64 Piscium

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Double star
64 Piscium
Observation
dates equinox :  J2000.0 , epoch : J2000.0
AladinLite
Constellation fishes
Right ascension 00 h 48 m 58.71 s
declination + 16 ° 56 ′ 26.3 ″
Apparent brightness  5.07 likes
Astrometry
Radial velocity +3.76 ± 0.08 km / s
parallax 43.496 ± 0.089 mas
distance  75.0 ± 0.2 ly
(22.99 ± 0.05 pc )
Absolute visual brightness M vis 3.26 mag
Absolute bolometric magnitude M bol ≈ 3.17 mag
Proper movement :
Rec. Share: −2.87 ± 0.29 mas / a
Dec. portion: −202.05 ± 0.24 mas / a
orbit 
period 13.824 491 ± 0.000 043 d
Major semi-axis 6.545 ± 0.014 mas
(≙ 0.15 AU )
eccentricity 0.236 57 ± 0.000 63
Orbit inclination 73.92 ± 0.80 °
Argument of the node 207.41 ± 0.65 °
Epoch of the periastron MJD 50 905.974 6 ± 0.006 7
Argument of the periapsis 203.057 ± 0.073 °
Individual data
Names Aa; From
Observation data:
Apparent brightness Aa ≈ 5.70 mag
From ≈ 5.95 mag
Typing:
Spectral class Aa F8 V
From F8 V
Physical Properties:
Absolute vis.
Brightness M vis 		Aa ≈ 3.89 mag
From ≈ 4.14 mag
Absolute bol.
Brightness M bol 		Aa ≈ 3.81 mag
From ≈ 4.05 mag
Dimensions Aa 1.223 ± 0.021 M ☉
From 1.170 ± 0.018 M ☉
radius Aa 1.25 ± 0.08 R ☉
From 1.18 ± 0.10 R ☉
Luminosity Aa 2.1 ± 0.2 L ☉
From 1.8 ± 0.2 L ☉
Effective temperature Aa 6 250 ± 150 K
From 6 200 ± 200 K
Age ≈ 5 billion a
Other names
and catalog entries
Flamsteed name 64 Piscium
Bonn survey BD + 16 ° 76
Bright Star Catalog HR 225 [1]
Henry Draper Catalog HD 4676 [2]
SAO catalog SAO 92099 [3]
Tycho catalog TYC 1188-1686-1 [4]
Hipparcos catalog HIP 3810 [5]
WDS catalog WDS 00490 + 1656
Further designations: FK5 1020; Eq 34.1; GJ 9031; LTT 10290; CCDM 00490 + 1656

64 Piscium ( 64 Psc for short ) is a double star in the constellation Pisces . 64 Psc has an apparent magnitude of 5.07 mag and is 75 light-years from the sun .

It is a spectroscopic double star of the type SB2 ( double-lined spectroscopic binary ) with an orbital period of 13.82 days. The single stars 64 Psc Aa and 64 Psc Ab (together called 64 Psc A ) are sun-like , both belong to the spectral class F8 and are otherwise very similar in their physical properties. The very precisely known masses, radii, effective temperatures and luminous forces for 64 Psc Aa are 1.2  M ⊙ , 1.3  R ⊙ , 6 250  K and 2.1  L ⊙ and for 64 Psc Ab are 1.2 M ⊙ , 1.2 R ⊙ , 6 200 K and 1.8 L ⊙ . In 2005 Maciej Konacki presented a new method for the high-precision measurement of the radial velocity of components in SB2 binary stars and determined the stellar masses with an accuracy of almost 1 percent ( M Aa  = 1.210 ± 0.014 M ⊙ , M Ab  = 1.169 ± 0.014 M ⊙ ). The relative orbit of the double star is moderately eccentric ( e  = 0.24) and has a major semi-axis of 6.55 mas (0.15 AU ). During one orbit, the greatest or smallest possible distance between the stars is 0.19 AU ( Apastron ) or 0.11 AU (Periastron).

With [Fe / H]  = 0.00, the system has a similar metal abundance as the sun. The age of the system is around 5 billion years, but there are also age determinations with values ​​of ≈ 3 billion years and 6.8 billion years. In the future 3 billion years, when both stars have developed into subgiants , the mass flow to the component Ab should start at 64 Psc Aa (with a radius of ≈ 12.4 R ⊙ ). With a star system age of ≈ 8 billion years one can expect a double system of two white dwarfs .

Another celestial body could be in orbit around 64 Psc A, as the evaluation of astrometric data from Hipparcos and other star catalogs suggests irregular proper motion. Andrei Tokovinin, et al. estimate for this uncertain celestial body a mass of 0.05 M ⊙ and an orbital period of ≈ 10 years around 64 Psc A.

The Washington Double Star Catalog lists two visual companions (distance ρ and position angle θ to 64 Psc A):

  • 64 Psc B: V = 12.9 mag, ρ = 85.6 ″, θ = 331 ° (epoch 2013)
  • 64 Psc C: V = 13.6 mag, ρ = 61.1 ″, θ = 161 ° (epoch 2013)

In 1998,  two background objects with K brightnesses of 16.6 mag and 18.5 mag at intervals of 22.7 were found in the infrared range (J, H and K bands, λ = 1.2 - 2.2 µm) ″ And 12.1 ″ to 64 Psc A. A third physical companion was not proven.

64 Psc shows an infrared excess at 24 µm wavelength, as was determined with the MIPS instrument of the Spitzer Space Telescope , and was therefore published in 2010 by David W. Koerner et al. classified as a debris disk candidate.

Web link

Individual evidence

  1. ^ Floor van Leeuwen: VizieR Online Data Catalog: Hipparcos, the New Reduction (van Leeuwen, 2007) . In: VizieR On-line Data Catalog: I / 311. Originally published in: 2007A & A ... 474..653V . 2008. bibcode : 2008yCat.1311 .... 0V . VizieR catalog entry .
  2. ^ Dorrit Hoffleit, Wayne H. Warren Jr .: VizieR Online Data Catalog: Bright Star Catalog, 5th Revised Ed. (Hoffleit +, 1991) . In: VizieR On-line Data Catalog: V / 50. Originally published in: 1964BS .... C ...... 0H . 1995. bibcode : 1995yCat.5050 .... 0H . VizieR catalog entry .
  3. ↑ Antoine Duquennoy, Michel Mayor : Multiplicity among solar-type stars in the solar neighborhood. II - Distribution of the orbital elements in an unbiased sample . In: Astronomy and Astrophysics , Vol. 248, Ausg. 2, 1991, p. 495. bibcode : 1991A & A ... 248..485D .
  4. ↑ a b c d Maciej Konacki : Precision Radial Velocities of Double-lined Spectroscopic Binaries with an Iodine Absorption Cell . In: The Astrophysical Journal . Vol. 626, Ed. 1, 2005, pp. 431-438. bibcode : 2005ApJ ... 626..431K , doi: 10.1086 / 429880 , arxiv : astro-ph / 0410389 .
  5. ↑ Derived from parallax ( π = 43.496 ± 0.089 mas, Konacki 2005).
  6. ↑ a b c d e Klaus Fuhrmann: Nearby stars of the Galactic disc and halo - IV . In: Monthly Notices of the Royal Astronomical Society , Vol. 384, Aus. 1, pp. 183-184. doi: 10.1111 / j.1365-2966.2007.12671.x , bibcode : 2008MNRAS.384..173F .
  7. ↑ a b c d e f Guillermo Torres, Johannes Andersen, Álvaro Giménez: Accurate masses and radii of normal stars: Modern results and applications . In: The Astronomy and Astrophysics Review . Vol. 18, Ed. 1–2, 2010. bibcode : 2010A & ARv..18 ... 67T , doi: 10.1007 / s00159-009-0025-1 , arxiv : 0908.2624 .
  8. ↑ a b c Jesús Maldonado et al. : VizieR Online Data Catalog: Metallicity of solar-type stars (Maldonado +, 2012) . In: VizieR On-line Data Catalog: J / A + A / 541 / A40. Originally published in: 2012A & A ... 541A..40M . 2012. bibcode : 2012yCat..35410040M . VizieR catalog entry .
  9. ↑ a b Andrew F. Boden et al. : The Visual Orbit of 64 Piscium . In: The Astrophysical Journal . Vol. 527, Ed. 1, 1999, pp. 360-368. bibcode : 1999ApJ ... 527..360B , doi: 10.1086 / 308067 , arxiv : astro-ph / 9905207 .
  10. ↑ True major semiaxis calculated from the distance to the sun d in AU (22.99 pc ≈ 4 742 000 AU) and major semiaxis a in degrees (6.545 mas ≈ 0.000 001 818 °) according to 2d tan (a / 2) = 0, 15 AU. Smallest distance = 0.15 AU (1 - eccentricity) = 0.11 AU. Largest distance = 0.15 AU (1 + eccentricity) = 0.19 AU.
  11. ↑ Laura Vican: Age Determination for 346 Nearby Stars in the Herschel DEBRIS Survey . In: The Astronomical Journal . Bd. 143, Ausg. 6, 2012, Art.-ID 135. bibcode : 2012AJ .... 143..135V , doi: 10.1088 / 0004-6256 / 143/6/135 , arxiv : 1203.1966 . VizieR catalog entry .
  12. ↑ George A. Gontcharov et al. : VizieR Online Data Catalog: Proper motions of fundamental stars (PMFS) (Gontcharov +, 2001) . In: VizieR On-line Data Catalog: I / 266. Originally published in: 2001A & A ... 365..222G . 2000. bibcode : 2000yCat.1266 .... 0G . VizieR catalog entry .
  13. ↑ Andrei Tokovinin et al. : VizieR Online Data Catalog: Companions to close spectroscopic binaries (Tokovinin +, 2006) . In: VizieR On-line Data Catalog: J / A + A / 450/681. Originally published in: 2006A & A ... 450..681T . 2007. bibcode : 2007yCat..34500681T . VizieR catalog entry .
  14. ↑ Brian D. Mason et al. : VizieR Online Data Catalog: The Washington Visual Double Star Catalog (Mason + 2001-2014) . Vers. 2019-08-26. In: VizieR On-line Data Catalog: B / wds. Originally published in: 2001AJ .... 122.3466M . 2019. bibcode : 2019yCat .... 102026M . VizieR catalog entry .
  15. ↑ David W. Koerner et al. : New Debris Disk Candidates Around 49 Nearby Stars . In: The Astrophysical Journal Letters . Vol. 710, Issue 1, 2010, L28. bibcode : 2010ApJ ... 710L..26K . doi: 10.1088 / 2041-8205 / 710/1 / L26 .