10 Draconis

10 Draconis is a single[8] star in the northern circumpolar constellation of Draco. It was a latter designation of 87 Ursae Majoris,[9] and is visible to the naked eye with an apparent visual magnitude of about 4.6.[3] The distance to this star, as determined from its annual parallax shift of 8.2 mas,[2] is around 400 light years. It is moving closer with a heliocentric radial velocity of −12 km/s, and is expected to come to within 84 ly in about 8.6 million years.[5]

This article is about i Draconis. It is not to be confused with ι Draconis.
10 Draconis

A light curve for CU Draconis, plotted from Hipparcos data[1]
Observation data
Epoch J2000      Equinox J2000
Constellation Draco
Right ascension 13h 51m 25.90451s[2]
Declination +64° 43′ 23.7510″[2]
Apparent magnitude (V) 4.52 - 4.67[3]
Characteristics
Spectral type M3.5 III[4]
B−V color index 1.572±0.010[5]
Variable type LB:[3]
Astrometry
Radial velocity (Rv)−12.26±0.17[5] km/s
Proper motion (μ) RA: +14.144[2] mas/yr
Dec.: +3.172[2] mas/yr
Parallax (π)8.2082 ± 0.2628 mas[2]
Distance400 ± 10 ly
(122 ± 4 pc)
Absolute magnitude (MV)−0.70[5]
Details[6]
Mass0.93±0.06 M☉
Radius83.22+2.08
−2.16 R☉
Luminosity1,031±70 L☉
Surface gravity (log g)1.00 cgs
Temperature3,584±35 K
Metallicity [Fe/H]−0.24 dex
Age10.24±1.40 Gyr
Other designations
i Dra, 10 Dra, CU Dra, BD+65°963, FK5 511, HD 121130, HIP 67627, HR 5226, SAO 16199[7]
Database references
SIMBADdata

Estimated to be around 10 billion years old, this is an aging red giant star with a stellar classification of M3.5 III.[4] It is a periodic variable with a frequency of 11.98912 cycles per day and an amplitude of 0.0254 in magnitude.[10] The spectrum does not show evidence of s-process enhancement.[11] 10 Dra has 93% of the mass of the Sun but has expanded to about 83 times the Sun's radius. The star is radiating over 1,000 times the Sun's luminosity from its enlarged photosphere at an effective temperature of 3,584 K.[6]

References
  1. "Hipparcos Tools Interactive Data Access". Hipparcos. ESA. Retrieved 8 December 2021.
  2. 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.
  3. "GCVS Query=CU Dra". General Catalogue of Variable Stars @ Sternberg Astronomical Institute, Moscow, Russia. Retrieved 2023-04-19.
  4. Keenan, Philip C.; McNeil, Raymond C. (1989). "The Perkins catalog of revised MK types for the cooler stars". Astrophysical Journal Supplement Series. 71: 245. Bibcode:1989ApJS...71..245K. doi:10.1086/191373.
  5. 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.
  6. Baines, E.; Schmitt, H. R.; Zavala, R. T.; Hutter, D.; van Belle, G. T. (December 2017). "Fundamental Parameters of 87 Stars from the Navy Precision Optical Interferometer". The Astronomical Journal. 155 (1): 30. arXiv:1712.08109. Bibcode:2018AJ....155...30B. doi:10.3847/1538-3881/aa9d8b. S2CID 119427037.
  7. "HD 40409". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-07-16.
  8. 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. S2CID 14878976.
  9. Wagman, M. (August 1987). "Flamsteed's Missing Stars". Journal for the History of Astronomy. 18 (3): 223. Bibcode:1987JHA....18..209W. doi:10.1177/002182868701800305. S2CID 118445625.
  10. Koen, Chris; Eyer, Laurent (March 2002). "New periodic variables from the Hipparcos epoch photometry". Monthly Notices of the Royal Astronomical Society. 331 (1): 45–59. arXiv:astro-ph/0112194. Bibcode:2002MNRAS.331...45K. doi:10.1046/j.1365-8711.2002.05150.x. S2CID 10505995.
  11. Brown, Jeffery A.; et al. (June 1990), "S stars without technetium - The binary star connection", Astronomical Journal, 99: 1930–1940, Bibcode:1990AJ.....99.1930B, doi:10.1086/115475{{citation}}: CS1 maint: multiple names: authors list (link)
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