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HD 165590 is a quintuple system dominated by the binary Algol variable star known as V772 Herculis. The system lies in the constellation of Hercules about 123±6 light years from the Sun, and is suspected to be a part of the Pleiades moving group.[5]

HD 165590

A light curve for V772 Herculis, plotted from TESS data[1]
Observation data
Epoch J2000      Equinox J2000
Constellation Hercules
Right ascension 18h 05m 49.681s
Declination +21° 26′ 45.38″
Apparent magnitude (V) 6.94
Characteristics
HD 165590A
Evolutionary stage main sequence
Spectral type G1V+K6V [2]
Apparent magnitude (g) 7.28[3]
HD 165590B
Evolutionary stage main sequence
Spectral type G5V[2]
Astrometry
ADS 11060AB
Proper motion (μ) RA: −3.9±0.5 mas/yr[4]
Dec.: −51.4±0.7 mas/yr[4]
Parallax (π)26.51 ± 1.35 mas[5]
Distance123 ± 6 ly
(38 ± 2 pc)
ADS 11060C
Proper motion (μ) RA: −27.515±0.014 mas/yr
Dec.: −39.93±0.02 mas/yr
Parallax (π)24.6940 ± 0.0225 mas[6]
Distance132.1 ± 0.1 ly
(40.50 ± 0.04 pc)
Details[2]
HD 165590A
Mass1.09±0.19 + 0.63±0.15 M☉
Radius0.90 + 0.58 R☉
Surface gravity (log g)4.56 + 4.71 cgs
Temperature5,915+4,055 K
Metallicity [Fe/H]−0.13 dex
Age100 Myr
HD 165590B
Radius0.91±0.09 R☉
Temperature5,590±300 K
Age100 Myr
Other designations
ADS 11060, CSI+21 3302 1, GSC 01566-00747, HIP 88637, 2MASS J18054972+2126453, BD+21 3302, SBC9 1024, V772 Her, Gaia DR2 4576326312901654272
HD 165590A: TYC 1566-747-1, SBC9 1023, CSI+21 3302 6, ADS 11060A
HD 165590B: TYC 1566-747-2, CSI+21 3302 7, ADS 11060B
Database references
SIMBADdata

System


The primary star is an eclipsing binary ADS 11060A composed of G1 and K6 young main-sequence stars with strong starspot activity.[2] A radio flare from the star V772 Her was detected in 2011.[7] The period of the components of the primary, ADS 11060Aa and ADS 11060Ab, is 0.87950 days.[5]

A main-sequence companion star ADS 11060B of spectral type G5 at a separation of 0.491 arcseconds,[8] is orbiting the primary with a period of 20.08 years.[5]

Also, there is a suspected companion binary star ADS 11060C (Gaia EDR3 4576326312901650560)[6] at a projected separation of 29 arcseconds (1200 AU) from ADS 11060AB. ADS 11060C is composed of K7 and M0 main-sequence stars, orbiting each other with a period of 25.7631 days without eclipses. The binary is a BY Draconis variable.[9]

The planetary orbits in the habitable zones in the system ADS 11060AB are unstable due to the gravitational influence of the stellar companions.[10]


References


  1. "MAST: Barbara A. Mikulski Archive for Space Telescopes". Space Telescope Science Institute. Retrieved 8 December 2021.
  2. Reglero, V.; Fernandez-Figuerora, M. J.; Gimenez, A.; De Castro, E.; Fabregat, J.; Cornide, M.; Armentia, J. E. (1991). "The triple system HD 165590 : a spectroscopic and photometric study". Astronomy and Astrophysics Supplement Series. 88: 545. Bibcode:1991A&AS...88..545R.
  3. Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. (Erratum: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
  4. "HD 165590". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2022-02-01.
  5. Zasche, P.; Wolf, M.; Hartkopf, W. I.; Svoboda, P.; Uhlař, R.; Liakos, A.; Gazeas, K. (2009). "A Catalog of Visual Double and Multiple Stars with Eclipsing Components". The Astronomical Journal. 138 (2): 664–679. arXiv:0907.5172. Bibcode:2009AJ....138..664Z. doi:10.1088/0004-6256/138/2/664. S2CID 17089387.
  6. Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. (Erratum: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
  7. Polarization Observation Experiments for Radio Flares of Stars at the 6 cm Band
  8. Tokovinin, A. A.; Ismailov, R. M. (1988). "Interferometric observations of double stars in 1985 and 1986". Astronomy and Astrophysics Supplement Series. 72: 563. Bibcode:1988A&AS...72..563T.
  9. Fekel, Francis C.; Henry, Gregory W.; Hampton, Melissa L.; Fried, Robert; Morton, Mary D. (1994). "Chromospherically Active Stars. XII. ADS 11060 C: A Double Linked K Dwarf Binary in a Quintuple System". The Astronomical Journal. 108: 694. Bibcode:1994AJ....108..694F. doi:10.1086/117106.
  10. Benest, D. (2003). "Planetary orbits in the elliptic restricted problem. V.". Astronomy & Astrophysics. 400 (3): 1103–1111. doi:10.1051/0004-6361:20030114.


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