Iota Auriga ( ι Aur, ι Aurigae ) - an orange bright giant in the constellation Auriga . Has the historical name Al Qab , abbreviated from Kabdilinan (sometimes Kadhilinan ) comes from the Arabic الكعب ذي العنان - the ankle of the charioteer . It is also called Hassaleh , a name given by the Czech astronomer Antonín Bečvář in the atlas of 1951, but what it means is unknown.
| Al kab | |||
|---|---|---|---|
| Star | |||
| Observational data ( Age J2000.0) | |||
| Right ascension | |||
| Declination | |||
| Distance | ~ 510 St. years (~ 160 pc ) | ||
| Visible magnitude ( V ) | from +2.63 to +2.78 | ||
| Constellation | Auriga | ||
| Astrometry | |||
| Radial velocity ( R v ) | +17.5 km / s | ||
| Own movement (μ) | RA: +3.63 mas per year Dec: -18.54 mas per year | ||
| Parallax (π) | 6.37 ± 0.96 mas | ||
| Absolute magnitude (V) | from -3.35 to -3.20 | ||
| Specifications | |||
| Spectral class | K3II | ||
| Color Index ( B - V ) | 1.53 | ||
| Color Index ( U - B ) | 1.78 | ||
| Variability | is possible | ||
| physical characteristics | |||
| Weight | 7-9 M ☉ | ||
| Radius | 106-128 R ☉ | ||
| Age | 30-45 million years | ||
| Temperature | 4390 K | ||
| Luminosity | 5400 L ☉ | ||
| Rotation | <17 km / s (2.7 days) | ||
| |||
| Database Information | |||
| SIMBAD | data | ||
Al Qab has an average magnitude of +2.69 m , which is weakened by 0.6 m due to interstellar dust.
Al Qab entered the final stages of stellar evolution : carbon in its core has already begun to be synthesized from helium . Al Kab began his life 30-45 million years ago as a bright giant of spectral class B. With a mass of 7 to 9 solar , Al Kab could well end his life as a supernova . If the mass is still not enough, then it will become a massive white dwarf .
Al Qab is also one of the most powerful x-ray sources , thanks to its hot corona like that. what surrounds the sun [1] .
Notes
- ↑ Al Kab (Stars, Jim Kaler )