48 Persei
Location of 48 Persei (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Perseus
Right ascension 04h 08m 39.69216s[1]
Declination 47° 42′ 45.0429″[1]
Apparent magnitude (V) 4.03[2]
Characteristics
Spectral type B3Ve[3]
U−B color index -0.55[2]
B−V color index -0.03[2]
Variable type γ Cas[4]
Astrometry
Radial velocity (Rv)+0.80[5] km/s
Proper motion (μ) RA: +21.73[1] mas/yr
Dec.: -33.61[1] mas/yr
Parallax (π)6.84 ± 0.16 mas[1]
Distance480 ± 10 ly
(146 ± 3 pc)
Absolute magnitude (MV)-1.86[6]
Details
Mass7.5[7] M☉
Luminosity600[6] L☉
Surface gravity (log g)3.86[8] cgs
Temperature17,490[8] K
Metallicity [Fe/H]-0.04[9] dex
Rotational velocity (v sin i)197[8] km/s
Other designations
c Persei, MX Persei, BD+47°939, FK5 152, GC 4967, HIP 19343, HR 1273, HD 25940, SAO 39336
Database references
SIMBADdata

48 Persei (also known as c Persei, 48 Per, HR 1273, HIP 19343, or HD 25940) is a Be star in the constellation Perseus, approximately the 500th brightest of the visible stars in apparent magnitude.[10] It is "well known for its complex spectrum and for its light and velocity variations".[11] The name "48 Persei" is a Flamsteed designation given to it by John Flamsteed in his catalogue, published in 1712.[12]

A light curve for MX Persei, plotted from Hipparcos data[13]

48 Persei is classified as a Gamma Cassiopeiae variable, and it has been given the variable star designation MX Persei. The star's brightness varies by 0.09 magnitudes in visible light.[14] Koen and Eyer examined the Hipparcos data for this star, and found it varied with a period of 5.0569 days.[15]

As a Be star, it is hot and blue, spinning so rapidly that it forms an unstable equatorial disk of matter surrounding it. Its mass has been estimated as seven times that of the Sun, and its estimated age of 40 million years makes it much younger than the Sun. In another few million years it will likely cease hydrogen fusion, expand, and brighten as it becomes a red giant.[16]

A 1989 study proposed 48 Persei to be a single-lined spectroscopic binary with a period of 16.6 days, but subsequent studies, including close imaging surveys, have not confirmed this result. Hutter et al. (2021) consider it to be a single star.[17]

References

  1. ^ a b c d e 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 c Ducati, J. R. (2002). "VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system". CDS/ADC Collection of Electronic Catalogues. 2237. Bibcode:2002yCat.2237....0D.
  3. ^ Hoffleit, D.; Warren, W. H. (1995). "VizieR Online Data Catalog: Bright Star Catalogue, 5th Revised Ed. (Hoffleit+, 1991)". VizieR On-line Data Catalog: V/50. Originally Published in: 1964BS....C......0H. 5050. Bibcode:1995yCat.5050....0H.
  4. ^ 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.
  5. ^ Evans, D. S. (1967). "The Revision of the General Catalogue of Radial Velocities". Determination of Radial Velocities and Their Applications. 30: 57. Bibcode:1967IAUS...30...57E.
  6. ^ a b 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
  7. ^ Tetzlaff, N.; Neuhäuser, R.; Hohle, M. M. (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. Vizier catalog entry
  8. ^ a b c Zorec, J.; Frémat, Y.; Domiciano De Souza, A.; Royer, F.; Cidale, L.; Hubert, A.-M.; Semaan, T.; Martayan, C.; Cochetti, Y. R.; Arias, M. L.; Aidelman, Y.; Stee, P. (2016). "Critical study of the distribution of rotational velocities of Be stars". Astronomy & Astrophysics. 595: A132. Bibcode:2016A&A...595A.132Z. doi:10.1051/0004-6361/201628760. hdl:11336/37946.
  9. ^ Wu, Yue; Singh, H. P.; Prugniel, P.; Gupta, R.; Koleva, M. (2010). "Coudé-feed stellar spectral library – atmospheric parameters". Astronomy & Astrophysics. 525: A71. arXiv:1009.1491. Bibcode:2011A&A...525A..71W. doi:10.1051/0004-6361/201015014. S2CID 53480665.
  10. ^ 48 Persei (HIP 19343), Ashland Astronomy Studio, archived from the original on 2013-01-02, retrieved 2012-12-28.
  11. ^ Percy, J. R.; Lane, M. C. (May 1977), "Search for Beta Cephei stars. I - Photometric and spectroscopic studies of northern B-type stars", Astronomical Journal, 82: 353–359, Bibcode:1977AJ.....82..353P, doi:10.1086/112057.
  12. ^ Baily, Francis, ed. (1835), An account of the Revd. John Flamsteed, the first astronomer-royal: compiled from his own manuscripts, and other authentic documents, never before published. To which is added his British catalogue of stars, cor. and enl., Lords Commissioners of the Admiralty, p. 425.
  13. ^ "/ftp/cats/more/HIP/cdroms/cats". Centre de Données astronomiques de Strasbourg. Strasbourg astronomical Data Center. Retrieved 15 October 2022.
  14. ^ "MX Per". The International Variable Star Index. AAVSO. Retrieved 30 November 2022.
  15. ^ Koen, Chris; Eyer, Laurent (March 2002). "New periodic variables from the Hipparcos epoch photometry". Monthly Notices of the Royal Astronomical Society. 331 (1): 45–59. arXiv:astro-ph/0112194. Bibcode:2002MNRAS.331...45K. doi:10.1046/j.1365-8711.2002.05150.x. S2CID 10505995.
  16. ^ Kaler, Jim (2009-01-16), "48 Per (48 Persei)", STARS, University of Illinois, retrieved 2012-12-28.
  17. ^ Hutter, D. J.; Tycner, C.; Zavala, R. T.; Benson, J. A.; Hummel, C. A.; Zirm, H. (2021). "Surveying the Bright Stars by Optical Interferometry. III. A Magnitude-limited Multiplicity Survey of Classical Be Stars". The Astrophysical Journal Supplement Series. 257 (2): 69. arXiv:2109.06839. Bibcode:2021ApJS..257...69H. doi:10.3847/1538-4365/ac23cb. S2CID 237503492.

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