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R Apodis (R Aps) is a star in the constellation Apus.

R Apodis
Observation data
Epoch J2000      Equinox J2000
Constellation Apus
Right ascension 14h 57m 52.98366s[1]
Declination −76° 39′ 45.5556″[1]
Apparent magnitude (V) 5.34[2]
Characteristics
Spectral type K4 III:[3]
U−B color index 1.70[2]
B−V color index 1.45[2]
Variable type constant[4]
Astrometry
Radial velocity (Rv)-31.2[5] km/s
Proper motion (μ) RA: −68.997[6] mas/yr
Dec.: −16.232[6] mas/yr
Parallax (π)8.4408 ± 0.1632 mas[6]
Distance386 ± 7 ly
(118 ± 2 pc)
Absolute magnitude (MV)−0.22 ± 0.16[7]
Details
Mass1.10 ± 0.18[5] M☉
Radius22.94 ± 1.65[5] R☉
Luminosity229+59
−47[5] L☉
Surface gravity (log g)1.99 ± 0.05[5] cgs
Temperature4318 ± 38[5] K
Metallicity [Fe/H]−0.29 ± 0.05[5] dex
Rotational velocity (v sin i)2.64[5] km/s
Age5.68 ± 2.42[5] Gyr
Other designations
HR 5540, HD 131109, HIP 73223, SAO 257212, CD-76°688, CPD-76°924, IRAS 14520-7627, GSC 09428-02897, 2MASS J14575300-7639454, TYC 9428-2897-1, AAVSO 1446-76, FK5 3175, PLX 3358, GC 20057, PPM 372479, GCRV 8654
Database references
SIMBADdata

R Apodis is an orange K-type giant with an apparent magnitude of +5.34. It is approximately 386 light years from Earth. It was earlier suspected to be a variable star and given the variable star designation R Apodis. Now it is confirmed as a non-variable.[8]

R Apodis has exhausted its core hydrogen fuel and left the main sequence. It has a mass 10% higher than the Sun's, and it has cooled to 4,318 K and expanded to 23 times the radius of the Sun. Despite being cooler than the sun, its large size means it emits 229 times more electromagnetic radiation.


References


  1. van Leeuwen, F. (November 2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. S2CID 18759600.
  2. Hoffleit, Dorrit; Jaschek, Carlos (1991). The Bright star catalogue. Bibcode:1991bsc..book.....H.
  3. Keenan, Philip C; McNeil, Raymond C (1989). "The Perkins catalog of revised MK types for the cooler stars". Astrophysical Journal Supplement Series. 71: 245. Bibcode:1989ApJS...71..245K. doi:10.1086/191373.
  4. Samus, N. N.; Durlevich, O. V.; et al. (2009). "VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)". VizieR On-line Data Catalog: B/GCVS. Originally Published in: 2009yCat....102025S. 1: B/gcvs. Bibcode:2009yCat....102025S.
  5. Jofré, E; Petrucci, R; Saffe, C; Saker, L; de la Villarmois, E. Artur; Chavero, C; Gómez, M; Mauas, P. J. D (2015). "Stellar parameters and chemical abundances of 223 evolved stars with and without planets". Astronomy & Astrophysics. 574: A50. arXiv:1410.6422. Bibcode:2015A&A...574A..50J. doi:10.1051/0004-6361/201424474. S2CID 53666931.
  6. Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  7. da Silva, L.; et al. (November 2006). "Basic physical parameters of a selected sample of evolved stars". Astronomy and Astrophysics. 458 (2): 609–623. arXiv:astro-ph/0608160. Bibcode:2006A&A...458..609D. doi:10.1051/0004-6361:20065105. S2CID 9341088.
  8. "R Aps". The International Variable Star Index. AAVSO – American Association of Variable Star Observers. Retrieved 10 April 2016.

На других языках

- [en] R Apodis

[es] R Apodis

R Apodis (R Aps / HD 131109 / HR 5540 / HIP 73223)[1][2] es una estrella de la constelación de Apus, el ave del paraíso, de magnitud aparente +5,38. A pesar de llevar la denominación de estrellas variables «R» —indicando que fue la primera variable descubierta en la constelación—, observaciones posteriores han descartado dicha variabilidad. Se encuentra a 374 años luz de distancia del Sistema Solar.


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