111 Herculis

111 Herculis
Observation data; Epoch J2000 Equinox J2000
Constellation	Hercules
Right ascension	18h 47m 01.23246s
Declination	+21° 46′ 53.4381″
Apparent magnitude (V)	4.34
Characteristics
Spectral type	A5III
B−V color index	0.148±0.003
Astrometry
Radial velocity (Rv)	−44.6±2.7 km/s
Proper motion (μ)	RA: +100.536 mas/yr ; Dec.: +116.333 mas/yr
Parallax (π)	35.3525 ± 0.2680 mas
Distance	92.3 ± 0.7 ly ; (28.3 ± 0.2 pc)
Absolute magnitude (MV)	2.04
Details
Mass	2.40 M☉
Radius	1.6 R☉
Luminosity	12.84 L☉
Surface gravity (log g)	4.35 cgs
Temperature	8,873±302 K
Metallicity [Fe/H]	0.33 dex
Rotational velocity (v sin i)	71 km/s
Age	559 Myr
Other designations
	111 Her, BD+18°3823, FK5 1491, HD 173880, HIP 92161, HR 7069, SAO 104093, WDS J18470+1811
Database references
SIMBAD	data

111 Herculis is a suspected astrometric binary^[8] star system located 92 light years from the Sun in the northern constellation Hercules. It is visible to the naked eye as a faint, white-hued point of light with an apparent visual magnitude of 4.34.^[2] The system is moving nearer to the Earth with a heliocentric radial velocity of −45 km/s, and may come as close as 37 light-years in 537,000 years.^[2]

According to Cowley et al. (1969), the visible component has a stellar classification of A5III,^[3] matching an A-type giant star. Abt and Morrell (1995) listed it as type A3IV, suggesting it is instead a less evolved subgiant star.^[9] The interferometry-measured angular diameter of the primary component is 0.52±0.02 mas,^[10] which, at its estimated distance, equates to a physical radius of roughly 1.6 times the radius of the Sun.^[5] The star is estimated to be 559^[4] million years old with 2.40^[4] times the mass of the Sun and is spinning with a projected rotational velocity of 71 km/s.^[4] It is radiating 13 times the Sun's luminosity from its photosphere at an effective temperature of 8,873 K.^[4]

References

^ ^a ^b ^c ^d ^e 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.
^ ^a ^b ^c ^d ^e ^f ^g 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.
^ ^a ^b Cowley, A.; et al. (April 1969), "A study of the bright A stars. I. A catalogue of spectral classifications", Astronomical Journal, 74: 375–406, Bibcode:1969AJ.....74..375C, doi:10.1086/110819
^ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ David, Trevor J.; Hillenbrand, Lynne A. (2015), "The Ages of Early-Type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets", The Astrophysical Journal, 804 (2): 146, arXiv:1501.03154, Bibcode:2015ApJ...804..146D, doi:10.1088/0004-637X/804/2/146, S2CID 33401607.
^ ^a ^b Lang, Kenneth R. (2006), Astrophysical formulae, Astronomy and astrophysics library, vol. 1 (3rd ed.), Birkhäuser, ISBN 3-540-29692-1. The radius (R_*) is given by:
${\begin{aligned}2\cdot R_{*}&={\frac {(10^{-3}\cdot 28.3\cdot 0.52)\ {\text{AU}}}{0.0046491\ {\text{AU}}/R_{\bigodot }}}\\&\approx 3.2\cdot R_{\bigodot }\end{aligned}}$
^ Erspamer, D.; North, P. (February 2003), "Automated spectroscopic abundances of A and F-type stars using echelle spectrographs. II. Abundances of 140 A-F stars from ELODIE", Astronomy and Astrophysics, 398 (3): 1121–1135, arXiv:astro-ph/0210065, Bibcode:2003A&A...398.1121E, doi:10.1051/0004-6361:20021711, S2CID 1109164.
^ "111 Her". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-06-18.
^ 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.
^ Abt, Helmut A.; Morrell, Nidia I. (1995), "The Relation between Rotational Velocities and Spectral Peculiarities among A-Type Stars", Astrophysical Journal Supplement, 99: 135, Bibcode:1995ApJS...99..135A, doi:10.1086/192182.
^ Richichi, A.; Percheron, I.; Khristoforova, M. (February 2005), "CHARM2: An updated Catalog of High Angular Resolution Measurements", Astronomy and Astrophysics, 431 (2): 773–777, Bibcode:2005A&A...431..773R, doi:10.1051/0004-6361:20042039

[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. Gaia DR2 record for this source at VizieR.

[Anderson2012-2] ^ ^a ^b ^c ^d ^e ^f ^g 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.

[Cowley1969-3] Cowley, A.; et al. (April 1969), "A study of the bright A stars. I. A catalogue of spectral classifications", Astronomical Journal, 74: 375–406, Bibcode:1969AJ.....74..375C, doi:10.1086/110819

[David2015-4] ^ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ David, Trevor J.; Hillenbrand, Lynne A. (2015), "The Ages of Early-Type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets", The Astrophysical Journal, 804 (2): 146, arXiv:1501.03154, Bibcode:2015ApJ...804..146D, doi:10.1088/0004-637X/804/2/146, S2CID 33401607.

[lang2006-5] Lang, Kenneth R. (2006), Astrophysical formulae, Astronomy and astrophysics library, vol. 1 (3rd ed.), Birkhäuser, ISBN 3-540-29692-1. The radius (R_*) is given by:
${\begin{aligned}2\cdot R_{*}&={\frac {(10^{-3}\cdot 28.3\cdot 0.52)\ {\text{AU}}}{0.0046491\ {\text{AU}}/R_{\bigodot }}}\\&\approx 3.2\cdot R_{\bigodot }\end{aligned}}$

[Erspamer2003-6] Erspamer, D.; North, P. (February 2003), "Automated spectroscopic abundances of A and F-type stars using echelle spectrographs. II. Abundances of 140 A-F stars from ELODIE", Astronomy and Astrophysics, 398 (3): 1121–1135, arXiv:astro-ph/0210065, Bibcode:2003A&A...398.1121E, doi:10.1051/0004-6361:20021711, S2CID 1109164.

[SIMBAD-7] "111 Her". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-06-18.

[Eggleton2008-8] 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.

[abt1995-9] Abt, Helmut A.; Morrell, Nidia I. (1995), "The Relation between Rotational Velocities and Spectral Peculiarities among A-Type Stars", Astrophysical Journal Supplement, 99: 135, Bibcode:1995ApJS...99..135A, doi:10.1086/192182.

[Richichi2005-10] Richichi, A.; Percheron, I.; Khristoforova, M. (February 2005), "CHARM2: An updated Catalog of High Angular Resolution Measurements", Astronomy and Astrophysics, 431 (2): 773–777, Bibcode:2005A&A...431..773R, doi:10.1051/0004-6361:20042039

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Observation data Epoch J2000 Equinox J2000
Constellation	Hercules
Right ascension	18^h 47^m 01.23246^s^[1]
Declination	+21° 46′ 53.4381″^[1]
Apparent magnitude (V)	4.34^[2]
Characteristics
Spectral type	A5III^[3]
B−V color index	0.148±0.003^[2]
Astrometry

Radial velocity (R_v)	−44.6±2.7^[2] km/s
Proper motion (μ)	RA: +100.536^[1] mas/yr Dec.: +116.333^[1] mas/yr
Parallax (π)	35.3525 ± 0.2680 mas^[1]
Distance	92.3 ± 0.7 ly (28.3 ± 0.2 pc)
Absolute magnitude (M_V)	2.04^[2]

Details

Mass	2.40^[4] `M`_☉
Radius	1.6^[5] `R`_☉
Luminosity	12.84^[2] `L`_☉
Surface gravity (log g)	4.35^[4] cgs
Temperature	8,873±302^[4] K
Metallicity [Fe/H]	0.33^[6] dex
Rotational velocity (v sin i)	71^[4] km/s
Age	559^[4] Myr

Other designations
111 Her, BD+18°3823, FK5 1491, HD 173880, HIP 92161, HR 7069, SAO 104093, WDS J18470+1811^[7]
Database references
SIMBAD	data