Theta Delphini

{{Starbox begin

|name=θ Delphini

}}

{{Starbox image

| image=

{{Location mark

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

|label=|position=right

|mark=Red circle.svg|mark_width=10|mark_link=θ Del

|x=398|y=438

}}

|caption=Location of θ Delphini (circled)

}}

{{Starbox observe

| constell = Delphinus

| epoch = J2000

| ra = {{RA|20|38|43.98644}}

| dec = {{DEC|+13|18|54.4543}}

|appmag_v = 5.69

}}

{{Starbox character

| type =

| class = K3Ib

| b-v = {{val|1.509|0.047}}

| u-b = +1.71

| variable =

}}

{{Starbox astrometry

| radial_v = {{val|−15.09|0.13}}

| prop_mo_ra = 3.068

| prop_mo_dec = −0.179

| parallax = 1.5887

| p_error = 0.0738

| parallax_footnote =

| absmag_v =

}}

{{Starbox detail

| mass = 5.69

| radius = {{val|125|u=solar radius}}
{{val|88|25}}

| luminosity = {{val|2,333|1,103|748|fmt=commas}}

| temperature = {{val|3,986|170|fmt=commas}}

| gravity = 1.3

| metal_fe = +0.22

| age_myr =

| rotational_velocity = 3.0

}}

{{Starbox catalog

| names = {{odlist | B=θ Del | F=8 Del | BD=+12°4411 | HD=196725 | HIP=101882 | SAO=106342 | HR=7892 | GC=28743 }}

}}

{{Starbox reference

| Simbad = tet+Del

}}

Theta Delphini, a name Latinized from θ Delphini, is a single star in the northern constellation of Delphinus. It has an apparent visual magnitude of about 5.7, meaning that it is just barely visible to the naked eye under excellent viewing conditions. The distance to this star is approximately 2,050 light years from the Sun based on parallax. It is drifting closer with a radial velocity of −15 km/s.

The stellar classification of Theta Delphini is K3Ib, which means it is a K-type supergiant. These types of stars form when relatively massive (10 to {{solar mass|30}}) stars like B-type main sequence stars run out of hydrogen to fuse and start cooling down. It has been described as a super-metal-rich star because of its high metallicity.

References

{{reflist|refs=

{{cite simbad

| title=tet Del | access-date=15 January 2016 }}

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| title=A catalogue of multiplicity among bright stellar systems

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| bibcode=2008MNRAS.389..869E | s2cid=14878976

| doi=10.1111/j.1365-2966.2008.13596.x | doi-access=free | arxiv=0806.2878 }}

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| s2cid=118372600

}}

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| journal=Astrophysical Journal Supplement Series

| volume=52 | pages=7–22 | date=1983

| bibcode=1983ApJS...52....7F | doi=10.1086/190856 | doi-access=free }}

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| volume=113 | pages=304 | year=1951

| bibcode=1951ApJ...113..304B | doi=10.1086/145399 }}

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| title=Local kinematics of K and M giants from CORAVEL/Hipparcos/Tycho-2 data. Revisiting the concept of superclusters

| display-authors=1 | last1=Famaey | first1=B.

| last2=Jorissen | first2=A. | last3=Luri | first3=X.

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| bibcode=2005A&A...430..165F }}

{{cite journal

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| doi=10.1002/asna.200911355 | arxiv=1003.2335

| bibcode=2010AN....331..349H | s2cid=111387483 }}

{{cite journal

| title=A Catalog of Known Galactic K-M Stars of Class I Candidate Red Supergiants in Gaia DR2

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| journal=The Astronomical Journal

| volume=158 | page=20 | year=2019

| issue=1 | arxiv=1905.03744 | bibcode=2019AJ....158...20M

| doi=10.3847/1538-3881/ab1cbd | s2cid=148571616 | doi-access=free }}

{{cite journal

| title=Observations and Atmospheric Parameters of Super-Metal-rich Candidates

| last1=Malagnini | first1=M. L. | last2=Morossi | first2=C.

| last3=Buzzoni | first3=A. | last4=Chavez | first4=M.

| display-authors=1 | journal=Publications of the Astronomical Society of the Pacific

| volume=112 | issue=777 | pages=1455 | year=2000

| doi=10.1086/317714 | doi-access=free

| bibcode=2000PASP..112.1455M }}

{{cite journal

| title=A catalog of rotational and radial velocities for evolved stars. II. Ib supergiant stars

| last1=De Medeiros | first1=J. R. | last2=Udry | first2=S.

| last3=Burki | first3=G. | last4=Mayor | first4=M.

| journal=Astronomy and Astrophysics

| volume=395 | pages=97–98 | year=2002

| doi=10.1051/0004-6361:20021214 | doi-access=free

| bibcode=2002A&A...395...97D }}

{{cite journal

| title=Grids of stellar models with rotation. I. Models from 0.8 to 120 M⊙ at solar metallicity (Z = 0.014)

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| last3=Eggenberger | first3=P. | last4=Meynet | first4=G.

| last5=Mowlavi | first5=N. | last6=Wyttenbach | first6=A.

| last7=Granada | first7=A. | last8=Decressin | first8=T.

| last9=Hirschi | first9=R. | last10=Frischknecht | first10=U.

| last11=Charbonnel | first11=C. | last12=Maeder | first12=A.

| display-authors=1 | journal=Astronomy & Astrophysics

| volume=537 | pages=A146 | year=2012

| bibcode=2012A&A...537A.146E | arxiv=1110.5049

| doi=10.1051/0004-6361/201117751 | s2cid=85458919 }}

{{cite web

| last=Allen | first=J. S.

| title=The Classification of Stellar Spectra

| website=UCL Department of Physics and Astronomy: Astrophysics Group

| url=http://www.star.ucl.ac.uk/~pac/spectral_classification.html

| access-date=1 January 2012}}

}}

Category:K-type supergiants