HD 175740

In this article we will explore in detail HD 175740, a topic that has aroused the interest of various sectors and that has generated a wide debate in today's society. HD 175740 has significantly impacted various aspects of our daily lives, and its influence has become increasingly evident in recent years. Through a comprehensive analysis, we will examine the many facets of HD 175740, from its origins and history to its implications in today's world. Additionally, we will examine how HD 175740 has evolved over time and how it has affected different people and communities around the world. This topic is of great relevance today, so it is essential to understand its ramifications and challenges in order to address it effectively.

HD 175740
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Lyra
Right ascension 18h 54m 52.17758s[1]
Declination +41° 36′ 09.7934″[1]
Apparent magnitude (V) 5.46[2]
Characteristics
Spectral type K0III[3]
B−V color index 1.034±0.004[2]
Astrometry
Radial velocity (Rv)−9.52±0.13[4] km/s
Proper motion (μ) RA: −2.059[1] mas/yr
Dec.: −2.234[1] mas/yr
Parallax (π)12.2448±0.0874 mas[1]
Distance266 ± 2 ly
(81.7 ± 0.6 pc)
Absolute magnitude (MV)0.89[2]
Details
Mass1.39[5] or 2.795[4] M☉
Radius10.17+0.35
−0.73[1] R☉
Luminosity49.90±0.45[1] L☉
Surface gravity (log g)2.8[6] cgs
Temperature4,811+181
−81[1] K
Metallicity −0.01±0.06[2] dex
Rotational velocity (v sin i)4.0[6] km/s
Age4.78[5] Gyr
Other designations
BD+41°3177, GC 25972, HD 175740, HIP 92831, HR 7146, SAO 47909, WDS J18549+4136A[7]
Database references
SIMBADdata

HD 175740 is a single[8] star in the northern constellation of Lyra.[2] This object has an orange hue and is dimly visible to the naked eye with an apparent visual magnitude of 5.46.[2] It is located at a distance of approximately 266 light years from the Sun based on parallax,[1] and has an absolute magnitude of 0.89.[2] The star is drifting closer with a radial velocity of −9.5 km/s, and is predicted to come as close as 31.7 light-years in around 8 million years.[4]

This is an aging giant star with a stellar classification of K0III,[3] having evolved off the main sequence after the supply of hydrogen at its core was exhausted. It is an estimated 4.78[5] billion years old with 1.39[5] times the mass of the Sun, although Bailer-Jones et al. (2018) give a higher estimate of 2.8[4] times the Sun's mass. The elemental composition of this star has made it the first giant to be a candidate solar sibling, suggesting it may have been born in the same star cluster as the Sun.[9] It has expanded to ten[1] times the girth of the Sun and is radiating 50[1] times the Sun's luminosity from its photosphere at an effective temperature of 4,811 K.[1]

HD 175740 has a magnitude 12.6 visual companion, located at an angular separation of 8.4″ along a position angle (PA) of 300°, as of 2013. A magnitude 11.5 companion lies at a separation of 24.1″ along a PA of 39°, as of 2014. Both were discovered by American astronomer G. W. Hough in 1887.[10]

References

  1. ^ a b c d e f g h i j k l Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  2. ^ a b c d e f g Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv:1108.4971, Bibcode:2012AstL...38..331A, doi:10.1134/S1063773712050015, S2CID 119257644.
  3. ^ a b Abt, H. A. (September 1985), "Visual multiples. VIII - 1000 MK types", Astrophysical Journal Supplement Series, 59: 95–112, Bibcode:1985ApJS...59...95A, doi:10.1086/191064
  4. ^ a b c d Bailer-Jones, C.A.L.; et al. (2018), "New stellar encounters discovered in the second Gaia data release", Astronomy & Astrophysics, 616: A37, arXiv:1805.07581, Bibcode:2018A&A...616A..37B, doi:10.1051/0004-6361/201833456, S2CID 56269929.
  5. ^ a b c d Luck, R. Earle (2015), "Abundances in the Local Region. I. G and K Giants", Astronomical Journal, 150 (3), 88, arXiv:1507.01466, Bibcode:2015AJ....150...88L, doi:10.1088/0004-6256/150/3/88, S2CID 118505114.
  6. ^ a b Massarotti, Alessandro; et al. (January 2008), "Rotational and Radial Velocities for a Sample of 761 HIPPARCOS Giants and the Role of Binarity", The Astronomical Journal, 135 (1): 209–231, Bibcode:2008AJ....135..209M, doi:10.1088/0004-6256/135/1/209.
  7. ^ "HD 175740". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2020-02-09.
  8. ^ Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869–879, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x, S2CID 14878976.
  9. ^ Ramírez, I.; et al. (June 2014), "Elemental Abundances of Solar Sibling Candidates", The Astrophysical Journal, 787 (2): 17, arXiv:1405.1723, Bibcode:2014ApJ...787..154R, doi:10.1088/0004-637X/787/2/154, S2CID 118441281, 154.
  10. ^ Mason, B. D.; et al. (2014), "The Washington Visual Double Star Catalog", The Astronomical Journal, 122 (6): 3466, Bibcode:2001AJ....122.3466M, doi:10.1086/323920.