Epsilon Persei, Latinized from ε Persei, is a multiple star system in the northern constellation of Perseus. It has a combined apparent visual magnitude of +2.88,[2] which is bright enough to be viewed with the naked eye. Based upon parallax measurements, this system is located at a distance of roughly 640light-years (196parsecs) from Earth.[1]
This is a spectroscopic binary system, which means that the presence of an orbiting companion has been revealed by radial velocity variations in the spectrum of the primary. The two components are orbiting each other with a period of 14days at a high orbital eccentricity of 0.55. The secondary component has about 6–13% of the primary's mass and may have a stellar classification in the range from A6V to K1V. There may be a third component to this system with an orbital period of roughly 9,428days (25.8 years), although this has not been conclusively demonstrated. If this component exists, it would have about 51–139% of the primary's mass. This high level of uncertainty is because the inclination of the orbit is not known.[5]
The primary component of this system, Epsilon Persei A, is a massive star with 12–16[5] times the Sun's mass and near eight times the radius of the Sun.[3] It has a stellar classification of B0.5V,[3] making it a B-type main sequence star that is generating energy at its core through the nuclear fusion of hydrogen. Component A is radiating over 28,000[6] times the Sun's luminosity from its outer envelope at an effective temperature of 26,500K.[6] This gives the star the blue-white hue that is typical of B-type stars.[10]
Epsilon Persei A is a Beta Cephei variable star with a primary pulsation period of 0.1603days, or 6.24 cycles per day. It may have multiple pulsation frequencies.[4]
Lutz, T. E.; Lutz, J. H. (June 1977), "Spectral classification and UBV photometry of bright visual double stars", Astronomical Journal, 82: 431–434, Bibcode:1977AJ.....82..431L, doi:10.1086/112066
Libich, J.; etal. (February 2006), "The new orbital elements and properties of ɛ Persei", Astronomy and Astrophysics, 446 (2): 583–589, Bibcode:2006A&A...446..583L, doi:10.1051/0004-6361:20053032. Results per solution 6.
Hohle, M. M.; Neuhäuser, R.; Schutz, B. F. (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, S2CID111387483
Tetzlaff, N.; Neuhäuser, R.; Hohle, M. M. (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, S2CID118629873
"Light Curve", Hipparcos ESA, ESA, retrieved 17 February 2022
"The Colour of Stars", Australia Telescope, Outreach and Education, Commonwealth Scientific and Industrial Research Organisation, December 21, 2004, archived from the original on 2012-03-18, retrieved 2012-01-16
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