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b Persei

October 20, 2023

This article is about b Persei. For β Persei, see Algol.

b Persei (also known as HD 26961) is a spectroscopic triple star in the constellation Perseus. Its apparent magnitude is 4.60,[6] and it is about 320 light years away.[1]

b Persei
Location of b Persei (circled)
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Perseus
Right ascension 04h 18m 14.61690s[1]
Declination +50° 17′ 43.8058″[1]
Apparent magnitude (V) 4.52 - 4.68[2]
Characteristics
Spectral type A1III[3]
B−V color index +0.04[4]
Variable type Ellipsoidal[2]
Astrometry
Radial velocity (Rv)19.8±0.9[5] km/s
Proper motion (μ) RA: 45.42±0.40[1] mas/yr
Dec.: −56.72±0.32[1] mas/yr
Parallax (π)10.40 ± 0.35 mas[1]
Distance310 ± 10 ly
(96 ± 3 pc)
Absolute magnitude (MV)0.3[6]
Orbit[7]
PrimaryA or Aa
CompanionC or Ac
Period (P)701.76 days
Semi-major axis (a)5.09 mas
Eccentricity (e)0.235
Inclination (i)83.46°
Longitude of the node (Ω)115.29°
Periastron epoch (T)2440143.3984
Argument of periastron (ω)
(secondary)		263°
Details
A or Aa
Mass2.25[6] M☉
Radius3.2[8] R☉
Luminosity10[9] L☉
Temperature9000[6] K
Rotational velocity (v sin i)81[10] km/s
B or Ab
Mass0.56[11] M☉
Radius0.25[8] R☉
C or Ac
Mass1.24[11] M☉
Luminosity2[9] L☉
Other designations
BD+49°1150, GC 5174, HD 26961, HR 1324, HIP 20070, SAO 24531
Database references
SIMBADdata
Light curves for b Persei. The top panel, plotted from TESS data,[12] shows the variability of the inner binary pair. The lower panels, plotted from AAVSO data,[13] show two eclipses.

In addition to the primary, an A-type giant, there is a smaller and cooler companion in a 1.53 day orbit, probably an F-class star around absolute magnitude 3.0, and a more distant companion (star C or Ac) in an orbit calculated to be 702 days long.[6] The close binary pair forms a rotating ellipsoidal variable with a 1.53 day period. Star C forms an Algol-type variable system with the close binary, showing both primary eclipses (when star C passes in front of the inner pair) and secondary eclipses (when the inner pair passes in front of star C).[14] Timings of the eclipses show a 705.4-day period.[9]

References Edit

  1. ^ 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. Vizier catalog entry
  2. ^ 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.
  3. ^ Abt, Helmut A. (2009). "MK Classifications of Spectroscopic Binaries". The Astrophysical Journal Supplement. 180 (1): 117–18. Bibcode:2009ApJS..180..117A. doi:10.1088/0067-0049/180/1/117. S2CID 122811461.
  4. ^ 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
  5. ^ Wilson, R. E. (1953). General Catalogue of Stellar Radial Velocities. Carnegie Institution for Science. Bibcode:1953GCRV..C......0W. LCCN 54001336.
  6. ^ a b c d e Hill, G.; Aikman, G. C. L.; Cowley, A. P.; Bolton, C. T.; Thomas, J. C. (1976). "The radio-flaring triple system B Per". The Astrophysical Journal. 208: 152. Bibcode:1976ApJ...208..152H. doi:10.1086/154590.
  7. ^ ESA (1997). "The Hipparcos and Tycho Catalogues". VizieR On-line Data Catalog. 1239. Bibcode:1997yCat.1239....0E.
  8. ^ a b Duerbeck, H. W.; Schettler, A. (1979). "Photometric and spectroscopic study of the ellipsoidal variable b Persei". Acta Astronomica. 29: 225. Bibcode:1979AcA....29..225D.
  9. ^ a b c "Alert Notice 791: Anticipated secondary eclipse of b Per centered on September 29 2022 UT". AAVSO. Retrieved 2022-09-15.
  10. ^ Royer, F. (2007). "Rotational velocities of A-type stars. III. Velocity distributions". Astronomy and Astrophysics. 463 (2): 671–682. arXiv:astro-ph/0610785. Bibcode:2007A&A...463..671R. doi:10.1051/0004-6361:20065224. S2CID 18475298.
  11. ^ a b Tokovinin, Andrei (23 February 2018). "The Updated Multiple Star Catalog". The Astrophysical Journal Supplement Series. 235 (1): 6. arXiv:1712.04750. Bibcode:2018ApJS..235....6T. doi:10.3847/1538-4365/aaa1a5. eISSN 1538-4365.
  12. ^ "MAST: Barbara A. Mikulski Archive for Space Telescopes". Space Telescope Science Institute. Retrieved 14 September 2022.
  13. ^ "Download Data". aavso.org. AAVSO. Retrieved 14 September 2022.
  14. ^ "b Per". The International Variable Star Index. AAVSO. Retrieved 15 September 2022.

October 20, 2023
persei, this, article, about, persei, algol, also, known, 26961, spectroscopic, triple, star, constellation, perseus, apparent, magnitude, about, light, years, away, location, circled, observation, dataepoch, j2000, equinox, j2000, 0constellation, perseusright. This article is about b Persei For b Persei see Algol b Persei also known as HD 26961 is a spectroscopic triple star in the constellation Perseus Its apparent magnitude is 4 60 6 and it is about 320 light years away 1 b PerseiLocation of b Persei circled Observation dataEpoch J2000 0 Equinox J2000 0Constellation PerseusRight ascension 04h 18m 14 61690s 1 Declination 50 17 43 8058 1 Apparent magnitude V 4 52 4 68 2 CharacteristicsSpectral type A1III 3 B V color index 0 04 4 Variable type Ellipsoidal 2 AstrometryRadial velocity Rv 19 8 0 9 5 km sProper motion m RA 45 42 0 40 1 mas yr Dec 56 72 0 32 1 mas yrParallax p 10 40 0 35 mas 1 Distance310 10 ly 96 3 pc Absolute magnitude MV 0 3 6 Orbit 7 PrimaryA or AaCompanionC or AcPeriod P 701 76 daysSemi major axis a 5 09 masEccentricity e 0 235Inclination i 83 46 Longitude of the node W 115 29 Periastron epoch T 2440143 3984Argument of periastron w secondary 263 DetailsA or AaMass2 25 6 M Radius3 2 8 R Luminosity10 9 L Temperature9000 6 KRotational velocity v sin i 81 10 km sB or AbMass0 56 11 M Radius0 25 8 R C or AcMass1 24 11 M Luminosity2 9 L Other designationsBD 49 1150 GC 5174 HD 26961 HR 1324 HIP 20070 SAO 24531Database referencesSIMBADdataLight curves for b Persei The top panel plotted from TESS data 12 shows the variability of the inner binary pair The lower panels plotted from AAVSO data 13 show two eclipses In addition to the primary an A type giant there is a smaller and cooler companion in a 1 53 day orbit probably an F class star around absolute magnitude 3 0 and a more distant companion star C or Ac in an orbit calculated to be 702 days long 6 The close binary pair forms a rotating ellipsoidal variable with a 1 53 day period Star C forms an Algol type variable system with the close binary showing both primary eclipses when star C passes in front of the inner pair and secondary eclipses when the inner pair passes in front of star C 14 Timings of the eclipses show a 705 4 day period 9 References Edit 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 amp 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 Abt Helmut A 2009 MK Classifications of Spectroscopic Binaries The Astrophysical Journal Supplement 180 1 117 18 Bibcode 2009ApJS 180 117A doi 10 1088 0067 0049 180 1 117 S2CID 122811461 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 Wilson R E 1953 General Catalogue of Stellar Radial Velocities Carnegie Institution for Science Bibcode 1953GCRV C 0W LCCN 54001336 a b c d e Hill G Aikman G C L Cowley A P Bolton C T Thomas J C 1976 The radio flaring triple system B Per The Astrophysical Journal 208 152 Bibcode 1976ApJ 208 152H doi 10 1086 154590 ESA 1997 The Hipparcos and Tycho Catalogues VizieR On line Data Catalog 1239 Bibcode 1997yCat 1239 0E a b Duerbeck H W Schettler A 1979 Photometric and spectroscopic study of the ellipsoidal variable b Persei Acta Astronomica 29 225 Bibcode 1979AcA 29 225D a b c Alert Notice 791 Anticipated secondary eclipse of b Per centered on September 29 2022 UT AAVSO Retrieved 2022 09 15 Royer F 2007 Rotational velocities of A type stars III Velocity distributions Astronomy and Astrophysics 463 2 671 682 arXiv astro ph 0610785 Bibcode 2007A amp A 463 671R doi 10 1051 0004 6361 20065224 S2CID 18475298 a b Tokovinin Andrei 23 February 2018 The Updated Multiple Star Catalog The Astrophysical Journal Supplement Series 235 1 6 arXiv 1712 04750 Bibcode 2018ApJS 235 6T doi 10 3847 1538 4365 aaa1a5 eISSN 1538 4365 MAST Barbara A Mikulski Archive for Space Telescopes Space Telescope Science Institute Retrieved 14 September 2022 Download Data aavso org AAVSO Retrieved 14 September 2022 b Per The International Variable Star Index AAVSO Retrieved 15 September 2022 Retrieved from https en wikipedia org w index php title B Persei amp oldid 1141450528, wikipedia, wiki, book, books, library,

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