7 Boötis

7 Boötis
Observation data; Epoch J2000 Equinox J2000
Constellation	Bootes
Right ascension	13h 53m 12.93033s[1]
Declination	+17° 55′ 58.3282″[1]
Apparent magnitude (V)	5.71[2]
Characteristics
Evolutionary stage	Hertzsprung gap[2]
Spectral type	G5 III[2]
B−V color index	0.845[3]
Astrometry
Radial velocity (Rv)	−11.00±0.18[1] km/s
Proper motion (μ)	RA: −34.842[1] mas/yr ; Dec.: +5.092[1] mas/yr
Parallax (π)	5.5236 ± 0.0776[1] mas
Distance	590 ± 8 ly ; (181 ± 3 pc)
Details[2]
Mass	4.0±0.7 M☉
Radius	19.0 R☉
Luminosity	229 L☉
Temperature	4,600 K
Metallicity [Fe/H]	+0.08 dex
Rotational velocity (v sin i)	14.5 km/s
Other designations
	7 Boo, BD+18°2795, HD 121107, HIP 67787, HR 5225, SAO 100751[4]
Database references
SIMBAD	data

7 Boötis is a single[5] star in the northern constellation of Boötes,[4] located 590 light years away from the Sun.[1] It is barely visible to the naked eye as a dim, yellow-hued star with an apparent visual magnitude of 5.71.[2] 7 Boötis is moving closer to the Earth with a heliocentric radial velocity of −11 km/s.[1]

This is an evolved giant star with a stellar classification of G5 III, currently at the end of the Hertzsprung gap. It has a weak level of magnetic activity but a fairly strong X-ray luminosity of 3.72×10²⁰ erg s⁻¹. The rotation rate is moderate, with a projected rotational velocity of 14.5 km/s. It has four times the mass of the Sun and has expanded to 19 times the Sun's radius. The star is radiating 229 times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,600 K.[2]

References

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.
Aurière, M.; et al. (February 2015), "The magnetic fields at the surface of active single G-K giants", Astronomy & Astrophysics, 574: 30, arXiv:1411.6230, Bibcode:2015A&A...574A..90A, doi:10.1051/0004-6361/201424579, A90.
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.
"7 Boo". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved September 13, 2018.
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.

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[GaiaDR2-1] 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.

[Auriere2015-2] Aurière, M.; et al. (February 2015), "The magnetic fields at the surface of active single G-K giants", Astronomy & Astrophysics, 574: 30, arXiv:1411.6230, Bibcode:2015A&A...574A..90A, doi:10.1051/0004-6361/201424579, A90.

[Anderson2012-3] 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.

[SIMBAD-4] "7 Boo". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved September 13, 2018.

[Eggleton2008-5] 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.