Delta Persei

{{Starbox begin

| name = δ Persei

}}

{{Starbox image

| image=

{{Location mark

|image=Perseus constellation map.svg|alt=|float=center|width=260

|label=|position=right

|mark=Red circle.svg|mark_width=10|mark_link=δ Per

|x=464|y=480

}}

|caption=Location of δ Persei (circled)

}}

{{Starbox observe

| epoch = J2000

| ra = {{RA|03|42|55.50426}}

| dec = {{DEC|+47|47|15.1746}}

| appmag_v = 3.01

| constell = Perseus

}}

{{Starbox character

| class = B5 III

| b-v = –0.12

| u-b = –0.51

| variable =

}}

{{Starbox astrometry

| radial_v = +4

| prop_mo_ra = +25.58

| prop_mo_dec = −43.06

| parallax = 6.32

| p_error = 0.47

| parallax_footnote =

| absmag_v =

}}

{{Starbox detail

| age_myr = {{nowrap|50.1 ± 6.8}}

| metal_fe =

| gravity = 3.5

| mass = {{nowrap|7.0 ± 0.3}}

| radius = 10.5

| rotational_velocity = 190

| rotation =

| luminosity = 2,860{{citation | title=XHIP: An extended hipparcos compilation | last1=Anderson | first1=E. | last2=Francis | first2=Ch. | journal=Astronomy Letters | volume=38 | issue=5 | pages=331 | year=2012 | bibcode=2012AstL...38..331A | doi=10.1134/S1063773712050015 | arxiv=1108.4971 | s2cid=119257644 | postscript=. }}

| temperature = 14,890

}}

{{Starbox catalog

| names = δ Persei, 39 Persei, BD+47 876, CCDM J03429+4748A, FK5 131, GC 4427, HD 22928, HIP 17358, HR 1122, IDS 03171+4930 A, PPM 46127, SAO 39053, WDS J03429+4747A.

}}

{{Starbox reference

|Simbad=del+Per

}}

Delta Persei (Delta Per, δ Persei, δ Per) is a double star in the northern constellation of Perseus. It has an apparent visual magnitude of 3.01, making it readily visible with the naked eye. Parallax measurements give it a distance of about {{Convert|520|ly|pc|abbr=off|lk=on}} from the Earth.

The spectrum of this star matches a stellar classification of B5 III, which indicates it is a giant star that has evolved away from the main sequence after exhausting the hydrogen at its core. It has about seven times the Sun's mass and has an estimated age of 6.8 million years. The effective temperature of the outer envelope is 14,890 K, with the energy being emitted at this temperature giving it the blue-white hue that is a characteristic of a B-type star. It is rotating rapidly with a projected rotational velocity of 190 km s⁻¹, which gives a lower bound for the actual azimuthal velocity along the star's equator.

This is most probably a binary star and may be a triple star system. It has an optical companion with an apparent magnitude of +6.17 at an angular separation of 0.330 arcseconds and a position angle of 221°, but it is uncertain whether this is an optical double star or a gravitationally bound companion. The star has also been categorized as a spectroscopic binary, indicating that it has an orbiting companion that has not been separately resolved with a telescope. Finally, this star may be a member of the Melotte 20 open cluster, which would make it the second-brightest member after Mirfak.

Observation with the IRAS shows an extended, ring-like feature that may be a bow wave driven by radiation pressure from the star, rather than a bubble being generated by the stellar wind. This feature has an angular size of 15 × 25 arcminutes and a peak temperature of 38 K. It has an estimated peculiar velocity of more than 30 km s⁻¹, making it a runaway star.

Name and etymology

This star, together with ψ Per, σ Per, α Per, γ Per and η Per, has been called the Segment of Perseus.{{cite book

| last=Allen

| first=R. H.

| date=1963

| author-link=Richard Hinckley Allen

| title=Star Names: Their Lore and Meaning

| url=https://archive.org/details/starnamestheirlo00alle/page/331

| access-date=2012-09-04

| edition=Reprint

| publisher=Dover Publications Inc

| location=New York

| isbn=0-486-21079-0

| page=[https://archive.org/details/starnamestheirlo00alle/page/331 331]

| url-access=registration

}}

In Chinese, {{lang|zh|天船}} ({{lang|zh-Latn|Tiān Chuán}}), meaning Celestial Boat, refers to an asterism consisting of δ Persei, η Persei, α Persei, γ Persei, ψ Persei, 48 Persei, μ Persei and HD 27084. Consequently, the Chinese name for δ Persei itself is {{lang|zh|天船五}} ({{lang|zh-Latn|Tiān Chuán wu}}, {{langx|en|the Fifth Star of Celestial Boat}}.){{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 }}

References

{{reflist|30em|refs=

{{cite journal | first=F. | last=van Leeuwen |date=November 2007 | title=Validation of the new Hipparcos reduction | journal=Astronomy and Astrophysics | volume=474 | issue=2 | pages=653–664 | bibcode=2007A&A...474..653V | doi=10.1051/0004-6361:20078357 |arxiv = 0708.1752 | s2cid=18759600 }}

{{citation | last1=Evans | first1=D. S. | date=June 20–24, 1966 | editor1-last=Batten | editor1-first=Alan Henry | editor2-last=Heard | editor2-first=John Frederick | contribution=The Revision of the General Catalogue of Radial Velocities | title=Determination of Radial Velocities and their Applications, Proceedings from IAU Symposium no. 30 | volume=30 | page=57 | location=University of Toronto | publisher=International Astronomical Union | bibcode=1967IAUS...30...57E }}

{{citation | last1=Johnson | display-authors=1 | first1=H. L. | last2=Iriarte | first2=B. | last3=Mitchell | first3=R. I. | last4=Wisniewskj | first4=W. Z. | title=UBVRIJKL photometry of the bright stars | journal=Communications of the Lunar and Planetary Laboratory | volume=4 | issue=99 | date=1966 | page=99 | bibcode=1966CoLPL...4...99J }}

{{citation | display-authors=1 | last1=Zorec | first1=J. | last2=Cidale | first2=L. | last3=Arias | first3=M. L. | last4=Frémat | first4=Y. | last5=Muratore | first5=M. F. | last6=Torres | first6=A. F. | last7=Martayan | first7=C. | title=Fundamental parameters of B supergiants from the BCD system. I. Calibration of the (λ_1, D) parameters into Teff | journal=Astronomy and Astrophysics | volume=501 | issue=1 | pages=297–320 |date=July 2009 | doi=10.1051/0004-6361/200811147 | bibcode=2009A&A...501..297Z |arxiv = 0903.5134 | s2cid=14969137 }}

{{citation | last1=Abt | first1=Helmut A. | last2=Levato | first2=Hugo | last3=Grosso | first3=Monica | title=Rotational Velocities of B Stars | journal=The Astrophysical Journal | volume=573 | issue=1 | pages=359–365 |date=July 2002 | doi=10.1086/340590 | bibcode=2002ApJ...573..359A | doi-access=free }}

{{citation | last1=Tetzlaff | first1=N. | last2=Neuhäuser | first2=R. | last3=Hohle | first3=M. M. | title=A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun | journal=Monthly Notices of the Royal Astronomical Society | volume=410 | issue=1 | pages=190–200 |date=January 2011 | doi=10.1111/j.1365-2966.2010.17434.x | doi-access=free | bibcode=2011MNRAS.410..190T |arxiv = 1007.4883 | s2cid=118629873 }}

{{citation | 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 | doi=10.1111/j.1365-2966.2008.13596.x | doi-access=free | bibcode=2008MNRAS.389..869E |arxiv = 0806.2878 | s2cid=14878976 }}

{{citation | last1=Fabricius | first1=C. | last2=Makarov | first2=V. V. | title=Two-colour photometry for 9473 components of close Hipparcos double and multiple stars | journal=Astronomy and Astrophysics | volume=356 | pages=141–145 |date=April 2000 | bibcode=2000A&A...356..141F }}

{{citation | last1=van Buren | first1=Dave | last2=McCray | first2=Richard | title=Bow shocks and bubbles are seen around hot stars by IRAS | journal=Astrophysical Journal Letters | volume=329 | pages=L93–L96 |date=June 1988 | doi=10.1086/185184 | bibcode=1988ApJ...329L..93V | doi-access=free }}

{{citation | last1=van Buren | first1=Dave | last2=Noriega-Crespo | first2=Alberto | last3=Dgani | first3=Ruth | title=An IRAS/ISSA Survey of Bow Shocks Around Runaway Stars | journal=Astronomical Journal | volume=110 | page=2914 |date=December 1995 | doi=10.1086/117739 | bibcode=1995AJ....110.2914V | doi-access=free }}

{{citation | title=V* del Per -- Variable Star | work=SIMBAD | publisher=Centre de Données astronomiques de Strasbourg | url=http://simbad.u-strasbg.fr/simbad/sim-id?Ident=Delta+Persei | access-date=2012-01-06 }}

{{citation |title=The Colour of Stars |date=December 21, 2004 |work=Australia Telescope, Outreach and Education |publisher=Commonwealth Scientific and Industrial Research Organisation |url=http://outreach.atnf.csiro.au/education/senior/astrophysics/photometry_colour.html |access-date=2012-01-16 |url-status=dead |archive-url=https://web.archive.org/web/20120318151427/http://outreach.atnf.csiro.au/education/senior/astrophysics/photometry_colour.html |archive-date=2012-03-18 }}

{{citation | display-authors=1 | last1=Underhill | first1=A. B. | last2=Divan | first2=L. | last3=Prevot-Burnichon | first3=M.-L. | last4=Doazan | first4=V. | title=Effective temperatures, angular diameters, distances and linear radii for 160 O and B stars | journal=Monthly Notices of the Royal Astronomical Society | volume=189 | pages=601–605 |date=November 1979 | issue=3 | bibcode=1979MNRAS.189..601U | doi=10.1093/mnras/189.3.601| doi-access=free }}

}}

External links

[https://web.archive.org/web/20061010124016/http://www4.airnet.ne.jp/mira/seishu/name/ha/al_thurayya.html Al-Thurayya]

Category:B-type giants

Category:Binary stars

Category:Runaway stars

Category:Alpha Persei Cluster

Category:Perseus (constellation)