R Aurigae

{{Short description|Star in the constellation Auriga}}{{distinguish|Rho Aurigae}}

{{Starbox begin

| name = R Aurigae}}

{{Starbox image

| image = 250px

| caption = The visual band light curve of R Aurigae, from AAVSO data

}}

{{Starbox observe

| epoch = J2000.0

| equinox = J2000.0 (ICRS)

| constell = Auriga

| ra = {{RA|05|17|17.6916}}

| dec = {{DEC|+53|35|10.032}}

| appmag_v=6.7 to 13.9R Aur, database entry, [http://www.sai.msu.su/groups/cluster/gcvs/gcvs/iii/iii.dat The combined table of GCVS Vols I-III and NL 67-78 with improved coordinates, General Catalogue of Variable Stars] {{Webarchive|url=https://web.archive.org/web/20170620004609/http://www.sai.msu.su/groups/cluster/gcvs/gcvs/iii/iii.dat |date=2017-06-20 }}, Sternberg Astronomical Institute, Moscow, Russia. Accessed on line November 10, 2009.

}}

{{Starbox character

| class = M7IIIe{{cite journal |bibcode=1994IBVS.4058....1S |title=Photometry of Stars in the Field of R Aurigae |last1=Skiff |first1=B. A. |journal=Information Bulletin on Variable Stars |year=1994 |volume=4058 |page=1 }} {{nowrap|(M6e - M9e)}}

| u-b = +0.27[http://webviz.u-strasbg.fr/viz-bin/VizieR-5?-out.add=.&-source=V/50/catalog&recno=1707 HR 1707], database entry, The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version), D. Hoffleit and W. H. Warren, Jr., CDS ID [http://vizier.u-strasbg.fr/viz-bin/Cat?V/50 V/50]. Accessed on line November 10, 2009.

| b-v = +1.66

| variable = Mira

}}

{{Starbox astrometry

| radial_v = 7.8 ± 2

| prop_mo_ra = 14.708

| prop_mo_dec = −14.685

| parallax = 3.4958

| p_error = 0.1327

| parallax_footnote = {{cite Gaia EDR3|266367210206027776}}

| absmag_v=

}}

{{Starbox detail

| temperature = 2,385{{cite journal

| 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 }}

| luminosity = 11,530

| radius = 300[http://webviz.u-strasbg.fr/viz-bin/VizieR-5?-out.add=.&-source=II/224/cadars.dat&recno=2321 HD 34019], database entry, Catalog of Apparent Diameters and Absolute Radii of Stars (CADARS), 3rd edition, L. E. Pasinetti-Fracassini, L. Pastori, S. Covino, and A. Pozzi, CDS ID [http://vizier.u-strasbg.fr/viz-bin/Cat?II/224 II/224]. Accessed on line November 10, 2009.

}}

{{Starbox catalog

| names=R Aur, ADS 3845 A, BD+53 882, CCDM J05173+5335A, GC 6435, HD 34019, HIP 24645, HR 1707, IDS 05092+5328 A, SAO 25112{{cite simbad|title=V* R Aur|access-date=February 24, 2021}}

}}

{{Starbox reference

| Simbad=R+Aur}}

{{Starbox end}}

R Aurigae (R Aur) is a Mira variable, a pulsating red giant star in the constellation of Auriga, at a distance of {{val|930|ul=light years}}.

In 1862 R Aurigae was found to be a variable star at Bonn Observatory. It was widely observed in the late 19th century and its spectrum was described in 1890.{{cite web |url=https://www.aavso.org/lpv-month-december-2016 |title=LPV of the Month December, 2016 |access-date=2021-02-24 }} In 1907 it appeared with its variable star designation in Annie Jump Cannon's Second Catalogue of Variable Stars.

R Aurigae has an apparent visual magnitude which varies between 6.7 and 13.9 with a period of 450 days. The light curve varies strongly from cycle to cycle, sometimes having a pronounced hump on the ascending branch and usually having rise and fall times approximately equal. The cycle period has oscillated slowly between about 450 and 465 days.

R Aurigae is catalogued as a component of a double star, with the 10th magnitude HD 233095, although the two stars are unrelated.{{cite journal |bibcode=2001AJ....122.3466M |title=The 2001 US Naval Observatory Double Star CD-ROM. I. The Washington Double Star Catalog |journal=The Astronomical Journal |volume=122 |issue=6 |pages=3466 |last1=Mason |first1=Brian D. |last2=Wycoff |first2=Gary L. |last3=Hartkopf |first3=William I. |last4=Douglass |first4=Geoffrey G. |last5=Worley |first5=Charles E. |year=2001 |doi=10.1086/323920 |doi-access=free }}