Astronomy:HD 177693

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Short description: K-type giant in the constellation Telescopium
HD 177693
Location of HD 177693 on the map (circled)
Observation data
Epoch J2000.0   Equinox (celestial coordinates)
Constellation Telescopium
Right ascension  19h 08m 52.32474s[1]
Declination −55° 43′ 13.5297″[1]
Apparent magnitude (V) 6.45±0.01[2]
Characteristics
Spectral type K1 III[3] or K1 IV[4]
B−V color index +1.10[5]
Astrometry
Radial velocity (Rv)−20.9±2.9[6] km/s
Proper motion (μ) RA: +56.586[1] mas/yr
Dec.: −115.876[1] mas/yr
Parallax (π)8.6669 ± 0.0269[1] mas
Distance376 ± 1 ly
(115.4 ± 0.4 pc)
Absolute magnitude (MV)+1.03[7]
Details
Mass1.25[8] M☉
Radius10.6[9] R☉
Luminosity50.2+0.4−0.3[1] L☉
Surface gravity (log g)2.52[8] cgs
Temperature4,750±122[10] K
Metallicity [Fe/H]−0.10[8] dex
Rotational velocity (v sin i)<1.3[11] km/s
Other designations
CPD−55°9001, GC 26319, HD 177693, HIP 94054, HR 7233, SAO 245937[12]
Database references
SIMBADdata

HD 177693 (HR 7233; 48 G. Telescopii) is a solitary orange-hued star located in the southern constellation Telescopium. It has an apparent magnitude of 6.45,[2] placing it near the limit for naked eye visibility, even under ideal conditions. Gaia DR3 parallax measurements imply a distance of 376 light-years,[1] and it is drifting closer with a heliocentric radial velocity of −20.9 km/s.[6] At its current distance, HD 177693's brightness is diminished by 0.24 magnitudes due to interstellar extinction[13] and it has an absolute magnitude of +1.03.[7]

HD 177693 has a stellar classification of K1 III,[3] indicating that it is an evolved orange giant. David Stanley Evans gave a less evolved class of K1 IV,[4] instead indicating that it is a slightly evolved subgiant. It has 1.25 times the mass of the Sun[8] but it has expanded to 10.6 times the radius of the Sun.[9] It radiates 50.2 times the luminosity of the Sun[1] from its enlarged photosphere at an effective temperature of 4,750 K.[10] HD 177693 is slightly metal deficient with an iron abundance of [Fe/H] = −0.10[8] and it spins with a projected rotational velocity lower than 1.3 km/s.[11]

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 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 Houk, N.; Cowley, A. P. (1975). University of Michigan Catalogue of two-dimensional spectral types for the HD stars: Declinations −90° to −53°. 1. Bibcode: 1975mcts.book.....H. 
  4. ↑ 4.0 4.1 Evans, D. S. (1966). "Fundamental data for Southern stars (6th list).". Royal Greenwich Observatory Bulletins 110: 185. Bibcode: 1966RGOB..110..185E. 
  5. ↑ 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. ↑ 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 8.4 Anders, F. et al. (February 2022). "Photo-astrometric distances, extinctions, and astrophysical parameters for Gaia EDR3 stars brighter than G = 18.5". Astronomy & Astrophysics 658: A91. doi:10.1051/0004-6361/202142369. ISSN 0004-6361. Bibcode: 2022A&A...658A..91A. 
  9. ↑ 9.0 9.1 McDonald, I.; Zijlstra, A. A.; Watson, R. A. (15 June 2017). "Fundamental parameters and infrared excesses of Tycho–Gaia stars". Monthly Notices of the Royal Astronomical Society 471 (1): 770–791. doi:10.1093/mnras/stx1433. ISSN 0035-8711. Bibcode: 2017MNRAS.471..770M. 
  10. ↑ 10.0 10.1 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. 
  11. ↑ 11.0 11.1 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 V: Southern stars *". Astronomy & Astrophysics 561: A126. doi:10.1051/0004-6361/201220762. ISSN 0004-6361. Bibcode: 2014A&A...561A.126D. 
  12. ↑ "HD 177693". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+177693. 
  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. doi:10.1093/mnras/stx2219. ISSN 0035-8711. Bibcode: 2017MNRAS.472.3805G. 



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