Astronomy:HD 196737

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Short description: K-type giant; Microscopium
HD 196737
Microscopium constellation map.svg
Red circle.svg
Location of HD 196737 (circled)
Observation data
Epoch J2000.0   Equinox (celestial coordinates)
Constellation Microscopium
Right ascension  20h 40m 19.82792s[1]
Declination −33° 25′ 54.6462″[1]
Apparent magnitude (V) 5.47±0.01[2]
Characteristics
Evolutionary stage red giant branch[3]
Spectral type K1 III[4]
U−B color index +1.08[5]
B−V color index +1.12[5]
Astrometry
Radial velocity (Rv)14.2±2.8[6] km/s
Proper motion (μ) RA: +21.953[1] mas/yr
Dec.: +34.487[1] mas/yr
Parallax (π)13.5581 ± 0.0691[1] mas
Distance241 ± 1 ly
(73.8 ± 0.4 pc)
Absolute magnitude (MV)+1.17[7]
Details
Mass1.4±0.1[8] M☉
Radius11.5[9] R☉
Luminosity43.7+3.1−2.9[10] L☉
Surface gravity (log g)2.46±0.34[11] cgs
Temperature4,681±122[12] K
Metallicity [Fe/H]−0.02[13] dex
Rotational velocity (v sin i)<1[14] km/s
Age3.4±0.6[8] Gyr
Other designations
CD−33°15119, CPD−33°5922, FK5 1540, GC 28776, HD 196737, HIP 102014, HR 7893, SAO 212333[15]
Database references
SIMBADdata

HD 196737, also designated as HR 7893, is a solitary orange hued star[16] located in the southern constellation Microscopium. It has an apparent magnitude of 5.47,[2] 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,[1] but is receding with a heliocentric radial velocity of 14.2 km/s.[6] At its current distance, HD 196737's brightness is diminished by 0.14 magnitudes due to interstellar dust.[17] It has an absolute magnitude of 1.17.[7]

This is an evolved giant star with a stellar classification of K1 III.[4] 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.[3] 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. ↑ 1.0 1.1 1.2 1.3 1.4 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 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. doi:10.1051/0004-6361/201117887. ISSN 0004-6361. Bibcode: 2011A&A...536A..71J. 
  4. ↑ 4.0 4.1 Houk, N. (1982). Michigan Catalogue of Two-dimensional Spectral Types for the HD stars. Volume III: Declinations −40° to −26°. Bibcode: 1982mcts.book.....H. 
  5. ↑ 5.0 5.1 Oja, T. (1970). "UBV-Fotometri danska Tel (ESO)". Private Communication: 0. Bibcode: 1970Priv.........0O. 
  6. ↑ 6.0 6.1 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. 
  7. ↑ 7.0 7.1 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. 
  8. ↑ 8.0 8.1 8.2 8.3 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. doi:10.3847/2041-8213/ab6443. Bibcode: 2020ApJ...889L..34S. 
  9. ↑ 9.0 9.1 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. doi:10.1051/0004-6361:20035930. ISSN 0004-6361. Bibcode: 2004A&A...426..297K. 
  10. ↑ 10.0 10.1 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. 
  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. ISSN 0004-6361. Bibcode: 1999A&A...352..555A. 
  12. ↑ 12.0 12.1 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. 
  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. doi:10.1086/191527. ISSN 0067-0049. Bibcode: 1990ApJS...74.1075M. 
  14. ↑ 14.0 14.1 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. 
  15. ↑ "HD 196737". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+196737. 
  16. ↑ 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. doi:10.1111/j.1365-2966.2008.13596.x. ISSN 0035-8711. Bibcode: 2008MNRAS.389..869E. 
  17. ↑ 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. doi:10.1093/mnras/stx2219. ISSN 0035-8711. Bibcode: 2017MNRAS.472.3805G. 
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