HD 74423

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HD 74423
HD74423LightCurve.png
A light curve for HD 74423 plotted from TESS data [1]
Observation data
Epoch J2000.0        Equinox J2000.0 (ICRS)
Constellation Volans [2]
Right ascension 08h 40m 17.985s [3]
Declination −64° 50′ 16.84″ [3]
Apparent magnitude  (V)8.58–8.66 [4]
Characteristics
Spectral type A7VkA0mA0 λ Boo [5]
Apparent magnitude  (B)8.81±0.02 [6]
Apparent magnitude  (J)8.065±0.020 [6]
Apparent magnitude  (H)8.021±0.067 [6]
Apparent magnitude  (K)7.944±0.040 [6]
Variable type α2 CVn [4] or Ellipsoidal and δ Sct [7]
Astrometry
Proper motion (μ)RA: −9.719 [3] mas/yr
Dec.: 11.732 [3] mas/yr
Parallax (π)2.1018±0.0150  mas [3]
Distance 1,550 ± 10  ly
(476 ± 3  pc)
Details
primary
Mass 2.1 [8]   M☉
Radius 3.3 [8]   R☉
Surface gravity (log g)3.6 [5]   cgs
Temperature 7,900 [8]   K
Metallicity [Fe/H]−1.0 [5]   dex
secondary
Mass 2.0 [8]   M☉
Radius 3.2 [8]   R☉
Surface gravity (log g)3.6 [5]   cgs
Temperature 7,600 [8]   K
Metallicity [Fe/H]−1.0 [5]   dex
Age 800 [7]   Myr
Other designations
HD  74423, CD−64°342, SAO  250298, TYC  8934-1662-1, TIC  355151781
Database references
SIMBAD data

HD 74423 is a heartbeat binary star and one component pulsates on only one hemisphere. This is caused by tidal interaction with its partner. [7] The star is located in the Volans constellation.

HD 74423 is slightly variable in brightness. It fluctuates between magnitudes 8.58 and 8.66 every 19 hours. [4] The exact variability type is unclear. It was initially found in a search for α2 Canum Venaticorum variables and assumed to be one, but has since been considered to be a δ Scuti variable. [7] The spectrum shows unusually strong absorption lines of some iron peak elements, a characteristic of λ Boötis stars. Both components are thought to show the chemical peculiarity. [7]

References

  1. ↑ "MAST: Barbara A. Mikulski Archive for Space Telescopes". Space Telescope Science Institute. Retrieved 8 December 2021.
  2. ↑ Staff (2 August 2008). "Finding the constellation which contains given sky coordinates". DJM.cc. Retrieved 31 July 2020.
  3. 1 2 3 4 5 Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics . 649: A1. arXiv: 2012.01533 . Bibcode:2021A&A...649A...1G. doi: 10.1051/0004-6361/202039657 . S2CID   227254300. (Erratum:  doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
  4. 1 2 3 Bernhard, K.; Hümmerich, S.; Otero, S.; Paunzen, E. (2015). "A search for photometric variability in magnetic chemically peculiar stars using ASAS-3 data". Astronomy and Astrophysics. 581: A138. arXiv: 1507.01112 . Bibcode:2015A&A...581A.138B. doi:10.1051/0004-6361/201526424. S2CID   54062866.
  5. 1 2 3 4 5 Gray, R. O.; Riggs, Q. S.; Koen, C.; Murphy, S. J.; Newsome, I. M.; Corbally, C. J.; Cheng, K. -P.; Neff, J. E. (2017). "The Discovery of λ Bootis Stars: The Southern Survey I". The Astronomical Journal. 154 (1): 31. Bibcode:2017AJ....154...31G. doi: 10.3847/1538-3881/aa6d5e .
  6. 1 2 3 4 "HD 74423 -- Star". SIMBAD. Centre de Données astronomiques de Strasbourg . Retrieved 31 July 2020.
  7. 1 2 3 4 5 Handler, G.; Kurtz, D. W.; Rappaport, S. A.; Saio, H.; Fuller, J.; Jones, D.; Guo, Z.; Chowdhury, S.; Sowicka, P.; Aliçavuş, F. Kahraman; Streamer, M. (9 March 2020). "Tidally trapped pulsations in a close binary star system discovered by TESS". Nature Astronomy. 4 (7): 684–689. arXiv: 2003.04071 . Bibcode:2020NatAs...4..684H. doi:10.1038/s41550-020-1035-1. ISSN   2397-3366. S2CID   212634328.
  8. 1 2 3 4 5 6 Fuller, J.; Kurtz, D. W.; Handler, G.; Rappaport, S. (2020). "Tidally trapped pulsations in binary stars". Monthly Notices of the Royal Astronomical Society. 498 (4): 5730. arXiv: 2008.02836 . Bibcode:2020MNRAS.498.5730F. doi: 10.1093/mnras/staa2376 .
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