HD 35520

HD 35520 is a single[6] star in the northern constellation of Auriga. It has a white hue and is dimly visible to the naked eye with an apparent visual magnitude of 5.92.[2] The distance to this star is approximately 2,200 light years based on parallax.[1] The radial velocity for the star is, as yet, poorly constrained.[2]

HD 35520
Observation data
Epoch J2000      Equinox J2000
Constellation Auriga
Right ascension  05h 26m 48.80400s[1]
Declination +34° 23′ 30.5024″[1]
Apparent magnitude (V) 5.92[2]
Characteristics
Spectral type A1 III[3] or A1p[4]
B−V color index 0.138±0.004[2]
Astrometry
Radial velocity (Rv)+8.3±10.0[2] km/s
Proper motion (μ) RA: +1.716[1] mas/yr
Dec.: −7.380[1] mas/yr
Parallax (π)1.4550 ± 0.0919[1] mas
Distance2,200 ± 100 ly
(690 ± 40 pc)
Details
Radius23.05+0.68
−0.41[1] R☉
Luminosity1,635±126[1] L☉
Temperature7,645+246
−110[1] K
Rotational velocity (v sin i)80[3] km/s
Other designations
BD+34°1040, GC 6689, HD 35520, HIP 25471, HR 1795, SAO 58028[5]
Database references
SIMBADdata

This is an aging chemically peculiar star, or Ap star, in the giant stage of its evolution, with a stellar classifications of A1 III[3] and A1p.[4] The spectrum displays abundance anomalies of helium and silicon.[7] It has been classed as a shell star[8] and has a relatively high projected rotational velocity for its class of 80 km/s.[3] The star has expanded to 23[1] times the radius of the Sun and it is radiating 1,635[1] times the Sun's luminosity from its enlarged photosphere at an effective temperature of 7,645 K.[1]

References
  1. 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.
  2. 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.
  3. Abt, Helmut A.; Morrell, Nidia I. (1995). "The Relation between Rotational Velocities and Spectral Peculiarities among A-Type Stars". Astrophysical Journal Supplement. 99: 135. Bibcode:1995ApJS...99..135A. doi:10.1086/192182.
  4. 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. "HD 35520". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-12-16.
  6. Eggleton, P. P.; Tokovinin, A. A. (September 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.
  7. Renson, P.; Manfroid, J. (May 2009). "Catalogue of Ap, HgMn and Am stars". Astronomy and Astrophysics. 498 (3): 961–966. Bibcode:2009A&A...498..961R. doi:10.1051/0004-6361/200810788.
  8. Jaschek, C.; Jaschek, M.; Andrillat, Y.; Egret, D. (December 1991). "Anomalous infrared emitters among A-type stars". Astronomy and Astrophysics. 252: 229. Bibcode:1991A&A...252..229J.
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