XX Persei

From the Science Archives, the open-project database of science information
Jump to navigation Jump to search

XX Persei
Comet Lovejoy.jpg
Red circle.svg
XX Persei (circled) near the Double Cluster and Comet Lovejoy
Credit: Juan lacruz
Observation data
Epoch J2000      Equinox J2000
Constellation Perseus
Right ascension 02h 03m 09.36064s[1]
Declination 55° 13′ 56.6187″[1]
Apparent magnitude (V) 7.9 - 9.0[2]
Spectral type M4Ib + B7V[3]
Variable type SRc[4]
Proper motion (μ) RA: -1.213 ± 0.039 [5] mas/yr
Dec.: -1.543 ± 0.036 [5] mas/yr
Parallax (π)0.95 ± 0.46[5] mas
Distance2,290[6] pc
Absolute magnitude (MV)−4.6[7]
Mass16[7] M
Radius710[8] R
Diameter710[8] D
Luminosity85,000[9] L
Temperature3,700[9] K
Other designations
XX Per, BD+54°444, GSC 03689-01837, HD 12401, HIP 9582, IRC+50052, 2MASS J02030935+5513566, HV 3414, SAO 22875, AAVSO 0156+54
Database references

XX Persei (IRC +50052 / HIP 9582 / BD+54 444) is a semiregular variable red supergiant star in the constellation Perseus, between the Double Cluster and the border with Andromeda.


XX Persei is a semiregular variable star of sub-type SRc, indicating a cool supergiant. The General Catalogue of Variable Stars gives the period as 415 days.[4] It also shows a long secondary period which was originally given at 4,100 days.[7] A more recent study shows only slow variations with a period of 3,150 ± 1,000 days.[2] Another study failed to find any long period up to 10,000 days.[10]


The most likely distance of XX Per is 2,290 parsecs, from assumed membership of the Perseus OB1 association.[6]


XX Per is a red supergiant of spectral type M4Ib with an effective temperature of 3,700 K. It has a large infrared excess, indicating surrounding dust at a temperature of 900 K, but no masers have been detected.[9][11]

XX Persei has a mass of 16 solar masses, above the limit beyond which stars end their lives as supernovae.[7]


XX Persei has a companion of magnitude 9.7 20.5" away.[3] The combined spectral type has been given as M4Ib + B7V,[3] while the UV spectrum of the companion has been used to derive a spectral classification of A.[12]

See also[edit]


  1. 1.0 1.1 Van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics 474 (2): 653. arXiv:0708.1752. Bibcode 2007A&A...474..653V. doi:10.1051/0004-6361:20078357.
  2. 2.0 2.1 Kiss, L. L.; Szabó, Gy. M.; Bedding, T. R. (2006). "Variability in red supergiant stars: Pulsations, long secondary periods and convection noise". Monthly Notices of the Royal Astronomical Society 372 (4): 1721. arXiv:astro-ph/0608438. Bibcode 2006MNRAS.372.1721K. doi:10.1111/j.1365-2966.2006.10973.x.
  3. 3.0 3.1 3.2 Proust, D.; Ochsenbein, F.; Pettersen, B. R. (1981). "A catalogue of variable-visual binary stars". Astronomy and Astrophysics Supplement Series 44: 179. Bibcode 1981A&AS...44..179P.
  4. 4.0 4.1 Samus, N. N.Expression error: Unrecognized word "etal". (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. 5.0 5.1 5.2 Gaia Collaboration (2016). "VizieR Online Data Catalog: Gaia DR1 (Gaia Collaboration, 2016)". VizieR On-line Data Catalog: I/337. Originally published in: Astron. Astrophys 1337. Bibcode 2016yCat.1337....0G.
  6. 6.0 6.1 Reiter, Megan; Marengo, Massimo; Hora, Joseph L.; Fazio, Giovanni G. (2015). "A Spitzer/IRAC characterization of Galactic AGB and RSG stars". Monthly Notices of the Royal Astronomical Society 447 (4): 3909. arXiv:1501.02749. Bibcode 2015MNRAS.447.3909R. doi:10.1093/mnras/stu2725.
  7. 7.0 7.1 7.2 7.3 Stothers, R.; Leung, K. C. (1971). "Luminosities, masses and periodicities of massive red supergiants". Astronomy and Astrophysics 10: 290. Bibcode 1971A&A....10..290S.
  8. {{{1}}}
  9. 9.0 9.1 9.2 Fok, Thomas K. T.; Nakashima, Jun-Ichi; Yung, Bosco H. K.; Hsia, Chih-Hao; Deguchi, Shuji (2012). "Maser Observations of Westerlund 1 and Comprehensive Considerations on Maser Properties of Red Supergiants Associated with Massive Clusters". The Astrophysical Journal 760: 65. arXiv:1209.6427. Bibcode 2012ApJ...760...65F. doi:10.1088/0004-637X/760/1/65.
  10. Percy, John R.; Sato, Hiromitsu (2009). "Long Secondary Periods in Pulsating Red Supergiant Stars". Journal of the Royal Astronomical Society of Canada 103: 11. Bibcode 2009JRASC.103...11P.
  11. Verheyen, L.; Messineo, M.; Menten, K. M. (2012). "SiO maser emission from red supergiants across the Galaxy . I. Targets in massive star clusters". Astronomy & Astrophysics 541: A36. arXiv:1203.4727. Bibcode 2012A&A...541A..36V. doi:10.1051/0004-6361/201118265.
  12. Buss, Richard H.; Snow, Theodore P. (1988). "Hot components and circumstellar grains in M supergiant syncretic binaries". Astrophysical Journal 335: 331. Bibcode 1988ApJ...335..331B. doi:10.1086/166931.

Add your comment
The Science Archives welcomes all comments. If you do not want to be anonymous, register or log in. It is free.

As a reminder, article comments are only for discussions on how to improve the article. Please direct other comments to a user's talk page. Please be formal and do not use excessive uppercase. Please be advised you may receive an automatic block if you break the article comments policy. For information regarding what is acceptable/not acceptable in article comments, please message Icons-flag-ru.png Joey (talk), Natalia (talk), Icons-flag-fr.png ynoss (talk), or Icons-flag-ca.png Daniel (older account/talk).