Libra Delta (δ Lib) is a multiple system in the constellation Libra . It has the historical name Zuben Elakribi [1] [2] .
| Libra Delta | |||
|---|---|---|---|
| Star | |||
| Observational data ( Epoch J2000.0) | |||
| Right ascension | |||
| Declination | |||
| Distance | 304 of sv. years (93.28 pc ) | ||
| Visible magnitude ( V ) | V max = +4.91 m , V min = +5.90 m , P = 2.32735 days. d | ||
| Constellation | Libra | ||
| Astrometry | |||
| Radial velocity ( R v ) | −38.7 km / s | ||
| Proper motion (μ) | RA: −66.20 mas per year Dec: −3.40 mas per year | ||
| Parallax (π) | 10.72 ± 0.91 mas | ||
| Absolute magnitude (V) | V max = +0.06 m , V min = +1.05 m , P = 2.32735 days. d | ||
| Specifications | |||
| Spectral class | A0V / K0IV / G9V | ||
| Color Indicator ( B - V ) | 0.00 | ||
| Color Index ( U - B ) | -0.10 | ||
| Variability | EA | ||
| physical characteristics | |||
| Weight | 2.7 / 2.1 / 0.95 M ☉ | ||
| Radius | 3.44 / 3.6 / R ☉ | ||
| Rotation | 75 km / s (2.3 days) | ||
| |||
| Information in databases | |||
| SIMBAD | data | ||
Zuben Elakribi is an eclipse variable of the Algol type . According to the catalog of eclipsing stars [3], the primary component is a hot white star of spectral class A0, and the secondary component is an orange subgiant . The centers of the stars are divided by an average distance of 8.6 million km, and the orbital period is 2.33 days.
In 2001, evidence appeared [4] that there is a third long-period companion in the system, approximately solar mass and spectral class G9 with a circulation period of 2.762 years. In 2006, the existence of the component was confirmed at a distance of approximately 4 a. e. [5] .
Notes
- ↑ Zuben Elakribi at constellationsofwords.com (English)
- ↑ Richard Hinckley Allen. Zubenhakrabi // Star Names - Their Lore and Meaning . - 1899. (eng.)
- ↑ [ http://arxiv.org/abs/0907.5172 P. Zasche, M. Wolf, W. Hartkopf, P. Svoboda, R. Uhlar, A. Lyakos, C. eclipsing components (eng.)
- ↑ Worek, Thaddeus F. The Third Star Orbiting the Eclipsing Binary δ Librae (English)
- ↑ Bakış, V .; Budding, E .; Erdem, A .; Bakış, H .; Demircan, O .; Hadrava, P. Analysis of δ Librae including Hipparcos astrometry (eng.)