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HD 34557

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HD 34557
Observation data
Epoch J2000      Equinox J2000
Constellation Auriga
Right ascension 05h 20m 14.66904s[1]
Declination +41° 05′ 10.3522″[1]
Apparent magnitude (V) 5.52[2] (5.58 + 8.55)[3]
Characteristics
Spectral type A3V[4]
U−B color index +0.04[2]
B−V color 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 a double star in the northern constellation of Auriga. The fainter star has an angular separation of 0.380″ from the primary component.[3] They have a combined apparent magnitude of 5.52,[2] making HD 34557 faintly visible to the naked eye from dark skies. Based upon parallax measurements made with the Hipparcos satellite, this system is roughly 280 light years away.[1] The primary component is spinning rapidly, with a projected rotational velocity of 217 km/s.[7] It has a stellar classification of A3V,[4] making it an A-type main sequence star.

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 Deutschman, 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. ^ a b Eggleton, 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{{citation}}: CS1 maint: unflagged free DOI (link)
  4. ^ a b Cowley, 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. ^ a b Royer, 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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