HD 1606

HD 1606 is a single[12] star in the northern constellation of Andromeda, positioned a few degrees to the northeast of the bright star Alpheratz. It has a blue-white hue and is dimly visible to the naked eye with an apparent visual magnitude of 5.87.[2] Although it is suspected of variability, none has been conclusively found.[13] The star is located at a distance of approximately 580 light-years (179 parsecs) from the Sun based on parallax,[1] and is drifting further away with a radial velocity of +4 km/s.[7] It has an absolute magnitude of −0.5.[8]

HD 1606
Observation data
Epoch J2000      Equinox J2000
Constellation Andromeda
Right ascension  00h 20m 24.40107s[1]
Declination +30° 56′ 08.2099″[1]
Apparent magnitude (V) 5.869[2]
Characteristics
Evolutionary stage main sequence[3]
Spectral type B7V[4]
U−B color index −0.45[5]
B−V color index −0.10[5]
Variable type Suspected[6]
Astrometry
Radial velocity (Rv)3.8[7] km/s
Proper motion (μ) RA: 15.734±0.159[1] mas/yr
Dec.: −2.957±0.125[1] mas/yr
Parallax (π)5.5900 ± 0.1069[1] mas
Distance580 ± 10 ly
(179 ± 3 pc)
Absolute magnitude (MV)−0.5[8]
Details
Mass3.75±0.08[3] M☉
Radius2.9[9] R☉
Luminosity245+36
−31[3] L☉
Surface gravity (log g)3.988±0.017[10] cgs
Temperature13,186±100[10] K
Rotational velocity (v sin i)113±8[10] km/s
Other designations
NSV 128, BD+30°42, GC 408, HD 1606, HIP 1630, HR 78, SAO 53820, PPM 65213[11]
Database references
SIMBADdata

This is a B-type main-sequence star with a stellar classification of B7V,[4] which means it is currently generating energy through hydrogen fusion at its core. It has 3.75[3] times the mass of the Sun and a fairly high rate of spin, showing a projected rotational velocity of 113 km/s.[10] The star is radiating 245[3] times the luminosity of the Sun from its photosphere at an effective temperature of 13,186 K.[10]

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. Høg, E.; et al. (2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355. Bibcode:2000A&A...355L..27H.
  3. Zorec, J.; et al. (2012). "Rotational velocities of A-type stars. IV. Evolution of rotational velocities". Astronomy and Astrophysics. 537: A120. arXiv:1201.2052. Bibcode:2012A&A...537A.120Z. doi:10.1051/0004-6361/201117691.
  4. Cowley, A. (1972). "Spectral classification of the bright B8 stars". The Astronomical Journal. 77: 750. Bibcode:1972AJ.....77..750C. doi:10.1086/111348.
  5. Hamdy, M. A.; et al. (1993). "A catalogue of spectral classification and photometric data of B-type stars". Astrophysics and Space Science. 203: 53–107. Bibcode:1993Ap&SS.203...53H. doi:10.1007/BF00659414.
  6. Samus, N. N.; Durlevich, O. V.; et al. (2009). "General Catalogue of Variable Stars (Samus+ 2007-2013)". VizieR On-line Data Catalog: B/gcvs. Originally Published in: 2009yCat....102025S. 1. Bibcode:2009yCat....102025S.
  7. Wilson, R. E. (1953). "General Catalogue of Stellar Radial Velocities". Carnegie Institute Washington D.C. Publication. Carnegie Institute of Washington D.C. Bibcode:1953GCRV..C......0W.
  8. Eggen, O. J. (1977). "Is star formation bimodal ? II. The nearest early-type stars". Publications of the Astronomical Society of the Pacific. 89: 187. Bibcode:1977PASP...89..187E. doi:10.1086/130099.
  9. Pasinetti Fracassini, L. E.; et al. (2001). "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS)". Astronomy and Astrophysics (Third ed.). 367 (2): 521. arXiv:astro-ph/0012289. Bibcode:2001A&A...367..521P. doi:10.1051/0004-6361:20000451.
  10. Huang, Wenjin; et al. (2010). "A Stellar Rotation Census of B Stars: From Zams to Tams". The Astrophysical Journal. 722: 605–619. arXiv:1008.1761. Bibcode:2010ApJ...722..605H. doi:10.1088/0004-637X/722/1/605.
  11. "HD 1606". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2020-07-06.
  12. Eggleton, P. P.; Tokovinin, A. A. (2008). "A catalogue of multiplicity among bright stellar systems". Monthly Notices of the Royal Astronomical Society. 389 (2): 869. arXiv:0806.2878. Bibcode:2008MNRAS.389..869E. doi:10.1111/j.1365-2966.2008.13596.x.
  13. BSJ (4 January 2010). "NSV 128". AAVSO Website. American Association of Variable Star Observers. Retrieved 21 December 2013.
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