HD 180450

Last updated
HD 180450
Observation data
Epoch J2000.0       Equinox J2000.0
Constellation Lyra [1]
Right ascension 19h 15m 24.85937s [2]
Declination +30° 31′ 34.9760″ [2]
Apparent magnitude  (V)5.88 [1]
Characteristics
Evolutionary stage AGB [3]
Spectral type M1IIIab [1]
U−B color index +2.03
B−V color index +1.665±0.007 [1]
Astrometry
Radial velocity (Rv)−64.43±0.23 [2] km/s
Proper motion (μ)RA: 34.425 [2] mas/yr
Dec.: −26.081 [2] mas/yr
Parallax (π)2.37±0.61  mas [2]
Distance approx. 1,400  ly
(approx. 400  pc)
Absolute magnitude  (MV)−2.03 [1]
Details
Mass 1.4 [4]   M☉
Radius 84 [5]   R☉
Luminosity 1,218 [5]   L☉
Surface gravity (log g)1.58 [4]   cgs
Temperature 3,733 [5]   K
Metallicity [Fe/H]−0.23 [4]   dex
Other designations
BD+30°3491, GC 26550, HD 180450, HIP 94630, HR 7302, SAO 68040, GSC 02653-01682 [6]
Database references
SIMBAD data

HD 180450 is a single [7] star in the northern constellation of Lyra, positioned about half a degree to the NNW of the globular cluster M56. [8] At an apparent visual magnitude of 5.88, [1] it is dimly visible to the naked eye under good viewing conditions. This star is located at a distance of approximately 1,400  light years from the Sun based on parallax measurements, but is drifting closer with a radial velocity of −64.4 km/s. [2]

This is an aging red giant star with a stellar classification of M1IIIab, [1] It is currently on the asymptotic giant branch, [9] having exhausted the supply of hydrogen in its core and evolved of the main sequence. It has expanded to ~68 times the radius of the Sun and is radiating a thousand times the Sun' luminosity from its enlarged photosphere at en effective temperature of 3,947 K. [2]

References

  1. 1 2 3 4 5 6 7 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. XHIP record for this object at VizieR.
  2. 1 2 3 4 5 6 7 8 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.
  3. ↑ Eggen, Olin J. (1992). "Asymptotic Giant Branch Stars Near the Sun". The Astronomical Journal. 104: 275. Bibcode:1992AJ....104..275E. doi:10.1086/116239.
  4. 1 2 3 Khalatyan, A.; Anders, F.; Chiappini, C.; Queiroz, A. B. A.; Nepal, S.; Dal Ponte, M.; Jordi, C.; Guiglion, G.; Valentini, M.; Torralba Elipe, G.; Steinmetz, M.; Pantaleoni-González, M.; Malhotra, S.; Jiménez-Arranz, Ó.; Enke, H.; Casamiquela, L.; Ardèvol, J. (2024). "Transferring spectroscopic stellar labels to 217 million Gaia DR3 XP stars with SHBoost". Astronomy and Astrophysics. 691: A98. arXiv: 2407.06963 . Bibcode:2024A&A...691A..98K. doi:10.1051/0004-6361/202451427.
  5. 1 2 3 Van Belle, Gerard T.; von Braun, Kaspar; Ciardi, David R.; Pilyavsky, Genady; Buckingham, Ryan S.; Boden, Andrew F.; Clark, Catherine A.; Hartman, Zachary; Van Belle, Gerald; Bucknew, William; Cole, Gary (2021). "Direct Measurements of Giant Star Effective Temperatures and Linear Radii: Calibration against Spectral Types and V - K Color". The Astrophysical Journal. 922 (2): 163. arXiv: 2107.09205 . Bibcode:2021ApJ...922..163V. doi: 10.3847/1538-4357/ac1687 .
  6. ↑ "HD 180450". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 2021-10-14.
  7. ↑ 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.
  8. ↑ Sinnott, Roger W.; Perryman, Michael A. C. (1997), Millennium Star Atlas, vol. 3, Sky Publishing Corporation and the European Space Agency, p. 1174, ISBN   0-933346-84-0.
  9. ↑ Eggen, Olin J. (July 1992), "Asymptotic giant branch stars near the sun", Astronomical Journal, 104 (1): 275–313, Bibcode:1992AJ....104..275E, doi:10.1086/116239.


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