Rho Cygni
Rho Cygni, Latinized from ρ Cygni, is a yellow-hued star in the northern constellation of Cygnus. It is visible to the naked eye with an apparent magnitude of 4.02.[2] The measured annual parallax shift is 26.39 milliarcseconds,[1] which yields a distance estimate of 124 light years. It is moving further from the Sun with a radial velocity of +6.88.[4] The star is a member of the thin disk population of the Milky Way galaxy.[7]
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Cygnus |
| Right ascension | 21h 33m 58.85298s[1] |
| Declination | 45° 35′ 30.6179″[1] |
| Apparent magnitude (V) | 4.02 [2] |
| Characteristics | |
| Spectral type | G8 III Fe-0.5[3] |
| U−B color index | +0.56[2] |
| B−V color index | +0.89[2] |
| Astrometry | |
| Radial velocity (Rv) | +6.88[4] km/s |
| Proper motion (μ) | RA: −23.79[1] mas/yr Dec.: −93.70[1] mas/yr |
| Parallax (π) | 26.39 ± 0.15 mas[1] |
| Distance | 123.6 ± 0.7 ly (37.9 ± 0.2 pc) |
| Absolute magnitude (MV) | 1.11[5] |
| Details | |
| Mass | 2.16[6] M☉ |
| Radius | 7.81[6] R☉ |
| Luminosity | 37.1[6] L☉ |
| Temperature | 5,100[6] K |
| Metallicity [Fe/H] | −0.05[7] dex |
| Rotational velocity (v sin i) | 0.71[7] km/s |
| Age | 660[7] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
This is an evolved giant star of type G with an estimated age of 660[7] million years and a stellar classification of G8 III Fe-0.5.[3] The suffix notation indicates the spectrum shows a mild underabundance of iron in the outer atmosphere. It has about 2.16 times the mass of the Sun and 7.81 times the Sun's girth.[6] The star is radiating 37 times the Sun's luminosity from its enlarged photosphere at an effective temperature of 5,100 K.[6]
Rho Cygni is a bright X-ray source with a luminosity of 10.26×1029 ergs s−1.[8] It has a maximum magnetic field strength of 7.3±0.5 G[9] at the surface.
References
- ^ a b c d e f van Leeuwen, F. (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. Vizier catalog entry
- ^ a b c d Ducati, J. R. (2002). "VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system". CDS/ADC Collection of Electronic Catalogues. 2237: 0. Bibcode:2002yCat.2237....0D.
- ^ a b 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.
- ^ a b Soubiran, C.; et al. (March 2008), "Vertical distribution of Galactic disk stars. IV. AMR and AVR from clump giants", Astronomy and Astrophysics, 480 (1): 91–101, arXiv:0712.1370, Bibcode:2008A&A...480...91S, doi:10.1051/0004-6361:20078788, S2CID 16602121
- ^ Da Silva, Ronaldo; et al. (August 2015). "Homogeneous abundance analysis of FGK dwarf, subgiant, and giant stars with and without giant planets". Astronomy and Astrophysics. 580A: 24–42. arXiv:1505.01726. Bibcode:2015A&A...580A..24D. doi:10.1051/0004-6361/201525770. S2CID 119216425. Vizier catalog entry
- ^ a b c d e f Reffert, Sabine; et al. (2015). "Precise radial velocities of giant stars. VII. Occurrence rate of giant extrasolar planets as a function of mass and metallicity". Astronomy and Astrophysics. 574A (2): 116–129. arXiv:1412.4634. Bibcode:2015A&A...574A.116R. doi:10.1051/0004-6361/201322360. hdl:10722/215277. S2CID 59334290. Vizier catalog entry
- ^ a b c d e Jofré, E.; et al. (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.
- ^ Makarov, Valeri V. (October 2003), "The 100 Brightest X-Ray Stars within 50 Parsecs of the Sun", The Astronomical Journal, 126 (4): 1996–2008, Bibcode:2003AJ....126.1996M, doi:10.1086/378164.
- ^ Aurière, M.; et al. (February 2015), "The magnetic fields at the surface of active single G-K giants", Astronomy & Astrophysics, 574: 30, arXiv:1411.6230, Bibcode:2015A&A...574A..90A, doi:10.1051/0004-6361/201424579, S2CID 118504829, A90.