36 Andromedae is a visual binary star[4][9] system in the northern constellation of Andromeda. The designation is from the star catalogue of English astronomer John Flamsteed, first published in 1712. It is faintly visible to the naked eye with an apparent visual magnitude of 5.45.[2] An annual parallax shift of 26.33 mas yields a distance estimate of about 124 light years. The system is moving closer to the Sun with a radial velocity of −0.8 km/s.[6]
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Andromeda |
| Right ascension | 00h 54m 58.10609s[1] |
| Declination | +23° 37′ 41.9799″[1] |
| Apparent magnitude (V) | 5.45[2] (6.12 + 6.54)[3] |
| Characteristics | |
| Spectral type | G8 IV + K3 IV[4] |
| B−V color index | 1.012±0.010[5] |
| Astrometry | |
| Radial velocity (Rv) | −0.84±0.12[6] km/s |
| Proper motion (μ) | RA: 135.43±1.00[1] mas/yr Dec.: −48.61±0.48[1] mas/yr |
| Parallax (π) | 26.33 ± 0.65 mas[1] |
| Distance | 124 ± 3 ly (38.0 ± 0.9 pc) |
| Absolute magnitude (MV) | 2.56[5] |
| Orbit[7] | |
| Period (P) | 61183±69 d |
| Semi-major axis (a) | 0.9837±0.0011″ |
| Eccentricity (e) | 0.30603±0.00078 |
| Inclination (i) | 44.57±0.11° |
| Longitude of the node (Ω) | 173.66±0.13° |
| Periastron epoch (T) | 35543 ± 21 |
| Argument of periastron (ω) (secondary) | 358.62±0.21° |
| Details | |
| Luminosity | 11.57[5] L☉ |
| Other designations | |
| Database references | |
| SIMBAD | data |
The binary nature of this system was discovered in 1832 by the German-Russian astronomer Wilhelm von Struve.[4] It is a wide binary with an orbital period of 167.5 years and an eccentricity of 0.3.[7] As of 2016, the pair had an angular separation of 0.90 arc seconds along a position angle of 330°.[3]
The primary, component A, is a magnitude 6.12[3] F-type star with a stellar classification of G8 IV,[4] while the secondary, component B, has a magnitude of 6.54[3] and is a K-type star of class K3 IV.[4] Their brightness compared to their temperatures indicate they are evolving subgiant stars. However, at least one of the components is subject to flare activity, which may suggest they are instead pre-main sequence stars.[4]
References
edit- ^ a b c d e 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 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, Bibcode:2002yCat.2237....0D.
- ^ a b c d Mason, B. D.; et al. (2014), "The Washington Visual Double Star Catalog", The Astronomical Journal, 122 (6): 3466–3471, Bibcode:2001AJ....122.3466M, doi:10.1086/323920
- ^ a b c d e f Tamazian, V. S.; et al. (November 2000), "Spectral, photometric and speckle observations of visual binary WDS 00550+2338", Astronomy and Astrophysics, 363: 1019−1025, Bibcode:2000A&A...363.1019T.
- ^ a b c Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv:1108.4971, Bibcode:2012AstL...38..331A, doi:10.1134/S1063773712050015, S2CID 119257644.
- ^ a b Famaey, B.; et al. (2005). "Local kinematics of K and M giants from CORAVEL/Hipparcos/Tycho-2 data. Revisiting the concept of superclusters". Astronomy and Astrophysics. 430: 165–186. arXiv:astro-ph/0409579. Bibcode:2005A&A...430..165F. doi:10.1051/0004-6361:20041272. S2CID 17804304.
- ^ a b Hartkopf, W. I.; et al. (June 30, 2006), Sixth Catalog of Orbits of Visual Binary Stars, United States Naval Observatory, archived from the original on 2017-08-01, retrieved 2017-06-02.
- ^ "36 And". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-02-02.
- ^ Muterspaugh, Matthew W.; et al. (2010). "The Phases Differential Astrometry Data Archive. II. Updated Binary Star Orbits and a Long Period Eclipsing Binary". The Astronomical Journal. 140 (6): 1623–1630. arXiv:1010.4043. Bibcode:2010AJ....140.1623M. doi:10.1088/0004-6256/140/6/1623. S2CID 6030289.