Astronomy:HD 177365

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Short description: Binary star in the constellation Telescopium
HD 177365
Observation data
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[1] mas/yr
Dec.: −31.275[1] mas/yr
Parallax (π)8.7497 ± 0.1414[1] mas
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
CD−50°12326, CPD−50°10955, GC 26265, HD 177365, HIP 93860, SAO 245925, WDS 19070-5019[10]
Database references
SIMBADdata

HD 177365 is a visual binary[11] 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[12] 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.[13] A Hipparcos proper motion survey published in 2006 catalogued the primary as a probable astrometric binary with an 89.6% chance.[14] HD 177365 B, the companion, is a 16th magnitude star located 101.3" away along a position angle of 218° as of 2015.[13]

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

  1. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 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, Nancy (1978). Michigan catalogue of two-dimensional spectral types for the HD stars: Declinations −53° to −40°. 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. 
  5. ↑ 5.0 5.1 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. 
  6. ↑ 6.0 6.1 6.2 6.3 6.4 6.5 6.6 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. 
  7. ↑ 7.0 7.1 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. 
  8. ↑ 8.0 8.1 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 Gontcharov, G. A. (November 2012). "Spatial distribution and kinematics of OB stars". Astronomy Letters 38 (11): 694–706. doi:10.1134/S1063773712110035. ISSN 1063-7737. Bibcode: 2012AstL...38..694G. 
  10. ↑ "HD 177365". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+177365. 
  11. ↑ Malkov, O.; Karchevsky, A.; Kaygorodov, P.; Kovaleva, D. (1 March 2016). "Identification List of Binaries". Open Astronomy 25 (1): 49–52. doi:10.1515/astro-2017-0109. ISSN 1021-6766. Bibcode: 2016BaltA..25...49M. 
  12. ↑ 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. 
  13. ↑ 13.0 13.1 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. doi:10.1086/323920. ISSN 0004-6256. Bibcode: 2001AJ....122.3466M. 
  14. ↑ 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. doi:10.1051/0004-6361:20065526. ISSN 0004-6361. Bibcode: 2007A&A...464..377F. 
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