| |
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Telescopium |
| Right ascension | 19h38m 35.816s[2] |
| Declination | −46° 12′ 57.11″[2] |
| Characteristics | |
| Spectral type | M4.5±0.5[3] |
| Variable type | AM Her[4] |
| Astrometry | |
| Radial velocity (Rv) | 110 km/s |
| Proper motion (μ) | RA: +35.150 mas/yr[2] Dec.: −25.496 mas/yr[2] |
| Parallax (π) | 5.3378 ± 0.0834 mas[2] |
| Distance | 611 ± 10 ly (187 ± 3 pc) |
| Orbit[5] | |
| Period (P) | 2.33 h |
| Eccentricity (e) | 0.0 |
| Details | |
| White Dwarf | |
| Mass | 0.71[6] M☉ |
| Temperature | 17,500[6] K |
| Other designations | |
| Database references | |
| SIMBAD | data |
QS Telescopii is a faint, well-studied[4] binary star system in the southern constellation Telescopium.[7] It is composed of a white dwarf and main sequence donor star, locked into a close, circular orbit facing one another. Known as polars, material from the donor star does not form an accretion disk around the white dwarf, but rather streams directly onto it.[6] This is due to the presence of the white dwarf's strong magnetic field. The pair undergo frequent shifts between a high and low accretion states, and it shifts between single and double accretion poles. The main pole is partially self-eclipsing.[4]
The pair orbit each other with a period of 2.33[5] hours in a circular orbit. The donor star is a small red dwarf with an estimated stellar classification of M4−5.[3] The white dwarf primary has 71% of the mass of the Sun and an effective temperature of 17,500 K.[6] It has a magnetic field strength of 50–80 MG. The system is a source for X-ray emission.[4]
