HR 4138

Last updated
HR 4138
Observation data
Epoch J2000        Equinox J2000
Constellation Carina
Right ascension 10h 30m 20.12710s [1]
Declination −71° 59′ 34.0602″ [1]
Apparent magnitude  (V)+4.72 [2]
Characteristics
Spectral type A2IV [3] [4] or A1V [5] or A2III [6]
B−V color index +0.042±0.007 [2]
Astrometry
Radial velocity (Rv)+7.5±0.4 [2]  km/s
Proper motion (μ)RA: +27.59 [1]   mas/yr
Dec.: −30.73 [1]   mas/yr
Parallax (π)12.52 ± 0.17  mas [1]
Distance 261 ± 4  ly
(80 ± 1  pc)
Absolute magnitude  (MV)0.21 [2]
Details
Mass 2.10 [7]   M☉
Radius 3.45 [8]   R☉
Luminosity 75.06 [2]   L☉
Surface gravity (log g)3.71 [7]   cgs
Temperature 9,169±312 [7]   K
Metallicity [Fe/H]+0.06 [2]   dex
Rotational velocity (v sin i)12 [7]  km/s
Age 403 [7]   Myr
Other designations
K Car, CD−71°1034, FK5  2842, GC  14457, HD  91375, HIP  51438, HR  4138, SAO  256722 [9]
Database references
SIMBAD data

HR 4138 is a single [10] star in the constellation Carina. It has the Bayer designation K Carinae, [11] abbreviated K Car, while HR 4138 is the star's designation in the Bright Star Catalogue . It has a white hue and is faintly visible to the naked eye with an apparent visual magnitude of +4.72. [2] This star is located at a distance of approximately 261  light years from the Sun based on parallax measurements, [1] and it is drifting further away with a radial velocity of +7.5 km/s. [2] Judging from its motion through space, it is a candidate member of the Sirius supercluster. [12]

This object is a superficially normal [4] A-type star. However, there is some disagreement over the evolutionary state of the star, as it has received luminosity classifications of a subgiant, [4] main sequence, [5] and a giant star. [6] Unexpectedly for an A-type star, a magnetic field has been detected. [4] It is around 400 million years old and has a low projected rotational velocity of 12 km/s. [7] The star displays an infrared excess, [10] indicating the presence of an orbiting debris disk with a black body temperature of 45 K at a separation of 314.2  AU from the host star. [8]

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References

  1. 1 2 3 4 5 6 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. 1 2 3 4 5 6 7 8 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.
  3. ↑ Gray, R. O.; Garrison, R. F. (1987), "The Early A-Type Stars: Refined MK Classification, Confrontation with Stroemgren Photometry, and the Effects of Rotation", The Astrophysical Journal Supplement Series, 65: 581, Bibcode:1987ApJS...65..581G, doi: 10.1086/191237 .
  4. 1 2 3 4 Mathys, G.; Hubrig, S. (July 2006), "The diagnosis of the mean quadratic magnetic field of Ap stars", Astronomy and Astrophysics, 453 (2): 699–715, Bibcode:2006A&A...453..699M, doi: 10.1051/0004-6361:20054353 .
  5. 1 2 Houk, Nancy (1978), Michigan catalogue of two-dimensional spectral types for the HD stars, vol. 1, Ann Arbor: Dept. of Astronomy, University of Michigan, Bibcode:1975mcts.book.....H.
  6. 1 2 Levato, O. H. (August 1972), "Rotational Velocities and Spectral Types of Some A-Type Stars", Publications of the Astronomical Society of the Pacific, 84 (500): 584, Bibcode:1972PASP...84..584L, doi: 10.1086/129336 .
  7. 1 2 3 4 5 6 David, Trevor J.; Hillenbrand, Lynne A. (2015), "The Ages of Early-Type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets", The Astrophysical Journal, 804 (2): 146, arXiv: 1501.03154 , Bibcode:2015ApJ...804..146D, doi:10.1088/0004-637X/804/2/146, S2CID   33401607.
  8. 1 2 Cotten, Tara H.; Song, Inseok (July 2016), "A Comprehensive Census of Nearby Infrared Excess Stars", The Astrophysical Journal Supplement Series, 225 (1): 24, arXiv: 1606.01134 , Bibcode:2016ApJS..225...15C, doi:10.3847/0067-0049/225/1/15, S2CID   118438871, 15.
  9. ↑ "HD 91375". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 2019-12-06.
  10. 1 2 Rodriguez, David R.; Zuckerman, B. (February 2012), "Binaries among Debris Disk Stars", The Astrophysical Journal, 745 (2): 147, arXiv: 1111.5618 , Bibcode:2012ApJ...745..147R, doi:10.1088/0004-637X/745/2/147, S2CID   73681879.
  11. ↑ Kostjuk, N. D. (2004), "VizieR Online Data Catalog: HD-DM-GC-HR-HIP-Bayer-Flamsteed Cross Index (Kostjuk, 2002)", VizieR On-line Data Catalog: IV/27A. Originally Published in: Institute of Astronomy of Russian Academy of Sciences (2002), 4027, Bibcode:2004yCat.4027....0K.
  12. ↑ Palous, J.; Hauck, B. (July 1986), "The Sirius supercluster", Astronomy and Astrophysics, 162: 54–61, Bibcode:1986A&A...162...54P.
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