3 Piscis Austrini

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3 Piscis Austrini
Microscopium constellation map.svg
Red circle.svg
Location of 3 PsA (circled)
Observation data
Epoch J2000.0        Equinox J2000.0 (ICRS)
Constellation Microscopium [1]
Right ascension 21h 13m 17.32730s [2]
Declination −27° 37 09.7106 [2]
Apparent magnitude  (V)5.39±0.01 [3]
Characteristics
Spectral type K3 III [4]
B−V color index +1.42 [5]
Astrometry
Radial velocity (Rv)−46.2±2.4 [6] km/s
Proper motion (μ)RA: +98.513 mas/yr [2]
Dec.: −110.906 mas/yr [2]
Parallax (π)8.0734±0.1733  mas [2]
Distance 404 ± 9  ly
(124 ± 3  pc)
Absolute magnitude  (MV)+0.19 [1]
Details
Mass 1.58 [7]   M
Radius 31.3±1.6 [8]   R
Luminosity 184+9
8
[2]   L
Surface gravity (log g)1.86 [9]   cgs
Temperature 4,225±123 [10]   K
Metallicity [Fe/H]−0.17 [9]   dex
Rotational velocity (v sin i)<1 [11]  km/s
Age 2.59+0.83
1.90
[2]   Gyr
Other designations
3 PsA, 58 G. Microscopii [12] , CD−28°17178, CPD−28°7411, FK5 1556, GC 29652, HD 201901, HIP 104750, HR 8110, SAO 190129 [13]
Database references
SIMBAD data

3 Piscis Austrini, also known as HD 201901 or simply 3 PsA, is an astrometric binary [14] (100% chance [15] ) located in the southern constellation Microscopium. It was once part of Piscis Austrinus, the southern fish. The system has a combined apparent magnitude of 5.39, [3] making it faintly visible to the naked eye under ideal conditions. Gaia DR3 parallax measurements imply a distance of 404 light years [2] and it is currently approaching the Solar System with a heliocentric radial velocity of −46.2  km/s . [6] At its current distance, 3 PsA's brightness is diminished by 0.12 magnitudes due to extinction from interstellar dust [16] and it has an absolute magnitude of +0.19. [1]

The visible component is an evolved red giant with a stellar classification of K3 III. [4] The interferometry-measured angular diameter of the star, after correcting for limb darkening, is 2.03±0.04  mas , [17] which, at its estimated distance, equates to a physical radius of about 20 times the radius of the Sun. [18] However, its actual empirical radius is 31.3  R. [8] It has 1.58 times the mass of the Sun [7] and is radiating 184 times the luminosity of the Sun [2] from its enlarged photosphere at an effective temperature of 4,225  K . [10] 3 PsA is metal deficient with an iron abundance 68% that of the Sun ([Fe/H] = −0.17) [9] and it spins too slowly for its projected rotational velocity to be measured accurately. [11] It is estimated to be 2.59 billion years old based on Gaia DR3 models. [2]

References

  1. 1 2 3 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. XHIP record for this object at VizieR.
  2. 1 2 3 4 5 6 7 8 9 10 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.
  3. 1 2 Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P.; Wicenec, A. (March 2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27 –L30. Bibcode:2000A&A...355L..27H. ISSN   0004-6361. S2CID   17128864.
  4. 1 2 Houk, N. (1982). Michigan Catalogue of Two-dimensional Spectral Types for the HD stars. Volume III: Declinations −40° to −26°. Bibcode:1982mcts.book.....H.
  5. Johnson, H. L.; Mitchell, R. I.; Iriarte, B.; Wisniewski, W. Z. (1966). "UBVRIJKL Photometry of the Bright Stars". Communications of the Lunar and Planetary Laboratory. 4: 99–110. Bibcode:1966CoLPL...4...99J.
  6. 1 2 Gontcharov, G. A. (November 2006). "Pulkovo Compilation of Radial Velocities for 35,495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759–771. arXiv: 1606.08053 . Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065. eISSN   1562-6873. ISSN   1063-7737. S2CID   119231169.
  7. 1 2 Anders, F.; et al. (August 2019). "Photo-astrometric distances, extinctions, and astrophysical parameters for Gaia DR2 stars brighter than G = 18". Astronomy & Astrophysics. 628: A94. arXiv: 1904.11302 . Bibcode:2019A&A...628A..94A. doi: 10.1051/0004-6361/201935765 . eISSN   1432-0746. ISSN   0004-6361. S2CID   131780028.
  8. 1 2 Kervella, P.; Thévenin, F.; Di Folco, E.; Ségransan, D. (October 2004). "The angular sizes of dwarf stars and subgiants. Surface brightness relations calibrated by interferometry". Astronomy & Astrophysics. 426 (1): 297–307. arXiv: astro-ph/0404180 . Bibcode:2004A&A...426..297K. doi: 10.1051/0004-6361:20035930 . eISSN   1432-0746. ISSN   0004-6361. S2CID   6077801.
  9. 1 2 3 McWilliam, Andrew (December 1990). "High-resolution spectroscopic survey of 671 GK giants. I - Stellar atmosphere parameters and abundances". The Astrophysical Journal Supplement Series. 74: 1075. Bibcode:1990ApJS...74.1075M. doi: 10.1086/191527 . eISSN   1538-4365. ISSN   0067-0049.
  10. 1 2 Stassun, Keivan G.; et al. (9 September 2019). "The Revised TESS Input Catalog and Candidate Target List". The Astronomical Journal. 158 (4): 138. arXiv: 1905.10694 . Bibcode:2019AJ....158..138S. doi: 10.3847/1538-3881/ab3467 . eISSN   1538-3881. hdl: 1721.1/124721 . S2CID   166227927.
  11. 1 2 De Medeiros, J. R.; Alves, S.; Udry, S.; Andersen, J.; Nordström, B.; Mayor, M. (January 2014). "A catalog of rotational and radial velocities for evolved stars V: Southern stars *". Astronomy & Astrophysics. 561: A126. arXiv: 1312.3474 . Bibcode:2014A&A...561A.126D. doi: 10.1051/0004-6361/201220762 . eISSN   1432-0746. ISSN   0004-6361. S2CID   54046583.
  12. Gould, Benjamin Apthorp (1878). "Uranometria Argentina : brillantez y posicion de las estrellas fijas, hasta la septima magnitud, comprendidas dentro de cien grados del polo austral : con atlas". Resultados del Observatorio Nacional Argentino. 1. Bibcode:1879RNAO....1.....G.
  13. "HD 201901". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 2019-04-11.
  14. Eggleton, P. P.; Tokovinin, A. A. (11 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 . eISSN   1365-2966. ISSN   0035-8711. S2CID   14878976.
  15. Frankowski, A.; Jancart, S.; Jorissen, A. (19 December 2006). "Proper-motion binaries in the Hipparcos catalogue: Comparison with radial velocity data". Astronomy & Astrophysics. 464 (1): 377–392. arXiv: astro-ph/0612449 . Bibcode:2007A&A...464..377F. doi: 10.1051/0004-6361:20065526 . eISSN   1432-0746. ISSN   0004-6361. S2CID   14010423.
  16. Gontcharov, George A.; Mosenkov, Aleksandr V. (28 September 2017). "Verifying reddening and extinction for Gaia DR1 TGAS main sequence stars". Monthly Notices of the Royal Astronomical Society. 472 (4): 3805–3820. arXiv: 1709.01160 . Bibcode:2017MNRAS.472.3805G. doi: 10.1093/mnras/stx2219 . eISSN   1365-2966. ISSN   0035-8711. S2CID   118879856.
  17. Richichi, A.; Percheron, I.; Khristoforova, M. (February 2005). "CHARM2: An updated Catalog of High Angular Resolution Measurements". Astronomy & Astrophysics. 431 (2): 773–777. Bibcode:2005A&A...431..773R. doi: 10.1051/0004-6361:20042039 . eISSN   1432-0746. ISSN   0004-6361. S2CID   122267643.
  18. 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: