Wikipedia

HD 59640

HD 59640 is a solitary white hued star located in the southern circumpolar constellation Volans. It has an apparent magnitude of 6.48,[4] placing it near the limit for naked eye visibility. Gaia DR3 parallax measurements place the object at a distance of 262 light years[3] and it is receding with a heliocentric radial velocity of 18.4 km/s.[3] At its current distance, HD 59640's brightness is diminished by three tenths of a magnitude due to interstellar dust.[15]

HD 59640

A light curve for HD 59640, plotted from TESS data,[1] showing a flare whose flux peaked at UT 15:27.[2]
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Volans
Right ascension 07h 24m 37.12530s[3]
Declination −71° 28′ 14.3716″[3]
Apparent magnitude (V) 6.48±0.01[4]
Characteristics
Spectral type A3 V[5]
U−B color index +0.08[6]
B−V color index +0.12[6]
Variable type suspected[2]
Astrometry
Radial velocity (Rv)18.4±0.4[3] km/s
Proper motion (μ) RA: +7.272 mas/yr[3]
Dec.: +42.576 mas/yr[3]
Parallax (π)12.4367 ± 0.0357 mas[3]
Distance262.3 ± 0.8 ly
(80.4 ± 0.2 pc)
Absolute magnitude (MV)+1.91[7]
Details
Mass1.82±0.07[8] M☉
Radius1.77±0.09[9] R☉
Luminosity13.67[10] L☉
Surface gravity (log g)4.28±0.07[11] cgs
Temperature8,466±125[11] K
Metallicity [Fe/H]−0.20[12] dex
Rotation42.9 min[2]
Other designations
11 G. Volantis[13], CD−71°402, CPD−71°574, GC 9967, HD 59640, HIP 35946, SAO 256408[14]
Database references
SIMBADdata

This is an ordinary A-type main-sequence star with a stellar classification of A3 V. It has 1.82 times the mass of the Sun[8] and 1.77 times its radius.[9] It radiates 13.7 times the luminosity of the Sun[10] from its photosphere at an effective temperature of 8,466 K.[11] HD 59640 has an iron abundance 63% that of the Sun,[12] making it metal deficient. In 2020, Maximillian N. Günther and colleagues found the object to be an eruptive variable star with flares lasting up to 10 minutes. However, they are rather small, with the maximum being only two hundredths of a magnitude.[2]

References

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  1. ^ "MAST: Barbara A. Mikulski Archive for Space Telescopes". Space Telescope Science Institute. Retrieved 27 September 2024.
  2. ^ a b c d Günther, Maximilian N.; Zhan, Zhuchang; Seager, Sara; Rimmer, Paul B.; Ranjan, Sukrit; Stassun, Keivan G.; Oelkers, Ryan J.; Daylan, Tansu; Newton, Elisabeth; Kristiansen, Martti H.; Olah, Katalin; Gillen, Edward; Rappaport, Saul; Ricker, George R.; Vanderspek, Roland K.; Latham, David W.; Winn, Joshua N.; Jenkins, Jon M.; Glidden, Ana; Fausnaugh, Michael; Levine, Alan M.; Dittmann, Jason A.; Quinn, Samuel N.; Krishnamurthy, Akshata; Ting, Eric B. (20 January 2020). "Stellar Flares from the First TESS Data Release: Exploring a New Sample of M Dwarfs". The Astronomical Journal. 159 (2): 60. arXiv:1901.00443. Bibcode:2020AJ....159...60G. doi:10.3847/1538-3881/ab5d3a. eISSN 1538-3881.
  3. ^ a b c d e f g 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.
  4. ^ a b 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.
  5. ^ Houk, N.; Cowley, A. P. (1975). University of Michigan Catalogue of two-dimensional spectral types for the HD stars. Volume I. Declinations −90° to −53°. Bibcode:1975mcts.book.....H.
  6. ^ a b Moreno, H.; Carrasco, G. (July 1986). "UBVRI photometry of FK4 and FK4 supplement stars". Astronomy and Astrophysics Supplement Series. 65: 33–39. Bibcode:1986A&AS...65...33M. ISSN 0365-0138.
  7. ^ 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 Allende Prieto, C.; Lambert, D. L. (December 1999). "Fundamental parameters of nearby stars from the comparison with evolutionary calculations: masses, radii and effective temperatures". Astronomy and Astrophysics. 352: 555–562. arXiv:astro-ph/9911002. Bibcode:1999A&A...352..555A. ISSN 0004-6361.
  9. ^ a b 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.
  10. ^ a b McDonald, I.; Zijlstra, A. A.; Boyer, M. L. (21 November 2012). "Fundamental parameters and infrared excesses of Hipparcos stars: Parameters and IR excesses from Hipparcos". Monthly Notices of the Royal Astronomical Society. 427 (1): 343–357. arXiv:1208.2037. Bibcode:2012MNRAS.427..343M. doi:10.1111/j.1365-2966.2012.21873.x. eISSN 1365-2966. ISSN 0035-8711.
  11. ^ a b c 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.
  12. ^ a b Anders, F.; et al. (February 2022). "Photo-astrometric distances, extinctions, and astrophysical parameters for Gaia EDR3 stars brighter than G = 18.5". Astronomy & Astrophysics. 658: A91. arXiv:2111.01860. Bibcode:2022A&A...658A..91A. doi:10.1051/0004-6361/202142369. eISSN 1432-0746. ISSN 0004-6361.
  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 59640". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved December 12, 2022.
  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.
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