Zeta Andromeda ( ζ And) - a multiple system in the constellation Andromeda .
| Zeta Andromeda | |||
|---|---|---|---|
| Star | |||
 | |||
| Observational data ( Age J2000.0 ) | |||
| Right ascension | |||
| Declination | |||
| Distance | 181 ± 8 St. year (56 ± 3 pc ) | ||
| Visible magnitude ( V ) | from +3.92 to +4.14 | ||
| Constellation | Andromeda | ||
| Astrometry | |||
| Radial velocity ( R v ) | -23.7 ± 0.9 km / s | ||
| Own movement (μ) | RA: -101.23 mas per year Dec: -81.89 mas per year | ||
| Parallax (π) | 17.98 ± 0.83 mas | ||
| Absolute magnitude (V) | +0.3 | ||
| Specifications | |||
| Spectral class | K1IIe | ||
| Color Index ( B - V ) | +1.12 | ||
| Color Index ( U - B ) | +0.90 | ||
| Variability | EB (β Lyr) / RS CVn | ||
| physical characteristics | |||
| Radius | 8.30 R ☉ | ||
| Temperature | |||
| Rotation | 40 km / s | ||
| |||
| Database Information | |||
| SIMBAD | data | ||
Zeta Andromeda is an eclipsing spectrally binary star . The main component is an orange bright giant of spectral class K, having a visible magnitude of +4.08 m . Due to the fact that the system is also either a variable of type RS Hounds or a variable of type β Lyra, due to rotation and mutual eclipses, the magnitude varies from +3.92 m to +4.14 m with a period of 17.77 days. Located at a distance of 181 light years from the Sun. [3]
Components
The system also has several partners. Companion B also has its own motion as the main component A. Companions C and D can be optically binary .
| Component | Right ascension | Declination | The angular distance from the main component | Angular position relative to the main component | Magnitude | Link |
|---|---|---|---|---|---|---|
| B | 00 h 47 m 20.2 s | + 24 ° 16 ′ 33 ″ | 32.6 " | 0 " | 15.3 m | Simbad |
| C | 00 h 47 m 15.2 s | + 24 ° 15 ′ 03 ″ | 97.0 " | 231 " | 13.6 m | Simbad |
| D | 00 h 47 m 08.9990 s | + 24 ° 15 ′ 33.584 ″ | 155.5 " | 260 " | 10.80 m | Simbad |
Notes
- ↑ 1 2 3 4 Gaia Data Release 2 - 2018.
- ↑ R. Earle Luck PARAMETERS AND ABUNDANCES IN LUMINOUS STARS // Astron. J. / J. G. III - IOP Publishing , 2014 .-- Vol. 147, Iss. 6. - P. 137. - ISSN 0004-6256 ; 1538-3881 - doi: 10.1088 / 0004-6256 / 147/6/137
- ↑ zet And - Eclipsing binary of beta Lyr type , database entry, SIMBAD . Accessed on line August 29, 2008.