R Apodis
R Apodis (R Aps) is a star in the constellation Apus.
| 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[6] mas |
| Distance | 386 ± 7 ly (118 ± 2 pc) |
| Absolute magnitude (MV) | −0.22 ± 0.16[7] |
| Details | |
| Mass | 1.10 ± 0.18[5] M☉ |
| Radius | 22.94 ± 1.65[5] R☉ |
| Luminosity | 229+59 −47[5] L☉ |
| Surface gravity (log g) | 1.99 ± 0.05[5] cgs |
| Temperature | 4318 ± 38[5] K |
| Metallicity [Fe/H] | −0.29 ± 0.05[5] dex |
| Rotational velocity (v sin i) | 2.64[5] km/s |
| Age | 5.68 ± 2.42[5] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
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
- 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.
- Hoffleit, Dorrit; Jaschek, Carlos (1991). The Bright star catalogue. Bibcode:1991bsc..book.....H.
- 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.
- 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.
- 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.
- 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.
- 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.
- "R Aps". The International Variable Star Index. AAVSO – American Association of Variable Star Observers. Retrieved 10 April 2016.
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