TY Pyxidis

A light curve for TY Pyxidis, plotted from TESS data[1]
Observation data
Epoch J2000      Equinox J2000
Constellation Pyxis
Right ascension 08h 59m 42.72169s[2]
Declination –27° 48′ 58.6885″[2]
Apparent magnitude (V) 6.85 - 7.5[3]
Characteristics
Spectral type G5IV + G5IV
Variable type RS Canum Venaticorum variable
Astrometry
Radial velocity (Rv)+63.20 ± 1 km/s
Proper motion (μ) RA: –44.46 ± 0.34[2] mas/yr
Dec.: –44.36 ± 0.42[2] mas/yr
Parallax (π)17.73 ± 0.52 mas[2]
Distance184 ± 5 ly
(56 ± 2 pc)
Details
Radius2.2[4] R☉
Temperature5400[4] K
Other designations
TY Pyxidis, CD−27° 6141, HD 77137, HIP 44164, SAO 176805.
Database references
SIMBADdata

TY Pyxidis is an eclipsing binary star in the constellation Pyxis. The apparent magnitude ranges from 6.85 to 7.5 over 3.2 days.[3]

The two components are both of spectral type G5IV,[4] have a mass of 1.2 solar masses and revolve around each other every 3.2 days.[5] Each star is around 2.2 times the diameter of the Sun.[4]

The system is classified as either a RS Canum Venaticorum variable[3] or a BY Draconis variable, stars that vary on account of prominent starspot activity,[4] and lies 184 ± 5 light years away.[2] The system emits X-rays, and analysing the emission curve over time led Pres and colleagues to conclude that there was a loop of material arcing between the two stars.[6]

References

  1. ↑ "MAST: Barbara A. Mikulski Archive for Space Telescopes". Space Telescope Science Institute. Retrieved 8 December 2021.
  2. 1 2 3 4 5 6 van Leeuwen, F. (November 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
  3. 1 2 3 Watson, Christopher (4 January 2010). "TY Pyxidis". The International Variable Star Index. American Association of Variable Star Observers. Retrieved 30 July 2015.
  4. 1 2 3 4 5 Strassmeier, Klaus G. (2009). "Starspots". The Astronomy and Astrophysics Review. 17 (3): 251–308. Bibcode:2009A&ARv..17..251S. doi:10.1007/s00159-009-0020-6.
  5. ↑ Andersen, J.; Popper, D. M. (1975). "The G-type eclipsing binary TY Pyxidis". Astronomy and Astrophysics. 39: 131–34. Bibcode:1975A&A....39..131A.
  6. ↑ Pres, Pawel; Siarkowski, Marek; Sylwester, Janusz (1995). "Soft X-ray imaging of the TY Pyx binary system - II. Modelling the interconnecting loop-like structure". Monthly Notices of the Royal Astronomical Society. 275 (1): 43–55. Bibcode:1995MNRAS.275...43P. doi:10.1093/mnras/275.1.43.
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