The spectrum of this star matches a stellar classification of B5 III,[3] which indicates it is a giant star that has evolved away from the main sequence after exhausting the hydrogen at its core. It has about seven times the Sun's mass and has an estimated age of 6.8 million years.[5] The effective temperature of the outer envelope is 14,890 K,[3] with the energy being emitted at this temperature giving it the blue-white hue that is a characteristic of a B-type star.[10] It is rotating rapidly with a projected rotational velocity of 190 km s−1, which gives a lower bound for the actual azimuthal velocity along the star's equator.[8]
This is most probably a binary star and may be a triple star system. It has an optical companion with an apparent magnitude of +6.17 at an angular separation of 0.330 arcseconds and a position angle of 221°,[11] but it is uncertain whether this is an optical double star or a gravitationally bound companion. The star has also been categorized as a spectroscopic binary, indicating that it has an orbiting companion that has not been separately resolved with a telescope. Finally, this star may be a member of the Melotte 20open cluster, which would make it the second-brightest member after Mirfak.[12]
^ abcdefvan Leeuwen, F. (November 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.
^ abcdJohnson, H. L.; et al. (1966), "UBVRIJKL photometry of the bright stars", Communications of the Lunar and Planetary Laboratory, 4 (99): 99, Bibcode:1966CoLPL...4...99J
^ abcdZorec, J.; et al. (July 2009), "Fundamental parameters of B supergiants from the BCD system. I. Calibration of the (λ_1, D) parameters into Teff", Astronomy and Astrophysics, 501 (1): 297–320, arXiv:0903.5134, Bibcode:2009A&A...501..297Z, doi:10.1051/0004-6361/200811147, S2CID 14969137
^Evans, D. S. (June 20–24, 1966), "The Revision of the General Catalogue of Radial Velocities", in Batten, Alan Henry; Heard, John Frederick (eds.), Determination of Radial Velocities and their Applications, Proceedings from IAU Symposium no. 30, vol. 30, University of Toronto: International Astronomical Union, p. 57, Bibcode:1967IAUS...30...57E
^ abcTetzlaff, 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, S2CID 118629873
^ abUnderhill, A. B.; et al. (November 1979), "Effective temperatures, angular diameters, distances and linear radii for 160 O and B stars", Monthly Notices of the Royal Astronomical Society, 189 (3): 601–605, Bibcode:1979MNRAS.189..601U, doi:10.1093/mnras/189.3.601
^Fabricius, C.; Makarov, V. V. (April 2000), "Two-colour photometry for 9473 components of close Hipparcos double and multiple stars", Astronomy and Astrophysics, 356: 141–145, Bibcode:2000A&A...356..141F
^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
^van Buren, Dave; McCray, Richard (June 1988), "Bow shocks and bubbles are seen around hot stars by IRAS", Astrophysical Journal Letters, 329: L93–L96, Bibcode:1988ApJ...329L..93V, doi:10.1086/185184
^Allen, R. H. (1963). Star Names: Their Lore and Meaning (Reprint ed.). New York: Dover Publications Inc. p. 331. ISBN0-486-21079-0. Retrieved 2012-09-04.
^(in Chinese) AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 7 月 11 日
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delta, persei, delta, persei, double, star, northern, constellation, perseus, apparent, visual, magnitude, making, readily, visible, with, naked, parallax, measurements, give, distance, about, light, years, parsecs, from, earth, perseilocation, persei, circled. Delta Persei Delta Per d Persei d Per is a double star in the northern constellation of Perseus It has an apparent visual magnitude of 3 01 2 making it readily visible with the naked eye Parallax measurements give it a distance of about 520 light years 160 parsecs from the Earth 1 d PerseiLocation of d Persei circled Observation dataEpoch J2000 Equinox J2000Constellation PerseusRight ascension 03h 42m 55 50426s 1 Declination 47 47 15 1746 1 Apparent magnitude V 3 01 2 CharacteristicsSpectral type B5 III 3 U B color index 0 51 2 B V color index 0 12 2 AstrometryRadial velocity Rv 4 4 km sProper motion m RA 25 58 1 mas yr Dec 43 06 1 mas yrParallax p 6 32 0 47 mas 1 Distance520 40 ly 160 10 pc DetailsMass7 0 0 3 5 M Radius10 5 6 R Luminosity2 860 7 L Surface gravity log g 3 5 6 cgsTemperature14 890 3 KRotational velocity v sin i 190 8 km sAge50 1 6 8 5 MyrOther designationsd Persei 39 Persei BD 47 876 CCDM J03429 4748A FK5 131 GC 4427 HD 22928 HIP 17358 HR 1122 IDS 03171 4930 A PPM 46127 SAO 39053 WDS J03429 4747A 9 Database referencesSIMBADdataThe spectrum of this star matches a stellar classification of B5 III 3 which indicates it is a giant star that has evolved away from the main sequence after exhausting the hydrogen at its core It has about seven times the Sun s mass and has an estimated age of 6 8 million years 5 The effective temperature of the outer envelope is 14 890 K 3 with the energy being emitted at this temperature giving it the blue white hue that is a characteristic of a B type star 10 It is rotating rapidly with a projected rotational velocity of 190 km s 1 which gives a lower bound for the actual azimuthal velocity along the star s equator 8 This is most probably a binary star and may be a triple star system It has an optical companion with an apparent magnitude of 6 17 at an angular separation of 0 330 arcseconds and a position angle of 221 11 but it is uncertain whether this is an optical double star or a gravitationally bound companion The star has also been categorized as a spectroscopic binary indicating that it has an orbiting companion that has not been separately resolved with a telescope Finally this star may be a member of the Melotte 20 open cluster which would make it the second brightest member after Mirfak 12 Observation with the IRAS shows an extended ring like feature that may be a bow wave driven by radiation pressure from the star rather than a bubble being generated by the stellar wind This feature has an angular size of 15 25 arcminutes and a peak temperature of 38 K 13 It has an estimated peculiar velocity of more than 30 km s 1 making it a runaway star 14 Name and etymology EditThis star together with ps Per s Per a Per g Per and h Per has been called the Segment of Perseus 15 In Chinese 天船 Tian Chuan meaning Celestial Boat refers to an asterism consisting of d Persei h Persei a Persei g Persei ps Persei 48 Persei m Persei and HD 27084 Consequently the Chinese name for d Persei itself is 天船五 Tian Chuan wu English the Fifth Star of Celestial Boat 16 References Edit a b c d e f van Leeuwen F November 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 Johnson H L et al 1966 UBVRIJKL photometry of the bright stars Communications of the Lunar and Planetary Laboratory 4 99 99 Bibcode 1966CoLPL 4 99J a b c d Zorec J et al July 2009 Fundamental parameters of B supergiants from the BCD system I Calibration of the l 1 D parameters into Teff Astronomy and Astrophysics 501 1 297 320 arXiv 0903 5134 Bibcode 2009A amp A 501 297Z doi 10 1051 0004 6361 200811147 S2CID 14969137 Evans D S June 20 24 1966 The Revision of the General Catalogue of Radial Velocities in Batten Alan Henry Heard John Frederick eds Determination of Radial Velocities and their Applications Proceedings from IAU Symposium no 30 vol 30 University of Toronto International Astronomical Union p 57 Bibcode 1967IAUS 30 57E a b c Tetzlaff N Neuhauser 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 S2CID 118629873 a b Underhill A B et al November 1979 Effective temperatures angular diameters distances and linear radii for 160 O and B stars Monthly Notices of the Royal Astronomical Society 189 3 601 605 Bibcode 1979MNRAS 189 601U doi 10 1093 mnras 189 3 601 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 Abt Helmut A Levato Hugo Grosso Monica July 2002 Rotational Velocities of B Stars The Astrophysical Journal 573 1 359 365 Bibcode 2002ApJ 573 359A doi 10 1086 340590 V del Per Variable Star SIMBAD Centre de Donnees astronomiques de Strasbourg retrieved 2012 01 06 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 Fabricius C Makarov V V April 2000 Two colour photometry for 9473 components of close Hipparcos double and multiple stars Astronomy and Astrophysics 356 141 145 Bibcode 2000A amp A 356 141F 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 van Buren Dave McCray Richard June 1988 Bow shocks and bubbles are seen around hot stars by IRAS Astrophysical Journal Letters 329 L93 L96 Bibcode 1988ApJ 329L 93V doi 10 1086 185184 van Buren Dave Noriega Crespo Alberto Dgani Ruth December 1995 An IRAS ISSA Survey of Bow Shocks Around Runaway Stars Astronomical Journal 110 2914 Bibcode 1995AJ 110 2914V doi 10 1086 117739 Allen R H 1963 Star Names Their Lore and Meaning Reprint ed New York Dover Publications Inc p 331 ISBN 0 486 21079 0 Retrieved 2012 09 04 in Chinese AEEA Activities of Exhibition and Education in Astronomy 天文教育資訊網 2006 年 7 月 11 日External links EditAl Thurayya Retrieved from https en wikipedia org w index php title Delta Persei amp oldid 1094167752, wikipedia, wiki, book, books, library,
