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HR 4138

From Wikipedia, the free encyclopedia
Star in the constellation Carina
This article is about K Carinae. For k Carinae, seeHD 81101.
HR 4138
Observation data
EpochJ2000      EquinoxJ2000
ConstellationCarina
Right ascension10h 30m 20.12710s[1]
Declination−71° 59′ 34.0602″[1]
Apparent magnitude (V)+4.72[2]
Characteristics
Spectral typeA2IV[3][4] or A1V[5] or A2III[6]
B−Vcolor 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]
Distance261 ± 4 ly
(80 ± 1 pc)
Absolute magnitude (MV)0.21[2]
Details
Mass2.10[7] M☉
Radius3.45[8] R☉
Luminosity75.06[2] L☉
Surface gravity (log g)3.71[7] cgs
Temperature9,169±312[7] K
Metallicity [Fe/H]+0.06[2] dex
Rotational velocity (v sin i)12[7] km/s
Age403[7] Myr
Other designations
K Car,CD−71°1034,FK5 2842,GC 14457,HD 91375,HIP 51438,HR 4138,SAO 256722[9]
Database references
SIMBADdata

HR 4138 is a single[10]star in theconstellationCarina. It has theBayer designationK Carinae,[11] abbreviated K Car, whileHR 4138 is the star's designation in theBright Star Catalogue. It has a white hue and is faintly visible to the naked eye with anapparent visual magnitude of +4.72.[2] This star is located at a distance of approximately 261 light years from theSun based onparallax measurements,[1] and it is drifting further away with aradial velocity of +7.5 km/s.[2] Judging from its motion through space, it is a candidate member of theSirius supercluster.[12]

This object is a superficially normal[4]A-type star. However, there is some disagreement over theevolutionary state of the star, as it has receivedluminosity classifications of asubgiant,[4]main sequence,[5] and agiant star.[6] Unexpectedly for an A-type star, amagnetic field has been detected.[4] It is around 400 million years old and has a lowprojected rotational velocity of 12 km/s.[7] The star displays aninfrared excess,[10] indicating the presence of an orbiting debris disk with ablack body temperature of 45 K at a separation of314.2 AU from the host star.[8]

References

[edit]
  1. ^abcdefvan 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. ^abcdefghAnderson, 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. ^abcdMathys, 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. ^abHouk, 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. ^abLevato, 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. ^abcdefDavid, 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. ^abCotten, 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. Retrieved2019-12-06.
  10. ^abRodriguez, 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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