TY Pyxidis
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Pyxis |
| Right ascension | 08h 59m 42.72169s[1] |
| Declination | –27° 48′ 58.6885″[1] |
| Apparent magnitude (V) | 6.85 - 7.5[2] |
| 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[1] mas/yr Dec.: –44.36 ± 0.42[1] mas/yr |
| Parallax (π) | 17.73 ± 0.52[1] mas |
| Distance | 184 ± 5 ly (56 ± 2 pc) |
| Details | |
| Radius | 2.2[3] R☉ |
| Temperature | 5400[3] K |
| Other designations | |
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.[2]
The two components are both of spectral type G5IV,[3] have a mass of 1.2 solar masses and revolve around each other every 3.2 days.[4] Each star is around 2.2 times the diameter of the Sun.[3]
The system is classified as either a RS Canum Venaticorum variable[2] or a BY Draconis variable, stars that vary on account of prominent starspot activity,[3] and lies 184 ± 5 light years away.[1] 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.[5]
References
- 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 - 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.
- 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.
- ↑ 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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