Astronomy:UV Piscium

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Short description: Binary star system in the Pisces constellation
UV Piscium
UVPscLightCurve.png
A light curve for UV Piscium plotted from TESS data[1]
Observation data
Equinox J2000.0]] (ICRS)
Constellation Pisces
Right ascension  01h 16m 55.119s[2]
Declination +06° 48′ 42.13″[2]
Apparent magnitude (V) 8.98[3]
Characteristics
Primary
Evolutionary stage Main sequence
Spectral type G5V[4]
B−V color index 0.65±0.02[4]
Variable type Detached Algol + RS CVn[5]
Secondary
Evolutionary stage Main sequence
Spectral type K3V[4]
B−V color index 1.04±0.07[4]
Astrometry
Radial velocity (Rv)6.45±0.40[6] km/s
Proper motion (μ) RA: +85.250[2] mas/yr
Dec.: +20.946[2] mas/yr
Parallax (π)14.0593 ± 0.0236[2] mas
Distance232.0 ± 0.4 ly
(71.1 ± 0.1 pc)
Absolute magnitude (MV)4.48±0.05[4]
Orbit[7]
Period (P)0.86104716 d
Eccentricity (e)0.0 (assumed)
Inclination (i)88.9±2.0[4]°
Periastron epoch (T)2,448,897.4226±0.0003 HJD
Semi-amplitude (K1)
(primary)		117.20±0.18 km/s
Semi-amplitude (K2)
(secondary)		154.81±0.37 km/s
Details[7]
Primary
Mass1.0225±0.0058 M☉
Radius1.096 R☉
Surface gravity (log g)4.340±0.018 cgs
Temperature5,780±100 K
Metallicity [Fe/H]0.025±0.066[8] dex
Rotation0.86 d
Rotational velocity (v sin i)71.01+0.37
−0.36 km/s
Age4.7 Gyr
Secondary
Mass0.7741±0.0034 M☉
Radius0.829 R☉
Surface gravity (log g)4.478±0.019 cgs
Temperature4,750±80 K
Rotation0.86 d
Rotational velocity (v sin i)51.66+1.25
−1.20 km/s
Other designations
UV Psc, BD+06°189, HD 7700, HIP 5980, SAO 109778[9]
Database references
SIMBADdata

UV Piscium is a binary star system in the constellation of Pisces. With a peak apparent visual magnitude of 8.98,[3] it is too faint to be visible to the naked eye. This is an eclipsing binary system that decreases to magnitude 10.05 during the primary eclipse, then to magnitude 9.54 with the secondary eclipse. It is located at a distance of 232 light years from the Sun based on parallax measurements,[2] and is receding with a radial velocity of 6.5 km/s.[6] The position of this star near the ecliptic means it is subject to lunar occultation.[10]

This star was found to be variable by H. Huth in 1959.[11] He determined it to be an eclipsing binary and published the first light curve with a period of 20.67 hours. R. B. Carr in 1969 proposed this to be an Algol-type variable with a minor tidal distortion of the components, plus a large, anomalous asymmetry in the light curve.[12] D. S. Hall in 1976 grouped it among the class of short-period RS CVn binaries.[13] The following year, variable, non-thermal radio emission was detected coming from this system, the first such discovered for a short-period binary.[14]

Daniel M. Popper in 1969 found a double-lined, G-type spectrum with both components showing emission in the H and K lines.[15] In 1979, A. R. Sadik deduced the system is a detached binary and suggested a bright, hot spot may produce the observed asymmetry in the light curve. He found stellar classifications of G2V and K0IV for the primary and secondary components, respectively.[12] With improved spectra, Popper found main sequence classes of G5 and K3 for the two stars.[4] The presence of a prominence was deduced in 1992, and a flare of hydrogen alpha was observed the following year.[16]

This is a close binary system with an orbital period of 0.86 days. The orbit is circular and the components are spinning rapidly in-sync with their orbital period. This rotation rate is making both stars magnetically active, with average magnetic field strengths of 137 G and 88 G for the primary and secondary, respectively. Magnetic activity cycles appear to be causing the orbital period to oscillate with a 61 year period.[17] The primary is a G-type main-sequence star of about the same size and mass as the Sun, while the secondary is a smaller K-type main-sequence star. They are estimated to be about 4.6 billion years old.[7]

References

  1. ↑ "MAST: Barbara A. Mikulski Archive for Space Telescopes". Space Telescope Science Institute. https://mast.stsci.edu/portal/Mashup/Clients/Mast/Portal.html. 
  2. ↑ 2.0 2.1 2.2 2.3 2.4 Brown, A. G. A. (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics 649: A1. doi:10.1051/0004-6361/202039657. Bibcode: 2021A&A...649A...1G.  Gaia EDR3 record for this source at VizieR.
  3. ↑ 3.0 3.1 Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters 38 (5): 331, doi:10.1134/S1063773712050015, Bibcode: 2012AstL...38..331A. 
  4. ↑ 4.0 4.1 4.2 4.3 4.4 4.5 4.6 Popper, Daniel M. (September 1997), "Orbits of detached main-sequence eclipsing binaries of types late F to K. II. UV Leonis, UV Piscium, and BH Virginis", The Astronomical Journal 114: 1195, doi:10.1086/118552, Bibcode: 1997AJ....114.1195P. 
  5. ↑ Samus, N. N. et al. (2017), "General Catalogue of Variable Stars", Astronomy Reports, 5.1 61 (1): 80–88, doi:10.1134/S1063772917010085, Bibcode: 2017ARep...61...80S. 
  6. ↑ 6.0 6.1 Karataș, Yüksel et al. (2004), "Kinematics of chromospherically active binaries and evidence of an orbital period decrease in binary evolution", Monthly Notices of the Royal Astronomical Society 349 (3): 1069–1092, doi:10.1111/j.1365-2966.2004.07588.x, Bibcode: 2004MNRAS.349.1069K. 
  7. ↑ 7.0 7.1 7.2 Hahlin, A. et al. (June 2021), "Magnetic field of the eclipsing binary UV Piscium", Astronomy & Astrophysics 650: 17, doi:10.1051/0004-6361/202140832, A197, Bibcode: 2021A&A...650A.197H. 
  8. ↑ Qian, S. -B. et al. (March 2018), "Physical Properties and Evolutionary States of EA-type Eclipsing Binaries Observed by LAMOST", The Astrophysical Journal Supplement Series 235 (1): 12, doi:10.3847/1538-4365/aaa601, 5, Bibcode: 2018ApJS..235....5Q. 
  9. ↑ "UV Psc". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=UV+Psc. 
  10. ↑ Herr, Richard B. (April 1969), "Identification List of Spectroscopic and Eclipsing Binaries Subject to Occultations by the Moon", Publications of the Astronomical Society of the Pacific 81 (479): 105, doi:10.1086/128748, Bibcode: 1969PASP...81..105H. 
  11. ↑ Huth, H. (1959), Mitteilungen über Veränderliche Sterne, 424. 
  12. ↑ 12.0 12.1 Sadik, A. R. (July 1979), "Light and Colour Curve Observations and Analysis of the Short Period Eclipsing Binary System UV Psc", Astrophysics and Space Science 63 (2): 319–349, doi:10.1007/BF00638905, Bibcode: 1979Ap&SS..63..319S. 
  13. ↑ Hall, D. S. (1976), Fitch, W. S., ed., "The RS CVN Binaries and Binaries with Similar Properties", Multiple Periodic Variable Stars, Proceedings of IAU Colloq. 29, held in Budapest, Hungary, 1–5 September 1975, Astrophysics and Space Science Library (D. Reidel Publishers) 60: p. 287, doi:10.1007/978-94-010-1175-4_15, ISBN 978-94-010-1177-8, Bibcode: 1976ASSL...60..287H. 
  14. ↑ Spangler, S. R. et al. (December 1977), "Radio survey of close binary stars", Astronomical Journal 82: 989–997, doi:10.1086/112161, Bibcode: 1977AJ.....82..989S. 
  15. ↑ Popper, Daniel M. (June 1969), "Twelve Eclipsing Binaries with Double-Lined Spectra", Bulletin of the American Astronomical Society 1: 257, Bibcode: 1969BAAS....1R.257P. 
  16. ↑ Liu, Quingyao et al. (April 1996), "A H-alpha Flare on UV Piscium", Information Bulletin on Variable Stars 4326: 1, Bibcode: 1996IBVS.4326....1L. 
  17. ↑ Qian, Shengbang et al. (1999), "Orbital period studies of the RS CVn-type binaries. II. UV Piscium", Astrophysics and Space Science 266 (4): 529–538, doi:10.1023/A:1002030722350, Bibcode: 1999Ap&SS.266..529Q. 

Further reading

  • Kjurkchieva, Diana P. et al. (February 2005), "Spectroscopic and Photometric Observations of the Short-Period RS CVn-Type Star UV Piscium", The Astronomical Journal 129 (2): 1084–1095, doi:10.1086/427396, Bibcode: 2005AJ....129.1084K. 
  • Lastennet, E. et al. (October 2003), "Disentangling discrepancies between stellar evolution theory and sub-solar mass stars. The influence of the mixing length parameter for the UV Psc binary", Astronomy and Astrophysics 409: 611–618, doi:10.1051/0004-6361:20031114, Bibcode: 2003A&A...409..611L. 
  • Vivekananda Rao, P.; Radhika, P. (2002), "Long-Term Study of the Starspot Activity on the Eclipsing Short-Period RS Canum Venaticorum Star UV Piscium", Astrophysics and Space Science 282 (1): 103–120, doi:10.1023/A:1021194218533, Bibcode: 2002Ap&SS.282..103V. 
  • Sowell, James R. et al. (October 2001), "Period Changes in Four Short-Period Spotted Binaries: UV Piscium, YY Geminorum, CG Cygni, and XY Ursae Majoris", The Astronomical Journal 122 (4): 1965–1973, doi:10.1086/323091, Bibcode: 2001AJ....122.1965S. 
  • Radhika, P.; Vivekananda Rao, P. (September 2001), "Long-term study of the starspot activity on the eclipsing short-period RS Canum Venaticorum binary UV Piscium", Bulletin of the Astronomical Society of India 29: 317–322, Bibcode: 2001BASI...29..317R. 
  • Qian, S. B. (2001), Brekke, Pål; Fleck, Bernhard; Gurman, Joseph B., eds., "Possible Magnetic Activity Cycles of Four Chromospherically Active Binaries: ER Vul, UV Psc, AR Lac and BH Vir", Recent Insights into the Physics of the Sun and Heliosphere: Highlights from SOHO and Other Space Missions, Proceedings of IAU Symposium 203 (Astronomical Society of the Pacific) 203: p. 437, ISBN 1-58381-069-2, Bibcode: 2001IAUS..203..437Q. 
  • Hughes, S. B. et al. (December 2000), "An Investigation of Period Changes for Four RS CVn Stars: UV Psc, YY Gem, CG Cyg, and XY UMa", American Astronomical Society, 197th AAS Meeting, id.46.17; Bulletin of the American Astronomical Society 32: p. 1479, Bibcode: 2000AAS...197.4617H. 
  • Heckert, Paul A. (November 1999), "1998 Photometry of UV Piscium", Information Bulletin on Variable Stars 4806: 1, Bibcode: 1999IBVS.4806....1H. 
  • Frederik, Marina C.; Etzel, Paul B. (May 1996), "A Photometric Analysis and SPOT Model of the Detached Eclipsing Binary UV Leonis", Astronomical Journal 111: 2081, doi:10.1086/117944, Bibcode: 1996AJ....111.2081F. 
  • Jassur, D. M. Z.; Kermani, M. H. (September 1994), "1992 UBV Observations of UV PISCIUM and Light Curve Analysis", Astrophysics and Space Science 219 (1): 35–47, doi:10.1007/BF00657858, Bibcode: 1994Ap&SS.219...35J. 
  • Jassur, D. M. Z.; Kermani, M. H. (June 1993), "UBV Photoelectric Observations of UV Piscium", Information Bulletin on Variable Stars 3896: 1, Bibcode: 1993IBVS.3896....1J. 
  • Popper, Daniel M. (August 1991), "Orbits of Close Binaries With CA II H and K in Emission. V. the Main-Sequence System UV Piscium", Astronomical Journal 102: 699, doi:10.1086/115904, Bibcode: 1991AJ....102..699P. 
  • Han, Won-Yong; Kim, Tu-Hwan (August 1988), "A Photometric Study of UV Piscium", Publications of the Astronomical Society of the Pacific 100: 964, doi:10.1086/132258, Bibcode: 1988PASP..100..964H. 
  • Akan, M. Can (April 1988), "Two-colour photoelectric photometry of UV PISCIUM and Fourier analysis of its out-of-eclipse light variations", Astrophysics and Space Science 143 (2): 367–376, doi:10.1007/BF00637148, Bibcode: 1988Ap&SS.143..367A. 
  • Ibanoglu, C. (December 1987), "The light curve variations in UV Piscium", Astrophysics and Space Science 139 (1): 139–147, doi:10.1007/BF00643819, Bibcode: 1987Ap&SS.139..139I. 
  • Busso, M. et al. (September 1987), "A search for non-stellar contributions to the optical and near-IR flux of RS CVn binaries. I. The cases of TY Pyx, UV Psc, RU CNC and VV Mon", Astronomy and Astrophysics 183: 83–90, Bibcode: 1987A&A...183...83B. 
  • Keskin, V. et al. (August 1987), "The 1986 Light Curves of UV Piscium", Information Bulletin on Variable Stars 3060: 1, Bibcode: 1987IBVS.3060....1K. 
  • Antonopoulou, E. (July 1987), "Infrared Photometry of UV-Piscium", Astrophysics and Space Science 135 (2): 335–345, doi:10.1007/BF00641569, Bibcode: 1987Ap&SS.135..335A. 
  • Busso, M. et al. (February 1986), "Differential rotation and activity cycles in RS CVn binaries. III. UV Piscium and UX Arietis", Astronomy and Astrophysics 156: 106–110, Bibcode: 1986A&A...156..106B. 
  • Barden, S. C. (March 1984), "The Hα Nature of the Short Period RS CVn Systems HD86590, σ2Cr B, ER Vul and UV Psc", Bulletin of the American Astronomical Society 16: 473, Bibcode: 1984BAAS...16..473B. 
  • Vivekananda Rao, P.; Sarma, B. K. (February 1984), Hidayat, Bambang; Kopal, Zdenek; Rahe, Jurgen, eds., "Photometry of the RS-Canum Type Eclipsing Binary UV-Piscium", Double Stars, Physical Properties and Generic Relations. Proceedings of IAU Colloquium No. 80, held at Lembang, Java, June 3–7, 1983 (Dordrecht, Holland; Boston: D. Reidel Publishing Company) 99 (1–2): p. 239, doi:10.1007/BF00650248, Bibcode: 1984Ap&SS..99..239V. 
  • Rao, P. V.; Sarma, M. B. K. (September 1983), "The distortion wave on the light curve of the RS CVn binary UV Piscium.", Journal of Astrophysics and Astronomy 4 (3): 161–169, doi:10.1007/BF02714902, Bibcode: 1983JApA....4..161R. 
  • Antonopoulou, E. (September 1983), "Infrared photometry of the RS CVn binaries. III. JHK light curves of UV Psc", Astronomy and Astrophysics Supplement Series 53: 347–349, Bibcode: 1983A&AS...53..347A. 
  • Zeilik, M. et al. (February 1982), "1981 UBVR Photometry of UV Psc", Information Bulletin on Variable Stars 2089: 1, Bibcode: 1982IBVS.2089....1Z. 
  • Aslan, Z. (December 1978), "Photoelectric Times of Minima and the Period of UV Psc", Information Bulletin on Variable Stars 1511: 1, Bibcode: 1978IBVS.1511....1A. 
  • Al-Naimiy, H. et al. (April 1978), "Observations of UV Psc and XY Cet", Information Bulletin on Variable Stars 1415: 1, Bibcode: 1978IBVS.1415....1A. 
  • Sadik, A. R. (January 1978), "UV Psc – a Short Period RS CVn Star", Information Bulletin on Variable Stars 1381: 1, Bibcode: 1978IBVS.1381....1S. 




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