S Antliae
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Antlia[2] |
| Right ascension | Template:RA[3] |
| Declination | Template:DEC[3] |
| Apparent magnitude (V) | 6.27 to 6.83[4] |
| Characteristics | |
| Spectral type | A9V |
| B−V Template:Engvar | 0.33 |
| Variable type | Eclipsing binary W UMa type |
| Astrometry | |
| Proper motion (μ) | RA: Script error: No such module "val". mas/yr[3] Dec.: +Script error: No such module "val". mas/yr[3] |
| Parallax (π) | 12.6116±0.0203 mas[3] |
| Distance | Template:Rnd ± Template:Rnd ly (Template:Rnd ± Template:Rnd pc) |
| Absolute magnitude (MV) | 1.963[5] (2.25 + 3.42)[6] |
| Orbit[7] | |
| Period (P) | Script error: No such module "val". days |
| Semi-major axis (a) | Script error: No such module "val". |
| Inclination (i) | Script error: No such module "val".° |
| Semi-amplitude (K1) (primary) | Script error: No such module "val". km/s |
| Semi-amplitude (K2) (secondary) | Script error: No such module "val". km/s |
| Details[6] | |
| A | |
| Mass | Script error: No such module "val". Template:Solar mass |
| Radius | Script error: No such module "val". Template:Solar radius |
| Luminosity | Script error: No such module "val". Template:Solar luminosity |
| Surface gravity (log g) | Script error: No such module "val". cgs |
| Temperature | Script error: No such module "val". K |
| B | |
| Mass | Script error: No such module "val". Template:Solar mass |
| Radius | Script error: No such module "val". Template:Solar radius |
| Luminosity | Script error: No such module "val". Template:Solar luminosity |
| Temperature | Script error: No such module "val". K |
| Metallicity [Fe/H] | {{{metal_fe2}}} dex |
| Age | 1.9[7] Gyr |
| Other designations | |
| CD-28°7373, HD 82610, SAO 177619, HIP 46810, HR 3798. | |
| Database references | |
| SIMBAD | data |
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S Antliae is a W Ursae Majoris-type eclipsing binary star in Antlia.
Characteristics
S Antiliae is classed as an A-type W Ursae Majoris variable, since the primary is hotter than the secondary and the drop in magnitude is caused by the latter passing in front of the former. S Antiliae varies in apparent magnitude from 6.27 to 6.83 over a period of 15.6 hours.[4] The system shines with a combined spectrum of A9V.Script error: No such module "Unsubst".
The system's orbital period is about 0.591 days. The stars' centres are an average of 3.82 times the Sun's radius apart. The system will evolve into an Algol variable.[6]
Calculating the properties of the component stars indicates that the primary star has a mass 1.66 times and a diameter 2.09 times that of the Sun, and the secondary has a mass 0.55 times and a diameter 1.31 times that of the Sun. The primary has a surface temperature of 7,100Script error: No such module "String".K, while the secondary is a little cooler at 6,859Script error: No such module "String".K.[6] The two stars have similar luminosity and spectral type as they have a common envelope and share stellar material.Script error: No such module "Unsubst". The system is thought to be around two billion years old.[7]
Based upon an annual parallax shift of 12.6116 milliarc seconds as measured by the Gaia satellite,[3] this system is Script error: No such module "convert". from Earth. Analysing and recalibrating yields a parallax of 13.30 and hence a distance of Script error: No such module "convert"..[5]
History
The star's variability was first recorded in 1888 by H.M. Paul,[8] when it had the shortest known period of any variable star. It was initially thought to be an Algol-type eclipsing binary, but this was discounted by E.C. Pickering on account of it lacking a shallow minimum in its maximum and the width of its minimum period. Alfred H. Joy noted the similarity of its light curve to W Ursae Majoris in 1926, concluding the system was indeed an eclipsing binary with two stars of spectral type A8.[9]
References
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