S Arae (S Ara) is an RR Lyrae-type pulsating variable star in the constellation of Ara.[2] It has an apparent visual magnitude which varies between 9.92 and 11.24 during its 10.85-hour pulsation period,[1][3] and it exhibits the Blazhko effect.[6]
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Ara |
| Right ascension | 17h 59m 10.7311s[2] |
| Declination | −49° 26′ 00.453″[2] |
| Apparent magnitude (V) | 9.92 to 11.24[3] |
| Characteristics | |
| Spectral type | A3 II[4] |
| B−V color index | 0.9[2] |
| Variable type | RRab[3] |
| Astrometry | |
| Radial velocity (Rv) | 185 ± 655.35[2] km/s |
| Proper motion (μ) | RA: −26.24[2] mas/yr Dec.: −8.44[2] mas/yr |
| Parallax (π) | 1.1191 ± 0.0431 mas[5] |
| Distance | 2,900 ± 100 ly (890 ± 30 pc) |
| Absolute magnitude (MV) | +0.78 – +0.93[6] |
| Details | |
| Mass | 0.51 – 0.62[6] M☉ |
| Radius | 3.01[5] R☉ |
| Luminosity | 27[5] L☉ |
| Surface gravity (log g) | +2.9[6] cgs |
| Temperature | 6,563[5] K |
| Metallicity [Fe/H] | −0.90[6] dex |
| Other designations | |
| Database references | |
| SIMBAD | data |
