 A light curve for TY Pyxidis, plotted from TESS data | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Pyxis |
| Right ascension | 08 59 42.72169 |
| Declination | –27° 48′ 58.6885″ |
| Apparent magnitude (V) | 6.85 - 7.5 |
| 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 mas/yr Dec.: –44.36 ± 0.42 mas/yr |
| Parallax (π) | 17.73 ± 0.52 mas |
| Distance | 184 ± 5 ly (56 ± 2 pc) |
| Details | |
| Radius | 2.2 R☉ |
| Temperature | 5400 K |
| Other designations | |
| TY Pyxidis, CD−27° 6141, HD 77137, HIP 44164, SAO 176805. | |
| Database references | |
| SIMBAD | data |
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.
The two components are both of spectral type G5IV, have a mass of 1.2 solar masses and revolve around each other every 3.2 days. Each star is around 2.2 times the diameter of the Sun.
The system is classified as either a RS Canum Venaticorum variable or a BY Draconis variable, stars that vary on account of prominent starspot activity, and lies 184 ± 5 light years away. 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.
References
- "MAST: Barbara A. Mikulski Archive for Space Telescopes". Space Telescope Science Institute. Retrieved 8 December 2021.
- ^ 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
- ^ Watson, Christopher (4 January 2010). "TY Pyxidis". The International Variable Star Index. American Association of Variable Star Observers. Retrieved 30 July 2015.
- ^ 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.
- Andersen, J.; Popper, D. M. (1975). "The G-type eclipsing binary TY Pyxidis". Astronomy and Astrophysics. 39: 131–34. Bibcode:1975A&A....39..131A.
- 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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