Binary star system in the constellation Perseus
42 Persei Location of 42 Persei (circled)
Observation dataEpoch J2000 Equinox J2000 Constellation Perseus Right ascension 03h 49m 32.68952s [ 1] Declination +33° 05′ 28.9603″[ 1] Apparent magnitude (V)5.05 - 5.18[ 2] Characteristics Spectral type A3V[ 3] [ 4] U−Bcolor index +0.11[ 5] B−Vcolor index +0.07[ 5] Variable type Ellipsoidal [ 4] Astrometry Radial velocity (Rv )−12.40[ 6] km/s Proper motion (μ)RA: −28.483[ 7] mas /yr Dec.: +6.260[ 7] mas /yr Parallax (π)10.8041± 0.1504 mas [ 7] Distance 302 ± 4 ly pc ) Absolute magnitude (MV )0.57[ 8] Orbit [ 4] Period (P)1.7653511 ± 0.000002 d Semi-major axis (a)8.207 R ☉ Eccentricity (e)0.056 Inclination (i)65.3° Argument of periastron (ω)257° Semi-amplitude 1 )34.34 km/s Details 42 Per A Mass 2.0[ 4] M ☉ Radius 3.48[ 4] R ☉ Luminosity 59[ 9] L ☉ Surface gravity (log g )3.78[ 10] cgs Temperature 8,892[ 9] K Metallicity [Fe/H] 0.00[ 11] dex Rotational velocity (v sin i )91[ 9] 42 Per B Mass 0.38[ 4] M ☉ Temperature 3,500[ 4] K Other designations n Per ,42 Per ,V467 Per ,BD +32°667GC 4592HD 23848HIP 17886HR 1177SAO 56727Database references SIMBAD data
42 Persei is abinary star system in the northernconstellation ofPerseus . It has theBayer designation n Persei , while42 Persei is theFlamsteed designation . The system is visible to the naked eye as a dim, white-hued point of light with anapparent visual magnitude of 5.11.[ 5] [ 1] radial velocity of −12.4 km/s.[ 6]
Alight curve for V467 Persei, plotted fromTESS [ 12] 42 Persei is a single-linedspectroscopic binary with anorbital period of 1.77 days and aneccentricity of just 0.056.[ 4] eclipsing variable .[ 2] [ 4]
The visible component is anA-type main-sequence star with astellar classification of A3V;[ 3] core hydrogen . It has been reported as a mildAm star ,[ 13] [ 14] [ 4] mass of the Sun and 3.5[ 4] Sun's radius . It has a high rate of spin, showing aprojected rotational velocity of 91 km/s.[ 9] [ 9] luminosity of the Sun from itsphotosphere at aneffective temperature of 8,892 K.[ 9] red dwarf with 38% of the Sun's mass.[ 4]
InChinese astronomy , 42 Persei is called 天讒,Pinyin : Tiānchán, meaningCelestial Slander , because this star is marking itself and stand alone inCelestial Slander asterism,Hairy Head mansion (see :Chinese constellation ).[ 15]
^a b c 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 Samus, N. N.; Durlevich, O. V.; et al. (2009). "VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)".VizieR On-line Data Catalog: B/GCVS. Originally Published in: 2009yCat....102025S .1 .Bibcode :2009yCat....102025S . ^a b Hoffleit, D.; Warren, W. H. (1995). "VizieR Online Data Catalog: Bright Star Catalogue, 5th Revised Ed. (Hoffleit+, 1991)".VizieR On-line Data Catalog: V/50. Originally Published in: 1964BS....C......0H .5050 .Bibcode :1995yCat.5050....0H . ^a b c d e f g h i j k l Martin, Brian E. (1990)."The ellipsoidal variable 42 Persei - Observations and model" .Astronomical Society of the Pacific .102 :1153– 1160.Bibcode :1990PASP..102.1153M .doi :10.1086/132746 ^a b c 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 Pourbaix, D.; Tokovinin, A. A.; Batten, A. H.; Fekel, F. C.; Hartkopf, W. I.; Levato, H.; Morrell, N. I.; Torres, G.; Udry, S. (2004). "SB9: The ninth catalogue of spectroscopic binary orbits".Astronomy and 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 Brown, A. G. A. ; et al. (Gaia collaboration ) (August 2018)."Gaia Data Release 2: Summary of the contents and survey properties" .Astronomy & Astrophysics 616 . A1.arXiv :1804.09365 Bibcode :2018A&A...616A...1G doi :10.1051/0004-6361/201833051 Gaia DR2 record for this source atVizieR .^ 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 . Vizier catalog entry ^a b c d e f Zorec, J.; Royer, F. (2012). "Rotational velocities of A-type stars".Astronomy & Astrophysics .537 : A120.arXiv :1201.2052 Bibcode :2012A&A...537A.120Z .doi :10.1051/0004-6361/201117691 .S2CID 55586789 . ^ David, Trevor J.; Hillenbrand, Lynne A. (2015). "The Ages of Early-Type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets".The Astrophysical Journal .804 (2): 146.arXiv :1501.03154 Bibcode :2015ApJ...804..146D .doi :10.1088/0004-637X/804/2/146 .S2CID 33401607 . Vizier catalog entry ^ Gontcharov, G. A. (2012). "Dependence of kinematics on the age of stars in the solar neighborhood".Astronomy Letters .38 (12):771– 782.arXiv :1606.08814 Bibcode :2012AstL...38..771G .doi :10.1134/S1063773712120031 .S2CID 118345778 . ^ "MAST: Barbara A. Mikulski Archive for Space Telescopes" . Space Telescope Science Institute. Retrieved8 December 2021 .^ Margoni, R.; Munari, U.; Stagni, R. (1992). "Spectroscopic orbits of AM stars. I. Seven field stars".Astronomy and Astrophysics Supplement Series .93 : 545.Bibcode :1992A&AS...93..545M . ^ Renson, P.; Manfroid, J. (2009)."Catalogue of Ap, HGMN and Am stars" .Astronomy and Astrophysics .498 (3): 961.Bibcode :2009A&A...498..961R .doi :10.1051/0004-6361/200810788 ^ Ian Ridpath's Startales - Perseus
