66 Aurigae

{{Starbox observe

| epoch = J2000

| constell = Auriga

| ra = {{RA|07|24|08.46679}}

| dec = {{DEC|+40|40|20.5980}}

| appmag_v = 5.23

}}

{{Starbox character

| type = horizontal branch

| class = K0.5 IIIa

| b-v = {{Val|1.249|0.003}}

| u-b =

| variable =

}}

{{Starbox astrometry

| radial_v = {{Val|+22.62|0.13}}

| prop_mo_ra = −3.511

| prop_mo_dec = −20.935

| parallax = 3.7070

| p_error = 0.1684

| parallax_footnote =

| absmag_v = −2.58

}}

{{Starbox detail

| source =

| mass = 5.05

| radius = {{Val|48.05|1.66|1.36}}

| luminosity = {{Val|834.3|43.6}}

| temperature = {{Val|4475|65|75|fmt=commas}}

| metal_fe = {{Val|0.09|0.03}}

| gravity =

| rotational_velocity = 4.5

| age_myr = 107

}}

{{Starbox catalog

| names = {{odlist | F=66 Aur | BD=+40°1852 | FK5=1191 | HD=57669 | HIP=35907 | HR=2805 | SAO=41738 | GC=9850 }}

}}

{{Starbox reference

| Simbad = 66+Aur

}}

66 Aurigae is a single star located approximately 880 light years away from the Sun in the northern constellation of Auriga. It is visible to the naked eye as a faint, orange hued star with an apparent magnitude of 5.23. This object is moving further from the Earth with a heliocentric radial velocity of +22.6 km/s.

At the age of 107 million years, 66 Aurigae is an evolved giant star, most likely (98% chance) on the horizontal branch, with a stellar classification of K0.5 IIIa. Keenan and Yorka (1987) identified it as a strong–CN star, showing an excess strength of the blue CN bands in the spectrum. Having exhausted the supply of hydrogen at its core, the star has expanded to 48 times the Sun's radius. 66 Aurigae has five times the mass of the Sun and is radiating 834 times the Sun's luminosity from its swollen photosphere at an effective temperature of 4,475 K.

It was also known to be part of a much bigger constellation named Telescopium Herschelii before it was unrecognized by the International Astronomical Union (IAU).

References

{{Reflist|refs=

{{citation

| title=XHIP: An extended hipparcos compilation

| last1=Anderson | first1=E. | last2=Francis | first2=Ch.

| journal=Astronomy Letters | postscript=.

| volume=38 | issue=5 | pages=331 | year=2012

| bibcode=2012AstL...38..331A | arxiv=1108.4971

| doi=10.1134/S1063773712050015 | s2cid=119257644 }}

{{citation

| last1=Keenan | first1=Philip C. | last2=McNeil | first2=Raymond C.

| title=The Perkins Catalog of Revised MK Types for the Cooler Stars

| journal=The Astrophysical Journal Supplement Series

| volume=71 | pages=245 | year=1989 | postscript=.

| doi=10.1086/191373 | bibcode=1989ApJS...71..245K }}

{{citation

| display-authors=1 | last1=Stock | first1=S.

| last2=Reffert | first2=S. | last3=Quirrenbach | first3=A.

| title=Precise radial velocities of giant stars. X. Bayesian stellar parameters and evolutionary stages for 372 giant stars from the Lick planet search

| journal=Astronomy & Astrophysics | postscript=.

| id=A33 | pages=15 | volume=616 |date=August 2018

| bibcode=2018A&A...616A..33S | doi=10.1051/0004-6361/201833111 | arxiv=1805.04094 | s2cid=119361866 }}

{{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 | postscript=.

| bibcode=2008MNRAS.389..869E | arxiv=0806.2878 | s2cid=14878976 }}

{{citation

| display-authors=1 | last1=De Medeiros | first1=J. R.

| last2=do Nascimento | first2=J. D. Jr. | last3=Sankarankutty | first3=S.

| last4=Costa | first4=J. M. | last5=Maia | first5=M. R. G.

| title=Rotation and lithium in single giant stars

| journal=Astronomy and Astrophysics | postscript=.

| volume=363 | pages=239–243 | date=November 2000

| bibcode=2000A&A...363..239D | arxiv=astro-ph/0010273 }}

{{citation

| display-authors=1 | last1=Keenan | first1=Philip C.

| last2=Yorka | first2=Sandra B. | last3=Wilson | first3=Olin C.

| title=Recognition and classification of strong-CN giants

| journal=Publications of the Astronomical Society of the Pacific

| volume=99 | pages=629–636 |date=July 1987 | postscript=.

| doi=10.1086/132025 | bibcode=1987PASP...99..629K | doi-access=free }}

}}

External links

[http://webviz.u-strasbg.fr/viz-bin/VizieR-S?HR%202805 HR 2805]
[http://aladin.u-strasbg.fr/AladinPreview?-c=07+24+08.4683%2B40+40+20.602&ident=*++66+Aur&submit=Aladin+previewer Image 66 Aurigae]

Category:K-type main-sequence stars

Category:CN stars

Category:Horizontal-branch stars

Category:Auriga

Category:Durchmusterung objects