Jump to content

HD 90362

From Wikipedia, the free encyclopedia
HD 90362
Location of HD 90362 on the map (circled)
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Sextans
Right ascension 10h 25m 44.27091s[1]
Declination −07° 03′ 35.3764″[1]
Apparent magnitude (V) 5.56[2]
Characteristics
Evolutionary stage AGB[3]
Spectral type K6 III Fe −0.5[4]
U−B color index +1.86[2]
B−V color index +1.53[2]
Variable type suspected[5]
Astrometry
Radial velocity (Rv)35.60±0.25[6] km/s
Proper motion (μ) RA: −135.763 mas/yr[1]
Dec.: +130.341 mas/yr[1]
Parallax (π)7.127 ± 0.1702 mas[1]
Distance460 ± 10 ly
(140 ± 3 pc)
Absolute magnitude (MV)+0.19[7]
Details
Mass0.44±0.14[8] M☉
Radius41.1±2.1[9] R☉
Luminosity252±9[10] L☉
Surface gravity (log g)0.96+0.02
−0.03[11] cgs
Temperature3,804[12] K
Metallicity [Fe/H]−0.10±0.05[8] dex
Rotational velocity (v sin i)1.5±1.0[13] km/s
Age11.0+1.9
−1.6[8] Gyr
Other designations
47 G. Sextantis[14], NSV 18399, BD−06°3146, FK5 2836, GC 14321, HD 90362, HIP 51046, HR 4092, SAO 137557, CCDM J10258-0704A, WDS J10257-0704A, TIC 36881111[15]
Database references
SIMBADdata

HD 90362 (HR 4092; 47 G. Sextantis) is a solitary star[16] 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.[2] Gaia DR3 parallax measurements imply a distance of approximately 460 light-years[1] and it is receding with a heliocentric radial velocity of 35.6 km/s.[6] At its current distance, HD 90362's brightness is diminished by an interstellar extinction of 0.19 magnitudes[17] and it has an absolute magnitude of +0.19.[7]

HD 90362 is an old population II star[18] with a stellar classification of K6 III Fe −0.5,[4] indicating that it is an evolved K-type giant that has exhausted hydrogen at its core and left the main sequence along with a mild spectral underabundance of iron. It is currently on the asymptotic giant branch, generating energy via the fusion of hydrogen and helium shells around an inert carbon core.[3] It has only 44% the mass of the Sun[8] but at the age of 11 billion years,[8] it has expanded to 41.1 times the radius of the Sun.[9] It radiates 252 times the luminosity of the Sun[10] from its enlarged photosphere at an effective temperature of 3,804 K.[12] HD 90362 is metal deficient with an iron abundance of [Fe/H] = −0.1 or 79.4% of the Sun's[8] and it spins slowly with a projected rotational velocity of approximately 1.5 km/s.[13]

The variability of the star was first detected in 1997 by the Hipparcos mission.[19] It found variations between 5.69 and 5.72 in the Hipparcos passband. As of 2004, its variability has not been confirmed.[20] HD 90362 has an optical companion located 142.6" away along a position angle of 100° as of 2010.[21] It was first observed by M. Scaria in 1981.[21]

References[edit]

  1. ^ a b c d e 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 d 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.
  3. ^ a b 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. ^ a b Keenan, Philip C.; McNeil, Raymond C. (October 1989). "The Perkins catalog of revised MK types for the cooler stars". The Astrophysical Journal Supplement Series. 71: 245. Bibcode:1989ApJS...71..245K. doi:10.1086/191373. eISSN 1538-4365. ISSN 0067-0049.
  5. ^ 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.
  6. ^ a b Famaey, B.; Pourbaix, D.; Frankowski, A.; Van Eck, S.; Mayor, M.; Udry, S.; Jorissen, A. (18 February 2009). "Spectroscopic binaries among Hipparcos M giants". Astronomy & Astrophysics. 498 (2): 627–640. arXiv:0901.0934. Bibcode:2009A&A...498..627F. doi:10.1051/0004-6361/200810698. eISSN 1432-0746. ISSN 0004-6361.
  7. ^ 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.
  8. ^ a b c d e f Feuillet, Diane K.; Bovy, Jo; Holtzman, Jon; Girardi, Léo; MacDonald, Nick; Majewski, Steven R.; Nidever, David L. (20 January 2016). "Determining Ages of APOGEE Giants with Known Distances". The Astrophysical Journal. 817 (1): 40. arXiv:1511.04088. Bibcode:2016ApJ...817...40F. doi:10.3847/0004-637X/817/1/40. eISSN 1538-4357. S2CID 118675933.
  9. ^ a b Kervella, P.; Thévenin, F.; Di Folco, E.; Ségransan, D. (April 8, 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.
  10. ^ a b 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.
  11. ^ Poggio, E.; Recio-Blanco, A.; Palicio, P. A.; Re Fiorentin, P.; de Laverny, P.; Drimmel, R.; Kordopatis, G.; Lattanzi, M. G.; Schultheis, M.; Spagna, A.; Spitoni, E. (30 September 2022). "The chemical signature of the Galactic spiral arms revealed by Gaia DR3". Astronomy & Astrophysics. 666: L4. arXiv:2206.14849. Bibcode:2022A&A...666L...4P. doi:10.1051/0004-6361/202244361. eISSN 1432-0746. ISSN 0004-6361.
  12. ^ a b Ting, Yuan-Sen; Conroy, Charlie; Rix, Hans-Walter; Cargile, Phillip (July 8, 2019). "The Payne : Self-consistent ab initio Fitting of Stellar Spectra". The Astrophysical Journal. 879 (2): 69. arXiv:1804.01530. Bibcode:2019ApJ...879...69T. doi:10.3847/1538-4357/ab2331. ISSN 1538-4357. S2CID 54588218.
  13. ^ 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.
  14. ^ 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.
  15. ^ "HD 90362". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved December 28, 2023.
  16. ^ 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.
  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. S2CID 118879856.
  18. ^ Cacciari, C.; Malagnini, M. L.; Morossi, C.; Rossi, L. (September 1987). "Physical parameters for Population II stars". Astronomy and Astrophysics. 183: 314–318. Bibcode:1987A&A...183..314C. ISSN 0004-6361. S2CID 117292711.
  19. ^ 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.
  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.
  21. ^ a b Mason, Brian D.; Wycoff, Gary L.; Hartkopf, William I.; Douglass, Geoffrey G.; Worley, Charles E. (December 2001). "The 2001 US Naval Observatory Double Star CD-ROM. I. The Washington Double Star Catalog". The Astronomical Journal. 122 (6): 3466–3471. Bibcode:2001AJ....122.3466M. doi:10.1086/323920. ISSN 0004-6256. S2CID 119533755.
Retrieved from "https://en.wikipedia.org/w/index.php?title=HD_90362&oldid=1192649129"