XX Persei

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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]
Characteristics
Spectral type M4Ib + B7V[3]
Variable type SRc[4]
Astrometry
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]
Details
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
SIMBADdata

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.

Variability[edit]

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]

Distance[edit]

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

Characteristics[edit]

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]

Companion[edit]

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]

References[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.


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Notes[edit]