Upsilon Coronae Borealis

{{Starbox begin

| name= υ Coronae Borealis

}}

{{Starbox image

| image=

{{Location mark

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

|label=|position=right

|mark=Red circle.svg|mark_width=10|mark_link=υ CrB

|x=250|y=540

}}

|caption=Location of υ Coronae Borealis (circled)

}}

{{Starbox observe

| epoch = J2000.0

| equinox = J2000.0 (ICRS)

| constell = Corona Borealis

| ra = {{RA|16|16|44.78710}}

| dec = {{DEC|+29|09|00.9382}}

| appmag_v = 5.78

}}

{{Starbox character

| class = A3V

| b-v = +0.07

| u-b = +0.10

| variable =

}}

{{Starbox astrometry

| radial_v = {{Val|0.8|1.0}}

| prop_mo_ra = +23.672

| prop_mo_dec = −16.546

| parallax = 5.2987

| p_error = 0.0347

| parallax_footnote =

| absmag_v = −0.72

}}

{{Starbox detail

| mass = {{Val|3.06|0.19}}

| radius = 5.6

| luminosity = 151

| temperature = 8,098

| gravity = 3.8

| metal_fe = −0.65

| rotational_velocity = 112

| age_myr = 407

}}

{{Starbox catalog

| names = {{odlist | B=υ CrB | F=18 Coronae Borealis | BD=+29°2803 | FK5=3287 | HD=146738 | HIP=79757 | HR=6074 | SAO=84281 | NSV=7596 | WDS=J16167+2909 }}

}}

{{Starbox reference

| Simbad = ups+CrB

}}

Upsilon Coronae Borealis, Latinized from υ Coronae Borealis, is a solitary star in the northern constellation of Corona Borealis. It is a white-hued star that is dimly visible to the naked eye with an apparent visual magnitude of 5.78. The distance to this object is approximately {{convert|616|ly|pc|abbr=off|lk=on}} based on parallax.

This is an A-type main-sequence star with a stellar classification of A3V; a star that is currently fusing its core hydrogen. However, Palmer et al. (1968) had it classed as type A2IV, and thus it may be near or past its main sequence lifetime. It is a suspected variable star of unknown type that has been measured ranging in brightness from magnitude 5.78 down to 5.88.

Upsilon Coronae Borealis has three times the mass of the Sun and about six times the Sun's radius. It is spinning with a projected rotational velocity of 112 km/s. The star is radiating 151 times the luminosity of the Sun from its photosphere at an effective temperature of 8,098 K. At an age of 407 million years, it is thought to be right at the end of its main sequence life.

References

{{reflist|refs=

{{citation |postscript=. |bibcode=2012AstL...38..771G |title=Dependence of kinematics on the age of stars in the solar neighborhood |last1=Gontcharov |first1=G. A. |journal=Astronomy Letters |date=2012 |volume=38 |issue=12 |page=771 |doi=10.1134/S1063773712120031 |arxiv=1606.08814 }}

{{citation |postscript=. |bibcode=2023ApJS..268....4F |title=Variability Catalog of Stars Observed during the TESS Prime Mission |last1=Fetherolf |first1=Tara |last2=Pepper |first2=Joshua |last3=Simpson |first3=Emilie |last4=Kane |first4=Stephen R. |last5=Močnik |first5=Teo |last6=English |first6=John Edward |last7=Antoci |first7=Victoria |last8=Huber |first8=Daniel |last9=Jenkins |first9=Jon M. |last10=Stassun |first10=Keivan |last11=Twicken |first11=Joseph D. |last12=Vanderspek |first12=Roland |last13=Winn |first13=Joshua N. |journal=The Astrophysical Journal Supplement Series |date=2023 |volume=268 |issue=1 |page=4 |doi=10.3847/1538-4365/acdee5 |doi-access=free |arxiv=2208.11721 }}

{{citation |postscript=. |bibcode=2024A&A...691A..98K |title=Transferring spectroscopic stellar labels to 217 million Gaia DR3 XP stars with SHBoost |last1=Khalatyan |first1=A. |last2=Anders |first2=F. |last3=Chiappini |first3=C. |last4=Queiroz |first4=A. B. A. |last5=Nepal |first5=S. |last6=Dal Ponte |first6=M. |last7=Jordi |first7=C. |last8=Guiglion |first8=G. |last9=Valentini |first9=M. |last10=Torralba Elipe |first10=G. |last11=Steinmetz |first11=M. |last12=Pantaleoni-González |first12=M. |last13=Malhotra |first13=S. |last14=Jiménez-Arranz |first14=Ó. |last15=Enke |first15=H. |last16=Casamiquela |first16=L. |last17=Ardèvol |first17=J. |journal=Astronomy and Astrophysics |date=2024 |volume=691 |pages=A98 |doi=10.1051/0004-6361/202451427 |arxiv=2407.06963 }}

{{citation

| title=General catalogue of variable stars: Version GCVS 5.1

| last1=Samus' | first1=N. N. | last2=Kazarovets | first2=E. V.

| last3=Durlevich | first3=O. V. | last4=Kireeva | first4=N. N.

| last5=Pastukhova | first5=E. N. | journal=Astronomy Reports

| doi=10.1134/S1063772917010085 | bibcode=2017ARep...61...80S | s2cid=125853869 }}

{{citation

| last1=Palmer | first1=D. R. | last2=Walker | first2=E. N.

| last3=Jones | first3=D. H. P. | last4=Wallis | first4=R. E.

| title=The radial velocities spectral types and projected rotational velocities of 633 bright northern A stars

| display-authors=1 | journal=Royal Observatory Bulletin

| volume=135 | page=385 | date=1968

| bibcode=1968RGOB..135..385P | postscript=. }}

{{citation | postscript=.

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

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

| journal=Astronomy and Astrophysics

| 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

| 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

| postscript=. |arxiv = 0806.2878 | s2cid=14878976 }}

{{citation

| display-authors=1 | last1=McDonald | first1=I.

| last2=Zijlstra | first2=A. A. | last3=Boyer | first3=M. L.

| title=Fundamental Parameters and Infrared Excesses of Hipparcos Stars

| journal=Monthly Notices of the Royal Astronomical Society

| volume=427 | issue=1 | pages=343–57 | date=2012

| bibcode=2012MNRAS.427..343M | arxiv=1208.2037

| doi=10.1111/j.1365-2966.2012.21873.x | doi-access=free | s2cid=118665352 | postscript=. }}

{{citation

| last1=de Bruijne | first1=J. H. J. | last2=Eilers | first2=A.-C.

| title=Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project

| journal=Astronomy & Astrophysics

| volume=546 | id=A61 | pages=14 | date=October 2012

| doi=10.1051/0004-6361/201219219 | bibcode=2012A&A...546A..61D

| arxiv=1208.3048 | s2cid=59451347 | postscript=. }}

{{citation

| display-authors=1 | last1=Royer | first1=F.

| last2=Zorec | first2=J. | last3=Gómez | first3=A. E.

| title=Rotational velocities of A-type stars. III. Velocity distributions

| journal=Astronomy and Astrophysics

| volume=463 | issue=2 | pages=671–682 | date=February 2007

| doi=10.1051/0004-6361:20065224 | bibcode=2007A&A...463..671R

| arxiv=astro-ph/0610785 | s2cid=18475298 | postscript=. }}

{{citation | display-authors=1

| last1=Johnson | 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 | year=1966

| page=99 | bibcode=1966CoLPL...4...99J | postscript=. }}

{{cite simbad | mode=cs2 | postscript=.

| title=ups CrB

| access-date=2017-04-25 }}

}}

Category:A-type main-sequence stars

Category:Corona Borealis

Coronae Borealis, Upsilon

Category:Durchmusterung objects