4 Andromedae, abbreviated 4 And, is a single[8] star in the northern constellation of Andromeda. 4 Andromedae is the Flamsteed designation. It is dimly visible to the naked eye with an apparent visual magnitude of 5.308.[2] Based upon an annual parallax shift of 9.16 mas[1] as seen from Earth's orbit, it is located 356 light years away. At this distance, interstellar extinction diminishes the apparent magnitude of 4 And by 0.5326 magnitudes.[1] The star is moving closer with a heliocentric radial velocity of −11 km/s.[9] It has a magnitude 11.7 visual companion at an angular separation of 51.10″ along a position angle of 348°, as of 2002.[10]
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Andromeda |
| Right ascension | 23h 07m 39.2672s[1] |
| Declination | +46° 23′ 14.0302″[1] |
| Apparent magnitude (V) | 5.308[2] |
| Characteristics | |
| Evolutionary stage | Giant star |
| Spectral type | K5 III[3] |
| B−V color index | 1.436[2] |
| Astrometry | |
| Radial velocity (Rv) | −11.89±0.12[1] km/s |
| Proper motion (μ) | RA: −12.734 mas/yr[1] Dec.: −30.026 mas/yr[1] |
| Parallax (π) | 9.155 ± 0.0779 mas[1] |
| Distance | 356 ± 3 ly (109.2 ± 0.9 pc)[1] |
| Details | |
| Mass | 1.58±0.44[4] M☉ |
| Radius | 23.36±0.59[5] R☉ |
| Luminosity | 170[6] L☉ |
| Surface gravity (log g) | 1.91[2] cgs |
| Temperature | 4,275±92[4] K |
| Metallicity [Fe/H] | 1.98±0.11[4] dex |
| Age | 2.24+0.78 −0.58[4] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
At the age of 2.2[4] billion years, this is an aging giant star with a stellar classification of K5 III,[3] having consumed the hydrogen at its core and evolved away from the main sequence. It has 1.6[4] times the mass of the Sun and has expanded to 23[5] times the Sun's radius. The star is radiating 170[6] times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,275 K.[4]
References
edit- ^ a b c d e f g h Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
- ^ a b c d Soubiran, Caroline; et al. (2016), "The PASTEL catalogue: 2016 version", Astronomy & Astrophysics, 591: A118, arXiv:1605.07384, Bibcode:2016A&A...591A.118S, doi:10.1051/0004-6361/201628497, S2CID 119258214.
- ^ a b Eggen, O. J. (1962), "Space-velocity vectors for 3483 stars with proper motion and radial velocity", Royal Observatory Bulletin, 51: 79, Bibcode:1962RGOB...51...79E.
- ^ a b c d e f g Feuillet, Diane K.; et al. (2016), "Determining Ages of APOGEE Giants with Known Distances", The Astrophysical Journal, 817 (1): 40, arXiv:1511.04088, Bibcode:2016ApJ...817...40F, doi:10.3847/0004-637X/817/1/40, S2CID 118675933.
- ^ a b Baines, Ellyn K.; Thomas Armstrong, J.; Clark, James H.; Gorney, Jim; Hutter, Donald J.; Jorgensen, Anders M.; Kyte, Casey; Mozurkewich, David; Nisley, Ishara; Sanborn, Jason; Schmitt, Henrique R.; Van Belle, Gerard T. (2021). "Angular Diameters and Fundamental Parameters of Forty-four Stars from the Navy Precision Optical Interferometer". The Astronomical Journal. 162 (5): 198. arXiv:2211.09030. Bibcode:2021AJ....162..198B. doi:10.3847/1538-3881/ac2431.
- ^ a b 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.
- ^ "4 And". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved September 12, 2018.
- ^ Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869–879, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x, S2CID 14878976.
- ^ Gontcharov, G. A. (2006), "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system", Astronomy Letters, 32 (11): 759–771, arXiv:1606.08053, Bibcode:2006AstL...32..759G, doi:10.1134/S1063773706110065, S2CID 119231169.
- ^ Mason, B. D.; et al. (2014), "The Washington Visual Double Star Catalog", The Astronomical Journal, 122 (6): 3466, Bibcode:2001AJ....122.3466M, doi:10.1086/323920, retrieved 2015-07-22.