39 Draconis

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39 Draconis
Observation data
Epoch J2000        Equinox J2000
Constellation Draco [1]
A
Right ascension 18h 23m 54.60689s [2]
Declination +58° 48′ 02.6667″ [2]
Apparent magnitude  (V)5.06 [3]
B
Right ascension 18h 23m 54.51639s [4]
Declination +58° 48′ 06.3674″ [4]
Apparent magnitude  (V)8.07 [3]
Characteristics
Evolutionary stage main sequence [2] [5]
Spectral type A1V + F5V [6]
U−B color index +0.06 [7]
B−V color index +0.10 [7]
Astrometry
Radial velocity (Rv)−24.53±0.23 [8] km/s
A
Proper motion (μ)RA: −37.322 [2] mas/yr
Dec.: +62.892 [2] mas/yr
Parallax (π)17.1615±0.0631  mas [2]
Distance 190.1 ± 0.7  ly
(58.3 ± 0.2  pc)
Absolute magnitude  (MV)+1.31 [9]
B
Proper motion (μ)RA: −41.742 [4] mas/yr
Dec.: +61.076 [4] mas/yr
Parallax (π)17.2293±0.0219  mas [4]
Distance 189.3 ± 0.2  ly
(58.04 ± 0.07  pc)
Absolute magnitude  (MV)+4.32 [9]
Orbit [3]
Period (P)4,000±200  yr
Semi-major axis (a)6.6±0.3″
Eccentricity (e)0.553±0.005
Inclination (i)107.7±0.12°
Longitude of the node (Ω)179.9±0.10°
Periastron epoch (T)5671.40±12.08
Argument of periastron (ω)
(secondary)		128.0±2.2°
Details
39 Dra A
Mass 2.12 [9]   M☉
Radius 2.3 [10]   R☉
Luminosity 27 [10]   L☉
Surface gravity (log g)4.04 [10]   cgs
Temperature 8,630 [10]   K
Rotational velocity (v sin i)186 [5]  km/s
Age 350 [11]   Myr
39 Dra B
Mass 1.18 [9]   M☉
Radius 1.15 [10]   R☉
Luminosity1.85 [10]   L☉
Surface gravity (log g)4.40 [10]   cgs
Temperature 6,271 [10]   K
Rotation 5.9 days [12]
Age 2.6 [13]   Gyr
Other designations
b Dra, 39 Dra, BD+58°1809, HD 170073, HIP 90156, HR 6923, SAO 30949 [14]
Database references
SIMBAD 39 Dra
39 Dra A
39 Dra B

39 Draconis is a wide binary star system in the northern circumpolar constellation of Draco. It has the Bayer designation b Draconis, while 39 Draconis is the Flamsteed designation. This system is visible to the naked eye as a dim, white-hued point of light with a combined apparent visual magnitude of 5.0. [1] Parallax measurements made by the Gaia spacecraft put it at a distance of 190 light-years, or 58 parsecs away from the Sun. The system is moving closer to the Earth with a heliocentric radial velocity of −24.5 km/s. [8]

The two components of 39 Draconis have an angular separation of 6.621″ and take almost 4,000 years to orbit each other. [3] The primary star is an early A-type main-sequence star, having 2.12 times the mass of the Sun with a visual magnitude of 5.06. [3] The secondary is a magnitude 8.07 [3] F-type main-sequence star, and has 1.18 times the mass of the Sun. [9]

The 8th-magnitude star HD 238865 is listed in double star catalogues as component C. [15] It is separated from the other two stars by 90″ and lies at about the same distance. [16] It is itself a spectroscopic binary with an F8 primary and a red dwarf secondary orbiting every 2.7 days. [17] [18]

References

  1. 1 2 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. XHIP record for this object at VizieR.
  2. 1 2 3 4 5 6 Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv: 2208.00211 . Bibcode:2023A&A...674A...1G. doi: 10.1051/0004-6361/202243940 . S2CID   244398875. Gaia DR3 record for this source at VizieR.
  3. 1 2 3 4 5 6 "Sixth Catalog of Orbits of Visual Binary Stars". United States Naval Observatory. Archived from the original on 2017-08-01. Retrieved 2017-06-22.
  4. 1 2 3 4 5 Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv: 2208.00211 . Bibcode:2023A&A...674A...1G. doi: 10.1051/0004-6361/202243940 . S2CID   244398875. Gaia DR3 record for this source at VizieR.
  5. 1 2 Zorec, J.; Royer, F. (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.
  6. ↑ Lutz, T. E.; Lutz, J. H. (1977). "Spectral classification and UBV photometry of bright visual double stars". The Astronomical Journal. 82: 431. Bibcode:1977AJ.....82..431L. doi: 10.1086/112066 .
  7. 1 2 Mermilliod, J.-C. (1986). "Compilation of Eggen's UBV data, transformed to UBV (unpublished)". Catalogue of Eggen's UBV Data. Bibcode:1986EgUBV........0M.
  8. 1 2 Pourbaix, D.; et al. (2004). "SB9: The ninth catalogue of spectroscopic binary orbits". Astronomy and Astrophysics. 424 (2): 727–732. arXiv: astro-ph/0406573 . Bibcode:2004A&A...424..727P. doi:10.1051/0004-6361:20041213. S2CID   119387088.
  9. 1 2 3 4 5 Novakovic, B.; Todorovic, N. (2006). "Orbits of four double stars". Serbian Astronomical Journal. 172 (172): 21. Bibcode:2006SerAJ.172...21N. doi: 10.2298/SAJ0672021N . S2CID   55352155.
  10. 1 2 3 4 5 6 7 8 Stassun, Keivan G.; et al. (2019). "The Revised TESS Input Catalog and Candidate Target List". The Astronomical Journal. 158 (4): 138. arXiv: 1905.10694 . Bibcode:2019AJ....158..138S. doi: 10.3847/1538-3881/ab3467 .
  11. ↑ De Rosa, R. J.; Patience, J.; Wilson, P. A.; Schneider, A.; Wiktorowicz, S. J.; Vigan, A.; Marois, C.; Song, I.; MacIntosh, B.; Graham, J. R.; Doyon, R.; Bessell, M. S.; Thomas, S.; Lai, O. (2014). "The VAST Survey - III. The multiplicity of A-type stars within 75 pc". Monthly Notices of the Royal Astronomical Society. 437 (2): 1216. arXiv: 1311.7141 . Bibcode:2014MNRAS.437.1216D. doi: 10.1093/mnras/stt1932 .
  12. ↑ Lin, Chia-Lung; Apai, Dániel; Giampapa, Mark S.; Ip, Wing-Huen (2024). "Scalable, Advanced Machine Learning Based Approaches for Stellar Flare Identification: Application to TESS Short-cadence Data and Analysis of a New Flare Catalog". The Astronomical Journal. 168 (6): 234. arXiv: 2409.02540 . Bibcode:2024AJ....168..234L. doi: 10.3847/1538-3881/ad7956 .
  13. ↑ Ware, Austin; Young, Patrick; Truitt, Amanda; Spacek, Alexander (2022). "Continuous Habitable Zones: Using Bayesian Methods to Prioritize Characterization of Potentially Habitable Worlds". The Astrophysical Journal. 929 (2): 143. arXiv: 2203.06259 . Bibcode:2022ApJ...929..143W. doi: 10.3847/1538-4357/ac5c4e .
  14. ↑ "* b Dra". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 21 June 2017.
  15. ↑ Mason, B. D.; et al. (2014). "The Washington Visual Double Star Catalog". The Astronomical Journal. 122 (6): 3466–3471. Bibcode:2001AJ....122.3466M. doi: 10.1086/323920 .
  16. ↑ 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 .
  17. ↑ De Rosa, R. J.; Patience, J.; Wilson, P. A.; Schneider, A.; Wiktorowicz, S. J.; Vigan, A.; Marois, C.; Song, I.; MacIntosh, B.; Graham, J. R.; Doyon, R.; Bessell, M. S.; Thomas, S.; Lai, O. (2014). "The VAST Survey - III. The multiplicity of A-type stars within 75 pc". Monthly Notices of the Royal Astronomical Society. 437 (2): 1216. arXiv: 1311.7141 . Bibcode:2014MNRAS.437.1216D. doi: 10.1093/mnras/stt1932 . S2CID   88503488.
  18. ↑ Tokovinin, A. A.; Smekhov, M. G. (1995). "Spectroscopic components in multiple systems: ADS 11336C". Astronomy Letters. 21 (2): 247. Bibcode:1995AstL...21..247T.
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