Alpha Lyncis

{{Starbox begin

| name=α Lyncis

}}

{{Starbox image

| image=

{{Location mark

|image=Lynx constellation map.svg|alt=|float=center|width=240

|label=|position=right

|mark=Red circle.svg|mark_width=10|mark_link=α Lyn

|x=102|y=810

}}

|caption=Location of α Lyncis (circled)

}}

{{Starbox observe

| epoch = J2000

| ra = {{RA|09|21|03.30021}}

| dec = {{DEC|+34|23|33.2134}}

| appmag_v = +3.14{{cite journal|bibcode=2002yCat.2237....0D|title=VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system|journal=CDS/ADC Collection of Electronic Catalogues|volume=2237|last1=Ducati|first1=J. R.|year=2002}}

| constell = Lynx

}}

{{Starbox character

| type = Giant star

| class = K7 III

| b-v = +1.55

| u-b = +1.95

| variable =

}}

{{Starbox astrometry

| radial_v = 37.15

| prop_mo_ra = {{val|-218.723}}

| prop_mo_dec = {{val|16.555}}

| pm_footnote =

| parallax = 14.7

| p_error = 0.18

| parallax_footnote =

| dist_pc = {{val|67.7|0.9|0.8}}

| dist_ly = {{val|220.7|2.9|2.6}}

| dist_footnote =

| absmag_bol = {{nowrap|–2.32 ± 0.13}}

}}

{{Starbox detail

| mass ={{val|1.52|0.077}}

| radius = {{val|58.15|0.73|0.75}}

| luminosity = {{val|621.1|15.8}}

| gravity = {{val|1.06|0.04}}

| temperature = {{val|3881|20|fmt=commas}}

| metal_fe = {{val|-0.26|0.05}}

| rotational_velocity = 6.4

| age_gyr = 1.4

}}

{{Starbox catalog

| names = 40 Lyncis, HR 3705, HD 80493, BD+35°1979, HIP 45860, SAO 61414, FK5 352, NSV 4456, GC 12880

}}

{{Starbox reference

|Simbad=alf+Lyn

}}

Alpha Lyncis (α Lyn, α Lyncis) is the brightest star in the northern constellation of Lynx with an apparent magnitude of +3.13. Unusually, it is the only star in the constellation that has a Bayer designation. Based upon parallax measurements, this star is located about {{Convert|220|ly|pc|abbr=off|lk=on}} from the Earth.

Characteristics

This is a red giant star that has exhausted the hydrogen at its core and has evolved away from the main sequence. It has expanded to about 58 times the Sun's radius and it is emitting roughly 621 times the luminosity of the Sun. The estimated effective temperature of the star's outer envelope is 3,881 K, which is lower than the Sun's effective temperature of 5,778 K, and is giving Alpha Lyncis a red-orange hue that is characteristic of late K-type stars.

Alpha Lyncis is a suspected small-amplitude red variable star that changes apparent magnitude from +3.17 up to +3.12. This variability pattern typically occurs in stars that have developed an inert carbon core surrounded by a helium-fusing shell, and suggests that Alpha Lyncis is starting to evolve into a Mira variable.

References

{{reflist|30em|refs=

{{cite journal

| display-authors=1

| last1=Massarotti | first1=A.

| last2=Latham | first2=D. W.

| last3=Stefanik | first3=R. P.

| last4=Fogel | first4=J.

| year=2008

| title=Rotational and Radial Velocities for a Sample of 761 HIPPARCOS Giants and the Role of Binarity

| journal=The Astronomical Journal

| volume=135 | issue=1 | pages=209–231

| bibcode=2008AJ....135..209M

| doi=10.1088/0004-6256/135/1/209

| doi-access=free

}}

{{cite journal

| last1=Morgan | first1=W. W.

| last2=Keenan | first2=P. C.

| year=1973

| title=Spectral Classification

| journal=Annual Review of Astronomy and Astrophysics

| volume=11 | pages=29–50

| bibcode=1973ARA&A..11...29M

| doi=10.1146/annurev.aa.11.090173.000333

}}

{{cite journal

| display-authors=1

| last1=Johnson | first1=H. L.

| last2=Iriarte | first2=B.

| last3=Mitchell | first3=R. I.

| last4=Wisniewskj | first4=W. Z.

| year=1966

| title=UBVRIJKL photometry of the bright stars

| journal=Communications of the Lunar and Planetary Laboratory

| volume=4 |issue=1 | page=99

| bibcode=1966CoLPL...4...99J

}}

{{cite journal

| display-authors=1

| last1=Piau | first1=L.

| last2=Kervella | first2=P.

| last3=Dib | first3=S.

| last4=Hauschildt | first4=P.

| year=2010

| title=Surface convection and red giants radii measurements

| journal=Astronomy and Astrophysics

| volume=526 |pages=100

| arxiv=1010.3649

| bibcode=2011A&A...526A.100P

| doi=10.1051/0004-6361/201014442

| s2cid=118533297 }} For M_bol, see Table 1.

{{cite journal

| display-authors=1

| last1=Percy | first1=J. R.

| last2=Wong | first2=N.

| last3=Bohme | first3=D.

| last4=Curott | first4=D. R.

| last5=Dempsey | first5=F.

| last6=Fortier | first6=G. L.

| last7=Ganis | first7=M.

| last8=Parello | first8=S.

| last9=Landis | first9=H. J.

| year=1994

| title=Photometric surveys of suspected small-amplitude red variables. III: An AAVSO photometric photometry survey

| journal=Publications of the Astronomical Society of the Pacific

| volume=106 | issue=700 | pages=611–615

| bibcode=1994PASP..106..611P

| doi=10.1086/133420

| doi-access=free

}}

{{cite journal

| display-authors=1

| last1=Kukarkin | first1=B. V.

| last2=Kholopov | first2=P. N.

| last3=Artiukhina | first3=N. M.

| last4=Fedorovich | first4=V. P.

| last5=Frolov | first5=M. S.

| last6=Goranskij | first6=V. P.

| last7=Gorynya | first7=N. A.

| last8=Karitskaya | first8=E. A.

| last9=Kireeva | first9=N. N.

| year=1981

| title=Catalogue of suspected variable stars

| journal=Nachrichtenblatt der Vereinigung der Sternfreunde E.V.

| bibcode=1981NVS...C......0K

}}

{{Cite journal |last1=Soubiran |first1=C. |last2=Creevey |first2=O. L. |last3=Lagarde |first3=N. |last4=Brouillet |first4=N. |last5=Jofré |first5=P. |last6=Casamiquela |first6=L. |last7=Heiter |first7=U. |last8=Aguilera-Gómez |first8=C. |last9=Vitali |first9=S. |last10=Worley |first10=C. |last11=de Brito Silva |first11=D. |date=2024-02-01 |title=Gaia FGK benchmark stars: Fundamental Teff and log g of the third version |url=https://ui.adsabs.harvard.edu/abs/2024A&A...682A.145S |journal=Astronomy and Astrophysics |volume=682 |pages=A145 |doi=10.1051/0004-6361/202347136 |bibcode=2024A&A...682A.145S |issn=0004-6361}} [https://vizier.cds.unistra.fr/viz-bin/VizieR?-source=J/A%2BA/682/A145&HIP=HIP45860 Alpha Lyncis' database entry] at VizieR.

{{Cite journal |last1=Baines |first1=Ellyn K. |last2=Armstrong |first2=J. Thomas |last3=Clark |first3=James H. |last4=Gorney |first4=Jim |last5=Hutter |first5=Donald J. |last6=Jorgensen |first6=Anders M. |last7=Kyte |first7=Casey |last8=Mozurkewich |first8=David |last9=Nisley |first9=Ishara |last10=Sanborn |first10=Jason |last11=Schmitt |first11=Henrique R. |last12=Belle |first12=Gerard T. van |date=October 2021 |title=Angular Diameters and Fundamental Parameters of Forty-four Stars from the Navy Precision Optical Interferometer |journal=The Astronomical Journal |language=en |volume=162 |issue=5 |pages=198 |doi=10.3847/1538-3881/ac2431 |doi-access=free |arxiv=2211.09030 |bibcode=2021AJ....162..198B |issn=1538-3881}}

{{Cite journal|last1=Bailer-Jones|first1=C. A. L.|last2=Rybizki|first2=J.|last3=Fouesneau|first3=M.|last4=Demleitner|first4=M.|last5=Andrae|first5=R.|bibcode=2021AJ....161..147B|title=Estimating Distances from Parallaxes. V. Geometric and Photogeometric Distances to 1.47 Billion Stars in Gaia Early Data Release 3|journal=The Astronomical Journal|year=2021|volume=161|issue=3|page=147|doi=10.3847/1538-3881/abd806|arxiv=2012.05220|s2cid=228063812 |doi-access=free }} Data about this star can be seen [https://dc.zah.uni-heidelberg.de/gedr3dist/q/cone/form here].

{{cite web

| last1=Kaler | first1=J. B.

| date=May 11, 2005

| title=ALPHA LYN (Alpha Lyncis) and ALSCIAUKAT (31 Lyncis)

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

| work=Stars

| publisher=University of Illinois

| access-date=2011-12-26

}}

{{cite web

|title=The Colour of Stars

|date=December 21, 2004