HD 187086

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HD 187086
HD187086LightCurve.png
A light curve for HD 187086, plotted from Hipparcos data [1]
Observation data
Epoch J2000.0        Equinox J2000.0 (ICRS)
Constellation Telescopium
Right ascension 19h 50m 14.05959s [2]
Declination −47° 33′ 26.6014″ [2]
Apparent magnitude  (V)5.95 - 6.07 [3]
Characteristics
Evolutionary stage AGB [4]
Spectral type M1 III [5]
B−V color index +1.67 [6]
Variable type suspected [3]
Astrometry
Radial velocity (Rv)−64±1 [7]  km/s
Proper motion (μ)RA: +9.424  mas/yr [2]
Dec.: −10.867  mas/yr [2]
Parallax (π)3.1998 ± 0.0655  mas [2]
Distance 1,020 ± 20  ly
(313 ± 6  pc)
Absolute magnitude  (MV)−0.80 [8]
Details
Mass 1.76±0.09 [9]   M☉
Radius 111±6 [10]   R☉
Luminosity 1,031±56 [11]   L☉
Surface gravity (log g)1.5±1 [2]   cgs
Temperature 3,821±122 [12]   K
Metallicity [Fe/H]+0.24 [2]   dex
Other designations
69 G. Telescopii [13] , NSV  12432, CD−47°13103, CPD−47°9366, GC  27427, HD  187086, HIP  95798, HR  7537, SAO  229887 [14]
Database references
SIMBAD data

HD 187086, also known as HR 7537, is a probable astrometric binary [15] (87% chance [16] ) 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 [2] but is rapidly drifting closer with a heliocentric radial velocity of −64  km/s . [7] At its current distance, HD 187086's brightness is diminished by 0.27 magnitudes due to interstellar dust. [17] It has an absolute magnitude of −0.8. [8]

The primary has a stellar classification of M1 III, [5] indicating that it is a red giant. It is currently on the asymptotic giant branch, fusing hydrogen and helium shells around an inert carbon core. It has 1.76 times the mass of the Sun [9] but it has expanded to 111 times the solar radius. [10] It radiates 1,031 times the luminosity of the Sun [11] from its enlarged photosphere at an effective temperature of 3,821  K , [12] giving it a red hue. HD 187086 is particularly metal enriched ([Fe/H] = +0.24). [2]

HD 187086 fluctuates between 5.95 and 6.07 [3] and its variability was first noticed by P.M. Corben in 1971 after being listed as an ordinary M-type giant a year prior. [6] [18] In 2002, Chris Koen and Laurent Eyer reported that the Hipparcos data shows periodic fluctuations with an amplitude of 0.023 magnitudes, and a period of 7.6805 days. [19] As of 2004 however, it is not confirmed to be variable. [20]

Related Research Articles

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

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<span class="mw-page-title-main">AF Columbae</span> Star in the constellation of Columba

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<span class="mw-page-title-main">HD 40091</span> Star in the constellation Columba

HD 40091, also known as HR 2082, is a solitary star located in the southern constellation Columba, the dove. It has an apparent magnitude of 5.54, making it faintly visible to the naked eye under ideal conditions. Based on parallax measurements from the Gaia spacecraft, the object is estimated to be 501 light years distant. However, it is rapidly receding with a high heliocentric radial velocity of 114 km/s.

<span class="mw-page-title-main">8 Leonis Minoris</span> Star in the constellation of Leo Minor

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<span class="mw-page-title-main">HD 168592</span> Star in the constellation of Corona Australis

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<span class="mw-page-title-main">HD 192827</span> Suspected variable; Telescopium

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, 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, but it is approaching with a heliocentric radial velocity of −43.7 km/s. At its current distance, HD 192827's brightness is diminished by 0.19 magnitudes due to interstellar dust and it has an absolute magnitude of −1.07.

<span class="mw-page-title-main">HD 196917</span> Suspected variable star in Microscopium

HD 196917 is a solitary star located in the southern constellation Microscopium. It is faintly visible to the naked eye as a red-hued point of light with an apparent magnitude of 5.74. Gaia DR3 parallax measurements imply a distance of 426 light-years and it is rapidly approaching the Solar System with a heliocentric radial velocity of −97.3 km/s. At its current distance, HD 196917's brightness is diminished by 0.13 magnitudes due to interstellar extinction and it has an absolute magnitude of +0.04.

<span class="mw-page-title-main">HD 90362</span> Suspected variable star; Sextans

HD 90362 is a solitary star located in the equatorial constellation Sextans. It is faintly visible to the naked eye as a redish-orange-hued point of light with an apparent magnitude of 5.56. Gaia DR3 parallax measurements imply a distance of approximately 460 light-years and it is receding with a heliocentric radial velocity of 35.6 km/s. At its current distance, HD 90362's brightness is diminished by an interstellar extinction of 0.19 magnitudes and it has an absolute magnitude of +0.19.

References

  1. ↑ EAS (1997). "The HIPPARCOS and TYCHO catalogues". Astrometric and Photometric Star Catalogues Derived from the ESA Hipparcos Space Astrometry Mission. ESA SP Series. 1200. Noordwijk, Netherlands: ESA Publications Division. Bibcode:1997ESASP1200.....E. ISBN   9290923997 . Retrieved 15 October 2022.
  2. 1 2 3 4 5 6 7 8 9 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.
  3. 1 2 3 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.
  4. ↑ 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.
  5. 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.
  6. 1 2 Corben, P. M. (April 1971). "Photoelectric Magnitudes and Colours for Bright Southern Stars". Monthly Notes of the Astronomical Society of South Africa. 30 (4): 37. Bibcode:1971MNSSA..30...37C. ISSN   0024-8266.
  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 Corbally, C. J.; Garrison, R. F. (1984). "Which Map of Absolute Magnitudes: Keenan or Schmidt-Kaler?". The Mk Process and Stellar Classification: 277. Bibcode:1984mpsc.conf..277C.
  9. 1 2 Kervella, Pierre; Arenou, Frédéric; Thévenin, Frédéric (2022). "Stellar and substellar companions from Gaia EDR3". Astronomy & Astrophysics. 657: A7. arXiv: 2109.10912 . Bibcode:2022A&A...657A...7K. doi: 10.1051/0004-6361/202142146 . eISSN   1432-0746. ISSN   0004-6361.
  10. 1 2 Kervella, P.; Thévenin, F.; Di Folco, E.; Ségransan, D. (October 2004). "The angular sizes of dwarf stars and subgiants". 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.
  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 187086". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved February 1, 2023.
  15. ↑ Eggleton, P. P.; Tokovinin, A. A. (11 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 . eISSN   1365-2966. ISSN   0035-8711. S2CID   14878976.
  16. ↑ Frankowski, A.; Jancart, S.; Jorissen, A. (19 December 2006). "Proper-motion binaries in the Hipparcos catalogue". 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.
  17. ↑ 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.
  18. ↑ Eggen, O. J.; Stokes, N. R. (July 1970). "Narrow-Band and Broad-Band Photometry of Red Stars. III. Southern Giants". The Astrophysical Journal. 161: 199. Bibcode:1970ApJ...161..199E. doi: 10.1086/150525 . eISSN   1538-4357. ISSN   0004-637X.
  19. ↑ Koen, Chris; Eyer, Laurent (March 2002). "New periodic variables from the Hipparcos epoch photometry". Monthly Notices of the Royal Astronomical Society. 331 (1): 45–59. arXiv: astro-ph/0112194 . Bibcode:2002MNRAS.331...45K. doi: 10.1046/j.1365-8711.2002.05150.x . S2CID   10505995.
  20. ↑ 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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