Astronomy:R Apodis
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Short description: Variable star in the constellation Apus
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| 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 (R Aps) is a star in the constellation Apus.
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
- ↑ 1.0 1.1 van Leeuwen, F. (November 2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics 474 (2): 653–664. doi:10.1051/0004-6361:20078357. Bibcode: 2007A&A...474..653V.
- ↑ 2.0 2.1 2.2 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. doi:10.1086/191373. Bibcode: 1989ApJS...71..245K.
- ↑ Samus, N. N. 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.
- ↑ 5.0 5.1 5.2 5.3 5.4 5.5 5.6 5.7 5.8 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. doi:10.1051/0004-6361/201424474. Bibcode: 2015A&A...574A..50J.
- ↑ 6.0 6.1 6.2 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G. 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. doi:10.1051/0004-6361:20065105. Bibcode: 2006A&A...458..609D.
- ↑ "R Aps". The International Variable Star Index. AAVSO – American Association of Variable Star Observers. http://www.aavso.org/vsx/index.php?view=detail.top&oid=526. Retrieved 10 April 2016.
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