HD 177365

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HD 177365
Observation data
Epoch J2000.0 (ICRS      Equinox J2000.0 (ICRS
Constellation Telescopium
Right ascension 19h 06m 54.81838s[1]
Declination −50° 19′ 23.3136″[1]
Apparent magnitude (V) 6.27±0.01[2]
Characteristics
Spectral type B9 V[3]
B−V color index −0.10[4]
Astrometry
Radial velocity (Rv)15.5±0.7[1] km/s
Proper motion (μ) RA: −2.721 mas/yr[1]
Dec.: −31.275 mas/yr[1]
Parallax (π)8.7497 ± 0.1414 mas[1]
Distance373 ± 6 ly
(114 ± 2 pc)
Absolute magnitude (MV)+0.16[5]
Details
Mass3.05+0.45
−0.33[6] M☉
Radius3.33+0.12
−0.15[6] R☉
Luminosity119[7] L☉
Surface gravity (log g)3.88+0.09
−0.05[6] cgs
Temperature11,557+275
−352[6] K
Metallicity [Fe/H]−0.11[8] dex
Age226[9] Myr
Other designations
46 G. Telescopii[10], CD−50°12326, CPD−50°10955, GC 26265, HD 177365, HIP 93860, SAO 245925, WDS 19070-5019[11]
Database references
SIMBADdata

HD 177365 is a visual binary[12] located in the southern constellation Telescopium. It has an apparent magnitude of 6.27,[2] placing it near the limit for naked eye visibility, even under ideal conditions. Gaia DR3 parallax measurements imply a distance of 373 light-years and it is currently receding with a heliocentric radial velocity of 15.5 km/s.[1] At its current distance, HD 177365's brightness is diminished by two-tenths of a magnitude due to interstellar extinction[13] and it has an absolute magnitude of +0.16.[5]

The binarity of the system was first noticed in a 1996 United States Naval Observatory survey.[14] A Hipparcos proper motion survey published in 2006 catalogued the primary as a probable astrometric binary with an 89.6% chance.[15] HD 177365 B, the companion, is a 16th magnitude star located 101.3" away along a position angle of 218° as of 2015.[14]

The visible component has a stellar classification of B9 V,[3] indicating that it is an ordinary B-type main-sequence star that is generating energy via hydrogen fusion. It has 3.05 times the mass of the Sun[6] and 3.33 times the radius of the Sun.[6] It radiates 119 times the luminosity of the Sun[7] from its photosphere at an effective temperature of 11,557 K.[6] HD 177365 A is slightly metal deficient with an iron abundance 78% that of the Sun's ([Fe/H] = −0.11)[8] and it is estimated to be 226 million years old.[9]

References[edit]

  1. ^ a b c d e f 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.
  2. ^ a b 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. S2CID 17128864.
  3. ^ a b Houk, Nancy (1978). Michigan catalogue of two-dimensional spectral types for the HD stars: Declinations −53° to −40°. Vol. 2. Bibcode:1978mcts.book.....H.
  4. ^ Cousins, A. W. J.; Stoy, R. H. (1962). "Photoelectric magnitudes and colours of Southern stars". Royal Greenwich Observatory Bulletins. 64: 103. Bibcode:1962RGOB...64..103C. S2CID 118805499.
  5. ^ a b 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.
  6. ^ a b c d e f g 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.
  7. ^ a b 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. arXiv:1706.02208. Bibcode:2017MNRAS.471..770M. doi:10.1093/mnras/stx1433. eISSN 1365-2966. ISSN 0035-8711. S2CID 73594365.
  8. ^ a b 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. arXiv:2111.01860. Bibcode:2022A&A...658A..91A. doi:10.1051/0004-6361/202142369. eISSN 1432-0746. ISSN 0004-6361.
  9. ^ a b Gontcharov, G. A. (November 2012). "Spatial distribution and kinematics of OB stars". Astronomy Letters. 38 (11): 694–706. arXiv:1606.09028. Bibcode:2012AstL...38..694G. doi:10.1134/S1063773712110035. eISSN 1562-6873. ISSN 1063-7737. S2CID 255202762.
  10. ^ 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.
  11. ^ "HD 177365". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved August 4, 2023.
  12. ^ Malkov, O.; Karchevsky, A.; Kaygorodov, P.; Kovaleva, D. (1 March 2016). "Identification List of Binaries". Open Astronomy. 25 (1): 49–52. Bibcode:2016BaltA..25...49M. doi:10.1515/astro-2017-0109. ISSN 1021-6766. S2CID 63290559.
  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. arXiv:1709.01160. Bibcode:2017MNRAS.472.3805G. doi:10.1093/mnras/stx2219. eISSN 1365-2966. ISSN 0035-8711. S2CID 118879856.
  14. ^ a b 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. S2CID 119533755.
  15. ^ Frankowski, A.; Jancart, S.; Jorissen, A. (19 December 2006). "Proper-motion binaries in the Hipparcos catalogue: Comparison with radial velocity data". Astronomy & Astrophysics. 464 (1): 377–392. arXiv:astro-ph/0612449. Bibcode:2007A&A...464..377F. doi:10.1051/0004-6361:20065526. eISSN 1432-0746. ISSN 0004-6361. S2CID 14010423.
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