AH Scorpii
| Observation data Epoch J2000 Equinox J2000 |
|
|---|---|
| Constellation | Scorpius |
| Right ascension | 17h 11m 17.02114s[1] |
| Declination | −32° 19′ 30.7132″[1] |
| Apparent magnitude (V) | 6.5 - 9.6[2] |
| Characteristics | |
| Spectral type | M4-5 Ia-Iab[3] |
| B−V color index | +2.57[4] |
| Variable type | SRc[3] |
| Astrometry | |
| Radial velocity (Rv) | −13.40 ± 2.4[5] km/s |
| Proper motion (μ) | RA: −1.37[1] mas/yr Dec.: −2.37[1] mas/yr |
| Parallax (π) | −0.09 ± 0.57[1] mas |
| Distance | 7,400 ly (2,260[6] pc) |
| Absolute magnitude (MV) | −5.8[7] |
| Details | |
| Radius | 1,411 ± 124[4] R☉ |
| Luminosity | 330,000[4] L☉ |
| Temperature | 3,682 ± 190[4] K |
| Other designations | |
| Database references | |
| SIMBAD | data |
AH Scorpii is a red supergiant variable star located in the constellation Scorpius. It is one of the largest stars known stars at 1,411 R☉.
AH Sco is a semiregular variable star with a main period of 714 days. The total visual magnitude range is 6.5 - 9.6.[2] No long secondary periods have been detected.[8]
Modelling of AH Sco near maximum light has determined an effective temperature of 3,682 K and a luminosity of 330,000 L☉, giving a radius of 1,411 R☉.[4]
AH Sco is a dust-enshrouded red supergiant[9] with SiO, H2O, and OH masers in its oxygen-rich circumstellar material. VLBI measurements of the masers have provided an accurate distance of 2,260 parsecs. The masers were observed to be approaching the star at 13 km/s, indicating overall contraction at around phase 0.55 of the visual variations.[6]
See also
References
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