R Apodis

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R Apodis
Observation data
Epoch J2000.0        Equinox J2000.0 (ICRS)
Constellation Apus
Right ascension 14h 57m 52.98352s [1]
Declination −76° 39′ 45.5569″ [1]
Apparent magnitude  (V)5.36±0.01 [2]
Characteristics
Spectral type K4 III: [3]
B−V color index +1.44 [4]
Variable type constant [5]
Astrometry
Radial velocity (Rv)−31.20±0.08 [6]  km/s
Proper motion (μ)RA: −69.161  mas/yr [1]
Dec.: −16.583  mas/yr [1]
Parallax (π)7.8879 ± 0.0867  mas [1]
Distance 413 ± 5  ly
(127 ± 1  pc)
Absolute magnitude  (MV)−0.22±0.16 [7]
Details
Mass 1.10±0.18 [6]   M☉
Radius 30.1±1.5 [8]   R☉
Luminosity 293+9
−10 [1]   L☉
Surface gravity (log g)1.62 [9]   cgs
Temperature 4282±33 [10]   K
Metallicity [Fe/H]−0.29±0.05 [6]   dex
Rotational velocity (v sin i)<1.3 [11]  km/s
Age 5.68±2.42 [6]   Gyr
Other designations
18 G. Apodis [12] , R Aps, CD−76°688, CPD−76°924, FK5  3175, GC  20057, HD  131109, HIP  73223, HR  5540, SAO  257212
Database references
SIMBAD data

R Apodis (HD 131109; HR 5540; 18 G. Apodis) is a solitary star [13] in the constellation Apus. It is faintly visible to the naked eye as an orange-hued point of light with an apparent magnitude of 5.36. [2] Gaia DR3 parallax measurements imply a distance of 413 light-years [1] and it is drifting closer with a heliocentric radial velocity of −31.2  km/s . [6] At its current distance, R Apodis' brightness is diminished by an interstellar extinction of 0.26 magnitudes [14] and it has an absolute magnitude of −0.22. [7]

HD 131109 was the first star observed to be variable in the constellation; It was first discovered in 1873 by Benjamin Apthorp Gould. Later, it was hastily given the variable star designation R Apodis in a 1907 variable star catalogue despite it being a suspected variable star at the time. [15] However, observations conducted in a 1952 field star survey revealed that R Apodis was not variable at all. [16] Keenan & Pitts (1980) found that it varied between magnitudes 5.5 and 6.1, but this was never confirmed. [17] Hipparcos photometric data revealed that R Apodis indeed had a constant brightness. [18] It has since been listed as a class CST: in the General Catalog of Variable Stars. [5]

R Apodis has a stellar classification of K4 III:, [3] indicating that it is an evolved K-type giant that has ceased hydrogen fusion at its core and left the main sequence. However, there is uncertainty about the luminosity class. It has a comparable mass to the Sun but at the age of 5.68 billion years, [6] it has expanded to 30.1 times the radius of the Sun. [8] It radiates 293 times the luminosity of the Sun [1] from its enlarged photosphere at an effective temperature of 4,282  K . [10] R Apodis is metal deficient with an iron abundance roughly half of the Sun's [6] and it spins slowly with a projected rotational velocity lower than 1.3  km/s . [11]

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References

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  4. ↑ Cousins, A. W. J. (1977). "Cape UBV magnitudes and colours of South circumpolar stars". South African Astronomical Observatory Circulars. 1: 51. Bibcode:1977SAAOC...1...51C.
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  15. ↑ Cannon, Annie J. (1907). "Second catalogue of variable stars". Annals of Harvard College Observatory. 55: 1–94. Bibcode:1907AnHar..55....1C. S2CID   116966328.
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