Astronomy:10 Draconis
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| 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[2] mas |
| Distance | 400 ± 10 ly (122 ± 4 pc) |
| Absolute magnitude (MV) | −0.70[5] |
| Details[6] | |
| Mass | 0.93±0.06 M☉ |
| Radius | 83.22+2.08 −2.16 R☉ |
| Luminosity | 1,031±70 L☉ |
| Surface gravity (log g) | 1.00 cgs |
| Temperature | 3,584±35 K |
| Metallicity [Fe/H] | −0.24 dex |
| Age | 10.24±1.40 Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
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]
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
- ↑ "Hipparcos Tools Interactive Data Access". ESA. https://www.cosmos.esa.int/web/hipparcos/interactive-data-access.
- ↑ 2.0 2.1 2.2 2.3 2.4 2.5 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.
- ↑ 3.0 3.1 3.2 "GCVS Query=CU Dra". General Catalogue of Variable Stars @ Sternberg Astronomical Institute, Moscow, Russia. http://www.sai.msu.su/gcvs/cgi-bin/search.cgi?search=CU+Dra.
- ↑ 4.0 4.1 Keenan, Philip C.; McNeil, Raymond C. (1989). "The Perkins catalog of revised MK types for the cooler stars". Astrophysical Journal Supplement Series 71: 245. doi:10.1086/191373. Bibcode: 1989ApJS...71..245K.
- ↑ 5.0 5.1 5.2 5.3 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A.
- ↑ 6.0 6.1 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. doi:10.3847/1538-3881/aa9d8b. Bibcode: 2018AJ....155...30B.
- ↑ "HD 40409". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+40409.
- ↑ 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.
- ↑ Wagman, M. (August 1987). "Flamsteed's Missing Stars". Journal for the History of Astronomy 18 (3): 223. doi:10.1177/002182868701800305. Bibcode: 1987JHA....18..209W.
- ↑ 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. doi:10.1046/j.1365-8711.2002.05150.x. Bibcode: 2002MNRAS.331...45K.
- ↑ Brown, Jeffery A. et al. (June 1990). "S stars without technetium - The binary star connection". Astronomical Journal 99: 1930–1940. doi:10.1086/115475. Bibcode: 1990AJ.....99.1930B.
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