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For other star systems with this Bayer designation, see Tau Eridani.
τ4 Eridani
Location of τ4 Eridani (circled)
Observation data
Epoch J2000.0       Equinox J2000.0 ( ICRS)
Constellation Eridanus
Right ascension 03h 19m 31.0006s [1]
Declination −21° 45′ 28.315″ [1]
Apparent magnitude (V) 3.65 [2]
Characteristics
Evolutionary stage asymptotic giant branch [3]
Spectral type M3/4 III [4]
U−B color index +1.79 [2]
B−V color index +1.61 [2]
Variable type Lb [5]
Astrometry
Radial velocity (Rv)+41.7±0.7 [6] km/s
Proper motion (μ) RA: +52.774  mas/ yr [1]
Dec.: +32.718  mas/ yr [1]
Parallax (π)10.6153 ± 0.3213  mas [1]
Distance307 ± 9  ly
(94 ± 3  pc)
Absolute magnitude (MV)−0.79 [7]
Details
Mass1.95 [8]  M☉
Radius103 [9]  R☉
Luminosity1,537 [10]  L☉
Surface gravity (log g)0.91 [8]  cgs
Temperature3,770 [8]  K
Other designations
τ4 Eridani, τ4 Eri, 16 Eridani, BD-22° 584, HD 20720, HIP 15474, HR 1003, SAO 168460. [11]
Database references
SIMBAD data

Tau4 Eridani (τ4 Eridani, τ4 Eri) is a binary star system in the constellation Eridanus. It is visible to the naked eye with an apparent visual magnitude of 3.65. [2] The distance to this star can be estimated using the parallax method, which yields a value of roughly 300  light years. [1]

A visual band light curve for Tau4 Eridani, plotted from data published by Tabur et al. (2009) [12]

This is an evolved red giant star currently on the asymptotic giant branch [3] with a stellar classification of M3/4 III. [4] It is a slow irregular variable star of type Lb, undergoing changes in magnitude over the range 3.57−3.72 [5] with a periodicity of 23.8 d. [12] The measured angular diameter of Tau4 Eridani is 10.58±1.00  mas. [13] At its estimated distance, this yields a physical size of about 106 times the radius of the Sun. [14] It shines with 1,537 [10] times the luminosity of the Sun from an outer atmosphere at an effective temperature of 3,770 K. [8]

This is most likely a binary star system. [15] The companion is a magnitude 9.5 star at an angular separation of 5.7 ″ along a position angle of 291°, as of 2013. [16]

References

  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 Mermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)", Catalogue of Eggen's UBV Data, SIMBAD, Bibcode: 1986EgUBV........0M.
  3. ^ a b Lebzelter, T.; Hron, J. (January 2008), "BRITE stars on the AGB" (PDF), Communications in Asteroseismology, 152: 178–181, Bibcode: 2008CoAst.152..178L, doi: 10.1553/cia152s178.
  4. ^ a b Houk, N.; Smith-Moore, M. (1988), Michigan Catalogue of Two-dimensional Spectral Types for the HD Stars, vol. 4, Bibcode: 1988mcts.book.....H.
  5. ^ a b Ruban, E. V.; et al. (September 2006), "Spectrophotometric observations of variable stars", Astronomy Letters, 32 (9): 604–607, Bibcode: 2006AstL...32..604R, doi: 10.1134/S1063773706090052, S2CID  121747360.
  6. ^ 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, S2CID  119231169.
  7. ^ Cardini, D. (January 2005), "Mg II chromospheric radiative loss rates in cool active and quiet stars", Astronomy and Astrophysics, 430: 303–311, arXiv: astro-ph/0409683, Bibcode: 2005A&A...430..303C, doi: 10.1051/0004-6361:20041440, S2CID  12136256.
  8. ^ a b c d Ayres, Thomas (2023-05-01), "In the Trenches of the Solar-Stellar Connection. VII. Wilson-Bappu 2022", The Astrophysical Journal Supplement Series, 266 (1): 6, Bibcode: 2023ApJS..266....6A, doi: 10.3847/1538-4365/acb535, ISSN  0067-0049 Tau4 Eridani database entry at VizieR.
  9. ^ Wood, Brian E.; Müller, Hans-Reinhard; Harper, Graham M. (2016-09-23), "Hubble Space Telescope Constraints on the Winds and Astrospheres of Red Giant Stars", The Astrophysical Journal, 829 (2): 74, arXiv: 1607.07732, Bibcode: 2016ApJ...829...74W, doi: 10.3847/0004-637X/829/2/74, ISSN  0004-637X
  10. ^ a b McDonald, I.; et al. (2012), "Fundamental Parameters and Infrared Excesses of Hipparcos Stars", Monthly Notices of the Royal Astronomical Society, 427 (1): 343–57, arXiv: 1208.2037, Bibcode: 2012MNRAS.427..343M, doi: 10.1111/j.1365-2966.2012.21873.x, S2CID  118665352.
  11. ^ "tau04 Eri". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2016-10-13.{{ cite web}}: CS1 maint: postscript ( link)
  12. ^ a b Tabur, V.; et al. (December 2009), "Long-term photometry and periods for 261 nearby pulsating M giants", Monthly Notices of the Royal Astronomical Society, 400 (4): 1945–1961, arXiv: 0908.3228, Bibcode: 2009MNRAS.400.1945T, doi: 10.1111/j.1365-2966.2009.15588.x, S2CID  15358380.
  13. ^ Richichi, A.; Percheron, I. (May 2005), "First results from the ESO VLTI calibrators program", Astronomy and Astrophysics, 434 (3): 1201–1209, arXiv: astro-ph/0501532, Bibcode: 2005A&A...434.1201R, doi: 10.1051/0004-6361:20042257, S2CID  2847613.
  14. ^ Lang, Kenneth R. (2006), Astrophysical formulae, Astronomy and astrophysics library, vol. 1 (3 ed.), Birkhäuser, ISBN  3-540-29692-1. The radius (R*) is given by:
  15. ^ Eggleton, P. P.; Tokovinin, A. A. (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, S2CID  14878976.
  16. ^ Mason, B. D.; et al. (2014), "The Washington Visual Double Star Catalog", The Astronomical Journal, 122 (6): 3466–3471, Bibcode: 2001AJ....122.3466M, doi: 10.1086/323920, retrieved 2015-07-22
Retrieved from " https://en.wikipedia.org/?title=Tau4_Eridani&oldid=1235275195"
From Wikipedia, the free encyclopedia
For other star systems with this Bayer designation, see Tau Eridani.
τ4 Eridani
Location of τ4 Eridani (circled)
Observation data
Epoch J2000.0       Equinox J2000.0 ( ICRS)
Constellation Eridanus
Right ascension 03h 19m 31.0006s [1]
Declination −21° 45′ 28.315″ [1]
Apparent magnitude (V) 3.65 [2]
Characteristics
Evolutionary stage asymptotic giant branch [3]
Spectral type M3/4 III [4]
U−B color index +1.79 [2]
B−V color index +1.61 [2]
Variable type Lb [5]
Astrometry
Radial velocity (Rv)+41.7±0.7 [6] km/s
Proper motion (μ) RA: +52.774  mas/ yr [1]
Dec.: +32.718  mas/ yr [1]
Parallax (π)10.6153 ± 0.3213  mas [1]
Distance307 ± 9  ly
(94 ± 3  pc)
Absolute magnitude (MV)−0.79 [7]
Details
Mass1.95 [8]  M☉
Radius103 [9]  R☉
Luminosity1,537 [10]  L☉
Surface gravity (log g)0.91 [8]  cgs
Temperature3,770 [8]  K
Other designations
τ4 Eridani, τ4 Eri, 16 Eridani, BD-22° 584, HD 20720, HIP 15474, HR 1003, SAO 168460. [11]
Database references
SIMBAD data

Tau4 Eridani (τ4 Eridani, τ4 Eri) is a binary star system in the constellation Eridanus. It is visible to the naked eye with an apparent visual magnitude of 3.65. [2] The distance to this star can be estimated using the parallax method, which yields a value of roughly 300  light years. [1]

A visual band light curve for Tau4 Eridani, plotted from data published by Tabur et al. (2009) [12]

This is an evolved red giant star currently on the asymptotic giant branch [3] with a stellar classification of M3/4 III. [4] It is a slow irregular variable star of type Lb, undergoing changes in magnitude over the range 3.57−3.72 [5] with a periodicity of 23.8 d. [12] The measured angular diameter of Tau4 Eridani is 10.58±1.00  mas. [13] At its estimated distance, this yields a physical size of about 106 times the radius of the Sun. [14] It shines with 1,537 [10] times the luminosity of the Sun from an outer atmosphere at an effective temperature of 3,770 K. [8]

This is most likely a binary star system. [15] The companion is a magnitude 9.5 star at an angular separation of 5.7 ″ along a position angle of 291°, as of 2013. [16]

References

  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 Mermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)", Catalogue of Eggen's UBV Data, SIMBAD, Bibcode: 1986EgUBV........0M.
  3. ^ a b Lebzelter, T.; Hron, J. (January 2008), "BRITE stars on the AGB" (PDF), Communications in Asteroseismology, 152: 178–181, Bibcode: 2008CoAst.152..178L, doi: 10.1553/cia152s178.
  4. ^ a b Houk, N.; Smith-Moore, M. (1988), Michigan Catalogue of Two-dimensional Spectral Types for the HD Stars, vol. 4, Bibcode: 1988mcts.book.....H.
  5. ^ a b Ruban, E. V.; et al. (September 2006), "Spectrophotometric observations of variable stars", Astronomy Letters, 32 (9): 604–607, Bibcode: 2006AstL...32..604R, doi: 10.1134/S1063773706090052, S2CID  121747360.
  6. ^ 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, S2CID  119231169.
  7. ^ Cardini, D. (January 2005), "Mg II chromospheric radiative loss rates in cool active and quiet stars", Astronomy and Astrophysics, 430: 303–311, arXiv: astro-ph/0409683, Bibcode: 2005A&A...430..303C, doi: 10.1051/0004-6361:20041440, S2CID  12136256.
  8. ^ a b c d Ayres, Thomas (2023-05-01), "In the Trenches of the Solar-Stellar Connection. VII. Wilson-Bappu 2022", The Astrophysical Journal Supplement Series, 266 (1): 6, Bibcode: 2023ApJS..266....6A, doi: 10.3847/1538-4365/acb535, ISSN  0067-0049 Tau4 Eridani database entry at VizieR.
  9. ^ Wood, Brian E.; Müller, Hans-Reinhard; Harper, Graham M. (2016-09-23), "Hubble Space Telescope Constraints on the Winds and Astrospheres of Red Giant Stars", The Astrophysical Journal, 829 (2): 74, arXiv: 1607.07732, Bibcode: 2016ApJ...829...74W, doi: 10.3847/0004-637X/829/2/74, ISSN  0004-637X
  10. ^ a b McDonald, I.; et al. (2012), "Fundamental Parameters and Infrared Excesses of Hipparcos Stars", Monthly Notices of the Royal Astronomical Society, 427 (1): 343–57, arXiv: 1208.2037, Bibcode: 2012MNRAS.427..343M, doi: 10.1111/j.1365-2966.2012.21873.x, S2CID  118665352.
  11. ^ "tau04 Eri". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2016-10-13.{{ cite web}}: CS1 maint: postscript ( link)
  12. ^ a b Tabur, V.; et al. (December 2009), "Long-term photometry and periods for 261 nearby pulsating M giants", Monthly Notices of the Royal Astronomical Society, 400 (4): 1945–1961, arXiv: 0908.3228, Bibcode: 2009MNRAS.400.1945T, doi: 10.1111/j.1365-2966.2009.15588.x, S2CID  15358380.
  13. ^ Richichi, A.; Percheron, I. (May 2005), "First results from the ESO VLTI calibrators program", Astronomy and Astrophysics, 434 (3): 1201–1209, arXiv: astro-ph/0501532, Bibcode: 2005A&A...434.1201R, doi: 10.1051/0004-6361:20042257, S2CID  2847613.
  14. ^ Lang, Kenneth R. (2006), Astrophysical formulae, Astronomy and astrophysics library, vol. 1 (3 ed.), Birkhäuser, ISBN  3-540-29692-1. The radius (R*) is given by:
  15. ^ Eggleton, P. P.; Tokovinin, A. A. (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, S2CID  14878976.
  16. ^ Mason, B. D.; et al. (2014), "The Washington Visual Double Star Catalog", The Astronomical Journal, 122 (6): 3466–3471, Bibcode: 2001AJ....122.3466M, doi: 10.1086/323920, retrieved 2015-07-22
Retrieved from " https://en.wikipedia.org/?title=Tau4_Eridani&oldid=1235275195"

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