2 Piscis Austrini

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2 Piscis Austrini
Microscopium constellation map.svg
Red circle.svg
Location of 2 PsA (circled)
Observation data
Epoch J2000.0        Equinox J2000.0 (ICRS)
Constellation Microscopium
Right ascension 21h 06m 24.67730s [1]
Declination −32° 20′ 29.8282″ [1]
Apparent magnitude  (V)5.20±0.01 [2]
Characteristics
Evolutionary stage horizontal branch [3]
Spectral type K2 III [4] or K3 III [5]
B−V color index +1.10 [6]
Astrometry
Radial velocity (Rv)3.1±2.8 [7]  km/s
Proper motion (μ)RA: −5.949  mas/yr [1]
Dec.: +7.786  mas/yr [1]
Parallax (π)9.2085 ± 0.0973  mas [1]
Distance 354 ± 4  ly
(109 ± 1  pc)
Absolute magnitude  (MV)+0.19 [8]
Details
Mass 2.36 [9]   M☉
Radius 16.4 [10]   R☉
Luminosity 122±2 [11]   L☉
Surface gravity (log g)2.88±0.15 [12]   cgs
Temperature 4,632±24 [13]   K
Metallicity [Fe/H]−0.01 [14]   dex
Rotational velocity (v sin i)<1.2 [15]  km/s
Age 930 [9]   Myr
Other designations
2 PsA, 49 G. Microscopii [16] , CD−32°16398, CPD−32°6288, GC  29465, HD  200763, HIP  104174, HR  8076, SAO  212716 [17]
Database references
SIMBAD data

2 Piscis Austrini, also known as HD 200763 or simply 2 PsA, is a solitary orange hued star [18] located in the southern constellation Microscopium. It was once part of Piscis Austrinus, the southern fish. The object has an apparent magnitude of 5.2, [2] making it faintly visible to the naked eye under ideal conditions. Based on parallax measurements from the Gaia satellite, it is estimated to be 354 light years away from the Solar System. [1] However, it is receding with a poorly constrained heliocentric radial velocity of 3.1  km/s . [7] At its current distance, 2 PsA's brightness is diminished by 0.11 magnitudes due to interstellar dust. [19] It has an absolute magnitude of 0.19. [8]

This is an evolved star with a stellar classification of either K2 III or K3 III. [4] [5] Nevertheless, both indicate that the object is a red giant. 2 PsA is estimated to be 930 million years old, [9] enough time for it to cool and expand to 16.4 times the Sun's radius. [10] It is currently on the horizontal branch (HB), generating energy through helium fusion at its core. [3] The star is located in a metal rich region of the HB called the red clump. At present 2 PsA has 2.36 times the mass of the Sun and is radiating 122 times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,632  K . [13] 2 PsA has a solar metallicity and spins slowly with a projected rotational velocity lower than 1.2  km/s . [15]

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<span class="mw-page-title-main">3 Piscis Austrini</span> Star in the constellation Microscopium

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<span class="mw-page-title-main">14 Trianguli</span> Star in the constellation Triangulum

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<span class="mw-page-title-main">HD 198716</span> Star in the constellation of Microscopium

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<span class="mw-page-title-main">HD 196737</span> K-type giant; Microscopium

HD 196737, also designated as HR 7893, is a solitary orange hued star located in the southern constellation Microscopium. It has an apparent magnitude of 5.47, allowing it to be faintly visible to the naked eye. The object is located relatively close at a distance of 241 light years based on Gaia DR3 parallax measurements, but is receding with a heliocentric radial velocity of 14.2 km/s. At its current distance, HD 196737's brightness is diminished by 0.14 magnitudes due to interstellar dust. It has an absolute magnitude of 1.17.

<span class="mw-page-title-main">HD 168592</span> Star in the constellation of Corona Australis

HD 168592, also designated as HR 6862 or rarely 7 G. Coronae Australis, is a solitary star located in the southern constellation Corona Australis. It is faintly visible to the naked eye as an orange-hued star with an apparent magnitude of 5.07. Gaia DR3 parallax measurements place it at a distance of 490 light years and is currently receding with a heliocentric radial velocity of 18 km/s. At its current distance, HD 168592's brightness is diminished by 0.38 magnitudes due to interstellar dust. It has an absolute magnitude of −0.76.

<span class="mw-page-title-main">HD 31134</span> Star in the constellation of Camelopardalis

HD 31134, also designated as HR 1561, is a solitary star located in the northern circumpolar constellation Camelopardalis, the giraffe. It is faintly visible to the naked eye as a white-hued star with an apparent magnitude of 5.74. Gaia DR3 parallax measurements place it 473 light years away. It appears to be approaching the Solar System with a heliocentric radial velocity of −15.1 km/s. At its current distance, HD 31134's brightness is diminished by 0.35 magnitudes due to interstellar dust. It has an absolute magnitude of +0.19.

<span class="mw-page-title-main">HD 10390</span> B-type main-sequence star; Triangulum

HD 10390 is a solitary star located in the northern constellation Triangulum. It is faintly visible to the naked eye as a bluish-white hued point of light with an apparent magnitude of 5.64. The object is located relatively close at a distance of 292 light-years based on Gaia DR3 parallax measurements and it is drifting closer with a heliocentric radial velocity of −1.9 km/s. At its current distance, HD 10390's brightness is diminished by an interstellar extinction of only five-hundredths of a magnitude and it has an absolute magnitude of +1.00.

References

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  3. 1 2 Alves, David R. (20 August 2000). "K‐Band Calibration of the Red Clump Luminosity". The Astrophysical Journal. 539 (2): 732–741. arXiv: astro-ph/0003329 . Bibcode:2000ApJ...539..732A. doi: 10.1086/309278 . eISSN   1538-4357. ISSN   0004-637X. S2CID   16673121.
  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. 1 2 Hofleit, Dorrit (June 1943). "Spectroscopic absolute magnitudes of 365 southern K-type stars". Harvard College Observatory Circular. 449: 1–11. Bibcode:1943HarCi.449....1H.
  6. ↑ Lake, R. (1965). "Photometric Magnitudes and Colours for Bright Southern Stars (Sixth List)". Monthly Notes of the Astronomical Society of South Africa. 24: 41. Bibcode:1965MNSSA..24...41L. ISSN   0024-8266.
  7. 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.
  8. 1 2 Anderson, E.; Francis, Ch. (May 2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331–346. arXiv: 1108.4971 . Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. eISSN   1562-6873. ISSN   1063-7737. S2CID   119257644.
  9. 1 2 3 Demarque, Pierre; Woo, Jong‐Hak; Kim, Yong‐Cheol; Yi, Sukyoung K. (December 2004). "Y'2 Isochrones with an Improved Core Overshoot Treatment". The Astrophysical Journal Supplement Series. 155 (2): 667–674. arXiv: astro-ph/0409024 . Bibcode:2004ApJS..155..667D. doi: 10.1086/424966 . eISSN   1538-4365. ISSN   0067-0049.
  10. 1 2 Kervella, P.; Thévenin, F.; Di Folco, E.; Ségransan, D. (October 2004). "The angular sizes of dwarf stars and subgiants". 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.
  11. ↑ Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics . 616. A1. arXiv: 1804.09365 . Bibcode: 2018A&A...616A...1G . doi: 10.1051/0004-6361/201833051 . Gaia DR2 record for this source at VizieR.
  12. ↑ Gomes da Silva, J.; Santos, N. C.; Adibekyan, V.; Sousa, S. G.; Campante, T. L.; Figueira, P.; Bossini, D.; Delgado-Mena, E.; Monteiro, M. J. P. F. G.; de Laverny, P.; Recio-Blanco, A.; Lovis, C. (February 2021). "Stellar chromospheric activity of 1674 FGK stars from the AMBRE-HARPS sample". Astronomy & Astrophysics. 646: A77. arXiv: 2012.10199 . Bibcode:2021A&A...646A..77G. doi: 10.1051/0004-6361/202039765 . eISSN   1432-0746. ISSN   0004-6361.
  13. 1 2 Luck, R. Earle (25 August 2015). "Abundances in the Local Region. I. G and K Giants". The Astronomical Journal. 150 (3): 88. arXiv: 1507.01466 . Bibcode:2015AJ....150...88L. doi:10.1088/0004-6256/150/3/88. eISSN   1538-3881. ISSN   0004-6256. S2CID   118505114.
  14. ↑ 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.
  15. 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". Astronomy & Astrophysics. 561: A126. arXiv: 1312.3474 . Bibcode:2014A&A...561A.126D. doi: 10.1051/0004-6361/201220762 . eISSN   1432-0746. ISSN   0004-6361.
  16. ↑ 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.
  17. ↑ "HD 200763". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 2019-04-08.
  18. ↑ 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.
  19. ↑ 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.
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