HD 158633 is a main sequence star in the northern constellation of Draco. With an apparent visual magnitude of 6.43, this star is a challenge to view with the unaided eye but it can be seen clearly with a small telescope. Based upon parallax measurements, it is located at a distance of around 42 light years from the Sun. The star is drifting closer to the Sun with a radial velocity of −39 km/s,[2] and is predicted to come to within 26.5 ly (8.1 pc) in around 190,400 years.[10]

This is a K-type main sequence star with a spectral classification of K0 V. It has about 79% of the Sun's radius and 73% of the solar mass.[5] It is an estimated 4.3 billion years old and is spinning with a projected rotational velocity of 3.4 km/s.[8] The star is emitting an excess of infrared radiation at a wavelength of 70 μm, suggesting the presence of an orbiting debris disk.[7] It has a low metallicity, with only 37% of the Sun's abundance of elements more massive than helium,[7] and has a relatively high proper motion.[1][9]

References

  1. ^ a b c d e f 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. ^ a b c d 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, S2CID 119257644.
  3. ^ a b Hauck, B.; Mermilliod, M. (1998). "uvbyβ photoelectric photometric catalogue". Astronomy and Astrophysics Supplement Series. 129 (3): 431–433. Bibcode:1998A&AS..129..431H. doi:10.1051/aas:1998195.
  4. ^ Kovtyukh, V. V.; et al. (2004). "A new Böhm-Vitense gap in the temperature range 5560 to 5610 K in the main sequence". Astronomy and Astrophysics. 427 (3): 933–936. arXiv:astro-ph/0409753. Bibcode:2004A&A...427..933K. doi:10.1051/0004-6361:20041449. S2CID 204935981.
  5. ^ a b c d e Boyajian, Tabetha S.; et al. (July 2013), "Stellar Diameters and Temperatures. III. Main-sequence A, F, G, and K Stars: Additional High-precision Measurements and Empirical Relations", The Astrophysical Journal, 771 (1): 31, arXiv:1306.2974, Bibcode:2013ApJ...771...40B, doi:10.1088/0004-637X/771/1/40, S2CID 14911430, 40. See Table 3.
  6. ^ Luck, R. Earle; Heiter, Ulrike (2006). "Dwarfs in the Local Region". The Astronomical Journal. 131 (6): 3069–3092. Bibcode:2006AJ....131.3069L. doi:10.1086/504080.
  7. ^ a b c d Beichman, C. A.; et al. (2006). "New Debris Disks Around Nearby Main-Sequence Stars: Impact on the Direct Detection of Planets". The Astrophysical Journal. 652 (2): 1674–1693. arXiv:astro-ph/0611682. Bibcode:2006ApJ...652.1674B. doi:10.1086/508449. S2CID 14207148.
  8. ^ a b Luck, R. Earle (January 2017), "Abundances in the Local Region II: F, G, and K Dwarfs and Subgiants", The Astronomical Journal, 153 (1): 19, arXiv:1611.02897, Bibcode:2017AJ....153...21L, doi:10.3847/1538-3881/153/1/21, S2CID 119511744, 21.
  9. ^ a b "LHS 3287". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2009-04-14.
  10. ^ Bailer-Jones, C. A. L. (January 2018), "The completeness-corrected rate of stellar encounters with the Sun from the first Gaia data release", Astronomy & Astrophysics, 609: 16, arXiv:1708.08595, Bibcode:2018A&A...609A...8B, doi:10.1051/0004-6361/201731453, S2CID 119462489, A8


Allikas: http://en.wikipedia.org/wiki/HD_158633
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