Astronomy:HD 106248

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Short description: Star in the constellation Chamaeleon
HD 106248
Chamaeleon constellation map.svg
Red circle.svg
Location of HD 106248 on the map (circled)
Observation data
Epoch J2000.0   Equinox (celestial coordinates)
Constellation Chamaeleon
Right ascension  12h 13m 56.46291s[1]
Declination −78° 34′ 26.1715″[1]
Apparent magnitude (V) 6.34±0.01[2]
Characteristics
Spectral type K2/3 III CNII[3]
U−B color index +1.41[4]
B−V color index +1.21[4]
Astrometry
Radial velocity (Rv)34.5±0.4[5] km/s
Proper motion (μ) RA: −4.318[1] mas/yr
Dec.: −20.594[1] mas/yr
Parallax (π)9.1183 ± 0.0194[1] mas
Distance357.7 ± 0.8 ly
(109.7 ± 0.2 pc)
Absolute magnitude (MV)+1.10[6]
Details
Mass1.19±0.82[7] M☉
Radius10.93[8] R☉
Luminosity49+2.3−2.2[7] L☉
Surface gravity (log g)2.42[9] cgs
Temperature4,700±122[10] K
Metallicity [Fe/H]+0.05[9] dex
Rotational velocity (v sin i)<1.5[11] km/s
Age4.31+0.75−0.48[1] Gyr
Other designations
CD−77°542, CPD−77°804, GC 16698, HD 106248, HIP 59647, HR 4649, SAO 256915[12]
Database references
SIMBADdata

HD 106248, also known as HR 4649, is a solitary, orange hued star located in the southern circumpolar constellation Chamaeleon. It has an apparent magnitude of 6.34,[2] placing it near the limit for naked eye visibility. Based on parallax measurements from Gaia DR3, the object is estimated to be 358 light years away from the Solar System.[1] It appears to be receding with a heliocentric radial velocity of 34.5 km/s.[5] At its current distance, HD 106248's brightness is diminished by 0.32 due to interstellar dust and Eggen (1993) lists it as a member of the old (thick) disk population.[13]

This is an evolved red giant with a stellar classification of K2/3 III CNII[3]—intermediate between a K2 and K3 giant star. The CNII suffix indicates that it has a strong overabundance of cyano radicals in its spectrum, making it a CN star.[14] It has 119% the mass of the Sun[7] and is estimated to be 4.31 billion years old,[1] slightly younger than the Sun. However, HD 106248 has already left the main sequence and has an enlarged radius of 10.9 R☉.[8] It radiates 49 times the luminosity of the Sun from its photosphere[7] at an effective temperature of 4,700 K.[10] The star has a solar metallicity and spins slowly with a projected rotational velocity lower than 1.5 km/s.[11]

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940  Gaia DR3 record for this source at VizieR.
  2. ↑ 2.0 2.1 Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P. et al. (March 2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics 355: L27–L30. ISSN 0004-6361. Bibcode: 2000A&A...355L..27H. 
  3. ↑ 3.0 3.1 Houk, N.; Cowley, A. P. (1975). University of Michigan Catalogue of two-dimensional spectral types for the HD stars. Volume I. Declinations −90° to −53°. Bibcode: 1975mcts.book.....H. 
  4. ↑ 4.0 4.1 Johnson, H. L.; Mitchell, R. I.; Iriarte, B.; Wisniewski, W. Z. (1966). "UBVRIJKL Photometry of the Bright Stars". Communications of the Lunar and Planetary Laboratory 4: 99–110. Bibcode: 1966CoLPL...4...99J. 
  5. ↑ 5.0 5.1 Gontcharov, G. A. (November 2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters 32 (11): 759–771. doi:10.1134/S1063773706110065. ISSN 1063-7737. Bibcode: 2006AstL...32..759G. 
  6. ↑ Anderson, E.; Francis, Ch. (May 2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331–346. doi:10.1134/S1063773712050015. ISSN 1063-7737. Bibcode: 2012AstL...38..331A. 
  7. ↑ 7.0 7.1 7.2 7.3 Charbonnel, C.; Lagarde, N.; Jasniewicz, G.; North, P. L.; Shetrone, M.; Krugler Hollek, J.; Smith, V. V.; Smiljanic, R. et al. (January 2020). "Lithium in red giant stars: Constraining non-standard mixing with large surveys in the Gaia era". Astronomy & Astrophysics 633: A34. doi:10.1051/0004-6361/201936360. ISSN 0004-6361. Bibcode: 2020A&A...633A..34C. 
  8. ↑ 8.0 8.1 Kervella, Pierre; Arenou, Frédéric; Thévenin, Frédéric (2022). "Stellar and substellar companions from Gaia EDR3". Astronomy & Astrophysics 657: A7. doi:10.1051/0004-6361/202142146. ISSN 0004-6361. Bibcode: 2022A&A...657A...7K. 
  9. ↑ 9.0 9.1 Anders, F. et al. (August 2019). "Photo-astrometric distances, extinctions, and astrophysical parameters for Gaia DR2 stars brighter than G = 18". Astronomy & Astrophysics 628: A94. doi:10.1051/0004-6361/201935765. ISSN 0004-6361. Bibcode: 2019A&A...628A..94A. 
  10. ↑ 10.0 10.1 Stassun, Keivan G. et al. (9 September 2019). "The Revised TESS Input Catalog and Candidate Target List". The Astronomical Journal 158 (4): 138. doi:10.3847/1538-3881/ab3467. Bibcode: 2019AJ....158..138S. 
  11. ↑ 11.0 11.1 De Medeiros, J. R.; Alves, S.; Udry, S.; Andersen, J.; Nordström, B.; Mayor, M. (January 2014). "A catalog of rotational and radial velocities for evolved stars". Astronomy & Astrophysics 561: A126. doi:10.1051/0004-6361/201220762. ISSN 0004-6361. Bibcode: 2014A&A...561A.126D. 
  12. ↑ "HD 106248". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+106248. 
  13. ↑ Eggen, O. J. (July 1993). "Evolved GK stars near the sun. I - The old disk population". The Astronomical Journal 106: 80. doi:10.1086/116622. Bibcode: 1993AJ....106...80E. 
  14. ↑ Janes, K. A.; McClure, Robert D. (May 1971). "Strong-Cyanogen Stars: Photometry and Kinematics". The Astrophysical Journal 165: 561. doi:10.1086/150921. ISSN 0004-637X. Bibcode: 1971ApJ...165..561J. 
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