Astronomy:HD 5788 and HD 5789

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Short description: Binary star system in the constellation Andromeda
HD 5789/5788
Observation data
{{#ifeq:J2000|J2000.0 (ICRS)|Epoch J2000.0      Equinox J2000.0 (ICRS)| Epoch J2000      [[Astronomy:Equinox (celestial coordinates)|Equinox J2000}}
Constellation Andromeda
HD 5789
Right ascension  01h 00m 03.55767s[1]
Declination +44° 42′ 47.6898″[1]
Apparent magnitude (V) 6.06[2]
HD 5788
Right ascension  01h 00m 03.38277s[1]
Declination +44° 42′ 40.0515″[1]
Apparent magnitude (V) 6.763[3]
Characteristics
HD 5789
Spectral type B9.5Vnn (λ Boo)[4]
B−V color index −0.031[5]
HD 5788
Spectral type A2 Vn[6]
B−V color index −0.010[5]
Astrometry
Radial velocity (Rv)+4.4±3.3[7] km/s
Proper motion (μ) RA: +13.85[8] mas/yr
Dec.: −23.83[8] mas/yr
Parallax (π)6.6432 ± 0.0809[1] mas
Distance491 ± 6 ly
(151 ± 2 pc)
Proper motion (μ) RA: +11.582[1] mas/yr
Dec.: −24.369[1] mas/yr
Parallax (π)6.5625 ± 0.0688[1] mas
Distance497 ± 5 ly
(152 ± 2 pc)
Details
HD 5789
Mass2.74±0.12[9] M☉
Luminosity85.6+19.2
−15.6[9] L☉
Temperature9,977[5] K
Rotational velocity (v sin i)249[9] km/s
HD 5788
Mass2.67±0.12[9] M☉
Luminosity73.3+18.4
−14.7[9] L☉
Temperature9,840[5] K
Rotational velocity (v sin i)270[9] km/s
Other designations
HD 5788: HR 282, SAO 36832[10]
Database references
HD 5789
SIMBADdata
HD 5788
SIMBADdata

HD 5789 and HD 5788 is a pair of stars comprising a binary star[11] system in the northern constellation of Andromeda. Located approximately 151 parsecs (490 ly) away, the primary is a hot, massive blue star with an apparent magnitude of 6.06 while the secondary is slightly smaller and cooler, with an apparent magnitude of 6.76. Both stars are main-sequence stars, meaning that they are currently fusing hydrogen into helium in their cores. As of 2016, the pair had an angular separation of 7.90″ along a position angle of 195°.[12] While both have a similar proper motion and parallax, there's still no proof that the pair is gravitationally bound.

The primary component is HD 5789, a B-type main-sequence star with a stellar classification of B9.5Vnn (λ Boo), where the 'n' indicates "nebulous" lines due to rapid rotation. Abt and Morrell (1995) listed it as a Lambda Boötis star,[4] although this is disputed.[13] It has 2.7 times the mass of the Sun and is spinning rapidly with a projected rotational velocity of 249 km/s.[9] The star is radiating 86[9] times the Sun's luminosity from its photosphere at an effective temperature of 9,977 K.[5]

The fainter secondary component is an A-type main-sequence star with a class of A2 Vn.[6] It shows a projected rotational velocity of 270 km/s and has 2.7 times the Sun's mass. The star shines with 73[9] times the Sun's luminosity at an effective temperature of 9,840 K.[5]

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G. 
  2. ↑ Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters 38 (5): 331, doi:10.1134/S1063773712050015, Bibcode: 2012AstL...38..331A. 
  3. ↑ Høg, E. et al. (2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics 355: L27. doi:10.1888/0333750888/2862. Bibcode: 2000A&A...355L..27H. 
  4. ↑ 4.0 4.1 Abt, Helmut A.; Morrell, Nidia I. (July 1995), "The Relation between Rotational Velocities and Spectral Peculiarities among A-Type Stars", Astrophysical Journal Supplement 99: 135, doi:10.1086/192182, Bibcode: 1995ApJS...99..135A. 
  5. ↑ 5.0 5.1 5.2 5.3 5.4 5.5 Soubiran, Caroline et al. (2016). "The PASTEL catalogue: 2016 version". Astronomy & Astrophysics 591: A118. doi:10.1051/0004-6361/201628497. Bibcode: 2016A&A...591A.118S. 
  6. ↑ 6.0 6.1 Cowley, A. et al. (April 1969). "A study of the bright A stars. I. A catalogue of spectral classifications". Astronomical Journal 74: 375–406. doi:10.1086/110819. Bibcode: 1969AJ.....74..375C. 
  7. ↑ Gontcharov, G. A. (November 2006), "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system", Astronomy Letters 32 (11): 759–771, doi:10.1134/S1063773706110065, Bibcode: 2006AstL...32..759G. 
  8. ↑ 8.0 8.1 van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics 474 (2): 653–664. doi:10.1051/0004-6361:20078357. Bibcode: 2007A&A...474..653V. 
  9. ↑ 9.0 9.1 9.2 9.3 9.4 9.5 9.6 9.7 9.8 Zorec, J.; Royer, F. (2012). "Rotational velocities of A-type stars. IV. Evolution of rotational velocities". Astronomy & Astrophysics 537: A120. doi:10.1051/0004-6361/201117691. Bibcode: 2012A&A...537A.120Z. 
  10. ↑ "HD 5788". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+5788. 
  11. ↑ 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. doi:10.1111/j.1365-2966.2008.13596.x. Bibcode: 2008MNRAS.389..869E. 
  12. ↑ Mason, B. D. et al. (2014), "The Washington Visual Double Star Catalog", The Astronomical Journal 122 (6): 3466, doi:10.1086/323920, Bibcode: 2001AJ....122.3466M 
  13. ↑ Murphy, Simon J. et al. (October 2015), "An Evaluation of the Membership Probability of 212 λ Boo Stars. I. A Catalogue", Publications of the Astronomical Society of Australia 32: 43, doi:10.1017/pasa.2015.34, e036, Bibcode: 2015PASA...32...36M. 
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