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 — —

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 "Compilation of Eggen's UBV data, transformed to UBV (unpublished)".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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