Misplaced Pages

91 Aquarii

Article snapshot taken from Wikipedia with creative commons attribution-sharealike license. Give it a read and then ask your questions in the chat. We can research this topic together.
(Redirected from Psi1 Aquarii) Triple star system in the constellation Aquarius "ψ¹ Aquarii" redirects here. For other stars with this Bayer designation, see ψ Aquarii.

91 Aquarii
Location of ψ Aquarii (circled)
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Aquarius
Right ascension 23 15 53.49405
Declination –09° 05′ 15.8450″
Apparent magnitude (V) +4.248
Characteristics
Spectral type K1 III
U−B color index +1.035
B−V color index +1.104
R−I color index 0.56
Astrometry
Radial velocity (Rv)−26.07±0.13 km/s
Proper motion (μ) RA: +369.477 mas/yr
Dec.: −16.981 mas/yr
Parallax (π)22.0924 ± 0.1302 mas
Distance147.6 ± 0.9 ly
(45.3 ± 0.3 pc)
Absolute magnitude (MV)0.919
Details
Mass0.774±0.150 M☉
1.004±0.175 M☉
1.4±0.1 M☉
1.76±0.21 M☉
Radius10.8±0.2 R☉
Luminosity48±3 L☉
Surface gravity (log g)2.32±0.11 cgs
Temperature4,631±69 K
Metallicity −0.03±0.01 dex
Rotational velocity (v sin i)1.49±0.45 km/s
Age1.54±0.46 Gyr
3.56±0.63 Gyr
9.2±5.1 Gyr
Other designations
Psi Aquarii, ADS 16633, Gl 893.2, WDS J23159-0905
A: BD–09 6156, FK5 1608, HD 219449, HIP 114855, HR 8841, LTT 9437, SAO 146598
BC: BD–09 6155, HD 219430, LTT 9434, SAO 146596
Database references
SIMBADA
BC

91 Aquarii is a triple star system in the equatorial constellation of Aquarius. It also bears the Bayer designation Psi Aquarii (ψ Aqr, ψ Aquarii). It is visible to the naked eye with an apparent visual magnitude of +4.248. Parallax measurements yield an estimated distance of around 150 light-years (46 parsecs) from Earth. An extrasolar planet is known to orbit the main star.

Stellar system

91 Aquarii is a triple star system. The primary component, 91 Aqr A, is a giant star with a stellar classification of K1 III. This is an evolved star that has expanded to over 10 times the size of the Sun's size. Is mass and age are uncertain, mass estimates range from 0.77 M☉ to 1.8 M☉, while age ranges from 1.5 to 9 billion years. It is radiating 48 times the Sun's luminosity from its outer envelope at an effective temperature of 4,630 K. This gives it the orange-hued glow of a K-type star.

The primary shares a common proper motion with two others stars, 91 Aqr B and C, suggesting that they are physically connected. The latter pair form a binary system located at an angular separation of 52 arcseconds from the primary. They are 10th magnitude stars separated by 0.3 arcseconds from each other.

Component Apparent magnitude (V) Spectral type
A 4.22 K0 III
B 9.62 K3 V
C 10.10

Because it lies near the same line of sight, the binary star system CCDM J23159-0905DE was listed to belong to the 91 Aquarii system according to the CCDM catalogue. However, it is listed as physically unconnected in the WDS catalogue and the pair have a different proper motion than 91 Aquarii. CCDM J23159-0905DE has two components, the 13th magnitude CCDM J23159-0905D 80.4 arcseconds from 91 Aquarii, and the 14th magnitude CCDM J23159-0905E 19.7 arcseconds from 91 Aquarii.

Planetary system

In 2003, the discovery of an extrasolar planet orbiting 91 Aquarii A was announced, but its confirmation was not formally published until 2013.

The 91 Aquarii planetary system
Companion
(in order from star) 		Mass Semimajor axis
(AU) 		Orbital period
(days) 		Eccentricity Inclination Radius
b >3.2 MJ 0.70 181.4±0.1 0.027±0.026 — —

See also

References

  1. ^ Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
  2. ^ Jennens, P. A.; Helfer, H. L. (September 1975), "A new photometric metal abundance and luminosity calibration for field G and K giants.", Monthly Notices of the Royal Astronomical Society, 172 (3): 667–679, Bibcode:1975MNRAS.172..667J, doi:10.1093/mnras/172.3.667.
  3. ^ Baines, Ellyn K.; et al. (2018), "Fundamental Parameters of 87 Stars from the Navy Precision Optical Interferometer", The Astronomical Journal, 155 (1), 30, arXiv:1712.08109, Bibcode:2018AJ....155...30B, doi:10.3847/1538-3881/aa9d8b, S2CID 119427037.
  4. VizieR Detailed Page for HR 8841, retrieved November 28, 2009.
  5. Liu, Y. J.; et al. (2007), "The abundances of nearby red clump giants", Monthly Notices of the Royal Astronomical Society, 382 (2): 553–66, Bibcode:2007MNRAS.382..553L, doi:10.1111/j.1365-2966.2007.11852.x.
  6. ^ Soubiran, C.; Creevey, O. L.; Lagarde, N.; Brouillet, N.; Jofré, P.; Casamiquela, L.; Heiter, U.; Aguilera-Gómez, C.; Vitali, S.; Worley, C.; de Brito Silva, D. (February 1, 2024), "Gaia FGK benchmark stars: Fundamental Teff and log g of the third version", Astronomy and Astrophysics, 682: A145, Bibcode:2024A&A...682A.145S, doi:10.1051/0004-6361/202347136, ISSN 0004-6361 91 Aquarii's database entry at VizieR.
  7. ^ Mitchell, David S.; et al. (2013), "Precise radial velocities of giant stars. V. A brown dwarf and a planet orbiting the K giant stars τ Geminorum and 91 Aquarii", Astronomy and Astrophysics, 555, A87, arXiv:1305.5107, Bibcode:2013A&A...555A..87M, doi:10.1051/0004-6361/201321714, S2CID 32245543.
  8. ^ Jofré, E.; Petrucci, R.; Saffe, C.; Saker, L.; Artur de la Villarmois, E.; Chavero, C.; Gómez, M.; Mauas, P. J. D. (February 1, 2015), "Stellar parameters and chemical abundances of 223 evolved stars with and without planets", Astronomy and Astrophysics, 574: A50, Bibcode:2015A&A...574A..50J, doi:10.1051/0004-6361/201424474, ISSN 0004-6361
  9. ^ Silva, J. Gomes da; Santos, N. C.; Adibekyan, V.; Sousa, S. G.; Campante, T. L.; Figueira, P.; Bossini, D.; Delgado-Mena, E.; Monteiro, M. J. P. F. G.; Laverny, P. de; Recio-Blanco, A.; Lovis, C. (February 1, 2021). "Stellar chromospheric activity of 1674 FGK stars from the AMBRE-HARPS sample - I. A catalogue of homogeneous chromospheric activity". Astronomy & Astrophysics. 646: A77. doi:10.1051/0004-6361/202039765. ISSN 0004-6361. 91 Aquarii's database entry at VizieR.
  10. ^ 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.
  11. van Leeuwen, F. (November 2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357, S2CID 18759600.
  12. "The Colour of Stars", Australia Telescope, Outreach and Education, Commonwealth Scientific and Industrial Research Organisation, December 21, 2004, archived from the original on February 22, 2012, retrieved January 16, 2012.
  13. ^ Roell, T.; Neuhäuser, R.; Seifahrt, A.; Mugrauer, M. (June 2012), "Extrasolar planets in stellar multiple systems", Astronomy & Astrophysics, 542: A92, arXiv:1204.4833, Bibcode:2012A&A...542A..92R, doi:10.1051/0004-6361/201118051, S2CID 55755453
  14. Buscombe, W. (1962), "Spectral classification of Southern fundamental stars", Mount Stromlo Observatory Mimeogram, 4: 1, Bibcode:1962MtSOM...4....1B.
  15. "VizieR".
  16. "WDS Identifier". January 31, 2009. Archived from the original on January 31, 2009.
  17. Mitchell, D. S.; S. Frink; A. Quirrenbach; D. A. Fischer; G. W. Marcy; R. P. Butler (January 5, 2004), "Four Substellar Companions Found Around K Giant Stars", Bulletin of the American Astronomical Society, 35#5; AAS 203rd Meeting; Session 17 Extra Solar Planets, 203: 17.03, Bibcode:2003AAS...203.1703M.

External links

Constellation of Aquarius
Stars
Bayer
Flamsteed
Variable
HR
HD
Other
Exoplanets
Star clusters
Nebulae
Galaxies
NGC
Other
Galaxy clusters
Astronomical events
Category


Categories:
91 Aquarii Add topic