HD 106248

Last updated
HD 106248
Chamaeleon constellation map.svg
Red circle.svg
Location of HD 106248 on the map (circled)
Observation data
Epoch J2000.0        Equinox J2000.0 (ICRS)
Constellation Chamaeleon [1]
Right ascension 12h 13m 56.46291s [2]
Declination −78° 34′ 26.1715″ [2]
Apparent magnitude  (V)6.34±0.01 [3]
Characteristics
Spectral type K2/3 III CNII [4]
U−B color index +1.41 [5]
B−V color index +1.21 [5]
Astrometry
Radial velocity (Rv)34.5±0.4 [6] km/s
Proper motion (μ)RA: −4.318 mas/yr [2]
Dec.: −20.594 mas/yr [2]
Parallax (π)9.1183±0.0194  mas [2]
Distance 357.7 ± 0.8  ly
(109.7 ± 0.2  pc)
Absolute magnitude  (MV)+1.10 [1]
Details
Mass 1.19±0.82 [7]   M☉
Radius 10.93 [8]   R☉
Luminosity 49+2.3
−2.2 [7]   L☉
Surface gravity (log g)2.42 [9]   cgs
Temperature 4,700±122 [10]   K
Metallicity [Fe/H]+0.05 [9]   dex
Rotational velocity (v sin i)<1.5 [11]  km/s
Age 4.31+0.75
−0.48 [2]   Gyr
Other designations
39 G. Chamaeleontis [12] , CD−77°542, CPD−77°804, GC 16698, HD 106248, HIP 59647, HR 4649, SAO 256915 [13]
Database references
SIMBAD data

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, [3] 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. [2] It appears to be receding with a heliocentric radial velocity of 34.5  km/s . [6] 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. [14]

This is an evolved red giant with a stellar classification of K2/3 III CNII [4] —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. [15] It has 119% the mass of the Sun [7] and is estimated to be 4.31 billion years old, [2] 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 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. XHIP record for this object at VizieR.
  2. 1 2 3 4 5 6 7 8 Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv: 2208.00211 . Bibcode:2023A&A...674A...1G. doi: 10.1051/0004-6361/202243940 . S2CID   244398875. Gaia DR3 record for this source at VizieR.
  3. 1 2 Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P.; Wicenec, A. (March 2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27 –L30. Bibcode:2000A&A...355L..27H. ISSN   0004-6361.
  4. 1 2 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.
  5. 1 2 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.
  6. 1 2 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. arXiv: 1606.08053 . Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065. eISSN   1562-6873. ISSN   1063-7737. S2CID   119231169.
  7. 1 2 3 4 Charbonnel, C.; Lagarde, N.; Jasniewicz, G.; North, P. L.; Shetrone, M.; Krugler Hollek, J.; Smith, V. V.; Smiljanic, R.; Palacios, A.; Ottoni, G. (January 2020). "Lithium in red giant stars: Constraining non-standard mixing with large surveys in the Gaia era". Astronomy & Astrophysics. 633: A34. arXiv: 1910.12732 . Bibcode:2020A&A...633A..34C. doi: 10.1051/0004-6361/201936360 . eISSN   1432-0746. ISSN   0004-6361.
  8. 1 2 Kervella, Pierre; Arenou, Frédéric; Thévenin, Frédéric (2022). "Stellar and substellar companions from Gaia EDR3". Astronomy & Astrophysics. 657: A7. arXiv: 2109.10912 . Bibcode:2022A&A...657A...7K. doi: 10.1051/0004-6361/202142146 . eISSN   1432-0746. ISSN   0004-6361.
  9. 1 2 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. arXiv: 1904.11302 . Bibcode:2019A&A...628A..94A. doi: 10.1051/0004-6361/201935765 . eISSN   1432-0746. ISSN   0004-6361.
  10. 1 2 Stassun, Keivan G.; et al. (9 September 2019). "The Revised TESS Input Catalog and Candidate Target List". The Astronomical Journal. 158 (4): 138. arXiv: 1905.10694 . Bibcode:2019AJ....158..138S. doi: 10.3847/1538-3881/ab3467 . eISSN   1538-3881.
  11. 1 2 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. arXiv: 1312.3474 . Bibcode:2014A&A...561A.126D. doi: 10.1051/0004-6361/201220762 . eISSN   1432-0746. ISSN   0004-6361.
  12. ↑ Gould, Benjamin Apthorp (1878). "Uranometria Argentina : brillantez y posicion de las estrellas fijas, hasta la septima magnitud, comprendidas dentro de cien grados del polo austral : con atlas". Resultados del Observatorio Nacional Argentino. 1. Bibcode:1879RNAO....1.....G.
  13. ↑ "HD 106248". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved October 18, 2022.
  14. ↑ Eggen, O. J. (July 1993). "Evolved GK stars near the sun. I - The old disk population". The Astronomical Journal. 106: 80. Bibcode:1993AJ....106...80E. doi: 10.1086/116622 .
  15. ↑ Janes, K. A.; McClure, Robert D. (May 1971). "Strong-Cyanogen Stars: Photometry and Kinematics". The Astrophysical Journal. 165: 561. Bibcode:1971ApJ...165..561J. doi: 10.1086/150921 . eISSN   1538-4357. ISSN   0004-637X.
This page is based on this Wikipedia article
Text is available under the CC BY-SA 4.0 license; additional terms may apply.
Images, videos and audio are available under their respective licenses.