HD 192827

Last updated
HD 192827
Telescopium constellation map.svg
Red circle.svg
Location of HD 192827 and HD 192886 (circled)
Observation data
Epoch J2000.0        Equinox J2000.0 (ICRS)
Constellation Telescopium
Right ascension 20h 18m 55.97916s [1]
Declination −47° 42′ 38.8042″ [1]
Apparent magnitude  (V)6.28±0.01 [2]
Characteristics
Evolutionary stage AGB [3]
Spectral type M1 III [4]
B−V color index +1.47 [5]
Variable type suspected [6]
Astrometry
Radial velocity (Rv)−43.7±0.9 [7]  km/s
Proper motion (μ)RA: +14.547  mas/yr [1]
Dec.: −3.934  mas/yr [1]
Parallax (π)2.4785 ± 0.0638  mas [1]
Distance 1,320 ± 30  ly
(400 ± 10  pc)
Absolute magnitude  (MV)−1.07 [8]
Details
Mass 1.21 [9]   M☉
Radius 119±6 [10]   R☉
Luminosity 1242±71 [11]   L☉
Surface gravity (log g)0.57 [9]   cgs
Temperature 3,786±122 [12]   K
Metallicity [Fe/H]−0.24 [9]   dex
Other designations
83 G. Telescopii [13] , NSV  25083, CD−48°13509, CPD−48°10371, FK5  1528, GC  28202, HD  192827, HIP  100151, HR  7745, SAO  230144 [14]
Database references
SIMBAD data

HD 192827, also known as HR 7745 or rarely 83 G. Telescopii, is a solitary red hued star located in the southern constellation Telescopium. It has an apparent magnitude of 6.28, [2] placing it near the limit for naked eye visibility. The object is located relatively far at a distance of 1,320 light years based on Gaia DR3 parallax measurements, [1] but it is approaching with a heliocentric radial velocity of −43.7  km/s . [7] At its current distance, HD 192827's brightness is diminished by 0.19 magnitudes due to interstellar dust [15] and it has an absolute magnitude of −1.07. [8]

A light curve for HD 192827, plotted from Hipparcos data HD192827LightCurve.png
A light curve for HD 192827, plotted from Hipparcos data

HD 192827 has a stellar classification of M1 III, [4] indicating that it is an evolved red giant. It is currently on the asymptotic giant branch, [3] generating energy by fusing hydrogen and helium shells around an inert carbon core. Having exhausted hydrogen at its core, HD 192827 has expanded to 119 times the radius of the Sun [10] and now radiates 1,242 times the luminosity of the Sun [11] from its enlarged photosphere at an effective temperature of 3,786  K . [12] It has a comparable mass to the Sun [9] and has a metallicity of [Fe/H] = −0.24, making it metal deficient. [9]

HD 192827 was first suspected to be variable in 1997 by the Hipparcos satellite. [17] It fluctuates between magnitudes 6.34 and 6.40 in the Hipparcos passband. [6] As of 2004 however, HD 192827 has not been confirmed to be variable. [18]

See also

Related Research Articles

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<span class="mw-page-title-main">28 Monocerotis</span> Star in the constellation Monoceros

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<span class="mw-page-title-main">Sigma Ophiuchi</span> Star in the constellation Ophiuchus

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<span class="mw-page-title-main">Y Centauri</span> Variable star in the constellation Centaurus

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<span class="mw-page-title-main">Iota Mensae</span> Star in the constellation Mensa

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<span class="mw-page-title-main">HD 174387</span> Star in the constellation of Telescopium

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HD 1032 is a solitary star in the southern circumpolar constellation Octans. It is faintly visible to the naked eye with an apparent magnitude of 5.77 and is estimated to be 850 light years away from the Solar System based on parallax measure. However, it is receding with a heliocentric radial velocity of 4 km/s.

<span class="mw-page-title-main">HD 187086</span> Astrometric binary and uspected variable star

HD 187086, also known as HR 7537, is a probable astrometric binary located in the southern constellation Telescopium. It has an average apparent magnitude of 5.9, making it faintly visible to the naked eye. The star is located relatively far at a distance of 1,020 light years based on Gaia DR3 parallax measurements but is rapidly drifting closer with a heliocentric radial velocity of −64 km/s. At its current distance, HD 187086's brightness is diminished by 0.27 magnitudes due to interstellar dust. It has an absolute magnitude of −0.8.

References

  1. 1 2 3 4 5 6 Vallenari, A.; et al. (Gaia Collaboration) (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics . arXiv: 2208.00211 . doi: 10.1051/0004-6361/202243940 . Gaia DR3 record for this source at VizieR.
  2. 1 2 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. 1 2 Eggen, Olin J. (July 1992). "Asymptotic giant branch stars near the sun". The Astronomical Journal. 104: 275. Bibcode:1992AJ....104..275E. doi: 10.1086/116239 . ISSN   0004-6256. S2CID   121672252.
  4. 1 2 Houk, Nancy (1978). Michigan catalogue of two-dimensional spectral types for the HD stars: Declinations −53° to −40°. Vol. 2. Bibcode:1978mcts.book.....H.
  5. ↑ Stoy, R. H. (1968). "Photoelectric Magnitudes and Colours for Bright Southern Stars". Monthly Notes of the Astronomical Society of South Africa. 27: 119. Bibcode:1968MNSSA..27..119S. ISSN   0024-8266.
  6. 1 2 Samus’, N. N.; Kazarovets, E. V.; Durlevich, O. V.; Kireeva, N. N.; Pastukhova, E. N. (January 2017). "General catalogue of variable stars: Version GCVS 5.1". Astronomy Reports. 61 (1): 80–88. Bibcode:2017ARep...61...80S. doi:10.1134/S1063772917010085. eISSN   1562-6881. ISSN   1063-7729. S2CID   125853869.
  7. 1 2 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. arXiv: 1606.08053 . Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065. eISSN   1562-6873. ISSN   1063-7737. S2CID   119231169.
  8. 1 2 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.
  9. 1 2 3 4 5 Anders, F.; et al. (August 2019). "Photo-astrometric distances, extinctions, and astrophysical parameters for Gaia DR2 stars brighter than G = 18". Astronomy & Astrophysics. 628: A94. arXiv: 1904.11302 . Bibcode:2019A&A...628A..94A. doi: 10.1051/0004-6361/201935765 . eISSN   1432-0746. ISSN   0004-6361. S2CID   131780028.
  10. 1 2 Kervella, P.; Thévenin, F.; Di Folco, E.; Ségransan, D. (October 2004). "The angular sizes of dwarf stars and subgiants. Surface brightness relations calibrated by interferometry". Astronomy & Astrophysics. 426 (1): 297–307. arXiv: astro-ph/0404180 . Bibcode:2004A&A...426..297K. doi: 10.1051/0004-6361:20035930 . eISSN   1432-0746. ISSN   0004-6361. S2CID   6077801.
  11. 1 2 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.
  12. 1 2 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.
  13. ↑ 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.
  14. ↑ "HD 192827". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved May 2, 2023.
  15. ↑ 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.
  16. ↑ EAS (1997). "The HIPPARCOS and TYCHO catalogues". Astrometric and Photometric Star Catalogues Derived from the ESA Hipparcos Space Astrometry Mission. ESA SP Series. Noordwijk, Netherlands: ESA Publications Division. 1200. Bibcode:1997ESASP1200.....E. ISBN   9290923997 . Retrieved 2 May 2023.
  17. ↑ Perryman, M. A. C.; Lindegren, L.; Kovalevsky, J.; Hoeg, E.; Bastian, U.; Bernacca, P. L.; Crézé, M.; Donati, F.; Grenon, M.; Grewing, M.; van Leeuwen, F. (July 1997). "The HIPPARCOS Catalogue". Astronomy and Astrophysics. 323: L49–L52. Bibcode:1997A&A...323L..49P. ISSN   0004-6361.
  18. ↑ Samus, N. N.; Durlevich, O. V. (November 2004). "VizieR Online Data Catalog: Combined General Catalogue of Variable Stars (Samus+ 2004)". VizieR Online Data Catalog: II/250. Bibcode:2004yCat.2250....0S.
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