Star in the constellation Draco
This article is about i Draconis. Not to be confused with ι Draconis .
10 Draconis
light curve for CU Draconis, plotted from Hipparcos
Observation dataEpoch J2000 Equinox J2000
Constellation
Draco
Right ascension
13 51 25.90451
Declination
+64° 43′ 23.7510″
Apparent magnitude (V)
4.52 - 4.67
Characteristics
Spectral type
M3.5 III
B−V color index
1.572±0.010
Variable type
LB:
Astrometry Radial velocity (Rv )−12.26±0.17 km/s Proper motion (μ) RA: +14.144 mas /yr Dec.: +3.172 mas /yr Parallax (π)8.2082 ± 0.2628 mas Distance 400 ± 10 ly pc ) Absolute magnitude (MV )−0.70 Details Mass 0.93±0.06 M ☉ Radius 83.22+2.08R ☉ Luminosity 1,031±70 L ☉ Surface gravity (log g )1.00 cgs Temperature 3,584±35 K Metallicity −0.24 dex Age 10.24±1.40 Gyr Other designations i Dra , 10 Dra , CU Dra , BD +65°963, FK5 511, HD 121130, HIP 67627, HR 5226, SAO 16199 Database references SIMBAD data
10 Draconis is a single star in the northern circumpolar constellation of Draco . It was a latter designation of 87 Ursae Majoris , and is visible to the naked eye with an apparent visual magnitude of about 4.6. The distance to this star, as determined from its annual parallax shift of 8.2 mas , 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.
Estimated to be around 10 billion years old, this is an aging red giant star with a stellar classification of M3.5 III. It is a periodic variable with a frequency of 11.98912 cycles per day and an amplitude of 0.0254 in magnitude. The spectrum does not show evidence of s-process enhancement. 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.
References
"Hipparcos Tools Interactive Data Access" . Hipparcos . ESA. Retrieved 8 December 2021.^ 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 .
^ "GCVS Query=CU Dra" . General Catalogue of Variable Stars @ Sternberg Astronomical Institute, Moscow, Russia . Retrieved 2023-04-19.
^ 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 .
^ 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 .
^ 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 .
"HD 40409" . SIMBAD Centre de données astronomiques de Strasbourg . Retrieved 2018-07-16.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 .
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 .
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 .
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 .
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