HD 101917

Last updated
HD 101917
Chamaeleon constellation map.svg
Red circle.svg
Location of HD 101917 on the map (circled)
Observation data
Epoch J2000       Equinox J2000
Constellation Chamaeleon [1]
Right ascension 11h 42m 54.93206s [2]
Declination −79° 18′ 23.0075″ [2]
Apparent magnitude  (V)6.38±0.01 [3]
Characteristics
Evolutionary stage red giant branch [2]
Spectral type K0 III/IV [4]
U−B color index +0.59 [5]
B−V color index +0.90 [5]
Astrometry
Radial velocity (Rv)32.5±0.4 [6] km/s
Proper motion (μ)RA: +127.152 mas/yr [2]
Dec.: −11.599 mas/yr [2]
Parallax (π)17.64±0.0224  mas [2]
Distance 184.9 ± 0.2  ly
(56.69 ± 0.07  pc)
Absolute magnitude  (MV)+2.69 [1]
Details
Mass 1.26 [7]   M☉
Radius 4.01±0.20 [8]   R☉
Luminosity 9.04±0.03 [2]   L☉
Surface gravity (log g)3.32±0.06 [9]   cgs
Temperature 5,076±19 [9]   K
Metallicity [Fe/H]−0.11±0.02 [9]   dex
Rotational velocity (v sin i)<1.4 [10]  km/s
Age 3.87+0.41
−0.42 [2]   Gyr
Other designations
34 G. Chamaeleontis [11] , CD−78°476, CPD−78°677, GC 16083, HD 101917, HIP 57137, HR 4509, SAO 256865 [12]
Database references
SIMBAD data

HD 101917, also designated as HR 4509, or rarely 34 G. Chamaeleontis, [11] is a solitary star located in the southern circumpolar constellation Chamaeleon. It has an apparent magnitude of 6.38, [3] placing it near the limit for naked eye visibility. The object is located relatively close at a distance of 185 light years based on Gaia DR3 parallax measurements [2] but is receding with a heliocentric radial velocity of 33  km/s . [6] At its current distance, HD 101917's brightness is diminished by 0.28 magnitudes due to interstellar dust. [13] It has an absolute magnitude of +2.69. [1]

HD 101917 has a stellar classification of K0 III/IV, [4] indicating that it is an evolved K-type star with the blended luminosity class of a subgiant and a giant star. Gaia DR3 models it to be 3.9 billion years old, [2] enough time for it to cool and expand to 4.01 times the radius of the Sun. [8] At present it has 126% the mass of the Sun [7] and now radiates 9.04 times the luminosity of the Sun from its enlarged photosphere at an effective temperature 5,076  K , [9] giving it a yellow hue. HD 101917 has an iron abundance 22% below solar levels, [9] making it slightly metal deficient. It spins slowly with a projected rotational velocity lower than 1.4  km/s . [10]

References

  1. 1 2 3 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 9 10 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 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.
  8. 1 2 Kervella, P.; Thévenin, F.; Di Folco, E.; Ségransan, D. (October 2004). "The angular sizes of dwarf stars and subgiants". Astronomy & Astrophysics. 426 (1): 297–307. arXiv: astro-ph/0404180 . Bibcode:2004A&A...426..297K. doi: 10.1051/0004-6361:20035930 . eISSN   1432-0746. ISSN   0004-6361.
  9. 1 2 3 4 5 Hojjatpanah, S.; et al. (September 2019). "Catalog for the ESPRESSO blind radial velocity exoplanet survey". Astronomy & Astrophysics. 629: A80. arXiv: 1908.04627 . Bibcode:2019A&A...629A..80H. doi: 10.1051/0004-6361/201834729 . eISSN   1432-0746. ISSN   0004-6361.
  10. 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.
  11. 1 2 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.
  12. ↑ "HD 101917". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved January 10, 2023.
  13. ↑ Gontcharov, George A.; Mosenkov, Aleksandr V. (28 September 2017). "Verifying reddening and extinction for Gaia DR1 TGAS main sequence stars". Monthly Notices of the Royal Astronomical Society. 472 (4): 3805–3820. arXiv: 1709.01160 . Bibcode:2017MNRAS.472.3805G. doi: 10.1093/mnras/stx2219 . eISSN   1365-2966. ISSN   0035-8711.
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