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HD 34557

From Wikipedia, the free encyclopedia
Double star in the constellation Auriga
HD 34557
Observation data
Epoch J2000      Equinox J2000
ConstellationAuriga
Right ascension05h 20m 14.66904s[1]
Declination+41° 05′ 10.3522″[1]
Apparent magnitude (V)5.52[2](5.58 + 8.55)[3]
Characteristics
Spectral typeA3V[4]
U−Bcolor index+0.04[2]
B−Vcolor index+0.11[2]
Astrometry
Radial velocity (Rv)22±4.2[5] km/s
Proper motion (μ)RA: −18.97[1]mas/yr
Dec.: −53.43[1]mas/yr
Parallax (π)11.77±0.58 mas[1]
Distance280 ± 10 ly
(85 ± 4 pc)
Details
Radius1.6[6] R
Rotational velocity (v sin i)217[7] km/s
Other designations
BD+40° 1253,HD 34557,HIP 24902,HR 1738,SAO 40248.
Database references
SIMBADdata

HD 34557 is adouble star in the northernconstellation ofAuriga. The fainter star has anangular separation of 0.380 from the primary component.[3] They have a combinedapparent magnitude of 5.52,[2] making HD 34557 faintly visible to the naked eye from dark skies. Based uponparallax measurements made with theHipparcos satellite, this system is roughly 280 light years away.[1] The primary component is spinning rapidly, with aprojected rotational velocity of 217 km/s.[7] It has astellar classification of A3V,[4] making it anA-type main sequence star.

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. ^abcdDeutschman, W. A.; Davis, R. J.; Schild, R. E. (February 1976), "The galactic distribution of interstellar absorption as determined from the Celescope catalog of ultraviolet stellar observations and a new catalog of UBV, H-beta photoelectric observations",Astrophysical Journal Supplement Series,30:97–225,Bibcode:1976ApJS...30...97D,doi:10.1086/190359
  3. ^abEggleton, P. P.; et al. (2008), "A catalogue of multiplicity among bright stellar systems",Monthly Notices of the Royal Astronomical Society,389 (2):869–879,arXiv:0806.2878,Bibcode:2008MNRAS.389..869E,doi:10.1111/j.1365-2966.2008.13596.x,S2CID 14878976
  4. ^abCowley, A.; et al. (April 1969), "A study of the bright A stars. I. A catalogue of spectral classifications",Astronomical Journal,74:375–406,Bibcode:1969AJ.....74..375C,doi:10.1086/110819
  5. ^Gontcharov, G. A. (November 2006). "Pulkovo Compilation of Radial Velocities for 35 495 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.
  6. ^Pasinetti Fracassini, L. E.; et al. (2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS) - Third edition - Comments and statistics",Astronomy & Astrophysics,367 (2):521–24,arXiv:astro-ph/0012289,Bibcode:2001A&A...367..521P,doi:10.1051/0004-6361:20000451,S2CID 425754
  7. ^abRoyer, F.; et al. (February 2007), "Rotational velocities of A-type stars. III. Velocity distributions",Astronomy and Astrophysics,463 (2):671–682,arXiv:astro-ph/0610785,Bibcode:2007A&A...463..671R,doi:10.1051/0004-6361:20065224,S2CID 18475298

References

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