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For other stars with this Bayer designation, see ψ Piscium (disambiguation).
Psi2 Piscium
Location of ψ2 Piscium (circled)
Observation data
Epoch J2000.0       Equinox J2000.0 ( ICRS)
Constellation Pisces
Right ascension 01h 07m 57.16387s [1]
Declination +20° 44′ 20.8310″ [1]
Apparent magnitude (V) +5.56 [2]
Characteristics
Spectral type A3 V [3]
B−V color index +0.12 [2]
Astrometry
Radial velocity (Rv)−15.2±0.9 [4] km/s
Proper motion (μ) RA: +86.72 [1]  mas/ yr
Dec.: −82.75 [1]  mas/ yr
Parallax (π)21.14 ± 0.77  mas [1]
Distance154 ± 6  ly
(47 ± 2  pc)
Absolute magnitude (MV)+2.19 [5]
Details
Mass1.82 [6]  M☉
Radius2.0 [7]  R☉
Luminosity13 [3]  L☉
Surface gravity (log g)4.36±0.14 [6]  cgs
Temperature8,611±293 [6]  K
Rotational velocity (v sin i)149 [3] km/s
Age250 [6]  Myr
Other designations
ψ2 Psc, 79 Piscium, BD+19° 185, HD 6695, HIP 5310, HR 328, SAO 74506 [8]
Database references
SIMBAD data

Psi2 Piscium (ψ2 Piscium) is a white-hued star in the zodiac constellation of Pisces. It is faintly visible to the naked eye, having an apparent visual magnitude of +5.56. [2] Based upon an annual parallax shift of 8.66  mas as seen from Earth, [1] it is located about 380  light years from the Sun. It has a peculiar velocity of 14.6±2.9 km/s, indicating it is a runaway star. [9]

This is a suspected binary star system, [10] with a companion star at an angular separation of 0.357±0.002  arc seconds along a position angle of 174.99°±0.30° from the primary, as of 2008. This corresponds to a projected separation of 16.88±0.62 AU. [11] The brighter component is an A-type main sequence star with a stellar classification of A3 V. [3] The system is a source of X-ray emission with a luminosity of 143.9×1020  W, which is most likely originating from the cooler companion since A-type main sequence stars are not expected to be magnetically active. [12]

References

  1. ^ a b c d e f van Leeuwen, F. (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.
  2. ^ a b c Høg, E.; et al. (March 2000), "The Tycho-2 catalogue of the 2.5 million brightest stars", Astronomy and Astrophysics, 355: L27–L30, Bibcode: 2000A&A...355L..27H, doi: 10.1888/0333750888/2862.
  3. ^ a b c d Zorec, J.; Royer, F. (January 2012), "Rotational velocities of A-type stars. IV. Evolution of rotational velocities", Astronomy & Astrophysics, 537: A120, arXiv: 1201.2052, Bibcode: 2012A&A...537A.120Z, doi: 10.1051/0004-6361/201117691, S2CID  55586789.
  4. ^ de Bruijne, J. H. J.; Eilers, A.-C. (October 2012), "Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project", Astronomy & Astrophysics, 546: 14, arXiv: 1208.3048, Bibcode: 2012A&A...546A..61D, doi: 10.1051/0004-6361/201219219, S2CID  59451347, A61.
  5. ^ 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.
  6. ^ a b c d 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.
  7. ^ Pasinetti Fracassini, L. E.; et al. (February 2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS)", Astronomy and Astrophysics, 367 (Third ed.): 521–524, arXiv: astro-ph/0012289, Bibcode: 2001A&A...367..521P, doi: 10.1051/0004-6361:20000451, S2CID  425754.
  8. ^ "psi02 Psc". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-07-23.{{ cite web}}: CS1 maint: postscript ( link)
  9. ^ Tetzlaff, N.; et al. (January 2011), "A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun", Monthly Notices of the Royal Astronomical Society, 410 (1): 190–200, arXiv: 1007.4883, Bibcode: 2011MNRAS.410..190T, doi: 10.1111/j.1365-2966.2010.17434.x, S2CID  118629873.
  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. ^ De Rosa, R. J.; et al. (2012), "The Volume-limited A-Star (VAST) survey - II. Orbital motion monitoring of A-type star multiples", Monthly Notices of the Royal Astronomical Society, 422 (4): 2765, arXiv: 1112.3666, Bibcode: 2012MNRAS.422.2765D, doi: 10.1111/j.1365-2966.2011.20397.x, S2CID  102487103.
  12. ^ Schröder, C.; Schmitt, J. H. M. M. (November 2007), "X-ray emission from A-type stars", Astronomy and Astrophysics, 475 (2): 677–684, Bibcode: 2007A&A...475..677S, doi: 10.1051/0004-6361:20077429.
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