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{{short description|Star in the constellation Delphinus}}
{{Starbox begin|name=ζ Delphini}} {{Starbox begin|name=ζ Delphini}}
{{Starbox image
⚫ {{starbox observe
| image=
⚫ |constell= ]
{{Location mark
|image=Delphinus constellation map.svg|alt=|float=center|width=260
|label=|position=right
|mark=Red circle.svg|mark_width=10|mark_link=ζ Del
|x=439|y=374
}}
|caption=Location of ζ Delphini (circled)
}}
⚫ {{Starbox observe
|epoch=] |epoch=]
⚫ |constell=]
⚫ |ra= {{RA|20|35|18.53563}}<ref name=SIMBAD/>
|ra={{RA|20|35|18.53563}}<ref name=HIP>{{cite journal|title=Validation of the new Hipparcos reduction|url=http://www.aanda.org/index.php?option=com_article&access=bibcode&Itemid=129&bibcode=2007A%2526A...474..653VFUL|author1=van Leeuwen, F.|display-authors=etal|journal=Astronomy and Astrophysics|volume=474|issue=2|pages=653–664|date=2007|arxiv=0708.1752|bibcode=2007A&A...474..653V|doi=10.1051/0004-6361:20078357|s2cid = 18759600}}</ref>
|dec= {{DEC|+14|40|27.1675}}<ref name=SIMBAD/>
⚫ |dec={{DEC|+14|40|27.1675}}<ref name=HIP/>
|appmag_v=+4.647<ref name=TYC2>{{cite journal|title=The Tycho-2 catalogue of the 2.5 million brightest stars|author1=Høg, E.|display-authors=etal|date=2000|journal=Astronomy and Astrophysics|volume=355|pages=L27–L30|bibcode=2000A&A...355L..27H}}</ref>
}} }}
{{Starbox character {{Starbox character
|class=A3Va / L5<ref name=vast/>
|type= A3V<ref name=SIMBAD>SIMBAD, (accessed 9 September 2012)</ref>
|b-v=+0.105<ref name=EgUBV>{{cite journal|author1=Mermilliod, J.-C.|title=Compilation of Eggen's UBV data, transformed to UBV (unpublished)|journal=Catalogue of Eggen's UBV Data|url=http://cdsads.u-strasbg.fr/cgi-bin/nph-bib_query?1986EgUBV........0M&db_key=AST&nosetcookie=1|date=1986|bibcode= 1986EgUBV........0M }}</ref>
|u-b=+0.14<ref name=EgUBV/>
|variable=
}}
{{Starbox astrometry
|radial_v=&minus;25 ± 2<ref name=GCRV>{{cite journal|title=General catalogue of stellar radial velocities|journal=Washington|author=Wilson, Ralph Elmer|date=1953|bibcode=1953GCRV..C......0W}}</ref>
|prop_mo_ra=45.52<ref name=HIP/>
|prop_mo_dec=11.74<ref name=HIP/>
|parallax=14.82
|p_error=0.23
|parallax_footnote=<ref name=HIP/>
|absmag_bol=0.523 / 14.59<ref name=vast/>
}} }}
{{Starbox detail {{Starbox detail
|source=<ref name=vast>{{cite journal|bibcode=2014MNRAS.445.3694D|arxiv=1410.0005|title=The VAST Survey - IV. A wide brown dwarf companion to the A3V star ζ Delphini|journal=Monthly Notices of the Royal Astronomical Society|volume=445|issue=4|pages=3694|last1=De Rosa|first1=R. J.|last2=Patience|first2=J.|last3=Ward-Duong|first3=K.|last4=Vigan|first4=A.|last5=Marois|first5=C.|last6=Song|first6=I.|last7=MacIntosh|first7=B.|last8=Graham|first8=J. R.|last9=Doyon|first9=R.|last10=Bessell|first10=M. S.|last11=Lai|first11=O.|last12=McCarthy|first12=D. W.|last13=Kulesa|first13=C.|year=2014|doi=10.1093/mnras/stu2018|doi-access=free |s2cid=34066734}}</ref>
⚫ | mass = 2.5 ± 0.2
|component1=ζ Del A
| radius = 2.0
⚫ |mass=2.5 ± 0.2
| luminosity = 85 |luminosity=48.63 ± 1.66
| temperature = 8336 |temperature=8336
⚫ | metal_fe =
| gravity = |gravity=3.72
⚫ |metal_fe=&minus;0.05
| rotational_velocity =
|age_myr=525 ± 125
|component2=ζ Del B
|mass_mj2=55 ± 10
|luminosity2=0.00012 ± 0.00001
|temperature2={{val|1550|+250|-100}}
|gravity2={{val|5.0|+0.5|-1.0}}
|age_myr2=525 ± 125
}} }}
{{Starbox catalog {{Starbox catalog
|names=]&nbsp;Del, ]&nbsp;196180, ]&nbsp;101589, ]&nbsp;7871, ]+14&deg;&nbsp;4353, ]&nbsp;106274 |names= ], ]+14°4353, ]&nbsp;196180, ]&nbsp;101589, ]&nbsp;7871, ]&nbsp;106274<ref name=SIMBAD>{{cite simbad|title=zet+Del|access-date=5 March 2017}}</ref>
}}
⚫ {{Starbox reference
|Simbad=zet+Del|sn=ζ Del
|Simbad2=zet+Del+B|sn2=ζ Del B
}} }}
⚫ {{Starbox reference|Simbad=zet+Del}}
{{Starbox end}} {{Starbox end}}
'''Zeta Delphini''' ('''ζ Delphini''') is a ] in the ] of ]. With an apparent magnitude of about 4.6,<ref name=TYC2/> it is faintly visible to the naked eye. ] measurements of the system made by the ] ] put it at a distance of about 220 ]s, or 67 ]s.<ref name=HIP/>


Zeta Delphini has a spectral type of A3V, implying it is an ].<ref name=vast/> These types of stars are bluish-white colored, and have ]s between 7100 and 11500 ]:<ref>{{cite journal|title=The physical properties of normal A stars|author=Adelman, Saul J.|journal=Proceedings of the International Astronomical Union|volume=2004|pages=1–11|date=2004|bibcode=2004IAUS..224....1A|doi=10.1017/S1743921304004314|doi-access=free}}</ref> Zeta Delphini has a temperature of 8336 K.<ref name=vast/> Its age is estimated to be around 500 million years, considerably younger than the Sun.<ref name=vast/>
'''Zeta Delphini''' ('''ζ Del''') is a ] in the ] ]. Its ] is 4.66. It has a ] companion within 910 AU of the main star. <ref>http://arxiv.org/abs/1410.0005</ref>


In 2014, the discovery of a ] around Zeta Delphini was announced. Zeta Delphini B is a brown dwarf with a ] of L5 (but may be from L3 to L7), and has a mass of about 55 ]s. At over 13 ]s away, this brown dwarf is separated at least 910 ] from Zeta Delphini.<ref name=vast/>
Zeta Delphini B — ] (L5±2, 50±15 mass ], 13"=910±14 AU).<ref></ref>


==References== ==References==
{{reflist}} {{reflist}}


== Links == ==External links==
* *{{cite journal|bibcode=2012A&A...537A.120Z|title=Rotational velocities of A-type stars. IV. Evolution of rotational velocities|journal=Astronomy & Astrophysics|volume=537|pages=A120|last1=Zorec|first1=J.|last2=Royer|first2=F.|year=2012|doi=10.1051/0004-6361/201117691|arxiv = 1201.2052 |s2cid=55586789}}

{{Stars of Delphinus}} {{Stars of Delphinus}}


{{DEFAULTSORT:Zeta Delphini}}
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{{main-star-stub}}

Latest revision as of 09:57, 22 August 2024

Star in the constellation Delphinus
ζ Delphini
Location of ζ Delphini (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Delphinus
Right ascension 20 35 18.53563
Declination +14° 40′ 27.1675″
Apparent magnitude (V) +4.647
Characteristics
Spectral type A3Va / L5
U−B color index +0.14
B−V color index +0.105
Astrometry
Radial velocity (Rv)−25 ± 2 km/s
Proper motion (μ) RA: 45.52 mas/yr
Dec.: 11.74 mas/yr
Parallax (π)14.82 ± 0.23 mas
Distance220 ± 3 ly
(67 ± 1 pc)
Absolute bolometric
magnitude (Mbol)		0.523 / 14.59
Details
ζ Del A
Mass2.5 ± 0.2 M☉
Luminosity48.63 ± 1.66 L☉
Surface gravity (log g)3.72 cgs
Temperature8336 K
Metallicity −0.05 dex
Age525 ± 125 Myr
ζ Del B
Mass55 ± 10 MJup
Luminosity0.00012 ± 0.00001 L☉
Surface gravity (log g)5.0+0.5
−1.0 cgs
Temperature1550+250
−100 K
Age525 ± 125 Myr
Other designations
4 Delphini, BD+14°4353, HD 196180, HIP 101589, HR 7871, SAO 106274
Database references
SIMBADζ Del
ζ Del B

Zeta Delphini (ζ Delphini) is a star in the constellation of Delphinus. With an apparent magnitude of about 4.6, it is faintly visible to the naked eye. Parallax measurements of the system made by the Hipparcos spacecraft put it at a distance of about 220 light-years, or 67 parsecs.

Zeta Delphini has a spectral type of A3V, implying it is an A-type main-sequence star. These types of stars are bluish-white colored, and have effective temperatures between 7100 and 11500 K: Zeta Delphini has a temperature of 8336 K. Its age is estimated to be around 500 million years, considerably younger than the Sun.

In 2014, the discovery of a brown dwarf around Zeta Delphini was announced. Zeta Delphini B is a brown dwarf with a spectral type of L5 (but may be from L3 to L7), and has a mass of about 55 Jupiters. At over 13 arcseconds away, this brown dwarf is separated at least 910 AU from Zeta Delphini.

References

  1. ^ van Leeuwen, F.; et al. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. S2CID 18759600.
  2. ^ Høg, E.; et al. (2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27 – L30. Bibcode:2000A&A...355L..27H.
  3. ^ De Rosa, R. J.; Patience, J.; Ward-Duong, K.; Vigan, A.; Marois, C.; Song, I.; MacIntosh, B.; Graham, J. R.; Doyon, R.; Bessell, M. S.; Lai, O.; McCarthy, D. W.; Kulesa, C. (2014). "The VAST Survey - IV. A wide brown dwarf companion to the A3V star ζ Delphini". Monthly Notices of the Royal Astronomical Society. 445 (4): 3694. arXiv:1410.0005. Bibcode:2014MNRAS.445.3694D. doi:10.1093/mnras/stu2018. S2CID 34066734.
  4. ^ Mermilliod, J.-C. (1986). "Compilation of Eggen's UBV data, transformed to UBV (unpublished)". Catalogue of Eggen's UBV Data. Bibcode:1986EgUBV........0M.
  5. Wilson, Ralph Elmer (1953). "General catalogue of stellar radial velocities". Washington. Bibcode:1953GCRV..C......0W.
  6. "zet+Del". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 5 March 2017.
  7. Adelman, Saul J. (2004). "The physical properties of normal A stars". Proceedings of the International Astronomical Union. 2004: 1–11. Bibcode:2004IAUS..224....1A. doi:10.1017/S1743921304004314.

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