Pi Persei

{{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=Pi Persei

|x=696|y=696

}}

| caption = Location of π Persei (circled)

}}

{{Starbox observe

| epoch = J2000

| constell = Perseus

| ra = {{RA|02|58|45.66858}}

| dec = {{DEC|+39|39|45.8212}}

| appmag_v = 4.70

}}

{{Starbox character

| type =

| class = A2Vn

| b-v = +0.06

| u-b = +0.12

| variable =

}}

{{Starbox astrometry

| radial_v = +14.2

| prop_mo_ra = +26.224

| prop_mo_dec = −41.899

| parallax = 10.7797

| p_error = 0.2794

| parallax_footnote =

| absmag_v = −0.21

}}

{{Starbox detail

| mass = 2.07

| radius = 4.8

| temperature = 9,290

| luminosity = 170

| rotational_velocity = 186

| gravity = 3.53

| age_myr = 272

}}

{{Starbox catalog

| names = {{odlist | name=Gorgonea Secunda | B=π Per | F=22 Persei | BD=+39°681 | FK5=2207 | HD=18411 | HIP=13879 | HR=879 | SAO=56047 | GC=3567 }}

}}

{{Starbox reference

| Simbad = pi+Per

}}

π Persei, Latinized as Pi Persei, is a single star in the northern constellation of Perseus. It has the traditional name Gorgonea Secunda {{IPAc-en|g|ɔːr|g|@|'|n|iː|@|_|s|I|'|k|V|n|d|@}}, the second of three Gorgons in the mythology of the hero Perseus. This star has a white hue and is faintly visible to the naked eye with an apparent visual magnitude of +4.7. It is located at a distance of approximately 303 light years from the Sun based on parallax, and is moving further away with a radial velocity of +14 km/s.

This object is an A-type main-sequence star with a stellar classification of A2Vn, where the 'n' suffix indicates broad (nebulous) lines due to rapid rotation. It is spinning with a projected rotational velocity of 186 km/s, which is creating an equatorial bulge that is 6% wider than the polar radius. The star is 272 million years old with double the mass of the Sun. It has 4.8 times the Sun's radius and is radiating 170 times the luminosity of the Sun from its photosphere at an effective temperature of 9,290 K.

References

{{reflist|refs=

{{cite web

| first=James B. | last=Kaler | date=November 21, 2014

| title=Pi Persei | work=STARS

| url=http://stars.astro.illinois.edu/sow/gorgsec.html

| access-date=2019-10-12 }}

{{cite journal

| last1=Eggleton | first1=P. P. | last2=Tokovinin | first2=A. A.

| title=A catalogue of multiplicity among bright stellar systems

| journal=Monthly Notices of the Royal Astronomical Society

| volume=389 | issue=2 | pages=869–879 | date=September 2008

| bibcode=2008MNRAS.389..869E | arxiv=0806.2878

| doi=10.1111/j.1365-2966.2008.13596.x | doi-access=free | s2cid=14878976 }}

{{cite journal

| volume=99 | pages=135 | year=1995

| title=The Relation between Rotational Velocities and Spectral Peculiarities among A-Type Stars

| journal=Astrophysical Journal Supplement

| last1=Abt | first1=Helmut A. | last2=Morrell | first2=Nidia I.

| bibcode=1995ApJS...99..135A | doi=10.1086/192182 | doi-access=free }}

{{cite journal

| last1=David | first1=Trevor J. | last2=Hillenbrand | first2=Lynne A.

| title=The Ages of Early-Type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets

| journal=The Astrophysical Journal

| volume=804 | issue=2 | pages=146 | year=2015

| bibcode=2015ApJ...804..146D | arxiv=1501.03154

| doi=10.1088/0004-637X/804/2/146 | s2cid=33401607 }}

[http://vizier.u-strasbg.fr/viz-bin/VizieR-4?-source=J/ApJ/804/146/table5&HIP=13879 Vizier catalog entry]

{{cite journal

| last=van Belle | first=Gerard T.

| title=Interferometric observations of rapidly rotating stars

| journal=The Astronomy and Astrophysics Review

| volume=20 | issue=1 | page=51 | date=March 2012

| bibcode=2012A&ARv..20...51V | arxiv=1204.2572

| doi=10.1007/s00159-012-0051-2 | s2cid=119273474

}}

{{cite journal

| last=Ducati | first=J. R.

| title=VizieR Online Data Catalog: 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 }}

{{cite journal

| 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 | isbn=9780598216885 | lccn=54001336 }}

{{cite journal

| 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=13879 Vizier catalog entry]

{{cite journal

| last1=Zorec | first1=J. | last2=Royer | first2=F.

| title=Rotational velocities of A-type stars

| journal=Astronomy & Astrophysics

| volume=537 | pages=A120 | year=2012

| arxiv=1201.2052 | bibcode=2012A&A...537A.120Z

| doi=10.1051/0004-6361/201117691

| s2cid=55586789 }} [http://vizier.u-strasbg.fr/viz-bin/VizieR-4?-source=J/A%2bA/537/A120/table1&HD=18411 Vizier catalog entry]

{{cite journal

| last1=Allende Prieto | first1=C. | last2=Lambert | first2=D. L.

| title=Fundamental parameters of nearby stars from the comparison with evolutionary calculations: Masses, radii and effective temperatures

| journal=Astronomy and Astrophysics

| volume=352 | pages=555–562 | year=1999

| bibcode=1999A&A...352..555A | arxiv=astro-ph/9911002

}} [http://vizier.u-strasbg.fr/viz-bin/VizieR-4?-source=J/A%2bA/352/555/table1&Name=HIP13879 Vizier catalog entry]

{{cite book

| first=Richard Hinckley | last=Allen

| title=Star-names and Their Meanings

| url=https://archive.org/details/bub_gb_5xQuAAAAIAAJ

| year=1899 | publisher=G.E. Stechert | page=[https://archive.org/details/bub_gb_5xQuAAAAIAAJ/page/n356 334] }}

}}

Category:A-type main-sequence stars

Category:Perseus (constellation)