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Psi2 Draconis

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(Redirected from 34 Draconis) Star in the constellation Draco For other stars with this Bayer designation, see ψ Draconis.
Psi Draconis
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Draco
Right ascension 17 55 11.15296
Declination +72° 00′ 18.4470″
Apparent magnitude (V) 5.45
Characteristics
Spectral type F2 III+ or F3 II-III
U−B color index +0.15
B−V color index +0.30
Astrometry
Radial velocity (Rv)−2.0 km/s
Proper motion (μ) RA: +8.545 mas/yr
Dec.: −2.133 mas/yr
Parallax (π)3.4888 ± 0.0832 mas
Distance930 ± 20 ly
(287 ± 7 pc)
Absolute magnitude (MV)−2.12±0.14
Details
Mass2.02 M☉
Radius14.70+0.64
−0.34 R☉
Luminosity448±13 L☉
Surface gravity (log g)2.32 cgs
Temperature6925+83
−152 K
Metallicity −1.29 dex
Rotational velocity (v sin i)50 km/s
Age800 Myr
Other designations
ψ Dra, 34 Dra, BD+72° 818, FK5 3429, HD 164613, HIP 87728, HR 6725, SAO 8961
Database references
SIMBADdata

Psi Draconis is a solitary giant star in the northern circumpolar constellation of Draco, also designated 34 Draconis. It lies just over a degree east of the brighter Psi Draconis. Psi Draconis has a yellow-white hue and is dimly visible to the naked eye with an apparent visual magnitude of 5.45. It is located at a distance of 940 light-years (287 parsecs) from the Sun based on parallax, but is drifting closer with a radial velocity of −2 km/s.

According to R. O. Gray and associates (2001), the stellar classification of Psi Draconis is F2III+; a star that has used up its core hydrogen, cooled, and expanded away from the main sequence. A. P. Cowley and W. P. Bidelman (1979) found a similar class of F3 II-III, with the comment that the spectrum showed "many weak lines". Based on the abundance of iron, the metallicity of this star is much lower than in the Sun. It is about 800 million years old and is spinning with a projected rotational velocity of 50 km/s. The star has double the mass of the Sun but has expanded to 15 times the Sun's radius. It is radiating 448 times the luminosity of the Sun from its enlarged photosphere at an effective temperature of 6,925 K.

References

  1. ^ 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.
  2. ^ Oja, T. (April 1983), "UBV photometry of FK4 and FK4 supplement stars", Astronomy and Astrophysics Supplement Series, 52: 1311–34, Bibcode:1983A&AS...52..131O.
  3. ^ Gray, R. O.; et al. (April 2001), "The Physical Basis of Luminosity Classification in the Late A-, F-, and Early G-Type Stars. I. Precise Spectral Types for 372 Stars", The Astronomical Journal, 121 (4): 2148–2158, Bibcode:2001AJ....121.2148G, doi:10.1086/319956.
  4. ^ Cowley, A. P.; Bidelman, W. P. (February 1979), "MK spectral types for some F and G stars", Publications of the Astronomical Society of the Pacific, 91: 83–86, Bibcode:1979PASP...91...83C, doi:10.1086/130446.
  5. ^ Casagrande, L.; et al. (2011), "New constraints on the chemical evolution of the solar neighbourhood and Galactic disc(s). Improved astrophysical parameters for the Geneva-Copenhagen Survey", Astronomy & Astrophysics, 530 (A138): 21, arXiv:1103.4651, Bibcode:2011A&A...530A.138C, doi:10.1051/0004-6361/201016276, S2CID 56118016.
  6. Holmberg, J.; et al. (July 2009), "The Geneva-Copenhagen survey of the solar neighbourhood. III. Improved distances, ages, and kinematics", Astronomy and Astrophysics, 501 (3): 941–947, arXiv:0811.3982, Bibcode:2009A&A...501..941H, doi:10.1051/0004-6361/200811191, S2CID 118577511.
  7. ^ Danziger, I. J.; Faber, S. M. (May 1972), "Rotation of evolving A and F stars", Astronomy and Astrophysics, 18: 428, Bibcode:1972A&A....18..428D.
  8. "psi02 Dra -- Star", SIMBAD Astronomical Database, Centre de Données astronomiques de Strasbourg, retrieved 2017-05-29.
  9. Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869–879, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x, S2CID 14878976.
  10. Sinnott, Roger W.; Perryman, Michael A. C. (1997), Millennium Star Atlas, vol. 3, Sky Publishing Corporation and the European Space Agency, p. 1054, ISBN 0-933346-84-0.


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