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HD 30479
Observation data
Epoch J2000       Equinox J2000
Constellation Mensa
Right ascension 04h 38m 21.7254s [1]
Declination −77° 39′ 21.6185″ [1]
Apparent magnitude (V) 6.04 ± 0.01 [2]
Characteristics
Spectral type K2 III [3]
U−B color index +0.95 [4]
B−V color index +1.10 [4]
Astrometry
Radial velocity (Rv)10.3 ± 0.1 [5] km/s
Proper motion (μ) RA: −6.975 [1]  mas/ yr
Dec.: −11.166 [1]  mas/ yr
Parallax (π)6.0377 ± 0.0223  mas [1]
Distance540 ± 2  ly
(165.6 ± 0.6  pc)
Absolute magnitude (MV)−0.05
Details
Mass1.28 [6]  M☉
Radius17.99 [7]  R☉
Luminosity116 [8]  L☉
Surface gravity (log g)2 [9]  cgs
Temperature4,390 [9]  K
Metallicity [Fe/H]−0.15 [10]  dex
Rotational velocity (v sin i)<1 [11] km/s
Other designations
13 G. Mensae, CPD−77°181, FK5 2350, GC 5750, HD 30479, HIP 21611, HR 1531, SAO 256116
Database references
SIMBAD data

HD 30479 (HR 1531) is a solitary star in the southern circumpolar constellation Mensa. It has an apparent magnitude of 6.04, [2] making it barely visible to the naked eye even under ideal conditions. It is located at a distance of 540 light years [1] but is receding with a heliocentric radial velocity of 10.3  km/s. [5]

HD 30479 has a stellar classification of K2 III, [3] indicating that it is an early K-type giant star and has an angular diameter of 1.01±0.07  mas [9] (after limb darkening correction). This yields a radius 17.99 [7] times that of the Sun at its estimated distance. At present it has 1.28 [6] times the mass of the Sun and radiates at 116 [8] times the luminosity of the Sun at an effective temperature of 4,390 [9] K from its enlarged photosphere, which gives it an orange glow. HD 30479 is believed to be one of the metal-deficient members of the young disk population [10] with an iron abundance of 71% [10] that of the Sun. Currently, it spins leisurely with a projected rotational velocity less than 1  km/s, [11] common for giants.

References

  1. ^ a b c d e f Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv: 2012.01533. Bibcode: 2021A&A...649A...1G. doi: 10.1051/0004-6361/202039657. S2CID  227254300. (Erratum:  doi: 10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
  2. ^ a b Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P.; Wicenec, A. (March 2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27–L30. Bibcode: 2000A&A...355L..27H. ISSN  0004-6361.
  3. ^ a b Houk, N.; Cowley, A. P. (1975). University of Michigan Catalogue of two-dimensional spectral types for the HD stars. Volume I. Declinations -90_ to -53_ƒ0. Bibcode: 1975mcts.book.....H.
  4. ^ a b Johnson, H. L.; Mitchell, R. I.; Iriarte, B.; Wisniewski, W. Z. (1966). "UBVRIJKL Photometry of the Bright Stars". Communications of the Lunar and Planetary Laboratory. 4: 99–110. Bibcode: 1966CoLPL...4...99J.
  5. ^ a b 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.
  6. ^ a b Anders, F.; et al. (1 August 2019). "Photo-astrometric distances, extinctions, and astrophysical parameters for Gaia DR2 stars brighter than G = 18". Astronomy and Astrophysics. 628: A94. arXiv: 1904.11302. Bibcode: 2019A&A...628A..94A. doi: 10.1051/0004-6361/201935765. ISSN  0004-6361. S2CID  131780028.
  7. ^ a b Lang, Kenneth R. (2006). Astrophysical formulae. Astronomy and astrophysics library. Vol. 1 (3 ed.). Birkhäuser. ISBN  3-540-29692-1.. The radius (R*) is given by:
  8. ^ a b McDonald, I.; Zijlstra, A. A.; Watson, R. A. (2017). "Fundamental parameters and infrared excesses of Tycho-Gaia stars". Monthly Notices of the Royal Astronomical Society. 471 (1): 770. arXiv: 1706.02208. Bibcode: 2017MNRAS.471..770M. doi: 10.1093/mnras/stx1433.
  9. ^ a b c d Lafrasse, Sylvain; Mella, Guillaume; Bonneau, Daniel; Duvert, Gilles; Delfosse, Xavier; Chesneau, Olivier; Chelli, Alain (16 July 2010). "Building the 'JMMC Stellar Diameters Catalog' using SearchCal". Optical and Infrared Interferometry II. Vol. 7734. pp. 77344E. arXiv: 1009.0137. Bibcode: 2010SPIE.7734E..4EL. doi: 10.1117/12.857024. S2CID  32097037.
  10. ^ a b c Eggen, O. J. (February 1994). "Evolved GK stars near the Sun. 2: The young disk population". The Astronomical Journal. 107: 594. Bibcode: 1994AJ....107..594E. doi: 10.1086/116879. ISSN  0004-6256.
  11. ^ a b De Medeiros, J. R.; Alves, S.; Udry, S.; Andersen, J.; Nordström, B.; Mayor, M. (January 2014). "A catalog of rotational and radial velocities for evolved stars: V. Southern stars⋆⋆⋆". Astronomy & Astrophysics. 561: A126. arXiv: 1312.3474. Bibcode: 2014A&A...561A.126D. doi: 10.1051/0004-6361/201220762. ISSN  0004-6361.
Retrieved from " https://en.wikipedia.org/?title=HD_30479&oldid=1183280993"
From Wikipedia, the free encyclopedia
HD 30479
Observation data
Epoch J2000       Equinox J2000
Constellation Mensa
Right ascension 04h 38m 21.7254s [1]
Declination −77° 39′ 21.6185″ [1]
Apparent magnitude (V) 6.04 ± 0.01 [2]
Characteristics
Spectral type K2 III [3]
U−B color index +0.95 [4]
B−V color index +1.10 [4]
Astrometry
Radial velocity (Rv)10.3 ± 0.1 [5] km/s
Proper motion (μ) RA: −6.975 [1]  mas/ yr
Dec.: −11.166 [1]  mas/ yr
Parallax (π)6.0377 ± 0.0223  mas [1]
Distance540 ± 2  ly
(165.6 ± 0.6  pc)
Absolute magnitude (MV)−0.05
Details
Mass1.28 [6]  M☉
Radius17.99 [7]  R☉
Luminosity116 [8]  L☉
Surface gravity (log g)2 [9]  cgs
Temperature4,390 [9]  K
Metallicity [Fe/H]−0.15 [10]  dex
Rotational velocity (v sin i)<1 [11] km/s
Other designations
13 G. Mensae, CPD−77°181, FK5 2350, GC 5750, HD 30479, HIP 21611, HR 1531, SAO 256116
Database references
SIMBAD data

HD 30479 (HR 1531) is a solitary star in the southern circumpolar constellation Mensa. It has an apparent magnitude of 6.04, [2] making it barely visible to the naked eye even under ideal conditions. It is located at a distance of 540 light years [1] but is receding with a heliocentric radial velocity of 10.3  km/s. [5]

HD 30479 has a stellar classification of K2 III, [3] indicating that it is an early K-type giant star and has an angular diameter of 1.01±0.07  mas [9] (after limb darkening correction). This yields a radius 17.99 [7] times that of the Sun at its estimated distance. At present it has 1.28 [6] times the mass of the Sun and radiates at 116 [8] times the luminosity of the Sun at an effective temperature of 4,390 [9] K from its enlarged photosphere, which gives it an orange glow. HD 30479 is believed to be one of the metal-deficient members of the young disk population [10] with an iron abundance of 71% [10] that of the Sun. Currently, it spins leisurely with a projected rotational velocity less than 1  km/s, [11] common for giants.

References

  1. ^ a b c d e f Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv: 2012.01533. Bibcode: 2021A&A...649A...1G. doi: 10.1051/0004-6361/202039657. S2CID  227254300. (Erratum:  doi: 10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
  2. ^ a b Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P.; Wicenec, A. (March 2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27–L30. Bibcode: 2000A&A...355L..27H. ISSN  0004-6361.
  3. ^ a b Houk, N.; Cowley, A. P. (1975). University of Michigan Catalogue of two-dimensional spectral types for the HD stars. Volume I. Declinations -90_ to -53_ƒ0. Bibcode: 1975mcts.book.....H.
  4. ^ a b Johnson, H. L.; Mitchell, R. I.; Iriarte, B.; Wisniewski, W. Z. (1966). "UBVRIJKL Photometry of the Bright Stars". Communications of the Lunar and Planetary Laboratory. 4: 99–110. Bibcode: 1966CoLPL...4...99J.
  5. ^ a b 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.
  6. ^ a b Anders, F.; et al. (1 August 2019). "Photo-astrometric distances, extinctions, and astrophysical parameters for Gaia DR2 stars brighter than G = 18". Astronomy and Astrophysics. 628: A94. arXiv: 1904.11302. Bibcode: 2019A&A...628A..94A. doi: 10.1051/0004-6361/201935765. ISSN  0004-6361. S2CID  131780028.
  7. ^ a b Lang, Kenneth R. (2006). Astrophysical formulae. Astronomy and astrophysics library. Vol. 1 (3 ed.). Birkhäuser. ISBN  3-540-29692-1.. The radius (R*) is given by:
  8. ^ a b McDonald, I.; Zijlstra, A. A.; Watson, R. A. (2017). "Fundamental parameters and infrared excesses of Tycho-Gaia stars". Monthly Notices of the Royal Astronomical Society. 471 (1): 770. arXiv: 1706.02208. Bibcode: 2017MNRAS.471..770M. doi: 10.1093/mnras/stx1433.
  9. ^ a b c d Lafrasse, Sylvain; Mella, Guillaume; Bonneau, Daniel; Duvert, Gilles; Delfosse, Xavier; Chesneau, Olivier; Chelli, Alain (16 July 2010). "Building the 'JMMC Stellar Diameters Catalog' using SearchCal". Optical and Infrared Interferometry II. Vol. 7734. pp. 77344E. arXiv: 1009.0137. Bibcode: 2010SPIE.7734E..4EL. doi: 10.1117/12.857024. S2CID  32097037.
  10. ^ a b c Eggen, O. J. (February 1994). "Evolved GK stars near the Sun. 2: The young disk population". The Astronomical Journal. 107: 594. Bibcode: 1994AJ....107..594E. doi: 10.1086/116879. ISSN  0004-6256.
  11. ^ a b De Medeiros, J. R.; Alves, S.; Udry, S.; Andersen, J.; Nordström, B.; Mayor, M. (January 2014). "A catalog of rotational and radial velocities for evolved stars: V. Southern stars⋆⋆⋆". Astronomy & Astrophysics. 561: A126. arXiv: 1312.3474. Bibcode: 2014A&A...561A.126D. doi: 10.1051/0004-6361/201220762. ISSN  0004-6361.
Retrieved from " https://en.wikipedia.org/?title=HD_30479&oldid=1183280993"

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