Astronomy:Lambda Persei

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Short description: Star in the constellation Perseus
Lambda Persei
Location of λ Persei (circled)
Observation data
Equinox J2000.0]] (ICRS)
Constellation Perseus[1]
Right ascension  04h 06m 35.04360s[2]
Declination +50° 21′ 04.5500″[2]
Apparent magnitude (V) 4.29[3]
Characteristics
Evolutionary stage main sequence[4]
Spectral type A0IVn[5]
U−B color index −0.04[3]
B−V color index +0.02[3]
Astrometry
Radial velocity (Rv)+6.1±2.0[6] km/s
Proper motion (μ) RA: −12.75[2] mas/yr
Dec.: −35.60[2] mas/yr
Parallax (π)7.73 ± 0.22[2] mas
Distance420 ± 10 ly
(129 ± 4 pc)
Absolute magnitude (MV)−1.31[1]
Details
Mass2.1[7] M☉
Radius6.9[8] R☉
Luminosity352[8] L☉
Surface gravity (log g)4.05[9] cgs
Temperature10,585[9] K
Metallicity [Fe/H]+0.01[9] dex
Rotational velocity (v sin i)196[10] km/s
Age345[11] Myr
Other designations
λ Per, 47 Persei, BD+49°1101, FK5 1113, GC 4924, HD 25642, HIP 19167, HR 1261, SAO 24412[12]
Database references
SIMBADdata

λ Persei, Latinized as Lambda Persei, is a star in the northern constellation of Perseus. It is visible to the naked eye as a faint, white-hued point of light with an apparent visual magnitude of 4.29.[3] This object is located approximately 422 light years from the Sun based on parallax,[2] and is drifting further away with a radial velocity of +6 km/s.[6]

λ Persei in optical light

This object has a stellar classification of A0IVn,[5] matching an A-type subgiant star with "nebulous" lines due to rapid rotation. It is spinning with a projected rotational velocity of 196 km/s,[10] which is giving the star an equatorial bulge that is an estimated 16% larger than the polar radius.[13] Unusually for a star of this type, spectra show weak emission features among the Hydrogen lines, which may be due to plage regions on the surface caused by an implied magnetic field.[14] The star is 345 million years old[11] and is radiating 352 times the luminosity of the Sun[8] from its photosphere at an effective temperature of 10,585 K.[9]

In Chinese astronomy, Lambda Persei is called 積水, Pinyin: Jīshuǐ, meaning Stored Water, because this star is marking itself and stand alone in Stored Water asterism, Stomach mansion (see : Chinese constellation).[15] This name has also been applied to Omicron Geminorum and was approved by the IAU Working Group on Star Names as the name of that star.[16]

References

  1. ↑ 1.0 1.1 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A  XHIP record for this object at VizieR.
  2. ↑ 2.0 2.1 2.2 2.3 2.4 2.5 Van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics 474 (2): 653–664. doi:10.1051/0004-6361:20078357. Bibcode: 2007A&A...474..653V.  Vizier catalog entry
  3. ↑ 3.0 3.1 3.2 3.3 Ducati, J. R. (2002). "Catalogue of Stellar Photometry in Johnson's 11-color system". CDS/ADC Collection of Electronic Catalogues 2237. Bibcode: 2002yCat.2237....0D. 
  4. ↑ Nascimbeni, V.; Piotto, G.; Ortolani, S.; Giuffrida, G.; Marrese, P. M.; Magrin, D.; Ragazzoni, R.; Pagano, I. et al. (2016). "An all-sky catalogue of solar-type dwarfs for exoplanetary transit surveys". Monthly Notices of the Royal Astronomical Society 463 (4): 4210. doi:10.1093/mnras/stw2313. Bibcode: 2016MNRAS.463.4210N. 
  5. ↑ 5.0 5.1 Cowley, A. et al. (April 1969). "A study of the bright A stars. I. A catalogue of spectral classifications". Astronomical Journal 74: 375–406. doi:10.1086/110819. Bibcode: 1969AJ.....74..375C. 
  6. ↑ 6.0 6.1 Wilson, R. E. (1953). "General Catalogue of Stellar Radial Velocities". Carnegie Institute Washington D.C. Publication (Carnegie Institution for Science). Bibcode: 1953GCRV..C......0W. 
  7. ↑ Khalatyan, A.; Anders, F.; Chiappini, C.; Queiroz, A. B. A.; Nepal, S.; Dal Ponte, M.; Jordi, C.; Guiglion, G. et al. (2024). "Transferring spectroscopic stellar labels to 217 million Gaia DR3 XP stars with SHBoost". Astronomy and Astrophysics 691: A98. doi:10.1051/0004-6361/202451427. Bibcode: 2024A&A...691A..98K. 
  8. ↑ 8.0 8.1 8.2 Fetherolf, Tara; Pepper, Joshua; Simpson, Emilie; Kane, Stephen R.; Močnik, Teo; English, John Edward; Antoci, Victoria; Huber, Daniel et al. (2023). "Variability Catalog of Stars Observed during the TESS Prime Mission". The Astrophysical Journal Supplement Series 268 (1): 4. doi:10.3847/1538-4365/acdee5. Bibcode: 2023ApJS..268....4F. 
  9. ↑ 9.0 9.1 9.2 9.3 Wu, Yue et al. (2010). "Coudé-feed stellar spectral library – atmospheric parameters". Astronomy & Astrophysics 525: A71. doi:10.1051/0004-6361/201015014. Bibcode: 2011A&A...525A..71W. 
  10. ↑ 10.0 10.1 Hoffleit, D.; Warren, W. H. (1995). "Bright Star Catalogue". VizieR On-line Data Catalog: V/50. Originally Published in: 1964BS....C......0H 5050. Bibcode: 1995yCat.5050....0H. 
  11. ↑ 11.0 11.1 Gontcharov, G. A. (November 2012). "Spatial distribution and kinematics of OB stars". Astronomy Letters 38 (11): 694–706. doi:10.1134/S1063773712110035. Bibcode: 2012AstL...38..694G. 
  12. ↑ "lam Per". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=lam+Per. 
  13. ↑ Belle, G. T. (2012). "Interferometric observations of rapidly rotating stars". The Astronomy and Astrophysics Review 20 (1): 51. doi:10.1007/s00159-012-0051-2. Bibcode: 2012A&ARv..20...51V. 
  14. ↑ Underhill, Anne B. (November 1991). "Lambda Persei: an Unusual B9 IV Star". Publications of the Astronomical Society of the Pacific 103: 1176. doi:10.1086/132937. Bibcode: 1991PASP..103.1176U. 
  15. ↑ Script error: The function "in_lang" does not exist. AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 7 月 11 日
  16. ↑ "IAU Catalog of Star Names". https://exopla.net/star-names/modern-iau-star-names/. 



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