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Omega Geminorum

February 07, 2023

Omega Geminorum, Latinized from ω Geminorum, is a star located in the middle of the northern zodiac constellation of Gemini. With an apparent visual magnitude of 5.18,[2] it is faintly visible to the naked eye. According to the Bortle scale, it can be viewed from dark suburban skies. With an annual parallax shift of just 2.19 mas,[1] it is located about 1,500 light years from the Sun.

ω Geminorum
Location of ω Geminorum (circled)
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Gemini
Right ascension 07h 02m 24.78033s[1]
Declination +24° 12′ 55.6051″[1]
Apparent magnitude (V) 5.18[2]
Characteristics
Spectral type G5 II[3]
U−B color index +0.68[2]
B−V color index +0.95[2]
Variable type Cepheid?[4]
Astrometry
Radial velocity (Rv)−9.10±0.40[5] km/s
Proper motion (μ) RA: −6.74[1] mas/yr
Dec.: -0.25[1] mas/yr
Parallax (π)2.19 ± 0.26 mas[1]
Distanceapprox. 1,500 ly
(approx. 460 pc)
Absolute magnitude (MV)−3.06[6]
Details
Mass6.3±0.5[3] M☉
Radius72[7] R☉
Luminosity1,813[8] L☉
Surface gravity (log g)2.45[9] cgs
Temperature5,090[9] K
Metallicity [Fe/H]−0.02[9] dex
Rotational velocity (v sin i)10[10] km/s
Age14.8[3] Myr
Other designations
ω Gem, 42 Geminorum, BD+24° 1502, FK5 1182, HD 52497, HIP 33927, HR 2630, SAO 78999.[11]
Database references
SIMBADdata

This is an evolved bright giant star with a stellar classification of G5 II.[3] It is positioned near the instability strip and in 1977 was listed as a candidate cepheid variable star[12] with a luminosity amplitude of 0.086 and a period of 0.7282 days.[4] The interferometer-measured angular diameter of this star is 1.47±0.21 mas.[13] At its estimated distance, this yields a physical size of about 72 times the radius of the Sun.[7] It has 6.3[3] times the mass of the Sun and radiates 1,813[8] times the solar luminosity from its outer atmosphere at an effective temperature of 5,090 K.[9]

References

  1. ^ a b c d e f van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357, S2CID 18759600.
  2. ^ a b c d Argue, A. N. (1966), "UBV photometry of 550 F, G and K type stars", Monthly Notices of the Royal Astronomical Society, 133 (4): 475–493, Bibcode:1966MNRAS.133..475A, doi:10.1093/mnras/133.4.475.
  3. ^ a b c d e Tetzlaff, N.; et al. (January 2011), "A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun", Monthly Notices of the Royal Astronomical Society, 410 (1): 190–200, arXiv:1007.4883, Bibcode:2011MNRAS.410..190T, doi:10.1111/j.1365-2966.2010.17434.x, S2CID 118629873.
  4. ^ a b Henriksson, G. (January 1977), "Low amplitude variable stars", Astronomy and Astrophysics, 54: 309–310, Bibcode:1977A&A....54..309H.
  5. ^ de Bruijne, J. H. J.; Eilers, A.-C. (October 2012), "Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project", Astronomy & Astrophysics, 546: 14, arXiv:1208.3048, Bibcode:2012A&A...546A..61D, doi:10.1051/0004-6361/201219219, S2CID 59451347, A61.
  6. ^ 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.
  7. ^ a b Lang, Kenneth R. (2006), Astrophysical formulae, Astronomy and astrophysics library, vol. 1 (3rd ed.), Birkhäuser, ISBN 3-540-29692-1. The radius (R*) is given by:
     
  8. ^ a b McDonald, I.; et al. (2012), "Fundamental Parameters and Infrared Excesses of Hipparcos Stars", Monthly Notices of the Royal Astronomical Society, 427 (1): 343–57, arXiv:1208.2037, Bibcode:2012MNRAS.427..343M, doi:10.1111/j.1365-2966.2012.21873.x, S2CID 118665352.
  9. ^ a b c d Kovtyukh, V. V.; et al. (September 2008), "Reddenings of FGK supergiants and classical Cepheids from spectroscopic data", Monthly Notices of the Royal Astronomical Society, 389 (3): 1336–1344, arXiv:0807.2057, Bibcode:2008MNRAS.389.1336K, doi:10.1111/j.1365-2966.2008.13644.x, S2CID 119204089.
  10. ^ Bernacca, P. L.; Perinotto, M. (1970), "A catalogue of stellar rotational velocities", Contributi Osservatorio Astronomico di Padova in Asiago, 239 (1), Bibcode:1970CoAsi.239....1B.
  11. ^ "ome Gem -- Cepheid variable Star", SIMBAD Astronomical Database, Centre de Données astronomiques de Strasbourg, retrieved 2016-12-09.
  12. ^ Gorynya, N. A.; et al. (November 1998), "A catalog of Cepheid radial velocities measured in 1995-1998 with the correlation spectrometer", Astronomy Letters, 24 (6): 815–818, Bibcode:1998AstL...24..815G.
  13. ^ Richichi, A.; et al. (February 2005), "CHARM2: An updated Catalog of High Angular Resolution Measurements", Astronomy and Astrophysics, 431 (2): 773–777, Bibcode:2005A&A...431..773R, doi:10.1051/0004-6361:20042039

External links

  • Kaler, James B., "Omega Geminorum", Stars, University of Illinois, retrieved 2016-12-10.

February 07, 2023
omega, geminorum, latinized, from, geminorum, star, located, middle, northern, zodiac, constellation, gemini, with, apparent, visual, magnitude, faintly, visible, naked, according, bortle, scale, viewed, from, dark, suburban, skies, with, annual, parallax, shi. Omega Geminorum Latinized from w Geminorum is a star located in the middle of the northern zodiac constellation of Gemini With an apparent visual magnitude of 5 18 2 it is faintly visible to the naked eye According to the Bortle scale it can be viewed from dark suburban skies With an annual parallax shift of just 2 19 mas 1 it is located about 1 500 light years from the Sun w GeminorumLocation of w Geminorum circled Observation dataEpoch J2000 0 Equinox J2000 0 ICRS Constellation GeminiRight ascension 07h 02m 24 78033s 1 Declination 24 12 55 6051 1 Apparent magnitude V 5 18 2 CharacteristicsSpectral type G5 II 3 U B color index 0 68 2 B V color index 0 95 2 Variable type Cepheid 4 AstrometryRadial velocity Rv 9 10 0 40 5 km sProper motion m RA 6 74 1 mas yr Dec 0 25 1 mas yrParallax p 2 19 0 26 mas 1 Distanceapprox 1 500 ly approx 460 pc Absolute magnitude MV 3 06 6 DetailsMass6 3 0 5 3 M Radius72 7 R Luminosity1 813 8 L Surface gravity log g 2 45 9 cgsTemperature5 090 9 KMetallicity Fe H 0 02 9 dexRotational velocity v sin i 10 10 km sAge14 8 3 MyrOther designationsw Gem 42 Geminorum BD 24 1502 FK5 1182 HD 52497 HIP 33927 HR 2630 SAO 78999 11 Database referencesSIMBADdataThis is an evolved bright giant star with a stellar classification of G5 II 3 It is positioned near the instability strip and in 1977 was listed as a candidate cepheid variable star 12 with a luminosity amplitude of 0 086 and a period of 0 7282 days 4 The interferometer measured angular diameter of this star is 1 47 0 21 mas 13 At its estimated distance this yields a physical size of about 72 times the radius of the Sun 7 It has 6 3 3 times the mass of the Sun and radiates 1 813 8 times the solar luminosity from its outer atmosphere at an effective temperature of 5 090 K 9 References Edit a b c d e f van Leeuwen F 2007 Validation of the new Hipparcos reduction Astronomy and Astrophysics 474 2 653 664 arXiv 0708 1752 Bibcode 2007A amp A 474 653V doi 10 1051 0004 6361 20078357 S2CID 18759600 a b c d Argue A N 1966 UBV photometry of 550 F G and K type stars Monthly Notices of the Royal Astronomical Society 133 4 475 493 Bibcode 1966MNRAS 133 475A doi 10 1093 mnras 133 4 475 a b c d e Tetzlaff N et al January 2011 A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun Monthly Notices of the Royal Astronomical Society 410 1 190 200 arXiv 1007 4883 Bibcode 2011MNRAS 410 190T doi 10 1111 j 1365 2966 2010 17434 x S2CID 118629873 a b Henriksson G January 1977 Low amplitude variable stars Astronomy and Astrophysics 54 309 310 Bibcode 1977A amp A 54 309H de Bruijne J H J Eilers A C October 2012 Radial velocities for the HIPPARCOS Gaia Hundred Thousand Proper Motion project Astronomy amp Astrophysics 546 14 arXiv 1208 3048 Bibcode 2012A amp A 546A 61D doi 10 1051 0004 6361 201219219 S2CID 59451347 A61 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 a b Lang Kenneth R 2006 Astrophysical formulae Astronomy and astrophysics library vol 1 3rd ed Birkhauser ISBN 3 540 29692 1 The radius R is given by 2 R 457 1 47 10 3 AU 0 0046491 AU R 144 R displaystyle begin aligned 2 cdot R amp frac 457 cdot 1 47 cdot 10 3 text AU 0 0046491 text AU R bigodot amp approx 144 cdot R bigodot end aligned a b McDonald I et al 2012 Fundamental Parameters and Infrared Excesses of Hipparcos Stars Monthly Notices of the Royal Astronomical Society 427 1 343 57 arXiv 1208 2037 Bibcode 2012MNRAS 427 343M doi 10 1111 j 1365 2966 2012 21873 x S2CID 118665352 a b c d Kovtyukh V V et al September 2008 Reddenings of FGK supergiants and classical Cepheids from spectroscopic data Monthly Notices of the Royal Astronomical Society 389 3 1336 1344 arXiv 0807 2057 Bibcode 2008MNRAS 389 1336K doi 10 1111 j 1365 2966 2008 13644 x S2CID 119204089 Bernacca P L Perinotto M 1970 A catalogue of stellar rotational velocities Contributi Osservatorio Astronomico di Padova in Asiago 239 1 Bibcode 1970CoAsi 239 1B ome Gem Cepheid variable Star SIMBAD Astronomical Database Centre de Donnees astronomiques de Strasbourg retrieved 2016 12 09 Gorynya N A et al November 1998 A catalog of Cepheid radial velocities measured in 1995 1998 with the correlation spectrometer Astronomy Letters 24 6 815 818 Bibcode 1998AstL 24 815G Richichi A et al February 2005 CHARM2 An updated Catalog of High Angular Resolution Measurements Astronomy and Astrophysics 431 2 773 777 Bibcode 2005A amp A 431 773R doi 10 1051 0004 6361 20042039External links EditKaler James B Omega Geminorum Stars University of Illinois retrieved 2016 12 10 Retrieved from https en wikipedia org w index php title Omega Geminorum amp oldid 1124775026, wikipedia, wiki, book, books, library,

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