The primary, component A, is a first-ascent red giant with a stellar classification of K0 IIIb, having chemical abundances that match a first dredge-up mixing model. Pourbaix & Boffin (2003) estimated the mass of the primary as 1.7±0.4 M☉ and the secondary as 0.76±0.11 M☉.[3] However, Feuillet et al. (2016) derived a much lower mass estimate of 0.83±0.22 M☉ for the primary.[7] At the age of roughly five[7] billion years, the star has expanded to 7 times the radius of the Sun.[8] It is radiating 24[8] times the Sun's luminosity from its photosphere at an effective temperature of about 4,736 K.[7]
Referencesedit
^ abcdefvan 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.
^ abcdefghiDucati, J. R. (2002), "VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system", VizieR On-line Data Catalog, 2237, Bibcode:2002yCat.2237....0D.
^ abcdeBarisevičius, G.; et al. (2011), "Chemical Composition of the RS CVn-type Star 33 Piscium", Baltic Astronomy, 20: 53–63, arXiv:1105.5650, Bibcode:2011BaltA..20...53B, doi:10.1515/astro-2017-0268, S2CID 118081703.
^ abde Bruijne, J. H. J.; Eilers, A.-C. (October 2012), "Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project", Astronomy & Astrophysics, 546: 14, arXiv:1208.3048, Bibcode:2012A&A...546A..61D, doi:10.1051/0004-6361/201219219, S2CID 59451347, A61.
^ abHarper, W. E. (October 1926), "Two K-type spectroscopic binaries", Publications of the Dominion Observatory Ottawa, 3: 341–348, Bibcode:1926PDAO....3..341H.
^ abcdFeuillet, Diane K.; et al. (2016), "Determining Ages of APOGEE Giants with Known Distances", The Astrophysical Journal, 817 (1): 15, arXiv:1511.04088, Bibcode:2016ApJ...817...40F, doi:10.3847/0004-637X/817/1/40, S2CID 118675933, 40.
^ abcdeMassarotti, Alessandro; et al. (January 2008), "Rotational and Radial Velocities for a Sample of 761 HIPPARCOS Giants and the Role of Binarity", The Astronomical Journal, 135 (1): 209–231, Bibcode:2008AJ....135..209M, doi:10.1088/0004-6256/135/1/209, S2CID 121883397.
^Campbell, William Wallace; et al. (1911), "Sixty-eight stars whose radial velocities vary", Lick Observatory Bulletin, 199: 140–154, Bibcode:1911LicOB...6..140C, doi:10.5479/ADS/bib/1911LicOB.6.140C.
^Kazarovets, E. V.; Samus, N. N. (October 1990), "The 70th Name-List of Variable Stars", Information Bulletin on Variable Stars, 3530: 1, Bibcode:1990IBVS.3530....1K.
January 01, 1970
piscium, binary, star, system, zodiac, constellation, pisces, visible, naked, with, apparent, visual, magnitude, distance, this, system, determined, from, annual, parallax, shift, about, light, years, moving, closer, with, heliocentric, radial, velocity, narro. 33 Piscium is a binary star system in the zodiac constellation of Pisces It is visible to the naked eye with an apparent visual magnitude of 4 61 2 The distance to this system as determined from an annual parallax shift of 25 32 0 53 mas 1 is about 129 light years It is moving closer to the Sun with a heliocentric radial velocity of 6 6 km s 4 33 PisciumThe narrow triangle in which this comparative star in apparent magnitude brightness viewed from Earth figures Click to show context Observation dataEpoch J2000 Equinox J2000 Constellation Pisces Right ascension 00h 05m 20 14193s 1 Declination 05 42 27 4279 1 Apparent magnitude V 4 61 2 Characteristics Spectral type K0 IIIb 3 Apparent magnitude U 6 52 2 Apparent magnitude B 5 65 2 Apparent magnitude R 3 83 2 Apparent magnitude I 3 29 2 Apparent magnitude J 2 89 2 Apparent magnitude H 2 31 2 Apparent magnitude K 2 21 2 B V color index 1 029 0 037 Variable type RS CVn 3 AstrometryRadial velocity Rv 6 56 0 23 4 km sProper motion m RA 6 54 1 mas yr Dec 87 85 1 mas yrParallax p 25 32 0 53 mas 1 Distance129 3 ly 39 5 0 8 pc Absolute magnitude MV 1 63 5 Orbit 6 Period P 72 93 dEccentricity e 0 272 0 017Periastron epoch T 2 422 530 330 0 809 JDArgument of periastron w secondary 337 71 4 60 Semi amplitude K1 primary 16 43 0 31 km s Details 7 Mass0 83 0 22 M Radius7 8 R Luminosity24 8 L Surface gravity log g 2 620 0 11 cgsTemperature4 736 92 KMetallicity Fe H 0 12 0 05 dexRotational velocity v sin i 0 0 8 km sAge4 8 3 3 1 2 Myr Other designations33 Psc BC Psc BD 06 6357 FK5 1002 GC 59 HD 28 HIP 443 HR 3 SAO 128572 PPM 181831 GCRV 36 GSC 04669 00996 2MASS J00052013 0542275 9 Database referencesSIMBADdata This system was found to have a variable radial velocity by Leah Allen and Adelaide Hobe of Lick Observatory in 1911 10 It was identified as a single lined spectroscopic binary and the orbital elements were published by Canadian astronomer W E Harper in 1926 3 The pair have an orbital period of 72 93 days and an eccentricity of 0 27 6 This is a RS Canum Venaticorum variable 3 indicating a close binary system with active star spots and has the variable star designation BC Psc 11 The primary component A is a first ascent red giant with a stellar classification of K0 IIIb having chemical abundances that match a first dredge up mixing model Pourbaix amp Boffin 2003 estimated the mass of the primary as 1 7 0 4 M and the secondary as 0 76 0 11 M 3 However Feuillet et al 2016 derived a much lower mass estimate of 0 83 0 22 M for the primary 7 At the age of roughly five 7 billion years the star has expanded to 7 times the radius of the Sun 8 It is radiating 24 8 times the Sun s luminosity from its photosphere at an effective temperature of about 4 736 K 7 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 amp A 474 653V doi 10 1051 0004 6361 20078357 S2CID 18759600 a b c d e f g h i Ducati J R 2002 VizieR Online Data Catalog Catalogue of Stellar Photometry in Johnson s 11 color system VizieR On line Data Catalog 2237 Bibcode 2002yCat 2237 0D a b c d e Barisevicius G et al 2011 Chemical Composition of the RS CVn type Star 33 Piscium Baltic Astronomy 20 53 63 arXiv 1105 5650 Bibcode 2011BaltA 20 53B doi 10 1515 astro 2017 0268 S2CID 118081703 a b de Bruijne J H J Eilers A C October 2012 Radial velocities for the HIPPARCOS Gaia Hundred Thousand Proper Motion project Astronomy amp Astrophysics 546 14 arXiv 1208 3048 Bibcode 2012A amp A 546A 61D doi 10 1051 0004 6361 201219219 S2CID 59451347 A61 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 Harper W E October 1926 Two K type spectroscopic binaries Publications of the Dominion Observatory Ottawa 3 341 348 Bibcode 1926PDAO 3 341H a b c d Feuillet Diane K et al 2016 Determining Ages of APOGEE Giants with Known Distances The Astrophysical Journal 817 1 15 arXiv 1511 04088 Bibcode 2016ApJ 817 40F doi 10 3847 0004 637X 817 1 40 S2CID 118675933 40 a b c d e Massarotti Alessandro et al January 2008 Rotational and Radial Velocities for a Sample of 761 HIPPARCOS Giants and the Role of Binarity The Astronomical Journal 135 1 209 231 Bibcode 2008AJ 135 209M doi 10 1088 0004 6256 135 1 209 S2CID 121883397 33 Psc SIMBAD Centre de donnees astronomiques de Strasbourg Retrieved 2018 03 12 Campbell William Wallace et al 1911 Sixty eight stars whose radial velocities vary Lick Observatory Bulletin 199 140 154 Bibcode 1911LicOB 6 140C doi 10 5479 ADS bib 1911LicOB 6 140C Kazarovets E V Samus N N October 1990 The 70th Name List of Variable Stars Information Bulletin on Variable Stars 3530 1 Bibcode 1990IBVS 3530 1K Retrieved from https en wikipedia org w index php title 33 Piscium amp oldid 1187145715, wikipedia, wiki, book, books, library,
