lambda Persei
{{Short description|Star in the constellation Perseus}}
{{Starbox begin}}
{{Starbox image
| image =
{{Location mark
|image=Perseus constellation map.svg|alt=|float=center|width=280
|label=|position=right
|mark=Red circle.svg|mark_width=10|mark_link=Lambda Persei
|x=362|y=401
}}
| caption = Location of λ Persei (circled)
}}
{{Starbox observe
| epoch = J2000
| constell = Perseus
}}
{{Starbox character
| type =
| variable =
}}
{{Starbox astrometry
| parallax = 7.73
| p_error = 0.22
}}
{{Starbox detail
| mass =
}}
{{Starbox catalog
| names = {{odlist | B=λ Per | F=47 Persei | BD=+49°1101 | FK5=1113 | HD=25642 | HIP=19167 | HR=1261 | SAO=24412 | GC=4924 }}
}}
{{Starbox reference
| Simbad = Lambda+Persei
}}
{{Starbox end}}
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. This object is located approximately 422 light years from the Sun based on parallax, and is drifting further away with a radial velocity of +6 km/s.
This object has a stellar classification of A0IVn, 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, which is giving the star an equatorial bulge that is an estimated 16% larger than the polar radius. 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. The star is 345 million years old and is radiating 348 times the luminosity of the Sun from its photosphere at an effective temperature of 10,585 K.
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).{{in lang|zh}} [http://aeea.nmns.edu.tw/2006/0607/ap060711.html AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 7 月 11 日] {{Webarchive|url=https://web.archive.org/web/20120204114123/http://aeea.nmns.edu.tw/2006/0607/ap060711.html |date=2012-02-04 }} 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.
References
{{reflist|refs=
| title=lam Per | access-date=2019-09-22 }}
| title=Lambda Persei: an Unusual B9 IV Star
| last1=Underhill | first1=Anne B.
| journal=Publications of the Astronomical Society of the Pacific
| volume=103 | page=1176 | date=November 1991
| doi=10.1086/132937 | bibcode=1991PASP..103.1176U | s2cid=121711589 }}
| display-authors=1 | last1=Pasinetti Fracassini | first1=L. E.
| last2=Pastori | first2=L. | last3=Covino | first3=S. | last4=Pozzi | first4=A.
| title=Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS)
| edition=Third | journal=Astronomy and Astrophysics
| volume=367 | issue=2 | pages=521–524 | date=February 2001
| bibcode=2001A&A...367..521P | arxiv=astro-ph/0012289
| doi=10.1051/0004-6361:20000451 | s2cid=425754 }}
{{cite journal | display-authors=1
| last1=Cowley | first1=A. | last2=Cowley | first2=C.
| last3=Jaschek | first3=M. | last4=Jaschek | first4=C.
| title=A study of the bright A stars. I. A catalogue of spectral classifications
| journal=Astronomical Journal
| volume=74 | pages=375–406 | date=April 1969
| doi=10.1086/110819 | bibcode=1969AJ.....74..375C }}
| title=Interferometric observations of rapidly rotating stars
| last1=Belle | first1=G. T.
| journal=The Astronomy and Astrophysics Review
| volume=20| page=51 | year=2012
| issue=1 | bibcode=2012A&ARv..20...51V | arxiv=1204.2572
| doi=10.1007/s00159-012-0051-2 | s2cid=119273474 }}
| title=Spatial distribution and kinematics of OB stars
| last1=Gontcharov | first1=G. A.
| journal=Astronomy Letters
| volume=38 | issue=11 | pages=694–706 | date=November 2012
| bibcode=2012AstL...38..694G | arxiv=1606.09028
| doi=10.1134/S1063773712110035 | s2cid=119108982 }}
| last1=Van Leeuwen | first1=F.
| title=Validation of the new Hipparcos reduction
| journal=Astronomy and Astrophysics
| volume=474 | issue=2 | pages=653–664 | year=2007
| arxiv=0708.1752 | bibcode=2007A&A...474..653V
| doi=10.1051/0004-6361:20078357
| s2cid=18759600
}} [http://vizier.u-strasbg.fr/viz-bin/VizieR-S?HIP%2019167 Vizier catalog entry]
| last1=Ducati | first1=J. R.
| title=Catalogue of Stellar Photometry in Johnson's 11-color system
| journal=CDS/ADC Collection of Electronic Catalogues
| volume=2237 | year=2002 | bibcode=2002yCat.2237....0D }}
| last1=Hoffleit | first1=D. | last2=Warren | first2=W. H.
| title=Bright Star Catalogue | edition=5th Revised
| journal=VizieR On-line Data Catalog: V/50. Originally Published in: 1964BS....C......0H
| volume=5050 | year=1995 | bibcode=1995yCat.5050....0H }}
| last=Wilson | first=R. E. | year=1953
| title=General Catalogue of Stellar Radial Velocities
| journal=Carnegie Institute Washington D.C. Publication | publisher=Carnegie Institution for Science
| bibcode=1953GCRV..C......0W | lccn=54001336 }}
| last1=Anderson | first1=E. | last2=Francis | first2=Ch.
| title=XHIP: An extended hipparcos compilation
| journal=Astronomy Letters
| volume=38 | issue=5 | pages=331 | year=2012
| bibcode=2012AstL...38..331A | arxiv=1108.4971
| doi=10.1134/S1063773712050015
| s2cid=119257644 }} [http://vizier.u-strasbg.fr/viz-bin/VizieR-4?-source=V/137D/XHIP&HIP=19167 Vizier catalog entry]
| display-authors=1 | last1=Wu | first1=Yue
| last2=Singh | first2=H. P. | last3=Prugniel | first3=P.
| last4=Gupta | first4=R. | last5=Koleva | first5=M.
| title=Coudé-feed stellar spectral library – atmospheric parameters
| journal=Astronomy & Astrophysics
| volume=525 | pages=A71 | year=2010
| bibcode=2011A&A...525A..71W | arxiv=1009.1491
| doi=10.1051/0004-6361/201015014 | s2cid=53480665 }}
}}
{{Stars of Perseus}}
{{DEFAULTSORT:Lambda Persei}}