HR 6135

HR 6135 is single[5] star in the southern constellation of Apus, less than a degree from the northern constellation border with Triangulum Australe. Its declination of minus 70° 59.4' puts it just within 20 degrees of the southern celestial pole. The star has an orange hue and is faintly visible to the naked eye with an apparent visual magnitude of 5.50,[2] making it the 12th-brightest star in the constellation. It is located at a distance of approximately 940 light years from the Sun based on parallax, but is drifting closer with a radial velocity of −9 km/s.[1] It has an absolute magnitude of −1.45.[2]

HR 6135
Observation data
Epoch J2000      Equinox J2000
Constellation Apus
Right ascension  16h 34m 19.34576s[1]
Declination −70° 59′ 17.1711″[1]
Apparent magnitude (V) 5.50[2]
Characteristics
Spectral type K0.5IIbCN1[3]
B−V color index 1.235±0.004[2]
Astrometry
Radial velocity (Rv)−9.37±0.14[1] km/s
Proper motion (μ) RA: −15.292±0.110[1] mas/yr
Dec.: +10.849±0.130[1] mas/yr
Parallax (π)3.4524 ± 0.0783[1] mas
Distance940 ± 20 ly
(290 ± 7 pc)
Absolute magnitude (MV)−1.45[2]
Details
Radius41.3+1.0
−2.8[1] R☉
Luminosity677±19[1] L☉
Temperature4,584+166
−54[1] K
Other designations
CPD−70° 2256, FK5 3306, GC 22212, HD 148488, HIP 81141, HR 6135, SAO 257409[4]
Database references
SIMBADdata

This is an aging bright giant with a stellar classification of K0.5IIbCN1,[3] where the suffix notation indicates an anomalous overabundance of cyanogen in the spectrum. It is a mild barium star, which may indicate it is on the asymptotic giant branch stage of its evolution.[6] The star has expanded to 41 times the radius of the Sun and is radiating 677 times the Sun's luminosity from its swollen photosphere at an effective temperature of 4,584 K.[1]

References
  1. Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  2. Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015.
  3. Keenan, Philip C.; McNeil, Raymond C. (1989). "The Perkins catalog of revised MK types for the cooler stars". The Astrophysical Journal Supplement Series. 71: 245. Bibcode:1989ApJS...71..245K. doi:10.1086/191373.
  4. "HD 148488". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2020-08-04.
  5. Eggleton, P. P.; Tokovinin, A. A. (September 2008). "A catalogue of multiplicity among bright stellar systems". Monthly Notices of the Royal Astronomical Society. 389 (2): 869–879. arXiv:0806.2878. Bibcode:2008MNRAS.389..869E. doi:10.1111/j.1365-2966.2008.13596.x.
  6. Gomez, A. E.; et al. (1997). "Absolute magnitudes and kinematics of barium stars". Astronomy and Astrophysics. 319: 881. Bibcode:1997A&A...319..881G.
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