Xi Persei

Menkib


Location of ξ Persei (circled)

Observation data
Epoch J2000      Equinox J2000
Constellation Perseus
Right ascension 03h 58m 57.90229s[1]
Declination +35° 47′ 27.7132″[1]
Apparent magnitude (V) 4.04[2]
Characteristics
Spectral type O7.5III(n)((f))[3]
U−B color index −0.93[2]
B−V color index +0.02[2]
Variable type slightly variable[4]
Astrometry
Radial velocity (Rv)65.40[5] km/s
Proper motion (μ) RA: 3.62[1] mas/yr
Dec.: 1.74[1] mas/yr
Parallax (π)2.62 ± 0.51[1] mas
Distanceapprox. 1,200 ly
(approx. 380 pc)
Absolute magnitude (MV)−5.50[3]
Details
Mass26[3]-36[6] M☉
Radius14[6] R☉
Luminosity263,000[3] L☉
Surface gravity (log g)3.5[3] cgs
Temperature35,000[6] K
Rotational velocity (v sin i)220[3] km/s
Age~7[7] Myr
Other designations
46 Per, HR 1228, HD 24912, FK5 148, SAO 56856, HIP 18614
Database references
SIMBADdata

Xi Persei (ξ Persei, abbreviate Xi Per, ξ Per), also named Menkib,[8] is a star in the constellation of Perseus. It is approximately 1,200 light years from Earth.

Nomenclature

ξ Persei (Latinised to Xi Persei) is the star's Bayer designation.

It bore the traditional name Menkib, Menchib, Menkhib or Al Mankib, from Mankib al Thurayya (Arabic for "shoulder" [of the Pleiades]). In 2016, the International Astronomical Union organized a Working Group on Star Names (WGSN)[9] to catalogue and standardize proper names for stars. The WGSN approved the name Menkib for this star on 12 September 2016 and it is now so entered in the IAU Catalog of Star Names.[8]

Properties

Xi Persei has an apparent magnitude of +4.06 and is classified as a blue giant (spectral class O7.5III). It is intrinsically 12,700 times brighter than the Sun with absolute magnitude -5.5 in the V band. If the ultraviolet light that emanates from Menkib is included in its total, bolometric, luminosity is 263,000 times that of the Sun.

The star has a mass of some 30 solar masses and a surface temperature of 35,000 kelvins, making it one of the hottest stars that can be seen with the naked eye. The fluorescence of the California Nebula (NGC 1499) is due to this star’s prodigious radiation.[7]

References

  1. 1 2 3 4 5 Van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653. arXiv:0708.1752Freely accessible. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357.
  2. 1 2 3 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: 0. Bibcode:2002yCat.2237....0D.
  3. 1 2 3 4 5 6 Repolust, T.; Puls, J.; Herrero, A. (2004). "Stellar and wind parameters of Galactic O-stars. The influence of line-blocking/blanketing". Astronomy and Astrophysics. 415 (1): 349–376. Bibcode:2004A&A...415..349R. doi:10.1051/0004-6361:20034594.
  4. ↑ Ramiaramanantsoa, Tahina; Moffat, Anthony F. J.; Chené, André-Nicolas; Richardson, Noel D.; Henrichs, Huib F.; Desforges, Sébastien; Antoci, Victoria; Rowe, Jason F.; Matthews, Jaymie M.; Kuschnig, Rainer; Weiss, Werner W.; Sasselov, Dimitar; Rucinski, Slavek M.; Guenther, David B. (2014). "MOST detects corotating bright spots on the mid-O-type giant ξ Persei". Monthly Notices of the Royal Astronomical Society. 441: 910. arXiv:1403.7843Freely accessible. Bibcode:2014MNRAS.441..910R. doi:10.1093/mnras/stu619.
  5. ↑ Gontcharov, G. A. (2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065.
  6. 1 2 3 Krticka, J.; Kubat, J. (2010). "Comoving frame models of hot star winds. I. Test of the Sobolev approximation in the case of pure line transitions". Astronomy and Astrophysics. 519: A50. arXiv:1005.0258Freely accessible. Bibcode:2010A&A...519A..50K. doi:10.1051/0004-6361/201014111.
  7. 1 2 Hoogerwerf, R.; De Bruijne, J. H. J.; De Zeeuw, P. T. (2001). "On the origin of the O and B-type stars with high velocities. II. Runaway stars and pulsars ejected from the nearby young stellar groups". Astronomy and Astrophysics. 365 (2): 49. arXiv:astro-ph/0010057Freely accessible. Bibcode:2001A&A...365...49H. doi:10.1051/0004-6361:20000014.
  8. 1 2 "IAU Catalog of Star Names". Retrieved 28 July 2016.
  9. ↑ IAU Working Group on Star Names (WGSN), International Astronomical Union, retrieved 22 May 2016.
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