13 Boötis

13 Boötis, also known by its variable star designation CF Boötis, is a variable star in the constellation Boötes. It is approximately 550 light-years from Earth, based on its parallax.[1] 13 Boötis is a M-type red giant with a mean apparent magnitude of +5.26. It is classified as an irregular variable star and its brightness varies from magnitude +5.29 to +5.38.

13 Boötis
Observation data
Epoch J2000      Equinox J2000
Constellation Boötes
Right ascension  14h 08m 17.30262s[1]
Declination +49° 27′ 29.4029″[1]
Apparent magnitude (V) 5.29 - 5.38[2]
Characteristics
Spectral type M1.5III[3]
U−B color index +1.92[4]
B−V color index +1.63[4]
Variable type Lb[2]
Astrometry
Radial velocity (Rv)-13.92 ± 0.06[5] km/s
Proper motion (μ) RA: -59.57[1] mas/yr
Dec.: 60.42[1] mas/yr
Parallax (π)5.94 ± 0.25[1] mas
Distance550 ± 20 ly
(168 ± 7 pc)
Details
Mass0.8-2.6[6] M☉
Other designations
CF Boötis, HR 5300, HD 123782, BD+50°2047, FK5 3124, HIP 69068, SAO 44905, GC 19095, CCDM 14082+4927.
Database references
SIMBADdata

Possible planetary system

In 1991, Duquennoy & Mayor[7] 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.

The 13 Boötis planetary system
Companion
(in order from star)		 Mass Semimajor axis
(AU)		 Orbital period
(days)		 Eccentricity Inclination Radius
b (unconfirmed) ≥30 MJ ≥1.25 494 0.21 — —
gollark: Maybe it does work by word somehow.
gollark: > I don't have patience to mess with this much, but I was suspecting that the autogenerated "I consider it interesting" quotes on the root page above the auction give random pairs of words that are equal in His eyes.That is... interesting.
gollark: I can't believe that He likes apiogollarioforms more than semiapiosteganohazards.
gollark: It says "you." after it, thus insult.
gollark: Yes, it was an insult directed at you.

References
  1. van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. Vizier catalog entry
  2. Samus, N. N.; Durlevich, O. V.; et al. (2009). "VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)". VizieR On-line Data Catalog: B/gcvs. Originally Published in: 2009yCat....102025S. 1. Bibcode:2009yCat....102025S.
  3. "* 13 Boo". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 25 May 2017.
  4. Mermilliod, J.-C. (1986). "Compilation of Eggen's UBV data, transformed to UBV (unpublished)". Catalogue of Eggen's UBV Data. Bibcode:1986EgUBV........0M.
  5. Famaey, B.; Pourbaix, D.; Frankowski, A.; Van Eck, S.; Mayor, M.; Udry, S.; Jorissen, A. (2009). "Spectroscopic binaries among Hipparcos M giants". Astronomy and Astrophysics. 498 (2): 627. arXiv:0901.0934. Bibcode:2009A&A...498..627F. doi:10.1051/0004-6361/200810698.
  6. Alvarez & Menessier (1997). "Determination of Miras temperatures from TiO and VO bands. Estimates of distances". Astronomy and Astrophysics. 317: 761–768. Bibcode:1997A&A...317..761A.
  7. Duquennoy & Mayor (1991). "Multiplicity among solar-type stars in the solar neighbourhood. II - Distribution of the orbital elements in an unbiased sample". Astronomy and Astrophysics. 248 (2): 485–524. Bibcode:1991A&A...248..485D.
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