Astronomy:HD 177693

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Short description: K-type giant in the constellation Telescopium
HD 177693
Telescopium constellation map.svg
Red circle.svg
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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