New periodic variables from the Hipparcos epoch photometry Monthly Notices of the Royal Astronomical Society 331 1 45 59 arXiv astro ph 0112194 Bibcode 2002MNRAS 331 45K doi 10 1046 j 1365 8711 2002 05150 x S2CID 10505995 Retrieved from https en wikipedia org w index php title Mu2 Gruis amp oldid 1141298031, wikipedia, wiki, book, books, library,

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