:R Boötis

{{Starbox image

| image = 250px

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

}}

{{Starbox observe

| epoch = J2000

| ra = {{RA|14|37|11.57616}}

| dec = {{DEC|26|44|11.6562}}

| appmag_v = 6.0 - 13.3

| constell = Boötes

}}

{{Starbox character

| type = AGB

| class = M4-8e

| b-v = {{val|1.50|0.51}}

| u-b =

| variable = Mira variable

}}

{{Starbox astrometry

| radial_v = {{val|−58.0|4.7}}

| prop_mo_ra = –25.537

| prop_mo_dec = 11.968

| parallax = 1.5204

| p_error = 0.0586

| parallax_footnote =

| absmag_v =

}}

{{Starbox detail

| mass = 1.492

| radius = 241{{snd}}268

| luminosity = {{val|4255|1009|821|fmt=commas}}

| temperature = 3,029{{snd}}3,061

| metal_fe = +0.512

| gravity = {{val|-0.33}} or {{val|-0.25}}

| rotational_velocity =

| age_gyr =

}}

{{Starbox catalog

| names = {{odlist | V=R Boo | BD=+27°2400 | GC=19706 | HD=128609 | HIP=71490 | SAO=83440 }}

}}

{{Starbox reference

| Simbad=R+Boo

}}

R Boötis is a variable star in the northern constellation of Boötes. The star's brightness varies tremendously, ranging from apparent magnitude 6.0, when it might be faintly visible to the naked eye under very good observing conditions, to 13.3, when a fairly large telescope would be required to see it. The distance to this star is approximately {{val|2,150|fmt=commas|ul=light years}} based on parallax measurements. It is drifting closer with a radial velocity of about −58 km/s.

The variability of this star was discovered by German astronomer F. W. Argelander in 1857. It is classified as a Mira-type pulsating variable that ranges in brightness from magnitude 6.0 down to 13.3 with a period of 223.11 days. The stellar classification of the star ranges from M4e to M8e, where the 'e' indicates emission features in the spectrum.

R Boötis is much larger and luminous than the Sun, at {{val|4000|fmt=commas|u=solar luminosities}} and a size 250 times that of the Sun. It has cooled to an effective temperature of {{val|3000|fmt=commas|u=Kelvins}}, giving it a reddish hue.

References

{{Reflist|refs=

{{cite web |title=Download Data |url=https://www.aavso.org/data-download |website=aavso.org |publisher=AAVSO |access-date=1 October 2021}}

{{cite simbad

| title=R Boo | access-date=2021-05-01 }}

{{citation | title=The Colour of Stars | date=December 21, 2004 | work=Australia Telescope, Outreach and Education | publisher=Commonwealth Scientific and Industrial Research Organisation | url=http://outreach.atnf.csiro.au/education/senior/astrophysics/photometry_colour.html | accessdate=2012-01-16 | archive-date=2013-12-03 | archive-url=https://web.archive.org/web/20131203222826/http://outreach.atnf.csiro.au/education/senior/astrophysics/photometry_colour.html | url-status=dead }}

{{cite journal |bibcode=2022MNRAS.516.1881W |title=Water-maser survey towards off-plane O-rich AGBs around the orbital plane of the Sagittarius stellar stream |last1=Wu |first1=Yuanwei |last2=Zhang |first2=Bo |last3=Li |first3=Jingjing |last4=Zheng |first4=Xing-Wu |journal=Monthly Notices of the Royal Astronomical Society |date=2022 |volume=516 |issue=2 |page=1881 |doi=10.1093/mnras/stac1971 |doi-access=free |arxiv=2207.05914 }}

{{cite journal

| display-authors=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.

| title=General Catalogue of Variable Stars

| version=5.1 | journal=Astronomy Reports

| year=2017 | volume=61 | issue=1 | pages=80–88

| bibcode=2017ARep...61...80S | s2cid=125853869

| doi=10.1134/S1063772917010085 }}

{{cite journal

| title=106 Mira Stars, - I. R Ari, R Aur, X Aur, R Boo and S Boo

| last1=Isles | first1=J. E. | last2=Saw | first2=D. R. B.

| journal=Journal of the British Astronomical Association

| volume=97 | issue=2 | pages=106–116 | date=February 1987

| bibcode=1987JBAA...97..106I }}

{{cite journal

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

| title=XHIP: An extended hipparcos compilation

| journal=Astronomy Letters

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

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

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

{{Cite journal |last1=Anders |first1=F. |last2=Khalatyan |first2=A. |last3=Queiroz |first3=A. B. A. |last4=Chiappini |first4=C. |last5=Ardèvol |first5=J. |last6=Casamiquela |first6=L. |last7=Figueras |first7=F. |last8=Jiménez-Arranz |first8=Ó. |last9=Jordi |first9=C. |last10=Monguió |first10=M. |last11=Romero-Gómez |first11=M. |last12=Altamirano |first12=D. |last13=Antoja |first13=T. |last14=Assaad |first14=R. |last15=Cantat-Gaudin |first15=T. |date=2022-02-01 |title=Photo-astrometric distances, extinctions, and astrophysical parameters for Gaia EDR3 stars brighter than G = 18.5 |bibcode=2022A&A...658A..91A |journal=Astronomy and Astrophysics |volume=658 |pages=A91 |doi=10.1051/0004-6361/202142369 |arxiv=2111.01860 |issn=0004-6361}} [https://vizier.cds.unistra.fr/viz-bin/VizieR?-source=I/354 Database] at VizieR. R Boötis = (Gaia DR3) 1279554668255201152.

{{Cite journal |last=Béguin |first=E. |last2=Chiavassa |first2=A. |last3=Ahmad |first3=A. |last4=Freytag |first4=B. |last5=Uttenthaler |first5=S. |date=2024-10-01 |title=Retrieving stellar parameters and dynamics of AGB stars with Gaia parallax measurements and CO5BOLD RHD simulations |url=https://www.aanda.org/articles/aa/full_html/2024/10/aa50245-24/aa50245-24.html |journal=Astronomy & Astrophysics |language=en |volume=690 |pages=A125 |doi=10.1051/0004-6361/202450245 |doi-access=free |arxiv=2409.03422 |issn=0004-6361}}

{{cite journal

| last1=Gontcharov | first1=G. A.

| title=Pulkovo Compilation of Radial Velocities for 35495 Hipparcos stars in a common system

| journal=Astronomy Letters

| volume=32| issue=11| pages=759–771| date=November 2006

| bibcode=2006AstL...32..759G | arxiv=1606.08053

| doi = 10.1134/S1063773706110065 | s2cid=119231169

}}

{{cite journal

| title=Revised Catalog of Spectra of Mira Variables of Types ME and Se

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

| last2=Garrison | first2=Robert F. | last3=Deutsch | first3=Armin J.