Xi Tauri
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Taurus |
| Right ascension | Template:RA[2] |
| Declination | Template:DEC[2] |
| Apparent magnitude (V) | 3.73 - 3.81[3] |
| Characteristics | |
| Spectral type | B9Vn + B9V + B5V + F5V[4] |
| Variable type | Algol[3] |
| Astrometry | |
| Proper motion (μ) | RA: Script error: No such module "val".[2] mas/yr Dec.: Script error: No such module "val".[2] mas/yr |
| Parallax (π) | 15.60±1.04 mas[2] |
| Distance | Template:Rnd ± Template:Rnd ly (Template:Rnd ± Template:Rnd pc) |
| Orbit[5] | |
| Primary | ξ Tau Aa |
| Companion | ξ Tau Ab |
| Period (P) | Script error: No such module "val". |
| Eccentricity (e) | Script error: No such module "val". |
| Inclination (i) | Script error: No such module "val".° |
| Longitude of the node (Ω) | Script error: No such module "val".° |
| Periastron epoch (T) | JD Script error: No such module "val". |
| Argument of periastron (ω) (secondary) | Script error: No such module "val".° |
| Semi-amplitude (K1) (primary) | Script error: No such module "val". km/s |
| Orbit[5] | |
| Primary | ξ Tau Aa-Ab |
| Companion | ξ Tau B |
| Period (P) | Script error: No such module "val". |
| Semi-major axis (a) | Script error: No such module "val". |
| Eccentricity (e) | Script error: No such module "val". |
| Inclination (i) | Script error: No such module "val".° |
| Longitude of the node (Ω) | Script error: No such module "val".° |
| Periastron epoch (T) | JD Script error: No such module "val". |
| Argument of periastron (ω) (secondary) | Script error: No such module "val".° |
| Semi-amplitude (K1) (primary) | Script error: No such module "val". km/s |
| Details[5] | |
| ξ Tau Aa | |
| Mass | Script error: No such module "val". Template:Solar mass |
| Radius | Script error: No such module "val". Template:Solar radius |
| Surface gravity (log g) | 4.2 cgs |
| Temperature | Script error: No such module "val". K |
| Rotational velocity (v sin i) | Script error: No such module "val". km/s |
| ξ Tau Ab | |
| Mass | Script error: No such module "val". Template:Solar mass |
| Radius | Script error: No such module "val". Template:Solar radius |
| Surface gravity (log g) | 4.2 cgs |
| Temperature | Script error: No such module "val". K |
| Metallicity [Fe/H] | {{{metal_fe2}}} dex |
| Rotational velocity (v sin i) | Script error: No such module "val". km/s |
| ξ Tau B | |
| Mass | Script error: No such module "val". Template:Solar mass |
| Surface gravity (log g) | Script error: No such module "val". cgs |
| Temperature | Script error: No such module "val". K |
| Rotational velocity (v sin i) | Script error: No such module "val". km/s |
| Metallicity [Fe/H] | {{{metal_fe2}}} dex |
| Other designations | |
| 2 Tau, HR 1038, HD 21364, BD+09°439, HIP 16083, SAO 111195[6] | |
| Database references | |
| SIMBAD | data |
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Xi Tauri (ξ Tau, ξ Tauri) is a hierarchical quadruple system[5] in the constellation Taurus.
Xi Tauri is a spectroscopic and eclipsing quadruple star. It consists of three blue-white B-type main sequence stars and an F-type main sequence star. Two of the stars form an eclipsing binary system and revolve around each other once every 7.15 days. These in turn orbit the third star once every 145 days. The fourth star is a F star that orbits the other three stars in a roughly fifty-year period and has been resolved optically.[7] The brightest and most massive of the four stars is the "third" star, although the eclipsing pair have a greater combined mass and hence are generally considered to be the primary.[4]
The typical combined apparent magnitude of the system is +3.73, but because the stars eclipse one another during their orbits, it is classified as a variable star, and its brightness varies from magnitude +3.73 to +3.81. Xi Tauri is approximately 210 light years from Earth.[2]
Nomenclature for the four stars varies. Some sources refer to the faint resolved companion as component C, while others refer to it as B. Similarly, the inner three stars are respectively Aa, Ab, and B, or Aa, Ab, and Ac.[4][5]
References
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- ↑ a b c d e f Script error: No such module "Citation/CS1".Vizier catalog entry
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- ↑ a b c d e Script error: No such module "Citation/CS1".
- ↑ Script error: No such module "citation/CS1".
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- Pages with script errors
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- Astrometric binaries
- Eclipsing binaries
- Spectroscopic binaries
- Bayer objects
- Taurus (constellation)
- Multiple star systems
- B-type main-sequence stars
- Flamsteed objects
- Hipparcos objects
- Bright Star Catalogue objects
- Henry Draper Catalogue objects
- Durchmusterung objects