Variable star in the constellation Eridanus
μ Eridani A
light curve for Mu Eridani, adapted from Jerzykiewicz
et al. (2013). The red lines show the times of mid-eclipse.
[ 1] Observation dataEpoch J2000.0 Equinox J2000.0 (ICRS ) Constellation Eridanus Right ascension 04h 45m 30.15038s [ 2] Declination −03° 15′ 16.7765″[ 2] Apparent magnitude (V)4.00[ 3] Characteristics Spectral type B5 IV[ 4] U−Bcolor index −0.60[ 3] B−Vcolor index −0.15[ 3] Variable type SPB andAlgol [ 5] Astrometry Proper motion (μ)RA: +0.25[ 2] mas /yr Dec.: −1.97[ 2] mas /yr Parallax (π)6.25± 0.19 mas [ 2] Distance 520 ± 20 ly pc ) Absolute magnitude (MV )± 0.07[ 1] Orbit [ 1] Period (P)7.38090 d Eccentricity (e)± 0.021Periastron epoch (T)455 143 .254± 0.067 HJDArgument of periastron (ω)± 4.5Semi-amplitude 1 )± 0.021Details μ Eri A Mass ± 0.2[ 1] M ☉ Radius 6.1[ 5] R ☉ Luminosity 1,905[ 5] L ☉ Surface gravity (log g )3.5[ 1] cgs Temperature 15,668[ 5] K Metallicity 0[ 1] dex Rotational velocity (v sin i )± 3[ 5] Other designations μ Eri,BD -03°876,57 Eridani ,FK5 176,HD 30211,HIP 22109,HR 1520,SAO 131468.[ 6] Database references SIMBAD data
Mu Eridani (μ Eridani ) is abinary star system in theconstellation Eridanus . It is visible to thenaked eye with anapparent visual magnitude of 4.00.[ 3] parallax shift of 0.00625 arcseconds ,[ 2] light years from theSun .
In 1910, this was determined to be a single-linedspectroscopic binary star system. The pair orbit each other with aperiod of 7.38 days and aneccentricity of 0.344, during which they undergoAlgol-like eclipses .[ 1] slowly pulsating B-type star [ 5] stellar classification of B5 IV.[ 4] et al. in 2004.[ 7] et al. announced that eclipses had been detected.[ 8] projected rotational velocity of 130 km/s, which is at least 30% of the star'sbreak-up velocity .[ 5] solar luminosity from itsouter atmosphere at aneffective temperature of 15,668 K.[ 1] [ 5]
^a b c d e f g h Jerzykiewicz, M.; et al. (June 2013), "μ Eridani from MOST and from the ground: an orbit, the SPB component's fundamental parameters and the SPB frequencies",Monthly Notices of the Royal Astronomical Society ,432 (2):1032– 1045,arXiv :1303.6812 Bibcode :2013MNRAS.432.1032J ,doi :10.1093/mnras/stt522 ^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 Crawford, D. L.; et al. (1971), "Four-color, H-beta, and UBV photometry for bright B-type stars in the northern hemisphere",The Astronomical Journal ,76 : 1058,Bibcode :1971AJ.....76.1058C ,doi :10.1086/111220 . ^a b Levato, H. (January 1975), "Rotational velocities and spectral types for a sample of binary systems",Astronomy and Astrophysics Supplement Series ,19 :91– 99,Bibcode :1975A&AS...19...91L . ^a b c d e f g h Daszyńska-Daszkiewicz, J.; et al. (January 2015), "Oscillation modes in the rapidly rotating slowly pulsating B-type star μ Eridani",Monthly Notices of the Royal Astronomical Society ,446 (2):1438– 1448,arXiv :1410.6283 Bibcode :2015MNRAS.446.1438D ,doi :10.1093/mnras/stu2216 ^ "mu. Eri" .SIMBAD Centre de données astronomiques de Strasbourg . Retrieved2016-11-01 .^ Handler, G.; Shobbrook, R. R.; Jerzykiewicz, M.; Krisciunas, K.; Tshenye, T.; Rodríguez, E.; Costa, V.; Zhou, A. -Y.; Medupe, R.; Phorah, W. M.; Garrido, R.; Amado, P. J.; Paparó, M.; Zsuffa, D.; Ramokgali, L.; Crowe, R.; Purves, N.; Avila, R.; Knight, R.; Brassfield, E.; Kilmartin, P. M.; Cottrell, P. L. (January 2004)."Asteroseismology of the β Cephei star ν Eridani - I. Photometric observations and pulsational frequency analysis" .Monthly Notices of the Royal Astronomical Society .347 (2):454– 462.arXiv :astro-ph/0501263 Bibcode :2004MNRAS.347..454H .doi :10.1111/j.1365-2966.2004.07214.x . Retrieved24 December 2024 . ^ Jerzykiewicz, M.; Handler, G.; Shobbrook, R. R.; Pigulski, A.; Medupe, R.; Mokgwetsi, T.; Tlhagwane, P.; Rodríguez, E. (June 2005)."Asteroseismology of the β Cephei star ν Eridani - IV. The 2003-2004 multisite photometric campaign and the combined 2002-2004 data" .Monthly Notices of the Royal Astronomical Society .360 (2):619– 630.arXiv :astro-ph/0504238 Bibcode :2005MNRAS.360..619J .doi :10.1111/j.1365-2966.2005.09088.x . Retrieved24 December 2024 .
