R Arae

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R Arae
File:RAraLightCurve.png
A visual band light curve for R Arae, adapted from Blane et al. (2019)[1]
Observation data
Epoch J2000      Equinox J2000
Constellation Ara
Right ascension Template:RA[2]
Declination Template:DEC[2]
Apparent magnitude (V) 6.17 (- 6.20) - 7.32[3]
Characteristics
Spectral type B9Vp[4] (B5V + F1IV[5])
B−V Template:Engvar 0.10[5]
Variable type Algol[4]
Astrometry
Radial velocity (Rv)+5.5[5] km/s
Proper motion (μ) RA: Script error: No such module "val".[6] mas/yr
Dec.: Script error: No such module "val".[6] mas/yr
Parallax (π)3.3603±0.0647 mas[6]
DistanceTemplate:Rnd ± Template:Rnd ly
(Template:Rnd ± Template:Rnd pc)
Absolute magnitude (MV)Script error: No such module "val". + Script error: No such module "val".[5]
Orbit[5]
Period (P)Script error: No such module "val".
Eccentricity (e)0
Inclination (i)78.0°
Semi-amplitude (K1)
(primary)		55.3 km/s
Semi-amplitude (K2)
(secondary)		181.6 km/s
Details[5]
A
Mass5.0 Template:Solar mass
Radius3.41 Template:Solar radius
Luminosity257 Template:Solar luminosity
Surface gravity (log g)4.07 cgs
Temperature12,500 K
Rotational velocity (v sin i)202[5] km/s
B
Mass1.5 Template:Solar mass
Radius5.97 Template:Solar radius
Luminosity78 Template:Solar luminosity
Surface gravity (log g)3.07 cgs
Temperature7,000 K
Metallicity [Fe/H]{{{metal_fe2}}} dex
Rotational velocity (v sin i)73 km/s
Other designations
Template:Odlist
Database references
SIMBADdata

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R Arae is an Algol-type eclipsing binary in the constellation Ara. Located approximately Script error: No such module "convert". distant, it normally shines at magnitude 6.17, but during eclipses can fall as low as magnitude 7.32.[3] When an eclipse is not occurring, it will be faintly visible to the naked eye under ideal observing conditions.

In 1892, R Ara was discovered to be an eclipsing binary by Alexander William Roberts at Lovedale observatory in South Africa. The discovery was published in 1894.[7] Roberts referred to the star as "(5949) Arae", its designation as an unconfirmed variable star in Seth Carlo Chandler's catalog of variable stars.[8] It was listed with its modern variable star designation, R Arae, in Annie Jump Cannon's 1907 Second Catalogue of Variable Stars.[9]

It has been suggested by multiple studies that mass transfer is occurring between the two stars of this system,[10][11] and the period of eclipses seems to be increasing over time.[11] The primary is a blue-white main sequence star of spectral type B5V that is 5 times as massive as the Sun, while the secondary is a yellow-white star of spectral type F1IV that is 1.5 times as massive as the Sun. Stellar material is being stripped off the secondary and accreting on the primary.[5]

R Arae has an 8th-magnitude companion Script error: No such module "val". away.[5] The companion star is at a similar distance.[12]

References

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  1. ↑ Script error: No such module "Citation/CS1".
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  5. ↑ a b c d e f g h i Script error: No such module "Citation/CS1".
  6. ↑ a b c Template:Cite DR2
  7. ↑ Script error: No such module "Citation/CS1".
  8. ↑ Script error: No such module "Citation/CS1".
  9. ↑ Script error: No such module "Citation/CS1".
  10. ↑ Script error: No such module "Citation/CS1".
  11. ↑ a b Script error: No such module "Citation/CS1".
  12. ↑ Template:Cite DR2

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Template:Stars of Ara

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