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]
| 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 mas[1] |
| Distance | 660 ± 20 ly (202 ± 7 pc) |
| Absolute magnitude (MV) | −0.36[4] |
| Details | |
| Mass | 2.88[5] M☉ |
| Radius | 3.274[6] R☉ |
| Luminosity | 158[6] L☉ |
| Surface gravity (log g) | 3.8[5] cgs |
| Temperature | 10,809[5] K |
| Metallicity [Fe/H] | −0.17[5] dex |
| Rotational velocity (v sin i) | 30[7] km/s |
| Age | 162[8] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
This is a chemically peculiar mercury-manganese 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
edit- ^ a b c d e 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.
- ^ a b c d e f Jaschek, M.; et al. (1980). "The absolute magnitude of the Hg-Mn stars". Astronomy and Astrophysics. 81: 142. Bibcode:1980A&A....81..142J.
- ^ a b 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. S2CID 119231169.
- ^ 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.
- ^ a b c d Anders, F.; Khalatyan, A.; Chiappini, C.; Queiroz, A. B.; Santiago, B. X.; Jordi, C.; Girardi, L.; Brown, A. G. A.; Matijevič, G.; Monari, G.; Cantat-Gaudin, T.; Weiler, M.; Khan, S.; Miglio, A.; Carrillo, I.; Romero-Gómez, M.; Minchev, I.; De Jong, R. S.; Antoja, T.; Ramos, P.; Steinmetz, M.; Enke, H. (2019). "Photo-astrometric distances, extinctions, and astrophysical parameters for Gaia DR2 stars brighter than G = 18". Astronomy and Astrophysics. 628: A94. arXiv:1904.11302. Bibcode:2019A&A...628A..94A. doi:10.1051/0004-6361/201935765. S2CID 131780028.
- ^ a b 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. S2CID 73594365.
- ^ a b 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.
- ^ Gontcharov, G. A. (2012). "Dependence of kinematics on the age of stars in the solar neighborhood". Astronomy Letters. 38 (12): 771–782. arXiv:1606.08814. Bibcode:2012AstL...38..771G. doi:10.1134/S1063773712120031. S2CID 118345778.
- ^ "HD 16004". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2020-07-07.
- ^ 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.