Summary
Pi2 Cygni, Latinized from π2 Cygni, is a triple star[13] system in the northern constellation of Cygnus. It is visible to the naked eye about 2.5° east-northeast of the open cluster M39,[14] having an apparent visual magnitude of 4.24.[2] Based upon an annual parallax shift of 2.95 mas,[1] it is located at a distance of roughly 1,100 light years from the Sun.
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Cygnus |
| Right ascension | 21h 46m 47.60832s[1] |
| Declination | +49° 18′ 34.4511″[1] |
| Apparent magnitude (V) | 4.24[2] |
| Characteristics | |
| Spectral type | B2.5 III[3] |
| U−B color index | −0.79[2] |
| B−V color index | −0.125[2] |
| Variable type | β Cep[4] |
| Astrometry | |
| Radial velocity (Rv) | −12.3[5] km/s |
| Proper motion (μ) | RA: +2.77[1] mas/yr Dec.: −2.00[1] mas/yr |
| Parallax (π) | 2.95 ± 0.34 mas[1] |
| Distance | approx. 1,100 ly (approx. 340 pc) |
| Absolute magnitude (MV) | −3.39[6] |
| Orbit[7] | |
| Period (P) | 72.0162 d |
| Eccentricity (e) | 0.34 |
| Periastron epoch (T) | 2428410.6 JD |
| Argument of periastron (ω) (secondary) | 238.1° |
| Semi-amplitude (K1) (primary) | 7.8 km/s |
| Details | |
| π2 Cyg A | |
| Mass | 8.4±0.4[8] M☉ |
| Radius | 7.1[9] R☉ |
| Luminosity (bolometric) | 8,442[10] L☉ |
| Surface gravity (log g) | 3.69±0.16[11] cgs |
| Temperature | 20,815±1,057[11] K |
| Metallicity [Fe/H] | 0.04±0.09[11] dex |
| Rotational velocity (v sin i) | 50±5[4] km/s |
| Age | 33.2±5.8[8] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
The inner pair of stars in this system form a single-lined[15] spectroscopic binary with an orbital period of 72.0162 days and an eccentricity of 0.34.[7] The primary, component A, is a B-type giant star with a stellar classification of B2.5 III.[3] It is a Beta Cephei variable[4] with an estimated 8.4[8] times the mass of the Sun and around 7.1[9] times the Sun's radius. The star is roughly 33[8] million years old and is spinning with a projected rotational velocity of 50[4] km/s. It is radiating 8,442[10] times the solar luminosity from its outer atmosphere at an effective temperature of around 20,815[11] K.
The third member of this system is a magnitude 5.98 star at an angular separation of 0.10 arc seconds along a position angle of 129°, as of 1996.[16]
Historical names edit
In Chinese, 螣蛇 (Téng Shé), meaning Flying Serpent, refers to an asterism consisting of π2 Cygni, α Lacertae, 4 Lacertae, π1 Cygni, HD 206267, ε Cephei, β Lacertae, σ Cassiopeiae, ρ Cassiopeiae, τ Cassiopeiae, AR Cassiopeiae, 9 Lacertae, 3 Andromedae, 7 Andromedae, 8 Andromedae, λ Andromedae, κ Andromedae, ψ Andromedae and ι Andromedae. Consequently, the Chinese name for π2 Cygni itself is 螣蛇三 (Téng Shé sān, English: the Third Star of Flying Serpent)[17]
References edit
- ^ 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.
- ^ a b c d Mermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)", Catalogue of Eggen's UBV Data, SIMBAD, Bibcode:1986EgUBV........0M.
- ^ a b Walborn, N. R. (1971), "Some Spectroscopic Characteristics of the OB Stars: An Investigation of the Space Distribution of Certain OB Stars and the Reference Frame of the Classification", The Astrophysical Journal Supplement Series, 23: 257, Bibcode:1971ApJS...23..257W, doi:10.1086/190239.
- ^ a b c d Silvester, J.; et al. (September 2009), "On the incidence of magnetic fields in slowly pulsating B, β Cephei and B-type emission-line stars", Monthly Notices of the Royal Astronomical Society, 398 (3): 1505–1511, arXiv:0906.1575, Bibcode:2009MNRAS.398.1505S, doi:10.1111/j.1365-2966.2009.15208.x, S2CID 16169939.
- ^ Wilson, Ralph Elmer (1953), "General Catalogue of Stellar Radial Velocities", Carnegie Institute Washington D.C. Publication, Washington: Carnegie Institution of Washington, Bibcode:1953GCRV..C......0W.
- ^ 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 Pourbaix, D.; et al. (2004), "SB9: The ninth catalogue of spectroscopic binary orbits", Astronomy & Astrophysics, 424 (2): 727–732, arXiv:astro-ph/0406573, Bibcode:2004A&A...424..727P, doi:10.1051/0004-6361:20041213, S2CID 119387088.
- ^ a b c d Tetzlaff, N.; et al. (January 2011), "A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun", Monthly Notices of the Royal Astronomical Society, 410 (1): 190–200, arXiv:1007.4883, Bibcode:2011MNRAS.410..190T, doi:10.1111/j.1365-2966.2010.17434.x, S2CID 118629873.
- ^ a b Pasinetti Fracassini, L. E.; et al. (February 2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS)", Astronomy and Astrophysics, 367 (3rd ed.): 521–524, arXiv:astro-ph/0012289, Bibcode:2001A&A...367..521P, doi:10.1051/0004-6361:20000451, S2CID 425754.
- ^ a b Hohle, M. M.; et al. (April 2010), "Masses and luminosities of O- and B-type stars and red supergiants", Astronomische Nachrichten, 331 (4): 349, arXiv:1003.2335, Bibcode:2010AN....331..349H, doi:10.1002/asna.200911355, S2CID 111387483.
- ^ a b c d Prugniel, Ph.; et al. (July 2011), "The atmospheric parameters and spectral interpolator for the MILES stars", Astronomy & Astrophysics, 531: A165, arXiv:1104.4952, Bibcode:2011A&A...531A.165P, doi:10.1051/0004-6361/201116769, S2CID 54940439.
- ^ "pi.02 Cyg", SIMBAD, Centre de données astronomiques de Strasbourg, retrieved 2017-02-19.
- ^ 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.
- ^ O'Meara, Stephen James (2016), Deep-Sky Companions: The Caldwell Objects (2nd ed.), Cambridge University Press, p. 92, ISBN 978-1316033531.
- ^ Abt, Helmut A.; et al. (July 2002), "Rotational Velocities of B Stars", The Astrophysical Journal, 573 (1): 359–365, Bibcode:2002ApJ...573..359A, doi:10.1086/340590.
- ^ 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.
- ^ (in Chinese) AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 7 月 7 日