45 Boötis

45 Boötis is a single^[6][7] star located 63 light years away from the Sun in the northern constellation of Boötes. It has the Bayer designation c Boötis; 45 Boötis is the Flamsteed designation. This body is visible to the naked eye as a faint, yellow-white hued star with an apparent visual magnitude of 4.93.^[2] It has a relatively high proper motion, traversing the celestial sphere at the rate of 0.247″ per year.^[8] The star is moving closer to the Earth with a heliocentric radial velocity of −11 km/s,^[2] and is a stream member of the Ursa Major Moving Group.^[9]

45 Boötis

Observation data Epoch J2000      Equinox J2000
Constellation	Boötes
Right ascension	15h 07m 18.06587s[1]
Declination	+24° 52′ 09.0952″[1]
Apparent magnitude (V)	4.93[2]
Characteristics
Spectral type	F5 V[3]
B−V color index	+0.43[3]
Astrometry
Radial velocity (Rv)	−11.2[2] km/s
Proper motion (μ)	RA: +184.767[1] mas/yr Dec.: −164.012[1] mas/yr
Parallax (π)	51.6674 ± 0.1882 mas[1]
Distance	63.1 ± 0.2 ly (19.35 ± 0.07 pc)
Absolute magnitude (MV)	3.96[4]
Details[2]
Mass	1.21±0.16 M☉
Radius	1.461±0.027 R☉
Luminosity	3.30+0.25 −0.22 L☉
Surface gravity (log g)	4.19 cgs
Temperature	6,435 K
Metallicity [Fe/H]	−0.02 dex
Rotational velocity (v sin i)	39.8 km/s
Age	1.6+0.8 −0.6 Gyr
Other designations
c Boo, 45 Boo, NSV 6945, BD+25°2873, FK5 1396, GJ 578, HD 134083, HIP 73996, HR 5634, SAO 83671, WDS J15073+2452[5]
Database references
SIMBAD	data

This is an F-type main-sequence star with a stellar classification of F5 V.^[3] It is around 1.6 billion years old and is spinning with a projected rotational velocity of 40 km/s. The star has 1.2 times the mass of the Sun and 1.46 times the Sun's radius. It is radiating 3.3 times the luminosity of the Sun from its photosphere at an effective temperature of 6,435 K.^[2] 45 Boötis is a source of X-ray emission.^[10]

There is a magnitude 11.53 visual companion at an angular separation of 103.50″ along a position angle (PA) of 40°, as of 2012. A magnitude 10.23 star can be found at a separation of 247.90″ with a PA of 358°, as of 2015.^[11]

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. Valenti, J. A.; Fischer, D. A. (2005), "Spectroscopic Properties of Cool Stars (SPOCS). I. 1040 F, G, and K Dwarfs from Keck, Lick, and AAT Planet Search Programs", The Astrophysical Journal Supplement Series, 159 (1): 141–166, Bibcode:2005ApJS..159..141V, doi:10.1086/430500.
3. Malagnini, M. L.; Morossi, C. (November 1990), "Accurate absolute luminosities, effective temperatures, radii, masses and surface gravities for a selected sample of field stars", Astronomy and Astrophysics Supplement Series, 85 (3): 1015–1019, Bibcode:1990A&AS...85.1015M
4. Eggen, Olin J. (August 1998), "The Sirius Supercluster and Missing Mass near the Sun", The Astronomical Journal, 116 (2): 782–788, Bibcode:1998AJ....116..782E, doi:10.1086/300465.
5. "40 Boo". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved May 12, 2019.
6. Fuhrmann, K.; et al. (2017), "Multiplicity among Solar-type Stars", The Astrophysical Journal, 836 (1): 139, Bibcode:2017ApJ...836..139F, doi:10.3847/1538-4357/836/1/139.
7. 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.
8. Lépine, Sébastien; Shara, Michael M. (March 2005), "A Catalog of Northern Stars with Annual Proper Motions Larger than 0.15" (LSPM-NORTH Catalog)", The Astronomical Journal, 129 (3): 1483–1522, arXiv:astro-ph/0412070, Bibcode:2005AJ....129.1483L, doi:10.1086/427854, S2CID 2603568.
9. King, Jeremy R.; et al. (2003), "Stellar Kinematic Groups. II. A Reexamination of the Membership, Activity, and Age of the Ursa Major Group", The Astronomical Journal, 125 (4): 1980, Bibcode:2003AJ....125.1980K, doi:10.1086/368241.
10. Haakonsen, Christian Bernt; Rutledge, Robert E. (September 2009), "XID II: Statistical Cross-Association of ROSAT Bright Source Catalog X-ray Sources with 2MASS Point Source Catalog Near-Infrared Sources", The Astrophysical Journal Supplement, 184 (1): 138–151, arXiv:0910.3229, Bibcode:2009ApJS..184..138H, doi:10.1088/0067-0049/184/1/138, S2CID 119267456.
11. Mason, B. D.; et al. (2014), "The Washington Visual Double Star Catalog", The Astronomical Journal, 122 (6): 3466, Bibcode:2001AJ....122.3466M, doi:10.1086/323920.

External links

• HR 5634
• CCDM J15074+2453
• Image 45 Boötis