13 Boötis

{{Starbox image

| image = 250px

| caption = A light curve for CF Boötis, plotted from Hipparcos data

}}

{{Starbox observe

| epoch = J2000

| constell = Boötes

| ra = {{RA|14|08|17.30243}}

| dec = {{DEC|+49|27|29.3993}}

| appmag_v = 5.29 to 5.38

}}

{{Starbox character

| type =

| class = M1.5III

| b-v = {{val|+1.637|0.010}}

| u-b = +1.92

| variable = Lb

}}

{{Starbox astrometry

| radial_v = {{val|−13.92|0.06}}

| prop_mo_ra = −58.584

| prop_mo_dec = 59.801

| parallax = 4.6635

| p_error = 0.1756

| parallax_footnote =

| absmag_v = −0.87

}}

{{Starbox detail

| mass = 0.8-2.6

| radius = {{val|74|10|12}}

| luminosity = {{val|1114|48|fmt=commas}}

| temperature = {{val|3889|379|248|fmt=commas}}

| metal_fe =

| gravity =

| rotational_velocity =

| age_gyr =

}}

{{Starbox catalog

| names = {{odlist | V=CF Boo | F=13 Boo | HR=5300 | HD=123782 | BD=+50°2047 | FK5=3124 | HIP=69068 | SAO=44905 | GC=19095 | CCDM=14082+4927 | WDS=14083+4927 }}

}}

{{Starbox reference

| Simbad = HD+123782

}}

13 Boötis is a solitary variable star in the northern constellation of Boötes, and is positioned near the western constellation border with Ursa Major. In 1977 it was given the variable star designation CF Boötis, often abbreviated CF Boo, while 13 Boötis is the star's Flamsteed designation. This star has a reddish hue and is faintly visible to the naked eye with an apparent visual magnitude that fluctuates around 5.26. It is located at a distance of approximately 700 light years from the Sun based on parallax, but is drifting closer with a radial velocity of −14 km/s.

The variability of the brightness of 13 Boötis was announced by Joel Stebbins and Charles Morse Huffer in 1928, based on observations made at Washburn Observatory. This is an aging red giant star on the asymptotic giant branch with a stellar classification of M1.5III, which is interpreted by stellar evolutionary models to mean it has exhausted the supply of hydrogen at its core then cooled and expanded off the main sequence. It is classified as a slow irregular variable of the Lb type, and its brightness has been observed to vary from +5.29 down to +5.38. The star has ~74 times the girth of the Sun and is radiating 1,114 times the Sun's luminosity from its swollen photosphere at an effective temperature of 3,889 K.

There is a magnitude 11.05 visual companion located at an angular separation of {{val|76.40|ul=arcseconds}} from the brighter star, along a position angle of 270°. This was first reported by William Herschel in 1783.

Possible planetary system

In 1991, Duquennoy & Mayor reported the possible presence of a low-mass object (of likely substellar nature) orbiting the red giant 13 Bootis. They set a minimum mass of 30 times that of Jupiter (likely a brown dwarf) and estimated an orbital period of 1.35 years. So far there has been no confirmation about the presence a substellar object.

{{OrbitboxPlanet hypothetical

| exoplanet = b

| mass = ≥30

| period = 494

| semimajor = ≥1.25

| eccentricity = 0.21

}}

References

{{Reflist|colwidth=30em|refs=

{{cite simbad

| title=* 13 Boo | access-date=25 May 2017 }}

{{cite journal

| display-authors=1 | last1=Mason | first1=B. D.

| last2=Wycoff | first2=G. L. | last3=Hartkopf | first3=W. I.

| last4=Douglass | first4=G. G. | last5=Worley | first5=C. E.

| title=The Washington Visual Double Star Catalog

| journal=The Astronomical Journal

| year=2014 | volume=122 | issue=6 | pages=3466–3471

| bibcode=2001AJ....122.3466M

| doi=10.1086/323920 | doi-access=free }}

{{cite journal

| last1=Stebbins | first1=Joel | last2=Huffer | first2=C. M.

| title=The Constancy of the Light of Red Stars | journal=Publications of the Washburn Observatory | date=1928

| volume=15 | pages=137–174 | bibcode=1928PWasO..15..137S

| url=https://articles.adsabs.harvard.edu/pdf/1928PWasO..15..137S | access-date=5 December 2024}}

{{cite journal

| last7=Perova | first7=N. B. | title=62nd Name-List of Variable Stars

| journal=Information Bulletin on Variable Stars | date=March 1977 | volume=1248 | pages=1–25

| bibcode=1977IBVS.1248....1K | url=https://ibvs.konkoly.hu/pub/ibvs/1201/1248.pdf

| access-date=5 December 2024}}

{{cite journal

| title=The HIPPARCOS and TYCHO catalogues | author=EAS

| journal=Astrometric and Photometric Star Catalogues Derived from the ESA Hipparcos Space Astrometry Mission

| publication-place=Noordwijk, Netherlands | publisher=ESA Publications Division

| year=1997 | series=ESA SP Series | volume=1200 | isbn=9290923997

| bibcode=1997HIP...C......0E

| url=https://cdsarc.cds.unistra.fr/viz-bin/ftp-index?/ftp/cats/more/HIP/cdroms/cats

| access-date=15 October 2022}}

{{cite journal

| 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

| bibcode=2008MNRAS.389..869E | arxiv=0806.2878

| doi=10.1111/j.1365-2966.2008.13596.x | doi-access=free | s2cid=14878976 }}

{{cite journal

| last=Eggen | first=Olin J.

| title=Asymptotic giant branch stars near the sun

| journal=Astronomical Journal

| volume=104 | issue=1 | date=July 1992 | pages=275–313

| doi=10.1086/116239 | bibcode=1992AJ....104..275E }}

{{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

| doi=10.1134/S1063772917010085 | s2cid=125853869

| bibcode=2017ARep...61...80S }}

{{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

| title=The Perkins catalog of revised MK types for the cooler stars

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

| journal=Astrophysical Journal Supplement Series

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

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

{{cite journal

| last1=Alvarez | first1=R. | last2=Mennessier | first2=M. -O.

| title=Determination of Miras temperatures from TiO and VO bands. Estimates of distances

| journal=Astronomy and Astrophysics

| volume=317| pages=761–768 | date=1997

| bibcode=1997A&A...317..761A }}

{{cite journal

| last1=Duquennoy | first1=A. | last2=Mayor | first2=M.

| title=Multiplicity among solar-type stars in the solar neighbourhood. II - Distribution of the orbital elements in an unbiased sample

| journal=Astronomy and Astrophysics

| volume=248 | issue=2 | pages=485–524 | date=1991

| bibcode=1991A&A...248..485D }}

{{cite journal|author1=Mermilliod, J.-C.|title=Compilation of Eggen's UBV data, transformed to UBV (unpublished)|journal=Catalogue of Eggen's UBV Data|url=http://cdsads.u-strasbg.fr/cgi-bin/nph-bib_query?1986EgUBV........0M&db_key=AST&nosetcookie=1|date=1986|bibcode= 1986EgUBV........0M}}

}}

External links

[http://webviz.u-strasbg.fr/viz-bin/VizieR-S?HR%205300 HR 5300]
[http://webviz.u-strasbg.fr/viz-bin/VizieR-S?CCDM%20J14082%2b4927A CCDM J14082+4927]
[http://aladin.u-strasbg.fr/AladinPreview?-c=V*+CF+Boo&ident=V*+CF+Boo&submit=Aladin+previewer Image 13 Boötis]
[http://bestdoubles.files.wordpress.com/2011/07/13bootes_e1834_e1843_39bootes.jpg]
[http://bestdoubles.wordpress.com/2011/07/13/beam-me-up-to-bootes-13-bootis-%CF%831834-%CF%831843-and-39-bootis]

Category:M-type giants

Category:Slow irregular variables

Category:Hypothetical planetary systems

Category:Boötes

Category:Durchmusterung objects