Beta Equulei

{{Starbox begin

| name = Beta Equulei

}}

{{Starbox observe

| epoch = J2000.0

| equinox = J2000.0 (ICRS)

| constell = Equuleus

| ra = {{RA|21|22|53.61365}}

| dec = {{DEC|+06|48|40.1125}}

| appmag_v = 5.16

}}

{{Starbox character

| type = Main sequence

| class = A3 V

| b-v = {{val|+0.064|0.003}}

| u-b = +0.10

| r-i =

| variable =

}}

{{Starbox astrometry

| radial_v = {{Val|−11.1|0.8}}

| prop_mo_ra = +53.685

| prop_mo_dec = +10.136

| parallax = 11.2696

| p_error = 0.2608

| parallax_footnote =

| absmag_v = +0.13

}}

{{Starbox detail

| source =

| mass = {{val|2.74|0.04}}

| radius = 4.02

| luminosity = 78.3

| temperature = 9,000

| gravity =

| metal_fe =

| rotational_velocity = {{Val|58.0|0.7}}

| age_myr = 600

}}

{{Starbox catalog

| names = {{odlist | B=β Equ | F=10 Equulei | BD=+06°4811 | HD=203562 | HIP=105570 | HR=8178 | SAO=126749 | WDS=21229+0649A }}

}}

{{Starbox reference

| Simbad = bet+Equ

}}

Beta Equulei, Latinized from β Equulei, is the Bayer designation for a solitary star in the northern constellation of Equuleus. It is faintly visible to the naked eye with an apparent visual magnitude of 5.16. The annual parallax shift is 11.27 mas, indicating a separation of around 289 light years from the Sun. It is drifting closer with a radial velocity of −11 km/s.

This is an ordinary A-type main sequence star with a stellar classification of A3 V. It has 2.7 times the mass of the Sun and about four times the Sun's radius. The star is around 600 million years old – 93% of the way through its main sequence lifetime – and is spinning with a projected rotational velocity of 58 km/s. It is radiating 78 times the luminosity of the Sun from its photosphere at an effective temperature of about 9,000 K. The star emits an infrared excess indicating the presence of a dusty debris disk. The mean temperature of the dust is 85 K, indicating the semimajor axis of its orbit is 104 AU.

β Equulei has four optical companions. They are not physically associated with the star described above.

References

{{reflist|refs=

{{citation

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

| title=Rotational velocities of A-type stars. IV. Evolution of rotational velocities

| journal=Astronomy & Astrophysics | postscript=.

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

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

| doi=10.1051/0004-6361/201117691 | s2cid=55586789 }}

{{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=. }}

{{citation

| display-authors=1 | last1=Mason | first1=B. D.

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| last4=Douglass | first4=G. G. | last5=Worley | first5=C. E.

| title=The Washington Visual Double Star Catalog | year=2014

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| bibcode=2001AJ....122.3466M | doi=10.1086/323920

| postscript=. | doi-access=free }}

{{citation

| last1=Gontcharov | first1=G. A.

| title=Pulkovo Compilation of Radial Velocities for 35,495 Hipparcos stars in a common system

| journal=Astronomy Letters | postscript=.

| volume=32| issue=11| pages=759–771 | date=November 2006

| doi=10.1134/S1063773706110065 | bibcode=2006AstL...32..759G |arxiv = 1606.08053 | s2cid=119231169

}}

{{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 | postscript=. }}

{{citation

| last1=Rhee | first1=Joseph H. | last2=Song | first2=Inseok

| last3=Zuckerman | first3=B. | last4=McElwain | first4=Michael

| display-authors=1 | journal=The Astrophysical Journal

| title=Characterization of Dusty Debris Disks: The IRAS and Hipparcos Catalogs

| volume=660 | issue=2 | pages=1556–1571 |date=May 2007

| doi=10.1086/509912 | bibcode=2007ApJ...660.1556R

| arxiv=astro-ph/0609555 | s2cid=11879505 | postscript=. }}

{{citation

| display-authors=1

| last1=Díaz | first1=C. G. | last2=González | first2=J. F.

| last3=Levato | first3=H. | last4=Grosso | first4=M.

| title=Accurate stellar rotational velocities using the Fourier transform of the cross correlation maximum

| journal=Astronomy & Astrophysics

| volume=531 | page=A143 |date=July 2011

| doi=10.1051/0004-6361/201016386 | bibcode=2011A&A...531A.143D

| arxiv=1012.4858 | s2cid=119286673 | postscript=. }}

{{citation

| last1=Mermilliod | first1=J.-C.

| title=Compilation of Eggen's UBV data, transformed to UBV (unpublished)

| journal=Catalogue of Eggen's UBV Data

| year=1986 | publisher=SIMBAD

| bibcode=1986EgUBV........0M | postscript=. }}

{{cite simbad

| title=bet Equ

| access-date=2017-02-17 | postscript=. }}

}}

External links

{{citation

| first1=James B. | last1=Kaler | work=Stars

| title=Beta Equulei | date=December 18, 2009

| publisher=University of Illinois | postscript=.

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

Category:Equuleus

Category:A-type main-sequence stars