Quadruple star system in the constellation Pisces
Phi Piscium
Location of φ Piscium(circled)
Observation dataEpoch J2000.0 Equinox J2000.0
Constellation
Pisces
Right ascension
01h 13m 44.94617s [ 1]
Declination
+24° 35′ 01.3249″[ 1]
Apparent magnitude (V)
4.676 (A)/9.11 (B)
Characteristics
φ Psc A
Spectral type
K0III[ 2]
U−B color index
+0.
B−V color index
+1.03
φ Psc B
Spectral type
K0
U−B color index
+0.25
B−V color index
+0.92
Astrometry Radial velocity (Rv )5.9 km/s Proper motion (μ) RA: 16.901[ 1] mas /yr Dec.: −21.415[ 1] mas /yr Parallax (π)8.1541 ± 0.2028 mas [ 1] Distance 400 ± 10 ly (123 ± 3 pc ) Absolute magnitude (MV )−0.67[ 3]
Orbit [ 4] Companion φ Psc B Period (P) 7473± 3 d yr Eccentricity (e) 0.815± 0.005Argument of periastron (ω) (secondary) 71.9± 1.7 °
Details A Radius 23.63+0.66 −1.36 [ 1] R ☉ Luminosity 249.6± 7.1[ 1] L ☉ Surface gravity (log g )2.75[ 2] cgs Temperature 4,720+142 −65 [ 1] K Metallicity [Fe/H]−0.08[ 3] dex
Other designations Phi Psc, φ Psc ,
85 Piscium ,
BD +23° 158,
FK5 2082,
GC 1474,
HD 7318,
HIP 5742,
HR 360,
SAO 74571,
PPM 90580,
CCDM J01137+2435A,
WDS J01137+2435A[ 5]
Database references SIMBAD data
Phi Piscium , Latinized from φ Piscium , is a quadruple star [ 6] system approximately 380 light years away in the constellation Pisces . It consists of Phi Piscium A, with a spectral type of K0III, and Phi Piscium B.[ 5] Phi Piscium A possesses a surface temperature of 3,500 to 5,000 kelvins . Some suggest the only visible companion in the Phi Piscium B sub-system is a late F dwarf star , while others suggest it is a K0 star. The invisible component of the Phi Piscium B sub-system is proposed to have a spectral type of M2V.[ 7] The star system has a period of about 20½ years and has a notably high eccentricity of 0.815.[ 4]
Naming
In Chinese , 奎宿 (Kuí Sù ), meaning Legs (asterism) , refers to an asterism consisting of refers to an asterism consisting of φ Piscium, η Andromedae , 65 Piscium , ζ Andromedae , ε Andromedae , δ Andromedae , π Andromedae , ν Andromedae , μ Andromedae , β Andromedae , σ Piscium , τ Piscium , 91 Piscium , υ Piscium , χ Piscium and ψ¹ Piscium . Consequently, φ Piscium itself is known as 奎宿十四 (Kuí Sù shí sì , English: the Fourteenth Star of Legs .)[ 8]
References
^ a b c d e f g h 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 at VizieR .
^ a b McWilliam, Andrew (December 1990), "High-resolution spectroscopic survey of 671 GK giants", Astrophysical Journal Supplement Series (PDF), 74 : 1075–1128, Bibcode :1990ApJS...74.1075M , doi :10.1086/191527 .
^ a b Ryon, Jenna; et al. (August 2009), "Comparing the Ca ii H and K Emission Lines in Red Giant Stars", Publications of the Astronomical Society of the Pacific , 121 (882): 842, arXiv :0907.3346 , Bibcode :2009PASP..121..842R , doi :10.1086/605456 , S2CID 17821279 .
^ a b Griffin, R. F.; Herbig, G. H. (1991). "Spectroscopic binary orbits from photoelectric radial velocities. Paper 99: Phi PISCIUM". The Observatory . 111 : 155–162. Bibcode :1991Obs...111..155G .
^ a b "* phi Psc" . SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved October 1, 2007 .
^ 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 .
^ R.F. Griffin; G.H. Herbig (1991). "Spectroscopic binary orbits from photoelectric radial velocities. Paper 100: Phi PISCIUM B". The Observatory . 111 : 201–219. Bibcode :1991Obs...111..201G .
^ (in Chinese) AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 5 月 19 日