HD 196737

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HD 196737
Microscopium constellation map.svg
Red circle.svg
Location of HD 196737 (circled)
Observation data
Epoch J2000       Equinox J2000
Constellation Microscopium [1]
Right ascension 20h 40m 19.82792s [2]
Declination −33° 25′ 54.6462″ [2]
Apparent magnitude  (V)5.47±0.01 [3]
Characteristics
Evolutionary stage red giant branch [4]
Spectral type K1 III [5]
U−B color index +1.08 [6]
B−V color index +1.12 [6]
Astrometry
Radial velocity (Rv)14.2±2.8 [7] km/s
Proper motion (μ)RA: +21.953 mas/yr [2]
Dec.: +34.487 mas/yr [2]
Parallax (π)13.5581±0.0691  mas [2]
Distance 241 ± 1  ly
(73.8 ± 0.4  pc)
Absolute magnitude  (MV)+1.17 [1]
Details
Mass 1.4±0.1 [8]   M☉
Radius 11.5 [9]   R☉
Luminosity 43.7+3.1
−2.9 [10]   L☉
Surface gravity (log g)2.46±0.34 [11]   cgs
Temperature 4,681±122 [12]   K
Metallicity [Fe/H]−0.02 [13]   dex
Rotational velocity (v sin i)<1 [14]  km/s
Age 3.4±0.6 [8]   Gyr
Other designations
13 G. Microscopii [15] , CD−33°15119, CPD−33°5922, FK5 1540, GC 28776, HD 196737, HIP 102014, HR 7893, SAO 212333 [16]
Database references
SIMBAD data

HD 196737, also designated as HR 7893, is a solitary orange hued star [17] located in the southern constellation of Microscopium. It has an apparent magnitude of 5.47, [3] allowing it to be faintly visible to the naked eye. The object is located relatively close at a distance of 241 light years based on Gaia DR3 parallax measurements, [2] but is receding with a heliocentric radial velocity of 14.2  km/s . [7] At its current distance, HD 196737's brightness is diminished by 0.14 magnitudes due to interstellar dust. [18] It has an absolute magnitude of 1.17. [1]

This is an evolved giant star with a stellar classification of K1 III. [5] HD 196737 is estimated to be 3.4 billion years old based on asteroseismologic measurements, [8] enough for it to cool and expand onto the red giant branch; it is now fusing a hydrogen shell around an inert helium core. [4] It has 1.4 time the mass of the Sun [8] and an enlarged radius of 11.5  R☉. [9] It radiates 43.7 times the luminosity of the Sun [10] from its photosphere at an effective temperature of 4,681  K . [12] HD 196737 has a solar metallicity — what astronomers dub chemical elements heavier than helium. The star has a projected rotational velocity too low to be measured accurately. [14]

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 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 Jones, M. I.; Jenkins, J. S.; Rojo, P.; Melo, C. H. F. (December 2011). "Study of the impact of the post-MS evolution of the host star on the orbits of close-in planets: I. Sample definition and physical properties⋆⋆⋆". Astronomy & Astrophysics. 536: A71. arXiv: 1110.6459 . Bibcode:2011A&A...536A..71J. doi: 10.1051/0004-6361/201117887 . ISSN   0004-6361.
  5. 1 2 Houk, N. (1982). Michigan Catalogue of Two-dimensional Spectral Types for the HD stars. Volume III: Declinations −40° to −26°. Bibcode:1982mcts.book.....H.
  6. 1 2 Oja, T. (1970). "UBV-Fotometri danska Tel (ESO)". Private Communication: 0. Bibcode:1970Priv.........0O.
  7. 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.
  8. 1 2 3 4 Aguirre, Víctor Silva; et al. (29 January 2020). "Detection and Characterization of Oscillating Red Giants: First Results from the TESS Satellite". The Astrophysical Journal. 889 (2): L34. arXiv: 1912.07604 . Bibcode:2020ApJ...889L..34S. doi: 10.3847/2041-8213/ab6443 . eISSN   2041-8213.
  9. 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.
  10. 1 2 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.
  11. ↑ 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.
  12. 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. hdl: 1721.1/124721 . S2CID   166227927.
  13. ↑ McWilliam, Andrew (December 1990). "High-resolution spectroscopic survey of 671 GK giants. I - Stellar atmosphere parameters and abundances". The Astrophysical Journal Supplement Series. 74: 1075. Bibcode:1990ApJS...74.1075M. doi: 10.1086/191527 . eISSN   1538-4365. ISSN   0067-0049.
  14. 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.
  15. ↑ 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.
  16. ↑ "HD 196737". SIMBAD . Centre de données astronomiques de Strasbourg.
  17. ↑ Eggleton, P. P.; Tokovinin, A. A. (11 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 . eISSN   1365-2966. ISSN   0035-8711.
  18. ↑ 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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