Jump to content

HD 185075

Edit links
From Wikipedia, the free encyclopedia
HD 185075
Location of HD 185075 (circled)
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Telescopium
Right ascension 19h 40m 18.71944s[1]
Declination −54° 25′ 04.0417″[1]
Apparent magnitude (V) 6.26[2]
Characteristics
Spectral type K0 III[3]
B−V color index +1.00[2]
Astrometry
Radial velocity (Rv)14.8±0.4[4] km/s
Proper motion (μ) RA: +76.081 mas/yr[1]
Dec.: −11.563 mas/yr[1]
Parallax (π)7.7297 ± 0.0224 mas[1]
Distance422 ± 1 ly
(129.4 ± 0.4 pc)
Absolute magnitude (MV)+0.92[5]
Details
Mass1.34±0.06[6] M☉
Radius12.6±0.6[7] R☉
Luminosity79.8+0.2
−0.1[1] L☉
Surface gravity (log g)2.63±0.11[6] cgs
Temperature4,785±25[6] K
Metallicity [Fe/H]−0.42±0.02[6] dex
Rotational velocity (v sin i)<1[8] km/s
Age414[1] Myr
Other designations
65 G. Telescopii[9], CD−54°8939, CPD−54°9438, GC 27177, HD 185075, HIP 96781, HR 7459, SAO 246204[10]
Database references
SIMBADdata

HD 185075, also known as HR 7459 or rarely 65 G. Telescopii, is a solitary star located in the southern constellation Telescopium. It has an apparent magnitude of 6.26,[2] placing it near the limit for naked eye visibility, even under ideal conditions. Gaia DR3 parallax measurements imply a distance of 422 light years[1] and it is currently receding with a heliocentric radial velocity of 14.8 km/s.[4] At its current distance, HD 185075's brightness is diminished by 0.23 magnitudes due to interstellar dust[11] and it has an absolute magnitude of +0.92.[5]

This is an evolved red giant with a stellar classification of K0 III.[3] It has 1.34 times the mass of the Sun[6] but it has expanded to 12.6 times the Sun's radius.[7] It radiates 79.8 times the luminosity of the Sun[1] from its enlarged photosphere at an effective temperature of 4,785 K,[6] giving it an orange hue. HD 185075 is particularly metal deficient with an iron abundance 38% that of the Sun's[6] ([Fe/H] = −0.42) and it spins too slowly for its projected rotational velocity to be measured accurately.[8]

References[edit]

  1. ^ a b c d e f g h 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.
  2. ^ a b c Johnson, H. L.; Mitchell, R. I.; Iriarte, B.; Wisniewski, W. Z. (1966). "UBVRIJKL Photometry of the Bright Stars". Communications of the Lunar and Planetary Laboratory. 4: 99–110. Bibcode:1966CoLPL...4...99J. S2CID 118307502.
  3. ^ a b Houk, N.; Cowley, A. P. (1975). University of Michigan Catalogue of two-dimensional spectral types for the HD stars: Declinations −90° to −53°. Vol. 1. Bibcode:1975mcts.book.....H.
  4. ^ a b 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.
  5. ^ a b 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.
  6. ^ a b c d e f g Ottoni, G.; Udry, S.; Ségransan, D.; Buldgen, G.; Lovis, C.; Eggenberger, P.; Pezzotti, C.; Adibekyan, V.; Marmier, M.; Mayor, M.; Santos, N. C.; Sousa, S. G.; Lagarde, N.; Charbonnel, C. (January 2022). "CORALIE radial-velocity search for companions around evolved stars (CASCADES): I. Sample definition and first results: Three new planets orbiting giant stars". Astronomy & Astrophysics. 657: A87. arXiv:2201.01528. Bibcode:2022A&A...657A..87O. doi:10.1051/0004-6361/202040078. eISSN 1432-0746. ISSN 0004-6361.
  7. ^ a b 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.
  8. ^ a b De Medeiros, J. R.; Alves, S.; Udry, S.; Andersen, J.; Nordström, B.; Mayor, M. (January 2014). "A catalog of rotational and radial velocities for evolved stars V: Southern stars *". Astronomy & Astrophysics. 561: A126. arXiv:1312.3474. Bibcode:2014A&A...561A.126D. doi:10.1051/0004-6361/201220762. eISSN 1432-0746. ISSN 0004-6361. S2CID 54046583.
  9. ^ 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.
  10. ^ "HD 185075". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved March 30, 2023.
  11. ^ 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.
Retrieved from "https://en.wikipedia.org/w/index.php?title=HD_185075&oldid=1154746630"