HD 98617

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HD 98617
Chamaeleon constellation map.svg
Red circle.svg
Location of HD 98617 on the map (circled)
Observation data
Epoch J2000       Equinox J2000
Constellation Chamaeleon
Right ascension 11h 18m 34.40370s [1]
Declination −79° 40′ 07.1370″ [1]
Apparent magnitude  (V)6.35±0.01 [2]
Characteristics
Evolutionary stage main sequence [1]
Spectral type A8 IIIm: [3]
U−B color index +0.08 [4]
B−V color index +0.26 [4]
Astrometry
Radial velocity (Rv)−4±2.1 [5]  km/s
Proper motion (μ)RA: +46.293  mas/yr [1]
Dec.: −37.910  mas/yr [1]
Parallax (π)15.7985 ± 0.069  mas [1]
Distance 206.4 ± 0.9  ly
(63.3 ± 0.3  pc)
Absolute magnitude  (MV)+2.42 [6]
Details
Mass 1.75±0.07 [7]   M☉
Radius 1.85±0.06 [8]   R☉
Luminosity 8.41 [9]   L☉
Surface gravity (log g)4.20±0.04 [7]   cgs
Temperature 7,540±276 [10]   K
Metallicity [Fe/H]−0.03 [11]   dex
Age 1.06 [11]   Gyr
Other designations
30 G. Chamaeleontis [12] , CD−78°457, CPD−78°638, FK5  2904, GC  15572, HD  98617, HIP  55225, HR  4385, SAO  256823, WDS J11186-7940AB [13]
Database references
SIMBAD data

HD 98617, also known HR 4385, is a double star located in the southern circumpolar constellation Chamaeleon. The system has a combined apparent magnitude of 6.35, [2] placing it near the limit for naked eye. The system is located relatively close at a distance of 206 light years [1] but is approaching the Solar System with a fairly constrained radial velocity of −4  km/s . [5] At its current distance, HD 98617 brightness is diminished by 0.29 magnitudes due to interstellar dust. [14]

The system's nature as a double star was first observed in a 1991 Hipparcos multiplicity survey. Their current separation is six-tenths of an arcsecond, making it difficult to measure the properties of the individual components. Nevertheless, the 10th magnitude companion is located along a position angle of 237° as of 2018. [15]

The primary has a stellar classification of A8 IIIm:, indicating that it is an evolved Am star (with uncertainty). [3] However, Renson and Manfroid (2009) lists its chemical peculiarity to be doubtful. [16] It has 1.75 times the mass of the Sun [7] and 1.85 times its girth. [8] It radiates 8.41 times the luminosity of the Sun [9] from its photosphere at an effective temperature of 7,540  K , [10] giving it a white hue. It is estimated to be a billion years old and has a solar metallicity. [11] The aforementioned parameters belong to an A-type main-sequence star instead of a giant star and Gaia DR3 even models it as such. [1]

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<span class="mw-page-title-main">HD 201772</span> Star in the constellation Microscopium

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<span class="mw-page-title-main">HD 196737</span> K-type giant; Microscopium

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<span class="mw-page-title-main">HD 204018</span> Visual binary in Microscopium

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<span class="mw-page-title-main">HD 177406</span> Star in the constellation of Telescopium

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References

  1. 1 2 3 4 5 6 7 8 Vallenari, A.; et al. (Gaia Collaboration) (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics . arXiv: 2208.00211 . doi: 10.1051/0004-6361/202243940 . Gaia DR3 record for this source at VizieR.
  2. 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.
  3. 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.
  4. 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.
  5. 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.
  6. ↑ Anderson, E.; Francis, Ch. (May 2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331–346. arXiv: 1108.4971 . Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. eISSN   1562-6873. ISSN   1063-7737. S2CID   119257644.
  7. 1 2 3 Allende Prieto, C.; Lambert, D. L. (December 1999). "Fundamental parameters of nearby stars from the comparison with evolutionary calculations: masses, radii and effective temperatures". Astronomy and Astrophysics. 352: 555–562. arXiv: astro-ph/9911002 . Bibcode:1999A&A...352..555A. ISSN   0004-6361.
  8. 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.
  9. 1 2 Chandler, Colin Orion; McDonald, Iain; Kane, Stephen R. (17 February 2016). "The Catalog of Earth-Like Exoplanet Survey Targets (CELESTA): A Database of Habitable Zones Around Nearby Stars". The Astronomical Journal. 151 (3): 59. arXiv: 1510.05666 . Bibcode:2016AJ....151...59C. doi: 10.3847/0004-6256/151/3/59 . eISSN   1538-3881.
  10. 1 2 Bai, Yu; Liu, JiFeng; Bai, ZhongRui; Wang, Song; Fan, DongWei (2 August 2019). "Machine-learning Regression of Stellar Effective Temperatures in the Second Gaia Data Release". The Astronomical Journal. 158 (2): 93. arXiv: 1906.09695 . Bibcode:2019AJ....158...93B. doi: 10.3847/1538-3881/ab3048 . eISSN   1538-3881.
  11. 1 2 3 Gontcharov, G. A. (December 2012). "Dependence of kinematics on the age of stars in the solar neighborhood". Astronomy Letters. 38 (12): 771–782. arXiv: 1606.08814 . Bibcode:2012AstL...38..771G. doi: 10.1134/S1063773712120031 . eISSN   1562-6873. ISSN   1063-7737.
  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 98617". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved October 19, 2022.
  14. ↑ 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.
  15. ↑ Mason, Brian D.; Wycoff, Gary L.; Hartkopf, William I.; Douglass, Geoffrey G.; Worley, Charles E. (December 2001). "The 2001 US Naval Observatory Double Star CD-ROM. I. The Washington Double Star Catalog". The Astronomical Journal. 122 (6): 3466–3471. Bibcode:2001AJ....122.3466M. doi: 10.1086/323920 . ISSN   0004-6256.
  16. ↑ Renson, P.; Manfroid, J. (19 March 2009). "Catalogue of Ap, HgMn and Am stars". Astronomy & Astrophysics. 498 (3): 961–966. Bibcode:2009A&A...498..961R. doi: 10.1051/0004-6361/200810788 . eISSN   1432-0746. ISSN   0004-6361.
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