HD 16004

HD 16004 is blue-white hued star in the northern constellation of Andromeda. It is a challenge to see with the naked eye even under good viewing conditions, having an apparent visual magnitude of 6.26.[2] Located approximately 660 light-years (202 parsecs) away from the Sun based on parallax, it is drifting closer with a heliocentric radial velocity of −7 km/s.[3]

HD 16004
Observation data
Epoch J2000      Equinox J2000
Constellation Andromeda
Right ascension  02h 35m 27.90126s[1]
Declination +39° 39′ 51.7705″[1]
Apparent magnitude (V) 6.26[2]
Characteristics
Spectral type B9.5 III HgMn[2]
U−B color index −0.33[2]
B−V color index −0.30[2]
Astrometry
Radial velocity (Rv)−6.8±1.1[3] km/s
Proper motion (μ) RA: +16.659[1] mas/yr
Dec.: −34.296[1] mas/yr
Parallax (π)4.9384 ± 0.1650[1] mas
Distance660 ± 20 ly
(202 ± 7 pc)
Absolute magnitude (MV)−0.36[4]
Details
Mass2.88[5] M☉
Radius3.274[6] R☉
Luminosity158[6] L☉
Surface gravity (log g)3.8[5] cgs
Temperature10,809[5] K
Metallicity [Fe/H]−0.17[5] dex
Rotational velocity (v sin i)30[7] km/s
Age162[8] Myr
Other designations
BD+39°573, GC 3093, HD 16004, HIP 12057, HR 746, SAO 55680, WDS J02355+3940A[9]
Database references
SIMBADdata

This is a chemically peculiar Hg-Mn star[10] with a stellar classification of B9.5 III HgMn.[2] It is an estimated 162 million years old and is spinning with a projected rotational velocity of 30 km/s.[7] The star is radiating 158 times the luminosity of the Sun from its photosphere at an effective temperature of 10,809 K.

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. Jaschek, M.; et al. (1980). "The absolute magnitude of the Hg-Mn stars". Astronomy and Astrophysics. 81: 142. Bibcode:1980A&A....81..142J.
  3. Gontcharov, G. A. (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.
  4. Westin, T. N. G. (1985). "The local system of early type stars - Spatial extent and kinematics". Astronomy and Astrophysics Supplement Series. 60: 99–134. Bibcode:1985A&AS...60...99W.
  5. Photo-astrometric distances, extinctions, and astrophysical parameters for Gaia DR2 stars brighter than G = 18. Astronomy and Astrophysics. 2019;628:A94. doi:10.1051/0004-6361/201935765. Bibcode: 2019A&A...628A..94A.
  6. McDonald, I.; et al. (2017). "Fundamental parameters and infrared excesses of Hipparcos stars". Monthly Notices of the Royal Astronomical Society. 471 (1): 770–791. arXiv:1706.02208. Bibcode:2017MNRAS.471..770M. doi:10.1093/mnras/stx1433.
  7. Abt, Helmut A.; et al. (2002). "Rotational Velocities of B Stars". The Astrophysical Journal. 573 (1): 359–365. Bibcode:2002ApJ...573..359A. doi:10.1086/340590.
  8. Gontcharov, G. A. (2012). "Dependence of kinematics on the age of stars in the solar neighborhood". Astronomy Letters. 38 (12): 771. arXiv:1606.08814. Bibcode:2012AstL...38..771G. doi:10.1134/S1063773712120031.
  9. "HD 16004". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2020-07-07.
  10. Renson, P.; Manfroid, J. (2009). "Catalogue of Ap, HgMn and Am stars". Astronomy and Astrophysics. 498 (3): 961. Bibcode:2009A&A...498..961R. doi:10.1051/0004-6361/200810788.
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