Astronomy:HD 59640

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

HD 59640 is a solitary white hued star located in the southern circumpolar constellation Volans. It has an apparent magnitude of 6.48,[2] placing it near the limit for naked eye visibility. Gaia DR3 parallax measurements place the object at a distance of 262 light years[1] and it is receding with a heliocentric radial velocity of 18.4 km/s.[1] At its current distance, HD 59640's brightness is diminished by three tenths of a magnitude due to interstellar dust.[13]

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[7] and 1.77 times its radius.[8] It radiates 13.7 times the luminosity of the Sun[9] from its photosphere at an effective temperature of 8,466 K.[10] HD 59640 has an iron abundance 63% that of the Sun,[11] 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.[5]

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940  Gaia DR3 record for this source at VizieR.
  2. ↑ 2.0 2.1 Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P. et al. (March 2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics 355: L27–L30. ISSN 0004-6361. Bibcode: 2000A&A...355L..27H. 
  3. ↑ 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. 
  4. ↑ 4.0 4.1 Moreno, H.; Carrasco, G. (July 1986). "UBVRI photometry of FK4 and FK4 supplement stars.". Astronomy and Astrophysics Supplement Series 65: 33–39. ISSN 0365-0138. Bibcode: 1986A&AS...65...33M. 
  5. ↑ 5.0 5.1 5.2 Günther, Maximilian N.; Zhan, Zhuchang; Seager, Sara; Rimmer, Paul B.; Ranjan, Sukrit; Stassun, Keivan G.; Oelkers, Ryan J.; Daylan, Tansu et al. (20 January 2020). "Stellar Flares from the First TESS Data Release: Exploring a New Sample of M Dwarfs". The Astronomical Journal 159 (2): 60. doi:10.3847/1538-3881/ab5d3a. Bibcode: 2020AJ....159...60G. 
  6. ↑ Anderson, E.; Francis, Ch. (May 2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331–346. doi:10.1134/S1063773712050015. ISSN 1063-7737. Bibcode: 2012AstL...38..331A. 
  7. ↑ 7.0 7.1 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. ISSN 0004-6361. Bibcode: 1999A&A...352..555A. 
  8. ↑ 8.0 8.1 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. doi:10.1051/0004-6361:20035930. ISSN 0004-6361. Bibcode: 2004A&A...426..297K. 
  9. ↑ 9.0 9.1 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. doi:10.1111/j.1365-2966.2012.21873.x. ISSN 0035-8711. Bibcode: 2012MNRAS.427..343M. 
  10. ↑ 10.0 10.1 10.2 Stassun, Keivan G. et al. (9 September 2019). "The Revised TESS Input Catalog and Candidate Target List". The Astronomical Journal 158 (4): 138. doi:10.3847/1538-3881/ab3467. Bibcode: 2019AJ....158..138S. 
  11. ↑ 11.0 11.1 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. doi:10.1051/0004-6361/202142369. ISSN 0004-6361. Bibcode: 2022A&A...658A..91A. 
  12. ↑ "HD 59640". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+59640. 
  13. ↑ 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. doi:10.1093/mnras/stx2219. ISSN 0035-8711. Bibcode: 2017MNRAS.472.3805G. 
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